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Electronic Schematics (alt.binaries.schematics.electronic) A place to show and share your electronics schematic drawings. |
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#1
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repost: former fets - ExFets.jpg
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#2
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repost: former fets - ExFets.jpg
In message , John Larkin
writes [ A UUEncoded file (ExFets.jpg) was included here. ] Brings back memories. Wish I'd got pics from when I used to repair PSUs. One PSU (DEskpro 386N IIRC) used two IRFP450 FETs mounted on some nice 3/16" (approx) thick aluminium heatsinks. These devices have a failure mode that shoots molten metal out of the back of the FET package through the copper back and clean through the thermal pad and heatsink as well, welding itself to the heatsink in the process. We used to be *very* careful when powering these up after a repair. Clint Sharp |
#3
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repost: former fets - ExFets.jpg
On Tue, 15 May 2007 19:36:48 +0100, Clint Sharp
wrote: In message , John Larkin writes [ A UUEncoded file (ExFets.jpg) was included here. ] Brings back memories. Wish I'd got pics from when I used to repair PSUs. One PSU (DEskpro 386N IIRC) used two IRFP450 FETs mounted on some nice 3/16" (approx) thick aluminium heatsinks. These devices have a failure mode that shoots molten metal out of the back of the FET package through the copper back and clean through the thermal pad and heatsink as well, welding itself to the heatsink in the process. We used to be *very* careful when powering these up after a repair. Clint Sharp I've seen TO-3's with holes burned through the metal can top. Wish I'd taken pics. John |
#4
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repost: former fets - ExFets.jpg
"Clint Sharp" wrote in message
In message , John Larkin writes [ A UUEncoded file (ExFets.jpg) was included here. ] Brings back memories. Wish I'd got pics from when I used to repair PSUs. One PSU (DEskpro 386N IIRC) used two IRFP450 FETs mounted on some nice 3/16" (approx) thick aluminium heatsinks. These devices have a failure mode that shoots molten metal out of the back of the FET package through the copper back and clean through the thermal pad and heatsink as well, welding itself to the heatsink in the process. We used to be *very* careful when powering these up after a repair. Sounds like a shaped charge anti-armor weapon. -- Reply in group, but if emailing add another zero, and remove the last word. |
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