Redistribution layer structure and semiconductor package

An RDL structure including a first pad, a second pad, a third pad, a fourth pad, a first switch device, a second switch device, a third switch device, and a fourth switch device is provided. The first pad, the second pad, the third pad, and the fourth pad are separated from each other. The first switch device includes a first conductive layer and a second conductive layer separated from each other. The second switch device includes a third conductive layer and a fourth conductive layer separated from each other. The third switch device includes a fifth conductive layer and a sixth conductive layer separated from each other. The fourth switch device includes a seventh conductive layer and an eighth conductive layer separated from each other.

BACKGROUND OF THE INVENTION

Field of the Invention

The invention relates to a semiconductor structure, and particularly relates to a redistribution layer (RDL) structure and a semiconductor package.

Description of Related Art

In order for electronic product design to achieve being light, slim, short, and small, semiconductor packaging technology has kept progressing, in attempt to develop products that are smaller in volume, lighter in weight, higher in integration, and more competitive in market. For example, in some products, if a package requires multi-chip stacking, different RDL structures are generally required to provide the connection. However, since the different RDL structures need to be fabricated using different masks, the production cost is increased.

SUMMARY OF THE INVENTION

The invention provides an RDL structure and a semiconductor package, which can effectively reduce the production cost.

The invention provides an RDL structure, which includes a first pad, a second pad, a third pad, a fourth pad, a first switch device, a second switch device, a third switch device, and a fourth switch device. The first pad, the second pad, the third pad, and the fourth pad are separated from each other. The first switch device includes a first conductive layer and a second conductive layer separated from each other. The first conductive layer is coupled to the first pad. The second conductive layer is coupled to the third pad. The second switch device includes a third conductive layer and a fourth conductive layer separated from each other. The third conductive layer is coupled to the first pad. The fourth conductive layer is coupled to the fourth pad. The third switch device includes a fifth conductive layer and a sixth conductive layer separated from each other. The fifth conductive layer is coupled to the second pad. The sixth conductive layer is coupled to the third pad. The fourth switch device includes a seventh conductive layer and an eighth conductive layer separated from each other. The seventh conductive layer is coupled to the second pad. The eighth conductive layer is coupled to the fourth pad.

According to an embodiment of the invention, the RDL structure may further include a first conductive line, a second conductive line, a third conductive line, a fourth conductive line, a fifth conductive line, a sixth conductive line, a seventh conductive line, and an eighth conductive line. The first conductive line is coupled between the first conductive layer and the first pad. The second conductive line is coupled between the second conductive layer and the third pad. The third conductive line is coupled between the third conductive layer and the first pad. The fourth conductive line is coupled between the fourth conductive layer and the fourth pad. The fifth conductive line is coupled between the fifth conductive layer and the second pad. The sixth conductive line is coupled between the sixth conductive layer and the third pad. The seventh conductive line is coupled between the seventh conductive layer and the second pad. The eighth conductive line is coupled between the eighth conductive layer and the fourth pad.

According to an embodiment of the invention, in the RDL structure, the first conductive line, the first conductive layer, and the first pad may be integrally formed. The second conductive line, the second conductive layer, and the third pad may be integrally formed. The third conductive line, the third conductive layer, and the first pad may be integrally formed. The fourth conductive line, the fourth conductive layer, and the fourth pad may be integrally formed. The fifth conductive line, the fifth conductive layer, and the second pad may be integrally formed. The sixth conductive line, the sixth conductive layer, and the third pad may be integrally formed. The seventh conductive line, the seventh conductive layer, and the second pad may be integrally formed. The eighth conductive line, the eighth conductive layer, and the fourth pad may be integrally formed.

According to an embodiment of the invention, the RDL structure may further include a fifth pad and a sixth pad. The fifth pad is coupled to the third pad. The sixth pad is coupled to the fourth pad.

According to an embodiment of the invention, the RDL structure may further include a ninth conductive line and a tenth conductive line. The ninth conductive line is coupled between the third pad and the fifth pad. The tenth conductive line is coupled between the fourth pad and the sixth pad.

According to an embodiment of the invention, in the RDL structure, the ninth conductive line, the third pad, and the fifth pad may be integrally formed. The tenth conductive line, the fourth pad, and the sixth pad may be integrally formed.

According to an embodiment of the invention, the RDL structure may further include at least one dummy pad. The dummy pad is separated from the first pad, the second pad, the third pad, the fourth pad, the first switch device, the second switch device, the third switch device, and the fourth switch device.

The invention provides a semiconductor package, which includes a first die, a second die, a first RDL structure, and a second RDL structure. The first RDL structure is disposed on the first die. The second RDL structure is disposed on the second die. The first RDL structure and the second RDL structure respectively include the above-mentioned RDL structure. The first RDL structure and the second RDL structure are located between the first die and the second die and coupled to each other.

According to an embodiment of the invention, in the semiconductor package, the third pad of the first RDL structure may be coupled to the fourth pad of the second RDL structure. The fourth pad of the first RDL structure may be coupled to the third pad of the second RDL structure.

According to an embodiment of the invention, the semiconductor package may further include a first electrical connector and a second electrical connector. The first electrical connector is coupled between the third conductive layer of the first RDL structure and the fourth conductive layer of the first RDL structure. The second electrical connector is coupled between the fifth conductive layer of the first RDL structure and the sixth conductive layer of the first RDL structure.

According to an embodiment of the invention, the semiconductor package may further include a third electrical connector and a fourth electrical connector. The third electrical connector is coupled between the first conductive layer of the second RDL structure and the second conductive layer of the second RDL structure. The fourth electrical connector is coupled between the seventh conductive layer of the second RDL structure and the eighth conductive layer of the second RDL structure.

According to an embodiment of the invention, the semiconductor package may further include a fifth electrical connector and a sixth electrical connector. The fifth electrical connector is coupled between the third pad of the first RDL structure and the fourth pad of the second RDL structure. The sixth electrical connector is coupled between the fourth pad of the first RDL structure and the third pad of the second RDL structure.

According to an embodiment of the invention, in the semiconductor package, the RDL structure may further include a first conductive line, a second conductive line, a third conductive line, a fourth conductive line, a fifth conductive line, a sixth conductive line, a seventh conductive line, and an eighth conductive line. The first conductive line is coupled between the first conductive layer and the first pad. The second conductive line is coupled between the second conductive layer and the third pad. The third conductive line is coupled between the third conductive layer and the first pad. The fourth conductive line is coupled between the fourth conductive layer and the fourth pad. The fifth conductive line is coupled between the fifth conductive layer and the second pad. The sixth conductive line is coupled between the sixth conductive layer and the third pad. The seventh conductive line is coupled between the seventh conductive layer and the second pad. The eighth conductive line is coupled between the eighth conductive layer and the fourth pad.

According to an embodiment of the invention, in the semiconductor package, the first conductive line, the first conductive layer, and the first pad may be integrally formed. The second conductive line, the second conductive layer, and the third pad may be integrally formed. The third conductive line, the third conductive layer, and the first pad may be integrally formed. The fourth conductive line, the fourth conductive layer, and the fourth pad may be integrally formed. The fifth conductive line, the fifth conductive layer, and the second pad may be integrally formed. The sixth conductive line, the sixth conductive layer, and the third pad may be integrally formed. The seventh conductive line, the seventh conductive layer, and the second pad may be integrally formed. The eighth conductive line, the eighth conductive layer, and the fourth pad may be integrally formed.

According to an embodiment of the invention, in the semiconductor package, the RDL structure may further include a fifth pad and a sixth pad. The fifth pad is coupled to the third pad. The sixth pad is coupled to the fourth pad.

According to an embodiment of the invention, in the semiconductor package, the RDL structure may further include a ninth conductive line and a tenth conductive line. The ninth conductive line is coupled between the third pad and the fifth pad. The tenth conductive line is coupled between the fourth pad and the sixth pad.

According to an embodiment of the invention, in the semiconductor package, the ninth conductive line, the third pad, and the fifth pad may be integrally formed. The tenth conductive line, the fourth pad, and the sixth pad may be integrally formed.

According to an embodiment of the invention, in the semiconductor package, the RDL structure may further include at least one dummy pad. The dummy pad is separated from the first pad, the second pad, the third pad, the fourth pad, the first switch device, the second switch device, the third switch device, and the fourth switch device.

According to an embodiment of the invention, the semiconductor package may further include a substrate. The first die and the second die may be stacked on the substrate. The second die may be located between the first die and the substrate.

According to an embodiment of the invention, the semiconductor package may further include an encapsulant. The first die and the second die are encapsulated by the encapsulant.

Based on the above, the RDL structure according to the invention includes the first switch device, the second switch device, the third switch device, and the fourth switch device. Therefore, the coupling relationship between the pads can be determined by respectively setting the first switch device, the second switch device, the third switch device, and the fourth switch device to the “on state” or the “off state”. In this way, various wiring methods of RDL can be achieved by the same RDL structure. In the semiconductor package according to the invention, since the RDL structure can be used to achieve various wiring methods of RDL, the first die and the second die can be coupled to each other by the first and second RDL structures having the same RDL layout pattern. Therefore, the quantity of the photomask can be effectively reduced, and the production cost can be reduced.

In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, several exemplary embodiments accompanied with figures are described in detail below.

DESCRIPTION OF THE EMBODIMENTS

FIG. 1is a top view illustrating an RDL structure according to an embodiment of the invention.

Referring toFIG. 1A, an RDL structure100includes a pad102a, a pad102b, a pad102c, a pad102d, a switch device104a, a switch device104b, a switch device104c, and a switch device104d. RDL structure100is, for example, an RDL layout pattern.

The pad102a, the pad102b, the pad102c, and the pad102dare separated from each other. In the present embodiment, the pad102aand the pad102bcan be used as die pads, and the pad102cand the pad102dcan be used as solder pads, but the invention is not limited thereto. Furthermore, the pad102aand the pad102bare, for example, located between the pad102cand the pad102d, but the invention is not limited thereto. One of ordinary skill in the art can adjust the arrangement of the pad102a, the pad102b, the pad102c, and the pad102daccording to the product design. The material of the pads102a-102dis, for example, copper (Cu), aluminum (Al), nickel (Ni), or gold (Au).

The switch device104aincludes a conductive layer106aand a conductive layer106bseparated from each other. The conductive layer106ais coupled to the pad102a. The conductive layer106bis coupled to the pad102c. The switch device104bincludes a conductive layer106cand a conductive layer106dseparated from each other. The conductive layer106cis coupled to the pad102a. The conductive layer106dis coupled to the pad102d. The switch device104cincludes a conductive layer106eand a conductive layer106fseparated from each other. The conductive layer106eis coupled to the pad102b. The conductive layer106fis coupled to the pad102c. The switch device104dincludes a conductive layer106gand a conductive layer106hseparated from each other. The conductive layer106gis coupled to the pad102b. The conductive layer106his coupled to the pad102d. In the present embodiment, the term “coupled” may be “directly coupled” or “indirectly coupled”. The material of the conductive layers106a-106his, for example, copper (Cu), aluminum (Al), nickel (Ni), or gold (Au).

The switch device104acan be used to determine the coupling relationship between the pad102aand the pad102c. The switch device104bcan be used to determine the coupling relationship between the pad102aand the pad102d. The switch device104ccan be used to determine the coupling relationship between the pad102band the pad102c. The switch device104dcan be used to determine the coupling relationship between the pad102band the pad102d.

Hereinafter, the switch device104ais taken as an example for explanation. When the conductive layer106aand the conductive layer106bare not coupled to each other, the switch device104ais in the “off state”, and the pad102aand the pad102care not coupled to each other. When the conductive layer106aand the conductive layer106bare coupled to each other by an electrical connector (e.g., solder ball), the switch device104ais in the “on state”, and the pad102aand the pad102care coupled to each other.

Moreover, the RDL structure100may further include a conductive line108a, a conductive line108b, a conductive line108c, a conductive line108d, a conductive line108e, a conductive line108f, a conductive line108g, and a conductive line108h. The conductive line108ais coupled between the conductive layer106aand the pad102a. The conductive line108a, the conductive layer106a, and the pad102amay be integrally formed. The conductive line108bis coupled between the conductive layer106band the pad102c. The conductive line108b, the conductive layer106b, and the pad102cmay be integrally formed. The conductive line108cis coupled between the conductive layer106cand the pad102a. The conductive line108c, the conductive layer106c, and the pad102amay be integrally formed. The conductive line108dis coupled between the conductive layer106dand the pad102d. The conductive line108d, the conductive layer106d, and the pad102dmay be integrally formed. The conductive line108eis coupled between the conductive layer106eand the pad102b. The conductive line108e, the conductive layer106e, and the pad102bmay be integrally formed. The conductive line108fis coupled between the conductive layer106fand the pad102c. The conductive line108f, the conductive layer106f, and the pad102cmay be integrally formed. The conductive line108gis coupled between the conductive layer106gand the pad102b. The conductive line108g, the conductive layer106g, and the pad102bmay be integrally formed. The conductive line108his coupled between the conductive layer106hand the pad102d. The conductive line108h, the conductive layer106h, and the pad102dmay be integrally formed. The material of the conductive lines108a˜108his, for example, copper (Cu), aluminum (Al), nickel (Ni), or gold (Au).

The conductive lines coupled to the same pad may be separated from each other or have the shared portion. Hereinafter, the conductive lines108a,108c,108e, and108gare taken as examples for explanation. In the present embodiment, the conductive line108aand the conductive line108care coupled to the same pad102aand separated from each other, but the invention is not limited thereto. In other embodiment, the conductive line108aand the conductive line108ccoupled to the same pad102amay have the shared portion. In the present embodiment, the conductive line108eand the conductive line108gare coupled to the same pad102band have the shared portion, but the invention is not limited thereto. In other embodiment, the conductive line108eand the conductive line108gcoupled to the same pad102bmay be separated from each other.

In addition, the RDL structure100may further include a pad102eand a pad102f. The pad102eis coupled to the pad102c. The pad102fis coupled to the pad102d. The pad102eand the pad102fcan be used as bond pads. The material of the pads102eand102fis, for example, copper (Cu), aluminum (Al), nickel (Ni), or gold (Au).

Besides, the RDL structure100may further include a conductive line108iand a conductive line108j. The conductive line108iis coupled between the pad102cand the pad102e. The conductive line108i, the pad102c, and the pad102emay be integrally formed. The conductive line108jis coupled between the pad102dand the pad102f. The conductive line108j, the pad102d, and the pad102fmay be integrally formed. The material of the conductive lines108iand108jis, for example, copper (Cu), aluminum (Al), nickel (Ni), or gold (Au).

Furthermore, the RDL structure100may further include at least one dummy pad. For example, the RDL structure100may include a dummy pad110a, a dummy pad110b, a dummy pad110c, and a dummy pad110d, but the invention is not limited thereto. The dummy pads110a˜110dare separated from the pads102a˜102f, the switch devices104a˜104d, and the conductive lines108a˜108j. The dummy pads110a˜110dcan be used to support the electrical connectors (e.g., solder ball) (not shown).

Based on the above, in the RDL structure100of the aforementioned embodiments, the coupling relationship between the pads can be determined by respectively setting the switch device104a, the switch device104b, the switch device104c, and the switch device104dto the “on state” or the “off state”. In this way, various wiring methods of RDL can be achieved by the same RDL structure100, so that the quantity of the photomask can be effectively reduced, thereby reducing the production cost.

FIG. 2is a side view illustrating a semiconductor package according to an embodiment of the invention. Some of the components and reference numerals are omitted inFIG. 2to clearly illustrate the arrangement relationship between the electrical connectors114a,114b,114e,114fand the components coupled to the electrical connectors114a,114b,114e,114f.FIG. 3is a top view illustrating the RDL structures disposed on the dies inFIG. 2.FIG. 4is a schematic diagram illustrating the RDL structures after flipping one of the dies ofFIG. 3.

Referring toFIG. 1toFIG. 4, a semiconductor package10includes a die112a, a die112b, an RDL structure100a, and an RDL structure100b. In the present embodiment, the above-mentioned RDL structure100is exemplified by applying to the semiconductor package10, but the invention is not limited thereto.

The RDL structure100can be applied to any semiconductor package10to flexibly design the wiring method of RDL. The semiconductor package10is, for example, a dual die package (DDP), but the invention is not limited thereto. In the present embodiment, the semiconductor package10is exemplified by a flip chip package (FCP).

The RDL structure100ais disposed on the die112a. The RDL structure100bis disposed on the die112b. The RDL structure100aand the RDL structure100brespectively include the above-mentioned RDL structure100. In other words, the RDL structure100aand the RDL structure100binclude all of the components of the RDL structure100. The pad102aof the RDL structure100aand the pad102bof the RDL structure100amay be coupled to the die112a. The pad102aof the RDL structure100band the pad102bof the RDL structure100bmay be coupled to the die112b. Furthermore, the material, the arrangement, and the effect of each component of the RDL structure100have been described in detail in the above embodiments, and are not repeated herein.

The RDL structure100aand the RDL structure100bare located between the die112aand the die112band coupled to each other. For example, the pad102cof the RDL structure100amay be coupled to the pad102dof the RDL structure100b, and the pad102dof the RDL structure100amay be coupled to the pad102cof the RDL structure100b.

The semiconductor package10may further include at least one of an electrical connector114a, an electrical connector114b, an electrical connector114c, an electrical connector114d, an electrical connector114e, an electrical connector114f, a substrate116, a bonding wire118a, a bonding wire118b, and an encapsulant120. The electrical connectors114a-114fare, for example, solder balls, conductive pillars (e.g., copper pillar), a combination thereof, or the like. In the present embodiment, the electrical connectors114a-114fare exemplified by solder balls, but the invention is not limited thereto.

The electrical connector114ais coupled between the conductive layer106cof the RDL structure100aand the conductive layer106dof the RDL structure100a. Thereby, in the RDL structure100a, the switch device104bis in the “on state”, and the pad102aand the pad102dare coupled to each other. The electrical connector114bis coupled between the conductive layer106eof the RDL structure100aand the conductive layer106fof the RDL structure100a. Thereby, in the RDL structure100a, the switch device104cis in the “on state”, and the pad102band the pad102care coupled to each other. Furthermore, in the RDL structure100a, since the switch device104aand the switch device104dare in the “off state”, the pad102aand the pad102care not coupled to each other, and the pad102band the pad102dare not coupled to each other.

The electrical connector114cis coupled between the conductive layer106aof the RDL structure100band the conductive layer106bof the RDL structure100b. Thereby, in the RDL structure100b, the switch device104ais in the “on state”, and the pad102aand the pad102care coupled to each other. The electrical connector114dis coupled between the conductive layer106gof the RDL structure100band the conductive layer106hof the RDL structure100b. Thereby, in the RDL structure100b, the switch device104dis in the “on state”, and the pad102band the pad102dare coupled to each other. Furthermore, in the RDL structure100b, since the switch device104band the switch device104care in the “off state”, the pad102aand the pad102dare not coupled to each other, and the pad102band the pad102care not coupled to each other.

The electrical connector114eis coupled between the pad102cof the RDL structure100aand the pad102dof the RDL structure100b. The electrical connector114fis coupled between the pad102dof the RDL structure100aand the pad102cof the RDL structure100b. Thereby, the RDL structure100aand the RDL structure100bcan be coupled to each other.

In this way, the pad102aof the RDL structure100aand the pad102aof the RDL structure100bcan be coupled to each other, and the pad102bof the RDL structure100aand the pad102bof the RDL structure100bcan be coupled to each other. Moreover, since the RDL structure100can be used to achieve various wiring methods of RDL, the die112aand the die112bcan be coupled to each other by the RDL structures100aand100bhaving the same RDL layout pattern. Therefore, the quantity of the photomask can be effectively reduced, and the production cost can be reduced.

Furthermore, the dummy pad110bof the RDL structure100acan be used to support the electrical connector114c. The dummy pad110cof the RDL structure100acan be used to support the electrical connector114d. The dummy pad110aof the RDL structure100bcan be used to support the electrical connector114a. The dummy pad110dof the RDL structure100bcan be used to support the electrical connector114b.

The die112aand the die112bmay be stacked on the substrate116. The die112bmay be located between the die112aand the substrate116, but the invention is not limited thereto. Furthermore, the substrate116may have a first side S1and a second side S2opposite to each other. The die112aand the die112bmay be located on the first side S1. The substrate116is, for example, a package substrate such as a printed circuit board (PCB).

The bonding wires118aand118bcan be used to couple the RDL structure100bto the substrate116, but the invention is not limited thereto. For example, the bonding wires118amay be coupled between the pad102eof the RDL structure100band the substrate116, and the bonding wires118bmay be coupled between the pad102fof the RDL structure100band the substrate116.

The die112aand the die112bare encapsulated by the encapsulant120. Therefore, the encapsulant120can be used to protect the die112aand the die112b. The encapsulant120includes a molding compound, a resin such as epoxy, a combination thereof, or the like.

In the present embodiment, the semiconductor package10is exemplified by including one RDL structure100aand one RDL structure100b, but the invention is not limited thereto. In other embodiment, the semiconductor package10may include a plurality of RDL structures100adisposed on the die112aand a plurality of RDL structures100bdisposed on the die112b.

In some embodiments, the semiconductor package10may further include other components known in the art (e.g., an under bump metallization (UBM) layer (not shown) or at least one electrical connector (not shown) located on the second side S2of the substrate116), and will not be described herein.

Based on the above, in the semiconductor package10of the aforementioned embodiments, since the RDL structure100can be used to achieve various wiring methods of RDL, the die112aand the die112bcan be coupled to each other by the RDL structures100aand100bhaving the same RDL layout pattern. Therefore, the quantity of the photomask can be effectively reduced, and the production cost can be reduced.

In summary, in the RDL structure and the semiconductor package of the aforementioned embodiments, various wiring methods of RDL can be achieved by the same RDL structure, so that the quantity of the photomask can be effectively reduced, thereby reducing the production cost.