Source: https://patents.google.com/patent/TWI378516B/en
Timestamp: 2019-12-15 23:30:31
Document Index: 225331368

Matched Legal Cases: ['art 347', 'art 11', 'art 244', 'art 347', 'art 97424', 'Application No. 093']

TWI378516B - Bump-on-lead flip chip interconnection - Google Patents
TWI378516B
TWI378516B TW093134366A TW93134366A TWI378516B TW I378516 B TWI378516 B TW I378516B TW 093134366 A TW093134366 A TW 093134366A TW 93134366 A TW93134366 A TW 93134366A TW I378516 B TWI378516 B TW I378516B
TW093134366A
TW200525666A (en
Rajendra D Pendese
2005-08-01 Publication of TW200525666A publication Critical patent/TW200525666A/en
2012-12-01 Publication of TWI378516B publication Critical patent/TWI378516B/en
1378516 IX. Description of the invention: [Technical field to which the invention pertains] The present invention has a material-conductor package, in particular, a wafer-interconnect. [Prior Art] A flip chip package (4) is a semiconductor die on a package substrate, and a side of the die acts on the substrate. Conventionally, a die can be formed by bumps bonded to an array of interconnects of die and to corresponding (complementary) arrays of interconnected pads (commonly referred to as "capture pads") soldered to the substrate. Interconnection of circuits in the middle circuit and the I board. &amp; The areal density of electronic features on integrated circuits has increased significantly, and wafers with larger circuit feature densities also have larger densities for locations interconnected with package substrates. The package is connected to the bottom circuit, such as a printed circuit board (e.g., "master board"), in a device employing the package by a second-order interconnection (such as a pin) between the package and the bottom circuit. The second-order interconnects have a larger pitch than the flip-chip interconnects, so the wiring on the substrate is conventionally fanned out. Significant technological developments have been able to construct fine lines and spaces; however, in conventional configurations, the spacing between adjacent pads limits the number of wires rather than avoiding more inwardly-captured solder bumps in the array. A fan-shaped wiring is formed between the capture pads under the die and the external pins of the package on the plurality of metal layers in the package substrate. For complex interconnect arrays, it may be necessary to use a multi-layer substrate to achieve wiring between the die pad on the package and the second-order interconnect. Multilayer substrates are expensive, and in conventional flip chip designs, typically 97424.doc 1378516 is the substrate that accounts for more than half of the package cost (in some typical examples t, about 60%). The high cost of multi-layer substrates has been a factor limiting the development of flip-chip technology for mainstream products. In the conventional flip chip concept, the escaping wiring pattern typically causes additional electrical parasitics because the wiring includes short-range unshielded lines and channels between the circuit layers of the signal transmission path. Electrical parasitics will significantly limit the effectiveness of the package. SUMMARY OF THE INVENTION According to the present invention, a flip chip interconnect can be completed by directly connecting interconnect bumps to leads instead of to pads. The present invention provides more efficient wiring on the substrate. In particular, signal wiring can be formed entirely in a single metal layer of the substrate. This reduces the number of layers in the substrate, and the formation of wiring in a single layer also eliminates the channel, line, and spacing design rules that must be met by some substrates. This substrate simplification greatly reduces the total cost of the flip chip package. The on-lead &amp; block architecture also helps to eliminate substrate design such as channels and "stubs" and enables the impedance of the microstrip controlled by the signal transmission, thereby greatly improving performance. In one general aspect, the present invention has a flip chip interconnect having a solder bump bonded to an interconnect pad on a die i and conjugated to a corresponding wire on the substrate. In another general aspect The present invention has a flip chip package comprising: - a die having a solder bump adhered to the interconnect pad in the active surface and a substrate - having in the die pulling surface Conductive wiring where the *Hai bumps are directly sprayed onto the wiring. 97424.doc 1378516
Interconnecting, and solder solder interconnect geometry, in some embodiments, further providing the substrate a solder mask,
a plurality of curable adhesives on the substrate (covering at least the connection locations on the wires) or on the active side of the die (covering at least the bumps); placing the die to direct the active side of the die a die attach surface of the substrate, and aligning the die and the substrate and then moving one of the other to the other such that the bumps contact the corresponding wires (leads) on the substrate; applying a force to the convex a block press on the mating wires sufficient to replace the adhesive between the bumps and the mating wires; at least partially curing the adhesive; melting and then resolidifying the solder to be between the bumps and the wires Form a metallurgical interconnect. In another general aspect, the invention has a method for forming a flip chip interconnect by: providing a substrate having: a wiring formed in a die attach surface, an interconnection at the lead a strip of material having an opening at a position, and a die having a bump on the surface of the interconnecting pad 97742.doc 1378516; fixing the substrate and the die; placing the die, The working side of the die faces the die attach surface of the substrate, and the die and the substrate are aligned and then moved to the other, such that the bumps contact the corresponding wires (leads) on the substrate; Melting then re-solidifying to form a metallurgical interconnect between the bump and the wire. In some embodiments, the solder bump includes a flattenable solder portion, and the melting and solidifying step can then melt the bump to form an interconnect on the lead. In some embodiments, further providing a solder paste on the bow line of the substrate, and moving the die and the substrate toward each other may form between the bumps on the lead and the solder A contact, then melting and solidification step can melt the solder on the leads to form an interconnect. In another general aspect, the present invention has a method for forming a flip chip interconnect by: providing a substrate having: a wiring formed in a die attach surface, at which the leads are inter a solder mask having an opening at the position, a solder paste on the lead at the interconnection location, and a die having a &amp; block bonded to the interconnected pad in the active surface; fixing the substrate and the a die; placing the die, facing the active side of the die toward the die attach surface of the substrate, and aligning the die and the substrate and then moving the one of the die to the other Solder paste on the corresponding wires (leads) on the substrate; melting and then re-solidifying the solder paste to form a metallurgical interconnect between the bumps and the wires. [Embodiment] The present invention will now be described with reference to the circular progressive sheep and the field description of the present invention instead of the specific embodiment. The drawings are schematic diagrams showing the features of the present invention and its relationship with its 97424.doc 1378516, which clearly shows that the relationship between the features and the structure of all the drawings in the other figures is not drawn to scale. It is to be understood that all of the elements of the ten-element of the embodiment of the invention are not specifically relabeled and may not be quickly identified. Conventional flip chip interconnects use 15 (as is customary, bump bumps) junctions, to "clamp the bumps, so this can be called "capture on the mat! / mat (four) matte surface, gold bumps" (" B〇Cj) There are two distinct features in the mutual bismuth: ―, need to use the comparison called nr to match the bumps on the die; second, you need to use the usual: 'mask' insulation material to interconnect The solder is restricted during the program. The solder mask opening can be defined as the outline of the glazed tantalum that captures the solder bump ("solder mask defined"), or the solder wheel temple cannot be defined by the mask opening ("non-tamper mask definition") ), 1 A case is shown in the example of Figure 1 - detailed below; the solder mask opening σ can be significantly larger than the capture pad. The technique used to define the solder mask opening has a wide tolerance range. Therefore, for the solder mask 胄U bump configuration, the capture pad must be large (usually much larger than the design size of the mask σ) to ensure that the mask opening can be placed on the spray surface of the pad; For bump configurations defined by non-solder masks, the solder mask opening must be larger than the capture pad. The width of the capture pad (the diameter of the round pad) is usually about the same diameter as the ball (or bump) and can be two to four times wider than the width of the wire. This can cause many of the wiring spacing to be lost to the top substrate layer. In particular, for example, the "diffused wiring pitch" is much larger than the finest wiring pitch that the substrate technology can provide. This means that a large number of pads must be routed through the short vias and vias on the underlying substrate layer by short vias and vias to radiate from the pads discussed. 1 and 2 are cross-sectional views showing a portion of a conventional flip chip package; FIG. 1 is a partial cross-sectional view taken along line of FIG. 2 and parallel to the surface of the package substrate; and FIG. 2 is a partial cross-sectional view of FIG. Along the line "I intercepts and encloses the plane perpendicular to the surface of the substrate. The specific features are displayed as transparent. Many of the features in Figure 1 are at least partially covered by the features of the overlay... see the reference picture! and Figure 2, The die attach surface of the substrate comprises a metal or a thin layer formed on the dielectric layer 12. The metal layer is patterned to form the lead 13 and the solder bump 14. The insulating layer is also referred to as "solder masking". The cover can cover the die attach surface of the substrate; the solder mask is typically constructed of a photodefinable material and patterned by conventional photoresist patterning techniques to expose the surface of the captured solder bump 14 (4). The interconnecting bumps 15 adhered to the die-closed solder bumps can be bonded to the slab surface of the substrate corresponding to the capture itch pad to form an appropriate electrical interaction between the circuitry on the die and the leads on the substrate. After the remelting material is cooled to establish an electrical connection, (4) full material Liao is introduced into the gap between the grain μ and the substrate m to mechanically interconnect and protect the features between the die and the substrate. By way of example, the signal dissipation wiring in the metal layer above the substrate (lead 13) is shown, guided from its individual capture pads 14 across the edge of the die, as indicated by the dashed line 11, and exiting the die coverage area. In a typical example The signal wiring can have a dissipation pitch of PWq 112 um. The design rule of 3〇um/3〇um is usually used for the wiring itself in the configuration shown in Figure 1; that is, the wiring standard is called 30 um wide, and its spacing A similar 3 um capture pad is typically larger than: the line width is three times, so in this example, the capture pad has a nominal width of 97424.doc -10- 1378516 (d) (or in this example 'if about _, Is the diameter.) Also, in this example, the solder mask The opening is larger than the material and has a nominal width (diameter) of 135 um. Figure (1) shows the solder rim defined by the non-solder mask. As the glazed material of the bumps on the die simplifies, the molten tan tends to The "wet" leads and the metal that captures the solder, and the solder tend to "run out" on any uncovered continuous metal surface. The solder tends to flow along the continuous leads 13, and the flow of the solder therein is limited by the solder scale (Fig. 4). The tanned profile defined by the non-solder mask on the pad is clearly visible in Figure 2, wherein the bump (4) material is shown as 29 flowing on the side of the capture pad 14 and down to the surface of the dielectric layer of the substrate 12. This escaping "#咕回化" is defined as a rim defined by a non-solder mask" because the material does not limit the flow of solder on the surface and down to the side of the captured solder joint unless Tan material, the flow of No will be limited by the fact that the dielectric surface of the substrate will not be consumed by the material. In the conventional configuration shown in Figure (5), the lower limit of the density of the trapping pad is The following factors, =, limit the ability of the mask forming technique to create a reliable narrow mask: and the need to provide a mask structure between adjacent mask openings. In addition to the Si, the lower limit of the dissipation density is additionally determined by the need to focus more on the collection of the itch line of the itch line between the capture pads. More peripherals Figure 3 U and Figure 2 have the same cross-section circles showing the contours of the conventional materials. The 曰(4) shown 丄 计 遮 遮 遮 合 合 合 合 合 合 合 合 合 附加 附加 附加 附加 附加 附加 附加 附加 附加 附加 附加 974 974 974 974 974 974 974 974 974 974 974 974 974 974 974 974 974 974 974 974 974 974 974 974 The layer 'is and the wiring (3) line 33) _ to form the capture (four). After the refining material is cooled to establish an electrical connection, the side fill material is introduced into the grain-like substrate 12 to mechanically stabilize each other. The features of the die and the substrate are protected and protected. The capture pad 34 here is wider than the examples in Figures 2 and 2, and the opening of the glow mask is smaller than that of the trap, so the floating mask can cover each Capture the side and part of the indwelling surface of the itch pad (such as 39) and the lead 33. After the bump 35 is brought into contact with the salivating surface of the individual trapping pads, and then melted, the smashing mask material is removed. 39 can limit the melting
The movement of the solder, so the shape of the solder wheel mill can be defined by the shape and size of the mask opening that captures the solder bump W. According to a specific embodiment of the present invention, a partial wear image taken from a plane parallel to the surface of the substrate along the cross-sectional views Γ·4 and 6-6' is shown as a step-by-step y y fang, Mounting the bumps on the leads of the interconnects ("BOL" parts are displayed as specific features. According to the invention, the bumps are directly on the individual narrow leads or wires on the board. It is called "on-lead bump" ("job") interconnection. These specific embodiments of the solder invention, and according to the process, can be completed without using a mask. 枓 枓 。. The following is the function of the flow of the melted tan. Figure 4 is a straight line 5 5, 哉 &quot; a partial cross-section of the package of 4, which is taken along line 5-5 and taken from the local η flat ' of the package. Plane; and take and seal... It is a plane perpendicular to the plane of the surface of the substrate along line 7-7 of Figure 6. Figures 4 and 6 show examples of bumps on the leads 97742.doc according to the present invention. 1378516 ("B〇L") Dissipative Wiring Pattern for Substrate: In Figure 4, it is configured for die bonding of interconnecting balls thereon. The crystal grains arranged in a line around the periphery of the die are aligned in a row of dissipation wires 43 near the edge of the grain coverage area, and the bumps 45 are engaged to the corresponding interconnection positions as shown by the dashed line; Wherein, the dies for the array of die attach pads thereon in a parallel column near the die will ring the bumps 65 to the dissipative wires 63 of the complementary array near the edge of the die footprint The corresponding interconnection locations, as indicated by the dashed lines, are shown in Figures 4 and 6. The wiring density achievable with the bump-on-lead interconnects according to the present invention can be equal to the finest wiring pitch provided by the substrate technology. In the particular case shown, this may constitute about 9% higher than the wiring density achieved by the conventional bump-on-bump configuration. In the surrounding embodiment (see Figure 4), the fine pitch is placed. The bumps, the pitch is equal to the finest wiring pitch of the substrate. This configuration poses a challenge to the assembly process because the pitch of the bump formation and soldering must be very fine. In the surrounding array form (Figure 6), the bump will be convex. Block matching On the array of regions, the larger bump formation and the solder pitch provide greater spacing and thus can meet the technical challenges of the assembly process. Even in the array embodiment, the wiring on the substrate is the same as the surrounding column configuration. According to the same effective interval, the configuration of Fig. 6 does not sacrifice the fine dissipative wiring pitch, which can meet the responsibility of fine pitch bump formation and soldering. Now, please refer to Figs. 4 and 5, respectively, in the substrate dielectric layer Adhesive Table: Upper 'by patterning a metal layer to form leads 43. According to the present invention, the bumps 45 on the bismuth grains are directly bonded to the leads 43, thereby forming a grain material 97424.doc • 13· 1378516 Electrical interconnection. According to the present invention, it is not necessary to use a capture pad, and in the embodiment of Figures 4 and 5, a solder mask is not required; this procedure is described below. The width (diameter) of the capture pad used for S is usually the same as that of the bump, and is two to four times wider than the width of the wire or the wire. As you know, there are some variations in the width of the lead. As used herein, a wiring width variation of up to a nominal i 2〇% of the wiring width or the wiring design regular width does not constitute a capture pad, and the on-lead bump interconnection according to the present invention includes formation on such a wider portion of the lead. Bumps. Referring also to Figures 6 and 7, the leads 63 can be formed by patterning a metal layer on the die attach surface of the substrate dielectric layer. The signal dissipation wiring will be directed across the edge of the die, as indicated by the dashed line 61, and exit the die coverage area. In accordance with the present invention, the bumps 65 on the die are bonded directly to the leads 63 to be electrically interconnected into the die. The particular dissipation wiring, such as 66, that leads from the edge of the die to the interior of the die footprint from the array of interconnect locations will pass between the bumps of the outer peripheral column of the interconnect location. According to the present invention, There is no need to use a capture pad, and in the specific yoke example of Figures 6 and 7, there is no need to use a solder mask; this procedure is described in detail below. As shown in Figures 4 and 6, the lead is in accordance with the present invention. The bump interconnects can provide significantly higher signal wiring dissipation wiring densities. Also, the B〇L interconnects not according to this aspect of the present invention as shown in Figures 4 and 6 do not require the use of solder masks to define interconnect locations. Solder Profiles The B〇L interconnect structures of the specific embodiments illustrated in Figures 4, 5, 6 and 7 can be produced in accordance with any of several methods of the present invention and do not require 97424.doc • 14- 1378516 is covered with a solder. In general, interconnect bumps (usually solder bumps) are attached to the interconnect pads on the active side of the die. The die attach surface of the substrate (referred to as the "upper" surface) has Patterning the upper metal layer to the specific grain Provided as necessary and bump interconnect wiring configuration. Since the capture pads are not required, the patterned wiring (leads) need only be wired through the locations on the die that complement the pattern of the bump arrangement. An encapsulating resin adhesive is employed in the preferred method of the invention to limit the flow of solder during the melting phase of the interconnect process. Figures 8 and 9 show two examples of portions of a flip chip interconnect of a bump on a lead, taken in a cross-sectional view taken from a plane parallel to the surface of the substrate, in accordance with another embodiment of the present invention. Specific features appear to be transparent. In accordance with this aspect of the invention, a solder mask is provided having a nominal mask opening diameter of between about (four) and 90 um. This spacing solves the solder mask material, and in particular, it is possible to manufacture a substrate having a solder mask having a 9 〇 opening and an alignment tolerance of 25 um in a relatively inexpensive manner. In some embodiments, a laminate substrate (e.g., four metal laminates) fabricated in accordance with standard design rules may be used. For example, in the specific embodiments of FIGS. 8 and 9, the spacing of the wires may be ～90 11111 and the area array of interconnect locations may be &quot;Ο Um to provide an edge across the grain footprint (eg, dashed line 81) Effective)
Full; can be filled with conventional capillary side. 'On the wire 83 of the die attach surface of the substrate 82, the bump is directly engaged
On the dielectric layer, the narrow lead wire or the wiring 83 on the 97424.doc ^/«516 interconnection position 84 can be achieved in the mutual n and no material, and the bar material can be used to limit the glow in the mask. Flow within the limits of σ 88 to prevent solder from flowing away from the interconnected locations along the solder wettable leads. This (4) can also be restricted (4) in (4) ^ (4), or this can be done during the assembly process. In the case of Fig. 9, it is as shown in Fig. 8. According to the present invention, there is no interconnection. On the surface of the substrate 92 where the crystal grains are spotted, a narrow lead or wire 93 on the dielectric layer is patterned. Solder paste is provided at interconnect location 94 on lead 93 to provide a soluble medium for interconnection. The opening 98 of the solder mask can be used to define the solder paste. Solder f can be applied by, for example, standard printing procedures, then returned, and then cast as needed to provide a uniform surface for the mating ball. As described above with reference to Fig. 8, a solder paste may be applied during the assembly of the substrate; or a substrate having a suitably patterned solder paste may be provided prior to assembly. Other methods of selectively applying solder to the interconnect locations can be used for lead soldering, including electroless ore and electroplating techniques, in accordance with embodiments of the present invention. The solder configuration on the leads provides additional solder for interconnects, thus providing higher product yields and higher crystals. Therefore, in some embodiments, the on-lead solder core according to the present invention can be used for die and organic substrates having solder bumps toward refining temperature (such as high-lead solder, conventionally used for interconnection of (four) german substrates). Interconnection. A solder paste having a melting temperature low enough to prevent the organic substrate from being damaged during the reflow can be selected. In order to form an interconnect in such a specific embodiment, the high-melting interconnect bumps and the solder on the leads are brought into contact' and re-melted to bond the leads 97424.doc - 6 - 1 / / 8516 to 6 Piece. When used with the lead itch program, it is not necessary to apply a dot beforehand, because the fact that each interconnect has only a small amount of solder can limit the replacement or flow of the solder, so the non-dustable flat bump can be used. Prevent the assembly from escaping. In other embodiments, the on-line solder configuration according to the present invention (4) can be used for interconnections of dies having eutectic solder bumps. A specific embodiment of a preferred method of forming a bump interconnection on a lead is shown in Figures 10A through 10C. Referring to the drawings, a substrate 112 having at least a dielectric layer and a metal layer on the die attach surface 113 can be provided. The metal layer can be patterned to provide circuitry, particularly where the wires or leads 114 are used on the die attach surface. In the location of the interconnection. The substrate 112 is attached to the carrier or platform 116 with the substrate surface facing the die attach surface 3 facing the solid body. A plurality of encapsulating resins 122 are applied to the die attach surface 113 of the substrate to cover at least the interconnect locations on the leads 114. On the active side 1 〇 3, a die 1 〇 2 having bumps 104 adhered to a die pad (not shown) is provided. The bump includes a soluble material that can contact the mating surface of the lead. The pick and place tool includes a collet 106' which picks up the die by contacting the collet 1〇6 with the back side 〇1 of the die. With the pick-up tool, the die can be placed facing the substrate, wherein the active side of the die faces the die attach surface of the substrate as shown in FIG. A; and the die and the substrate are aligned with each other (arrow M ), causing the bumps 1 〇 4 to contact corresponding interconnect locations on the wires (leads) 114 of the substrate. Then, a force (arrow F) is applied to press the bump 105 against the engaging surface 134 of the interconnecting position on the lead 115 as shown in Fig. 10B. This force must be sufficient to at least replace the interconnect position on the lead 丨丨 4 • 17 隹 97424.doc 1378516 The bump and the adhesive 122 between the mating surfaces. The bumps are thus deformed by force such that the contact surface of the bumps and/or the oxide film on the meshing surface of the leads break. The deformation of the a block causes the fusible material of the bump to press against the top and edges of the lead. The adhesive can be cured to the portion, as shown by 132, by heating to a selected temperature. At this stage, the adhesive only needs to be partially cured, i.e., as long as it reaches a level that is substantially sufficient to prevent molten solder from flowing along the interface between the adhesive and the conductive wiring. The fusible material of the bump 105 is then melted and then re-solidified to form a metallurgical interconnect between the bump 〇5 and the lead 115, thereby completing the adhesive curing to complete the die adhesion and secure the mating surface (now The electrical interconnections for the interconnect interface 144 are summarized as shown at 140 in Figure 10C. In the plane of the cross-sectional view shown in Fig. 1c, an interconnection is formed between the specific bumps 145 and the corresponding interconnection locations on the particular leads 155, as shown in the configuration of FIG. Other leads 156 are interconnected at other locations, which may be seen in other cross-sectional views. The higher wiring density is shown. The curing of the adhesive can be done before, at the same time as or after melting the solder. Typically, the adhesive is a heat curable adhesive, and by adjusting the temperature, the degree of cure at any stage can be controlled in the program. For example, the composition can be heated and cured by raising the temperature of the chuck on the pick-and-place tool or the temperature of the substrate holder. This procedure will be shown in further detail in Figures 11A through iid. In Figure UA, a substrate 212 having conductive (metal) wiring 214 is provided on the die attach surface and the interconnect locations on the wires are covered with an adhesive 222. The position of the die 202 and the relationship of the substrate 212 are such that the side of the die acts on the die attach side of the substrate and its alignment (arrow A) causes the bumps 2 〇 4 and 19742.doc -18- on the die. 1378516 The corresponding mating surfaces on line 214 are aligned. The die and substrate move toward each other, causing the bumps to contact the individual ringing surfaces on the wires. Then, as shown in FIG. 1 1 B, a force is applied to move the block 205 and the wire 215 toward each other instead of the adhesive shown in FIG. 11 232, and then the bump is on the meshing surface 234 and the edge of the wire. Upper deformation. The deformation of the bumps on the wires breaks the contact surface of the bumps and the oxide film on the mating surfaces of the wires to establish a good electrical connection, and the deformation of the bumps on the wire edges helps to establish a good temporary mechanical connection. As in the example of Figures 10A through 10C, the interconnection locations of the particular wiring 216 will deviate from the plane of Figure 11A. It will be heated to partially cure the adhesive as shown by 236 of Figure 1 j c . It is then heated to raise the temperature of the bumps enough to melt the fusible material of the bumps, as shown in Figure 1D. This substantially (but not necessarily completely) completes the curing of the adhesive 246 and, at the interconnecting locations of the leads 215, completes the metallurgical interconnection of the bumps 245 to the mating surface 244. The cured adhesive stabilizes the adhesion of the die. In an alternative embodiment of the preferred method, the adhesive may be applied to the surface of the die, or at least to the bumps on the surface of the die, rather than to the substrate. For example, the adhesive may be placed in a reservoir, and then the active side of the die is immersed in the adhesive and removed, so that the bump is loaded with a large amount of adhesive; then, the picking tool is used to place the die facing the fixed substrate. The active side of the die faces the die attach surface of the substrate, and then the die and the substrate are aligned and moved toward each other such that the bump contacts the corresponding wire (lead) on the substrate. Such a method is described in U.S. Patent No. 6,780,682, issued Aug. 24, 2004, the disclosure of which is incorporated herein by reference. Then, applying force, solidification, and melting are performed as described above. 97424.doc -19- 1378516 The force and temperature schedule for the procedure according to the present invention is illustrated by way of example in FIG. In this figure, the time progresses from left to right on the horizontal axis; the force profile 31 is shown as a thick line' and the temperature profile 320 is shown as a dashed line. The temperature wheel temple begins at &quot;from 9 80 C to a temperature of about 90 C. The contour of the force essentially begins with zero force. Starting from the initial time ti, the force is rapidly (almost immediately) raised from 匕 to 312 as the replacement/deformation force Fd and held at 314 for a period of time, as described below. Fd is a force large enough to replace the adhesive between the bump and the wire engaging surface; and preferably, sufficient to deform the fusible (lead contact) portion of the bump on the meshing surface to break the oxide film and form a good metal For metal (metallurgical) contacts, and in some embodiments, it is sufficient to establish a mechanical interlock ("twist" deformation) of the bumps and leads on the edges of the leads. The total amount of force required depends on the material and size of the bumps and on the number of bumps and can be determined without undue experimentation. As the force increases, the temperature also rises rapidly from the initial temperature to 322 to the gel temperature Tg. The gel temperature of D8 is a temperature sufficient to partially cure the adhesive (becoming a "gel"). The force and temperature ramps are preferably set such that the lag time tdef after reaching Fd and before reaching Tg is short, at least long enough to allow elevated forces to replace the adhesive and deform the bumps before the local cure of the adhesive begins. This assembly will maintain 3 14,324 in the replacement / deformation pressure 卩 (1 and gel temperature for a period of time tgel, enough to achieve partial curing of the adhesive. The adhesive should become stable enough to re-melt the solder The bump profile is substantially maintained during the period, that is, it is stable enough to avoid unnecessarily replacing the molten fusible material of the bump, or to prevent the melted fusible material from flowing along the lead. The adhesive is partially cured to a sufficient extent. After that, the pressure will drop rapidly to 318 until there is virtually no force (the weight of the component is 97424.doc • 20- ^). Then the temperature will increase by as much as the temperature Tm, enough to re-melt = the fusible part of the block (Solder), the assembly is held 325 for a period of re-shocking for a period of time W... at least sufficient to completely re-dissolve on the wire, and preferably sufficient to substantially (but not necessarily completely) cure the adhesive. Then, the temperature drops 328. The initial temperature is lowered to room temperature. The time period in which the process shown in Fig. 12 is performed is 5-10 seconds. The spotting agent of the specific embodiment of Fig. 12 may be referred to as "non-flow side filling: 茜". in- In the method of flip chip interconnection, metallurgical mutual Μ is formed first, and then the side fill material flows into the space between the die and the substrate. According to the invention, the flow side fills up to bond the die and the substrate. The method of pre-carrying and finishing the bumps on the leads, and filling the non-flow side by the opposite surface gP of the die and the substrate. The adhesive for filling the adhesive on the non-flow side according to the present invention is preferably a quick glue. Adhesives, that is, gels are sufficiently gelled during the time period in which the knee temperature lasts for a leap second level. Preferred materials for filling the adhesive on the non-flow side include so-called "non-conductive solder pastes" such as enamel. a ChemieaIs and L〇ktite Henkei lock-up agent. In the plug-in Μ π 4 according to the present invention, an alternative bump structure can also be used in the play bump interconnection. In particular, for example, "made" can be used. Synthetic solder bumps. Synthetic solder bumps have at least two bump portions (made of different bump materials), #included in the portion of the re-dissolving condition τ (4), and substantially non-dustable under the condition of back a flat part. The common materials used for the non-compressible parts include various tan materials with high ship (Pb) content. The part that can be pressed 4 and not 97424.doc -2J - can be crushed The combination of the portions and the flattenable portions can form a connection to the leads according to the present month. Typical conventional materials for the flattenable portions of the composite bumps include, for example, co-glazed solder. Using the f-bump shown in the top view of Fig. 13. Referring now to Fig. 3, the grain Μ provided on the side dies of the dies of the dies has a portion 345 including a non-dustable flat and (4) The composite bump of part 347. The flat part of the house is like a common material or a relatively low-temperature melting solder. The flattenable part can be (4) the meshing surface of the twisted wire, where the need for the bump on the lead is fusible. Part of the deformation, the flattenable portion of the bump will deform under the condition of the force applied. Non-squeezable parts such as solder with high error (). The non-squashable portion does not deform when the die is pressed against the substrate during processing, and does not smear during the rejuvenation phase of the program. Therefore, the unflattenable portion has a size that can be applied to the surface of the die. A projection distance is provided between the die attach surfaces of the substrate. It should be understood that, as shown in Figures 4 and 5, if the fully collapsible bumps are fabricated using synthetic bumps, it is not necessary to manufacture the bumps of the specific embodiments shown in Figures 6 and 7. The structures shown in these figures may additionally or utilize the on-lead soldering method as illustrated. Other embodiments are within the scope of the following claims. [Simplified description of the drawing] The cross-sectional view of the plane of the flip-chip interconnect of the block is parallel, as shown in Fig. 1 is a schematic diagram of the conventional captured trapped tantalum. 1' is shown. Figure 2 is a cross-sectional view showing the portion of the flip chip interconnect of the conventional solder bump on the capture pad 97742.doc • 22· 1378516, which is a cross-sectional view perpendicular to the plane of the surface of the package substrate, as shown by the arrow in Figure 1. 2-2' is shown. Figure 3 is a flip-chip interconnect showing bumps on another conventional capture pad. The drawing of the file is a cross-sectional view perpendicular to the plane of the surface of the package substrate. Circle 4 is a schematic view of a portion of a flip-chip interconnect of a bump on a lead according to the present invention, which is a cross-sectional view parallel to the plane of the surface of the package substrate. 5 is a schematic view of a portion of a flip-chip interconnect of a bump on a lead according to the present invention as shown in FIG. 4, which is a cross-sectional view perpendicular to the plane of the surface of the package substrate, as in FIG. Arrow 5_5, shown. Figure 6 is a schematic illustration of a portion of another embodiment of a flip chip interconnect of a bump on a lead according to the present invention, which is a cross-sectional view parallel to the surface of the package substrate. Circle 7 is a schematic illustration of a portion of a particular embodiment of a flip chip interconnect showing bumps on a lead according to the present invention as shown in FIG. 6, which is a cross-sectional view perpendicular to the plane of the surface of the package substrate, as in FIG. Arrow 7-7' is shown. Figures 8 and 9 are schematic illustrations of portions of a particular embodiment of a flip chip interconnect of a bump on a lead according to the present invention, which is a cross-sectional view parallel to the package substrate = face plane. A to 10 C are schematic views showing the steps of the procedure for forming the inverted wafer interconnection according to the present invention in a sectional view. 11A to 11D are schematic views showing the steps of a procedure for forming a wafer interconnection according to τ. 97424.doc • 23-1378516 Figure 12 is a schematic diagram showing the force and temperature schedules used to form the flip chip interconnect process in accordance with the present invention. Figure 13 is a cross-sectional view showing a flip chip interconnect of a bump on a lead according to the present invention having a composite bump. · [Major component symbol description] 10, 20, 30 Flip chip package part 11 die edge position 12 dielectric layer / substrate 12 substrate 13 lead 14 capture pad 15 interconnect bump 16. Insulation layer 17. Side filled material 11 Grain 19 Solder mask 29 Flowed bump material 31 Substrate 33 Lead 34 Capture pad 35 Bump 31 Side filled material 18 Grain 39 Solder mask material
97424.doc -24- 1378516 40 Portion 41 of the flip chip package of the present invention interconnection position 42 substrate dielectric layer 43 lead/difference wiring 45 bump 48 die 61 interconnection position / signal dissipation wiring 62 substrate dielectric layer 63 Lead/Dissipation Wiring 65 Bump 66 Dissipative Wiring 68 Die 81 Die Cover Edge 82 Substrate 83 Lead/Wiring 84 Interconnect Location 86 Solder Mask 88 Mask Opening 92 Substrate 93 Lead/Wiring 94 Interconnect Location 96 Solder Mask 98 Opening 101 Die back 90742.doc -25- 1378516 102 Die 103 Acting side 104 Bump 105 Bump 106 Chuck 108 Pick and place tool 112 Substrate 113 Die grain surface 114 Lead/wiring 115 Lead 116 Carrier Or Platform 122 Adhesive 132 Adhesive Curing Portion 134 Coupling Surface 140 Finished Flip Chip Interconnect 144 Halal Surface 145 Bump 155 Lead 156 Lead 202 Die 204 Bump 205 Bump 212 Substrate 214 Conductive (Metal) Wiring 97424.doc -26- 1378516 215 Lead/Wiring 216 Wiring 222 Adhesive 232 Adhesive 234 Halogenated Surface 236 Adhesive Part 244 Spray surface 245 Bump 246 Adhesive 302 Die 310 Force profile 3 12 Force profile rise 314 Force profile retention 318 Force profile drop 320 Temperature gallery 322 Temperature profile rise 323 Temperature porch rise south 324 temperature profile hold 325 temperature profile hold 328 temperature profile drop 345 non-squeezable part 347 squashed part 97424.doc -27-
1378516 Patent Application No. 093,134,366 Patent Application Patent Renewal (101 Sheep April), Patent Application Range: A flip-chip interconnect of bumps on a lead, which has a (e) winding density, which includes a die, a package substrate; and a plurality of solder bumps adhered to pads on one of the active ends of the die, wherein the solder bumps are composite bumps, and each solder bump is included in the die One of the solder pads is not squashed and the bump portion is located at a trace, and the solder bumps are fused on the wiring of the package substrate In conjunction with the locations, the interconnect locations have a parallel dimension defining a width of the interconnect location that is less than the width at which the solder bumps are melted. A flip chip interconnect of bumps on a lead of claim 1, wherein the die bond is located in a row adjacent to an edge of the die, and the corresponding interconnect locations are located adjacent to a die foot One of the bits - in the row. 3: a flip chip interconnect of a bump on a lead of a defect i, wherein the die bond is located in an array adjacent to an edge of the die, the corresponding interconnect locations being located near a crystal One of the edges of one of the edges of the grain is in the array. The flip chip interconnect of the bump on the lead of the item 1, further comprising a solder mask on the die attach end of the mounting substrate, having an opening at the interconnecting locations. The flip chip interconnect of the bump on the lead of claim 1 is provided, and the flattened bump portion comprises a lead solder. The flip chip interconnect of the bump on the lead of claim 1 is 2. 6. 97424-l〇l 〇4〇2.doc The solder mask should not be included in the solder mask
The bumps contain - solder' which is melted at a temperature at which the substrate is damaged during the reflow process. The flip chip interconnect of the bumps on the lead of the I 7::, 1 is avoided, wherein the bump fused portion contains a low melting point solder. 8. A semiconductor device comprising: a semiconductor die;
a substrate having a wiring having an interconnect portion having a width not greater than a width; the wiring comprising an interconnection portion, the interconnect portion of the wiring design having a regular width of 12%, and a composite interconnection having a meltable a portion and a non-meltable portion, the composite interconnection being formed between the interconnect portion and a bump pad of the semiconductor die, the meltable portion of the composite interconnect being directly formed on the
9. The semiconductor device of claim 8, the portion comprising a lead-containing solder material. 10. The semiconductor device of claim 8, comprising a low melting point solder material. 11. The semiconductor device board of claim 8, wherein the solder material of the composite interconnect is free from melting during the reflow process. Wherein the synthetic interconnect does not melt the fuser portion of the composite interconnect, wherein the substrate comprises an organic "melt portion comprising a solder material, the temperature of the organic substrate is damaged". The semiconductor device of item 8, wherein the non-meltable portion of the composite interconnection is adjacent to the bump pad on the semiconductor die. 13. The semiconductor device of claim 8, wherein the interconnect portion is placed The terminal 97424-1010402.doc 1378516 pole end, wherein the edge of the interconnect portion is perpendicular to the width of the interconnect portion, wherein the edge of the wire is perpendicular to the width of the wire, and wherein the interconnect portion The edge device is parallel to the sides of the wiring. The semiconductor device of claim 8, wherein the interconnection portion is disposed between the ends of the wiring, wherein the edge of the interconnection portion and the interconnection portion The width is perpendicular 'where the edge of the wire is perpendicular to the width of the wire, and wherein the sides of the interconnect are parallel to the sides of the wire. 15. A method of fabricating a semiconductor device, comprising ·· mention Providing a semiconductor die; providing a substrate; forming a plurality of wires on the / board - each of the wires has an interconnection, and the plane of the interconnected wire is parallel to the wire The width of the interconnection is not greater than one of the wires; 120% of the degree; and; the interconnection locations and the plurality of composite interconnections between the bump pads of the semiconductor die are formed The composite interconnect has a meltable portion and a non-meltable portion. 16. The method of claim 15 further comprising: a wiring such as 5; and an adhesive layer formed on one surface of the substrate; and performing the following steps in sequence Forming an interconnect structure between each of the composite interconnects and the interconnect locations: (a) applying a first temperature without applying a force to the interconnect structure and the adhesion layer; (b) accompanying the first temperature Applying a force to dispose of the adhesive layer, 敫97424-10l0402.doc 1378516 deforms the interconnect structure at the interconnection location; (C) applying a force higher than the first layer when the force is maintained to partially cure the adhesive layer One temperature, one second temperature; (d) when dimension Removing the force when the second temperature is held; (e) applying a second temperature above the second temperature after removing the force, and (f) removing the third temperature. The method of 15 further comprising: forming an interconnect structure between the composite interconnects and the interconnect locations by (a) applying a force at the first temperature to cause the interconnect locations The interconnect structure is deformed; (b) the force is removed when the first temperature is maintained; 0) after the force is removed, a temperature higher than the first temperature is applied, and
The method of splitting the first month of the fifteenth month, wherein the non-meltable portion of the synthetic interconnect contains a lead-containing solder material β. 19. The method of claim 15 wherein the compatible portion of the synthetic interconnect A low melting point solder material. 3 ▲ method of claim 15 wherein the substrate comprises an organic substrate, wherein &quot;Hai. The meltable portion of the interconnect comprises a solder material that is resistant to damage to the organic substrate during the reflow process - melting at a temperature: as in the method of claim 15, further comprising: 97424.1010402.doc 1378516 Forming a meltable portion of the composite interconnect adjacent to the wiring; and forming the non-meltable portion of the composite interconnect adjacent to the bump pad of the semiconductor die. 97424-1010402.doc
TW093134366A 2003-11-10 2004-11-10 Bump-on-lead flip chip interconnection TWI378516B (en)
TW200525666A TW200525666A (en) 2005-08-01
TWI378516B true TWI378516B (en) 2012-12-01
TW101111925A TWI478254B (en) 2003-11-10 2004-11-10 Bump-on-lead flip chip interconnection
TW101133048A TWI534915B (en) 2003-11-10 2004-11-10 Bump-on-lead flip chip interconnection
TW093134366A TWI378516B (en) 2003-11-10 2004-11-10 Bump-on-lead flip chip interconnection
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