Lead for connection to a semiconductor device
There is disclosed a lead for connection to a semiconductor device die, the lead comprising a clip portion. The clip portion comprises a major surface having two or more protrusions extending therefrom for connection to a bond pad of the semiconductor device die.
1. A lead for connection to a semiconductor device die, the lead comprising:
a clip portion, said clip portion comprising a major surface having two or more protrusions extending therefrom for connection to a bond pad of the semiconductor device die and at least one through hole extending through said clip portion; and
a solder layer between the clip portion and the bond pad, and wherein the through hole or a cut away portion is arranged to provide ventilation sufficient to prevent gases generated by reflow of the solder layer from becoming trapped underneath the major surface of the clip portion.
2. The lead of claim 1 , wherein said protrusions are formed as elongate ridges extending in parallel across the major surface of the clip portion.
3. The lead of claim 1 , wherein the at least one through hole intersects multiple of the elongate ridges.
4. The lead of claim 3 , wherein the hole extends through a plurality of the ridges.
5. The lead of claim 1 , wherein the at least one through hole is arranged between said protrusions.
6. The lead of claim 1 , wherein the clip portion is bifurcated so at to comprise at least two branches and having a cut away portions there between, wherein each branch of the clip portion comprises at least one protrusion.
7. The lead of claim 1 , further comprising one or more cut away portions disposed at the periphery of the clip portion.
8. The lead of claim 1 , wherein the clip portion is arranged to be flexible.
9. The lead of claim 1 , wherein at least 40% of the area of the clip portion overlaps a contact the area of the semiconductor device die.
10. The lead of claim 1 , further comprising a lead frame connection clip, wherein said lead frame connection clip is distal to said clip portion.
11. The lead of claim 10 further comprising a stepwise formation in an end of the clip portion distal to said lead frame connection clip.
12. The lead of claim 10 further comprising a through hole in said frame connection clip and said clip portion.
13. A semiconductor component comprising the lead of claim 1 .
14. The semiconductor component of claim 13 , wherein the semiconductor component is a power rectifier device or a transient voltage suppression device.
15. The lead of claim 1 , wherein the at least one hole is configured and arranged to allow solder points to be visually inspected from above.
16. The lead of claim 1 , wherein the clip portion further includes one or more cut away portions.
17. The lead of claim 1 , wherein no more than 90% of the area of the clip portion overlaps a contact area of the semiconductor device die.