JP-WO2025192057-A5 -

Dates

Publication Date

20260508

Application Date

20250127

Description

Let L1 be the distance between solder resist 71 and solder resist 72 along the X direction, and let L2 be the width of the semiconductor chip 3a. Also, let w1 be the width of the gate electrode 31 along the X direction, and let d1 be the width of the area occupied by the lower end of the pin terminal 51a relative to the gate electrode 31. Similarly, let w1 be the width of the source electrode 32 along the X direction, and let d1 be the width of the area occupied by the lower end of the pin terminal 52a relative to the source electrode 32. The width d1 may be the diameter of the pin terminals 51a and 52a. Then, L1, L2, w1, and d1 satisfy the relationship (L1 - L2) < (w1 - d1). (L1 - L2) is the distance that the semiconductor chip 3a is allowed to move along the X direction, that is, the play of the semiconductor chip 3a along the X direction. (w1-d1) is the distance that is allowed for movement of the gate electrode 31 and source electrode 32 relative to the pin terminals 51a and 52a along the X direction, i.e., the play of the gate electrode 31 and source electrode 32 along the X direction. By making the play of the semiconductor chip 3a smaller than the play of the gate electrode 31 and source electrode 32, even if the semiconductor chip 3a moves along the X direction during reflow, it is possible to suppress the opening of the junction between the pin terminal 51a and the gate electrode 31, and to suppress the opening of the junction between the pin terminal 52a and the source electrode 32. As shown in Figure 5, along the Y direction, the distance between solder resist 73 and solder resist 74 is L3, and the width of the semiconductor chip 3a is L4. Along the Y direction, the width of the gate electrode 31 is w2, and the width of the area occupied by the lower end of the pin terminal 51a relative to the gate electrode 31 is d2. Similarly, along the Y direction, the width of the source electrode 32 is w2, and the width of the area occupied by the lower end of the pin terminal 52a relative to the source electrode 32 is d2. Then, L3, L4, w2, and d2 satisfy the relationship (L3 - L4) < (w2 - d2). (L3 - L4) is the distance that the semiconductor chip 3a is allowed to move along the Y direction, i.e., the play of the semiconductor chip 3a along the Y direction. (w2 - d2) is the distance that the gate electrode 31 and source electrode 32 are allowed to move relative to the pin terminals 51a and 52a along the Y direction, i.e., the play of the gate electrode 31 and source electrode 32 along the Y direction. By making the play in the semiconductor chip 3a smaller than the play in the gate electrode 31 and source electrode 32, even if the semiconductor chip 3a moves along the Y direction during reflow, it is possible to suppress the opening of the junction between the pin terminal 51a and the gate electrode 31, and to suppress the opening of the junction between the pin terminal 52a and the source electrode 32.