SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD FOR SEMICONDUCTOR DEVICE

A semiconductor device includes a mounting substrate having a first surface, a semiconductor chip mounted on the first surface and having a second surface facing a side opposite to the first surface, and a wire extending from a first joint point on the first surface toward a second joint point on the second surface and electrically connecting the mounting substrate and the semiconductor chip to each other by connecting the first joint point and the second joint point to each other. The wire includes a first part, a first bent portion, a second part, a second bent portion, and a third part arranged in order from the first joint point toward the second joint point. The first part is positioned on the first surface side with respect to the second surface when viewed in a first direction along the first surface and the second surface.

TECHNICAL FIELD

The present disclosure relates to a semiconductor device and a manufacturing method for a semiconductor device.

BACKGROUND ART

Patent Literature 1 describes a semiconductor device. In this semiconductor device, a pad (first bonding point) of a semiconductor chip mounted in a lead frame and a lead (second bonding point) of the lead frame are connected to each other using a wire. A shape of a wire loop connected to the first bonding point and the second bonding point is a trapezoidal shape in a side view due to a neck height portion on the first bonding point side, an inclined portion on the second bonding point side, and a trapezoidal length part (loop top part) between the neck height portion and the inclined portion. The trapezoidal length part is formed with a tendency of having a shape recessed downward.

CITATION LIST

Patent Literature

SUMMARY OF INVENTION

Technical Problem

The foregoing semiconductor device described in Patent Literature 1 aims to form a loop having a strong shape retaining force against pressurization from outside by forming a loop top part of a wire with a tendency of having a recessed shape.

On the other hand, such semiconductor devices described above are required to be sealed with a resin. In this case, a sealing resin is also disposed between the wire and a lead frame (the wire holds a sealing resin). Therefore, stress caused by expansion and contraction of the sealing resin due to a thermal cycle is applied to the wire. As an amount of resin between the wire and the lead frame increases, stress applied to the wire according to the thermal cycle increases, and thus there is concern that the wire may be damaged and reliability may be degraded.

An object of the present disclosure is to provide a semiconductor device and a manufacturing method for a semiconductor device capable of curbing degradation in reliability.

Solution to Problem

A semiconductor device according to the present disclosure includes a mounting substrate having a first surface, a semiconductor chip mounted on the first surface and having a second surface facing a side opposite to the first surface, and a wire extending from a first joint point on the first surface toward a second joint point on the second surface and electrically connecting the mounting substrate and the semiconductor chip to each other by connecting the first joint point and the second joint point to each other. The wire includes a first part, a first bent portion, a second part, a second bent portion, and a third part arranged in order from the first joint point toward the second joint point. The first part is positioned on the first surface side with respect to the second surface when viewed in a first direction along the first surface and the second surface. The first bent portion is positioned on the first surface side with respect to the second surface when viewed in the first direction and is bent such that the second part is guided to the second surface side. The second part extends over the second surface on a side opposite to the first surface when viewed in the first direction. The second bent portion is bent such that the third part is guided to the second surface side. The third part extends from a position over the second surface on a side opposite to the first surface toward the second surface when viewed in the first direction and is joined to the second joint point.

In this semiconductor device, a wire for electrically connecting the mounting substrate and the semiconductor chip mounted on the mounting substrate to each other is provided. The wire connects the first joint point on the first surface of the mounting substrate on which the semiconductor chip is mounted and the second joint point on the second surface of the semiconductor chip to each other. The wire includes the first part, the first bent portion, the second part, the second bent portion, and the third part arranged in order from the first joint point toward the second joint point (from the mounting substrate toward the semiconductor chip). The first part is a part of the wire extending from the first joint point and is positioned on the first surface side with respect to the second surface (for example, below the second surface). In addition, the third part is a part of the wire joined to the second joint point and is positioned at a position over the second surface on a side opposite to the first surface (for example, above the second surface). The second part is a part between the first part and the third part and extends over the second surface from a position on the first surface side.

According to such a structure, when the semiconductor device is resin-sealed, a sealing resin is disposed between the wire and the mounting substrate. On the contrary, regarding this wire, the first bent portion between the first part and the second part is positioned on the first surface side with respect to the second surface and is bent such that the second part is guided to the second surface side. Namely, compared to a case of having no first bent portion, the wire (that is, the first part) extends to the first surface side until it reaches the first bent portion. In the meantime, after it reaches the first bent portion, the wire (that is, the second part) extends over the second surface. Namely, compared to a case of having no first bent portion, the wire extends along edge portions formed by the mounting substrate and the semiconductor chip. As a result, an amount of resin held by the wire when the semiconductor device is resin-sealed is reduced. Thus, according to this semiconductor device, stress applied to the wire according to a thermal cycle can be reduced, and degradation in reliability can be curbed.

In this semiconductor device, the wire is bent at a position over the second surface in the second bent portion between the second part and the third part, and the third part is guided to the second surface side. Further, the third part extends from a position over the second surface toward the second surface and is joined to the second joint point. For this reason, compared to a case in which the second bent portion and the third part are not provided and the second part extends from the first surface side and is directly joined to the second joint point, a situation in which the wire comes into contact with an edge portion of the semiconductor chip is avoided. Thus, degradation in reliability can be further curbed.

In the semiconductor device according to the present disclosure, the first bent portion may be positioned on the first joint point side with respect to a center of the wire in an extending direction. In this case, the first bent portion is formed at a position comparatively away from the semiconductor chip. As a result, when the first bent portion is formed, a situation in which a holding tool (capillary) for holding the wire comes into contact with the semiconductor chip is curbed.

In the semiconductor device according to the present disclosure, the first bent portion may be positioned on the second joint point side with respect to a center of the wire in an extending direction. In this case, the first bent portion is formed at a position comparatively closer to the semiconductor chip. As a result, a relatively long part of the wire extending to the first surface side (first part) is secured so that the amount of resin held by the wire is further reduced. That is, stress applied to the wire can be reliably reduced, and degradation in reliability can be reliably curbed.

In the semiconductor device according to the present disclosure, the wire may include a fourth part extending such that the first bent portion and the second part are connected to each other. In this case, since an amount of height of the semiconductor chip from the first surface can be secured by at least two parts such as the second part and the fourth part, sharp bending in which concentration of stress is likely to occur is no longer necessary. Thus, degradation in reliability can be more reliably curbed.

In the semiconductor device according to the present disclosure, the wire may extend obliquely with respect to an outer edge of the semiconductor chip when viewed in a second direction intersecting the second surface. In this case, compared to a case in which the wire is perpendicular to the outer edge of the semiconductor chip, it is easy to secure a long length of the wire (a distance between the first joint point and the second joint point). As a result, it is easy to realize the foregoing structure of a wire including a plurality of parts and a plurality of bent portions.

A manufacturing method for a semiconductor device according to the present disclosure is a manufacturing method for a semiconductor device for manufacturing the foregoing semiconductor device including a first step of preparing the mounting substrate, the semiconductor chip mounted on the first surface of the mounting substrate, and at least a base material for the wire; a second step of moving a capillary holding the base material to the first joint point and joining a tip of the base material caused to protrude from the capillary to the first joint point, after the first step; a third step of moving the capillary while the base material is drawn from the capillary and forming at least the first part, the first bent portion, the second part, the second bent portion, and the third part arranged in order, after the second step; and a fourth step of moving the capillary to the second joint point and constituting the wire extending from the first joint point to the second joint point by joining the base material to the second joint point, after the third step.

According to this manufacturing method, the semiconductor device described above is manufactured. That is, a semiconductor device capable of curbing degradation in reliability is obtained.

The manufacturing method for a semiconductor device according to the present disclosure may further include a fifth step of moving the capillary to the second joint point and forming a bonding portion at the second joint point by joining a tip of the base material caused to protrude from the capillary to the second joint point and cutting the tip thereafter, after the first step and before the second step. In the fourth step, the base material may be joined to the second joint point with the bonding portion therebetween. In this case, when the tip of the base material protruding from the capillary is joined to the second joint point after each of the portions of the wire is formed, a bonding portion which has already been formed at the second joint point is interposed therebetween, and thus an impact to the semiconductor chip side is reduced. Particularly, here, since the bonding portion is formed using the capillary and the base material for forming each of the portions of the wire, simplification of the steps is achieved.

Advantageous Effects of Invention

According to the present disclosure, it is possible to provide a semiconductor device and a manufacturing method for a semiconductor device capable of curbing degradation in reliability.

DESCRIPTION OF EMBODIMENTS

Hereinafter, embodiments will be described in detail with reference to the drawings. In each of the drawings, the same reference signs are applied to elements which are the same or corresponding, and duplicate description thereof may be omitted.

FIG.1is a view illustrating a semiconductor device according to an embodiment.FIG.1(a)is a schematic plan view, andFIG.1(b)is a schematic cross-sectional view along line Ib-Ib inFIG.1(a).FIG.2is photographs showing an example of the semiconductor device illustrated inFIG.1. As illustrated inFIGS.1and2, a semiconductor device1includes a mounting substrate10, a semiconductor chip20, wires30, and a resin portion M. InFIG.1(a), illustration of the resin portion M is omitted.

The mounting substrate10includes a front surface (first surface)10sand a rear surface10ron a side opposite to the front surface10s.A plurality of electrodes13having a flat plate shape are formed on the front surface10s.As an example, each of the plurality of electrodes13has a shape elongated in a direction along an outer edge20eof the semiconductor chip20, which will be described below. The plurality of electrodes13are arranged along the outer edge20e.

The semiconductor chip20is mounted on the front surface10s.The semiconductor chip20may be directly disposed on the front surface10sor may be disposed on the front surface10swith another member therebetween. The semiconductor chip20includes a front surface (second surface)20sand a rear surface20ron a side opposite to the front surface20s.The front surface20sand the rear surface20rregulate a height T of the semiconductor chip20from the front surface10sas a distance therebetween. The rear surface20ris a surface facing the front surface10sside of the mounting substrate10, and the front surface20sis a surface facing a side opposite to the front surface10sof the mounting substrate10. Here, at least the front surface10sand the front surface20sare parallel to each other.

As an example, the semiconductor chip20exhibits a rectangular parallelepiped shape and has the outer edge20ewhich linearly extends.

The outer edge20eis an outer edge facing the electrode13side (a bonding portion51side which will be described below) in the outer edges of the semiconductor chip20. For example, the semiconductor chip20is a semiconductor light receiving element (as an example, a Si photodiode).

The bonding portions51are formed on the front surface10sof the mounting substrate10, and bonding portions52are formed on the front surface20sof the semiconductor chip20. The bonding portions51are formed on the electrodes13. The bonding portions52are formed on electrodes21exposed on the front surface20sside of the semiconductor chip20and are electrically connected to the semiconductor chip20. As described below, here, the bonding portions51and52are integrally formed with the wires30using the same material as the wires30. Therefore, the wires30are joined to the electrodes13with the bonding portions51therebetween on the mounting substrate10side and are joined to the electrodes21with the bonding portions52therebetween on the semiconductor chip20side. Namely, the electrodes13are first joint points of the wires30, and the electrodes21are second joint points of the wires30. The outer edge20eof the semiconductor chip20and edge portions of the electrodes13on the outer edge20eside regulate distances D between the semiconductor chip20and the electrodes13.

Hereinafter, a direction intersecting (orthogonal to) the direction from the electrodes13toward the electrodes21(an extending direction of the wires30) and a direction along the front surfaces10sand20smay be referred to as a first direction, and a direction intersecting (orthogonal to) the front surfaces10sand20smay be referred to as a second direction. The first direction is a horizontal direction, as an example, and the second direction is a vertical direction, as an example.

In addition, a constitution such as a recessed portion or a hole portion for reducing a thickness of the mounting substrate10(a distance between the front surface10sand the rear surface10r) is not provided between regions in which the electrodes13are provided on the front surface10sof the mounting substrate10and a region in which the semiconductor chip20is provided on the front surface10s.For this reason, the thickness of the mounting substrate10is uniform throughout the regions in which the electrodes13are provided on the front surface10s,the region in which the semiconductor chip20is provided on the front surface10s,and regions therebetween. However, the thickness of the mounting substrate10may be larger than those in other regions in regions between the regions in which the electrodes13are provided on the front surface10sand the region in which the semiconductor chip20is provided on the front surface10s.

Here, between the regions in which the electrodes13are provided on the front surface10sand the region in which the semiconductor chip20is provided on the front surface10s,for example, an insulation member60such as a resist is formed on the front surface10s.The insulation member60is interposed between the front surface10sand the wires30when viewed in the first direction and is interposed between the semiconductor chip20and the electrodes13when viewed in the second direction.

The wires30extend from the electrodes13toward the electrodes21and electrically connect the mounting substrate10and the semiconductor chip20to each other by connecting the electrodes13and the electrodes21to each other. As described above, the wires30are integrated by being respectively joined to the bonding portions51on the electrodes13and the bonding portions52on the electrodes21. For example, the wires30are made of a metal such as gold. Each of the wires30includes a first part31, a first bent portion41, a second part32, a second bent portion42, and a third part33arranged in order from the electrode13toward the electrode21.

Here, the first part31and the second part32are connected to each other with the first bent portion41therebetween, and the second part32and the third part33are connected to each other with the second bent portion42therebetween. Namely, here, the wire30is constituted of the first part31, the first bent portion41, the second part32, the second bent portion42, and the third part33. The wire30is joined to the bonding portion51(joined to the electrode13with the bonding portion51therebetween) in the first part31and is joined to the bonding portion52(joined to the electrode21with the bonding portion52therebetween) in the third part33.

The first part31is constituted of a base end portion31ajoined to the electrode13with the bonding portion51therebetween, a tip portion31cconnected to the second part32, and a bent portion31bconnecting the base end portion31aand the tip portion31cto each other. Here, the base end portion31aextends from the electrode13toward a side opposite to the front surface10s(here, the upper side) and reaches the bent portion31b. The bent portion31bis bent such that it protrudes to a side opposite to the front surface10s.The tip portion31cobliquely extends such that it approaches the front surface10sas it is separated from the bent portion31b,and the tip portion31creaches the second part32. The foregoing first part31in its entirety is positioned on the front surface10sside with respect to the front surface20s(here, a side lower than the front surface20s). That is, the first part31is retained on the front surface10sside with respect to the front surface20s.

The first bent portion41is positioned on the front surface10sside with respect to the front surface20swhen viewed in the first direction, is interposed between the first part31and the second part32, and is connected to the first part31and the second part32. The first bent portion41is bent such that it protrudes to the front surface10sside. Accordingly, the first bent portion41converts inclination of the wire30when viewed in the first direction from inclination of approaching the front surface10stoward the electrode21at the tip portion31cof the first part31into inclination of separating from the front surface10stoward the electrode21at the second part32, which will be described below. In other words, the first bent portion41is bent such that the second part32is guided to the front surface20sside. The first bent portion41is positioned on the electrode13side with respect to a center of the wire30in the extending direction of the wire30.

A portion of the second part32on the first bent portion41side is positioned on the front surface10sside with respect to the front surface20s(here, positioned below the front surface20s) when viewed in the first direction, and the remaining portion thereof on the electrode21side protrudes from the front surface20sto a side opposite to the front surface10s(here, positioned above the front surface20s). That is, the second part32extends over the front surface20sfrom the first bent portion41to a side opposite to the front surface10s.As described above, the wire30is inclined such that it is separated from the front surface10stoward the electrode21as the second part32is guided to the first bent portion41.

The second bent portion42is positioned at a position protruding from the front surface20son a side opposite to the front surface10swhen viewed in the first direction (here, positioned above the front surface20s), is interposed between the second part32and the third part33, and is connected to the second part32and the third part33. The second bent portion42is bent such that it protrudes to a side opposite to the front surfaces10sand20s.Accordingly, the second bent portion42converts inclination of the wire30when viewed in the first direction from inclination of separating from the front surface10stoward the electrode21at the second part32into inclination of approaching the front surface20stoward the electrode21at the third part33, which will be described below. In other words, the second bent portion42is bent such that the third part33is guided to the front surface20sside. The second bent portion42is positioned on the electrode21side with respect to the center of the wire30in the extending direction of the wire30.

The third part33protrudes from the front surface20sto a side opposite to the front surface10swhen viewed in the first direction (here, positioned above the front surface20s). That is, the third part33extends toward the front surface20sfrom a position over the front surface20son a side opposite to the front surface10swhen viewed in the first direction and is joined to the bonding portion52(electrode21). As described above, the wire30is inclined such that it approaches the front surface20stoward the electrode21as the third part33is guided to the second bent portion42.

From the above, the wire30in its entirety is bent such that it protrudes to the front surface10sside in the first bent portion41and is bent such that it protrudes to a side opposite to the front surfaces10sand20sin the second bent portion42, thereby extending in an M-shape from the electrode13to the electrode21.

The wire30extends obliquely with respect to the outer edge20eof the semiconductor chip20(inclined with respect to a line orthogonal to the outer edge20e) when viewed in the second direction intersecting the front surfaces10sand20s(inFIG.1(a)). However, the wire30may extend parallel to a line orthogonal to the outer edge20eof the semiconductor chip20when viewed in the second direction.

The resin portion M is provided on the front surface10sover a top surface (front surface20s) of the semiconductor chip20. Accordingly, the semiconductor chip20and the wire30in their entirety are sealed by the resin portion M. For example, a material of the resin portion M is silicone, epoxy, or the like.

Subsequently, a manufacturing method for the foregoing semiconductor device1will be described.FIGS.3to5are schematic cross-sectional views illustrating steps of the manufacturing method for a semiconductor device for manufacturing the semiconductor device illustrated inFIG.1. In this manufacturing method, as illustrated inFIG.3(a), first, the mounting substrate10, the semiconductor chip20mounted on the front surface10sof the mounting substrate10, and at least base materials30A for the wires30are prepared (Step S101, a first step). For example, each of the base materials30A is formed to have a wire shape using a metal such as gold. The base material30A is held by (inserted through) a capillary C included in a device for wire bonding.

Subsequently, as illustrated inFIGS.3(a) to3(c), the capillary C is moved to the electrode21that is the second joint point, and the bonding portion52is formed in the electrode21by joining a tip30Aa of the base material30A caused to protrude from the capillary C to the electrode21and cutting the tip30Aa thereafter (Step S102, a fifth step). More specifically, in this Step S102, first, a wire ball is formed by melting the tip30Aa of the base material30A caused to protrude from the capillary C. Subsequently, the wire ball is pressed against the electrode21while heat or ultrasonic waves are applied thereto. Accordingly, the bonding portion52is formed from the wire ball. Thereafter, the bonding portion52is cut off from the base material30A.

In the succeeding step, as illustrated inFIGS.4(a) and4(b), the capillary C holding the base material30A is moved to a position on the electrode13, and a new tip30Aa of the base material30A caused to protrude from the capillary C is joined to the electrode13that is the first joint point (Step S103, a second step). More specifically, in this Step

S103, first, a wire ball is formed by melting the tip30Aa of the base material30A caused to protrude from the capillary C. Thereafter, the wire ball is pressed against the electrode13while heat or ultrasonic waves are applied thereto. Accordingly, as illustrated inFIG.4(c), the bonding portion51is formed, and ball bonding is performed.

Subsequently, as illustrated inFIGS.4(c),5(a) to5(c), the capillary C is moved while the base material30A is drawn from the capillary C and while the base material30A is caused to have a tendency, and the first part31, the first bent portion41, the second part32, the second bent portion42, and the third part33arranged in order are formed (Step S104, a third step).

Further, as illustrated inFIG.5(c), the capillary C is moved to a position on the electrode21, and the base material30A is joined to the electrode21, thereby constituting the wire30extending from the electrode13to the electrode21(Step S105, a fourth step). More specifically, here, the base material30A is pressed against the bonding portion52at an edge part of the tip portion of the capillary C, and the base material30A is joined to the bonding portion52by applying heat or ultrasonic waves thereto. Thereafter, the base material30A is cut (stitched). Accordingly, stitch bonding is performed. Thereafter, the resin portion M is provided, and the semiconductor device1is thereby obtained.

As described above, in the semiconductor device, the wires30for electrically connecting the mounting substrate10and the semiconductor chip20mounted on the mounting substrate10to each other are provided. The wires30connect the electrodes13on the front surface10sof the mounting substrate10on which the semiconductor chip20is mounted and the electrodes21on the front surface20sof the semiconductor chip20to each other. Each of the wires30includes the first part31, the first bent portion41, the second part32, the second bent portion42, and the third part33arranged in order from the electrode13toward the electrode21(from the mounting substrate10toward the semiconductor chip20).

The first part31is a part extending from the electrode13(bonding portion51) in the wire30and is positioned on the front surface10sside with respect to the front surface20s(for example, below the front surface20s). In addition, the third part33is a part joined to the electrode21(bonding portion52) in the wire30and is positioned at a position over the front surface20son a side opposite to the front surface10s(for example, above the front surface20s). The second part32is a part between the first part31and the third part33and extends over the front surface20sfrom a position on the front surface10sside.

According to such a structure, a resin of the resin portion M is disposed between the wires30and the mounting substrate10. On the contrary, regarding the wires30, the first bent portion41between the first part31and the second part32is positioned on the front surface10sside with respect to the front surface20sand is bent such that the second part32is guided to the front surface20sside. Namely, compared to a case of having no first bent portion41, the wire30(that is, the first part31) extends to the front surface10sside until it reaches the first bent portion41. In the meantime, after it reaches the first bent portion41, the wire (that is, the second part32) extends over the front surface20s.Namely, compared to a case of having no first bent portion41, the wire30extends along edge portions formed by the mounting substrate10and the semiconductor chip20. As a result, an amount of resin held by the wire30is reduced. Thus, according to this semiconductor device1, stress applied to the wire30according to a thermal cycle can be reduced, and degradation in reliability can be curbed.

In the semiconductor device1, the wire30is bent at a position over the front surface20sin the second bent portion42between the second part32and the third part33, and the third part33is guided to the front surface20sside. Further, the third part33extends from a position over the front surface20stoward the front surface20sand is joined to the electrode21(bonding portion52). For this reason, compared to a case in which the second bent portion42and the third part33are not provided and the second part32extends from the front surface10sside and is directly joined to the electrode21(bonding portion52), a situation in which the wire30comes into contact with an edge portion of the semiconductor chip20is avoided. Thus, degradation in reliability can be further curbed.

In addition, in the semiconductor device1, the first bent portion41is positioned on the electrode13side with respect to the center of the wire30in the extending direction. For this reason, the first bent portion41is formed at a position comparatively away from the semiconductor chip20. As a result, for example, when the first bent portion41is formed as illustrated inFIG.5(a), a situation in which a holding tool (for example, the foregoing capillary C) for holding the wire30comes into contact with the semiconductor chip20is curbed.

Moreover, in the semiconductor device1, the wire30extends obliquely with respect to the outer edge20eof the semiconductor chip20when viewed in the second direction intersecting the front surfaces10sand20s.For this reason, compared to a case in which the wire30is perpendicular to the outer edge20eof the semiconductor chip20, it is easy to secure a long length of the wire30. As a result, it is easy to realize the foregoing structure of the wire30including a plurality of parts and a plurality of bent portions.

In the semiconductor device1, between the regions in which the electrodes13are provided on the front surface10sand the region in which the semiconductor chip20is provided on the front surface10s,the insulation member60such as a resist is formed on the front surface10s.For example, the insulation member60may be used for the purpose of forming a pattern of the mounting substrate10or insulation between wirings on the front surface10s.However, it also contributes to reduction of the amount of resin held by the wire30by being interposed between the front surface10sand the wires30. Thus, in the semiconductor device1, degradation in reliability is more reliably curbed.

In addition, according to the manufacturing method for a semiconductor device of the present embodiment, the semiconductor device1described above is manufactured. That is, a semiconductor device capable of curbing degradation in reliability is obtained. Particularly, the manufacturing method for a semiconductor device according to the present embodiment includes Step S102of moving the capillary C to the electrode21and forming the bonding portion52in the electrode21by joining the tip30Aa of the base material30A caused to protrude from the capillary C to the electrode21and cutting the tip30Aa thereafter, after Step S101and before Step S103. At this time, in Step S105, the base material30A is joined to the electrode21with the bonding portion52therebetween. As a result, when the tip of the base material30A protruding from the capillary C is joined to the electrode21after each of the portions of the wire30is formed, the bonding portion52which has already been formed in the electrode21is interposed therebetween, and thus an impact to the semiconductor chip20side is reduced. Particularly, here, since the bonding portion52is formed using the capillary C and the base material30A for forming each of the portions of the wire30, simplification the steps is achieved.

The foregoing embodiment has described an aspect of the present disclosure. Therefore, the present disclosure is not limited to the foregoing embodiment and may be arbitrarily deformed. As an example, the semiconductor device1according to the foregoing embodiment may be deformed in accordance with the distance D between the semiconductor chip20and the electrode13or the height T of the semiconductor chip20. Subsequently, modification examples of the semiconductor device1according to the foregoing embodiment will be described.

FIG.6is a view illustrating the semiconductor device according to a first modification example.FIG.6(a)is a schematic cross-sectional view, andFIG.6(b)is an enlarged photograph. In the example illustrated inFIG.6, compared toFIG.1, the distance D between the electrode13and the semiconductor chip20is increased. In such a case, the length of the first part31extending to the front surface10sside with respect to the front surface20scan be relatively increased by positioning the first bent portion41on the semiconductor chip20side. Accordingly, the first bent portion41is positioned on the electrode21side with respect to the center of the wire30in the extending direction. Here, from among the first part31, since the tip portion31cwhich is positioned on the second part32side with respect to the bent portion31bis extended, the first bent portion41is positioned on the electrode21side.

According to the foregoing first modification example, the first bent portion41is formed at a position comparatively closer to the semiconductor chip20. As a result, a relatively long part of the wire30extending to the front surface10sside (first part31) is secured so that the amount of resin held by the wire30is further reduced. That is, stress applied to the wire30can be reliably reduced, and degradation in reliability can be reliably curbed.

FIG.7is a view illustrating the semiconductor device according to a second modification example.FIG.7(a)is a schematic cross-sectional view, andFIG.7(b)is an enlarged photograph. In the example ofFIG.7, compared toFIG.1, the height T of the semiconductor chip20is increased. Here, a third bent portion43and a fourth part34are interposed between the first part31and the first bent portion41. The third bent portion43and the fourth part34are arranged in this order in a direction from the electrode13toward the electrode21.

The third bent portion43and the fourth part34are positioned on the front surface10sside with respect to the front surface20s.The third bent portion43is connected to the first part31and the fourth part34. The third bent portion43is bent such that it protrudes to the front surface10sside. That is, the third bent portion43is bent such that it protrudes in the same direction as the first bent portion41. Accordingly, the third bent portion43converts inclination of the wire30when viewed in the first direction from inclination of approaching the front surface10stoward the electrode21at the tip portion31cof the first part31into inclination of separating from the front surface10stoward the electrode21at the fourth part34, which will be described below. In other words, the third bent portion43is bent such that the fourth part34is guided to the front surface20sside.

The fourth part34obliquely extends such that it is separated from the front surface10stoward the electrode21so as to connect the first part31and the first bent portion41to each other. Here, since the first bent portion41is positioned on the electrode21side by the amount of length of the fourth part34, the first bent portion41is positioned on the electrode21side with respect to the center of the wire30in the extending direction. However, the first bent portion41may be positioned at the center of the wire30in the extending direction or on the electrode13side with respect to the center in accordance with the length of the fourth part34.

In this example, the inclination direction of the wire30does not change on front and rear sides of the first bent portion41(that is, the fourth part34and the second part32). That is, here, the first bent portion41is bent such that it protrudes to the front surface10sside so as to maintain the inclination of separating from the front surface10stoward the electrode21in the fourth part34in the second part32as well.

According to the foregoing second modification example, since the height T of the semiconductor chip20from the front surface10scan be secured by at least two parts such as the second part32and the fourth part34, sharp bending in which concentration of stress is likely to occur is no longer necessary. Thus, degradation in reliability can be more reliably curbed.

FIG.8is a view illustrating the semiconductor device according to a third modification example.FIG.8(a)is a schematic cross-sectional view, andFIG.8(b)is an enlarged photograph. In the example illustrated inFIG.8, an angle of bending of the bent portion31bof the first part31is increased compared to the example inFIG.1. More specifically, the bent portion31bis bent at a right angle such that the base end portion31aextending perpendicular to the front surface10sand the tip portion31cextending parallel to the front surface10sare connected to each other.

According to such a third modification example, the first part31extends from the electrode13along the front surface10sso that the amount of resin held by the wire30can be further reduced. That is, stress applied to the wire30can be reliably reduced, and degradation in reliability can be reliably curbed.

In the foregoing semiconductor device1, an example in which the bonding portion52is provided on the front surface20sof the semiconductor chip20and the wire30is joined to this bonding portion52has been described. For example, such a bonding portion52can be installed using the same material as the wire30prior to arrangement of the wire30as described above. However, in the semiconductor device1, the bonding portion52is not essential, and the wire30may be directly joined to the semiconductor chip20. In addition, even when the bonding portion52is provided, the bonding portion52may be separately provided by a device different from the wire bonding device for the wire30.

Moreover, in the semiconductor device1, the positions of the bonding portions51and52may be arbitrarily set. Therefore, inclination of the wire30with respect to the outer edge20eof the semiconductor chip20may also be arbitrarily set in accordance with the positional relationship between the bonding portions51and52(electrodes13and21) when viewed in the second direction.

INDUSTRIAL APPLICABILITY

A semiconductor device and a manufacturing method for a semiconductor device capable of curbing degradation in reliability are provided.

REFERENCE SIGNS LIST