Miniature moldlocks for heatsink or flag for an overmolded plastic package
View Patent ↗A system of mold locks ( 28, 30 ) is formed on a heatsink ( 2 ) of a packaged semiconductor to prevent/mitigate delamination. The mold locks ( 4, 12 ) anchor a plastic mold compound ( 34 ) that forms the protective cover for the packaged semiconductor die. The mold locks ( 4, 12 ) are miniaturized to allow the positioning of them within the flag portion of the heatsink ( 2 ) and leadframe ( 24 ) such that a semiconductor die can be anchored above the mold locks ( 4, 12 ) formed within the flag portion of the heatsink/lead frame ( 2, 24 ). The miniaturized size of the said moldlocks ( 4, 12 do not detract from the purpose of the die attach solder ( 36 ).
1. A microchip structure to prevent delamination, comprising;
a mold lock, comprising:
a primary channel;
a secondary channel formed above said primary channel; and
a dovetail profile protruding into said primary channel from a wall of said primary channel;
a row of said mold locks formed along an outer edge of a heatsink of said microchip structure; and
a pattern of said mold locks formed within a flag area of said heatsink.
2. The microchip structure to prevent delamination of claim 1 , wherein said pattern is a row.
3. The microchip structure of claim 1 , wherein said primary channel has a depth of less than 0.012 inches.
4. The microchip structure of claim 1 , wherein said secondary channel has a depth of less than 0.008 inches.
5. The microchip structure to prevent delamination of claim 1 , wherein said mold locks formed within the flag area of said heatsink are coupled to a plastic mold compound.
6. The microchip structure to prevent delamination of claim 1 , wherein said mold locks formed within the flag area of said heatsink are coupled to a soldering compound.
7. A packaged semiconductor, comprising:
a mold lock having a primary channel and a dovetail profile protruding into said primary channel from a wall of said primary channel;
a heatsink having a row of said mold locks formed along an outer edge of said heatsink and a pattern of said mold locks formed in an interior portion of said heatsink; and
a plastic mold compound coupled to said mold locks formed along the outer edge of said heatsink.
8. The packaged semiconductor of claim 7 , further comprising a secondary channel formed above said primary channel.
9. The packaged semiconductor of claim 8 , wherein said primary channel has a depth of less than 0.012 inches.
10. The packaged semiconductor of claim 9 , wherein said secondary channel has a depth of less than 0.008 inches.
11. The packaged semiconductor of claim 7 , wherein a soldering compound is coupled to said pattern of mold locks.
12. The packaged semiconductor of claim 7 , wherein said plastic mold compound is coupled to said pattern of mold locks.
13. A microchip structure to prevent delamination, comprising;
mold lock means formed in a heatsink to anchor a compound to said heatsink,
wherein said mold lock means comprising:
primary channel means to receive said compound; and
dovetail profile means to anchor said compound to said mold lock means;
a row of said mold lock means formed along an outer edge of said heatsink; and
a pattern of said mold lock means formed within the flag area of said heatsink.
14. The microchip structure to prevent delamination of claim 13 , wherein said pattern is a row.
15. The microchip structure to prevent delamination of claim 13 , wherein said primary channel means has a depth of less than 0.012 inches.
16. The microchip structure to prevent delamination of claim 13 , wherein compound is a plastic.
17. The microchip structure to prevent delamination of claim 13 , wherein said compound is a solder.
18. The microchip structure to prevent delamination of claim 13 , wherein said mold lock means further comprises secondary channel means formed above said primary channel means to form said dovetail profile means.
19. The microchip structure to prevent delamination of claim 18 , wherein said secondary channel means has a depth of less than 0.008 inches.