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#1
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MOSFET punch-through
Who said power mosfets don't suffer " punch- through" like BJTs do ? Pics are of an Hitachi 2SK176 Nch lateral, 125 watt, 200 volt, 8amp. ........ Phil |
#2
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MOSFET punch-through
Rather extreme punch-through! I was expecting a pic of a hole in the die.
looks like there was an arc that ate a hole from the source pin through the TO3 case. Geez! Weird stuff happens when you have enough voltage and seed a V-field with ions... Oppie "Phil Allison" wrote in message ... Who said power mosfets don't suffer " punch- through" like BJTs do ? Pics are of an Hitachi 2SK176 Nch lateral, 125 watt, 200 volt, 8amp. ....... Phil |
#3
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MOSFET punch-through
Phil Allison wrote:
Who said power mosfets don't suffer " punch- through" like BJTs do ? Pics are of an Hitachi 2SK176 Nch lateral, 125 watt, 200 volt, 8amp. Impressive! How'd you do that? -- Regards, Joerg http://www.analogconsultants.com |
#4
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MOSFET punch-through - ExFets.jpg
On Wed, 19 Sep 2007 19:01:38 +1000, "Phil Allison"
wrote: Who said power mosfets don't suffer " punch- through" like BJTs do ? Pics are of an Hitachi 2SK176 Nch lateral, 125 watt, 200 volt, 8amp. ....... Phil TO-247's don't do that. The plastic just comes off in high-velocity chunks. John |
#5
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MOSFET punch-through - ExFets.jpg
John Larkin wrote:
On Wed, 19 Sep 2007 19:01:38 +1000, "Phil Allison" wrote: Who said power mosfets don't suffer " punch- through" like BJTs do ? Pics are of an Hitachi 2SK176 Nch lateral, 125 watt, 200 volt, 8amp. ....... Phil TO-247's don't do that. The plastic just comes off in high-velocity chunks. Are those the initials of the guilty ones on there? Something like a hall of shame display ...? -- Regards, Joerg http://www.analogconsultants.com |
#6
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MOSFET punch-through
"Joerg" Phil Allison wrote: Who said power mosfets don't suffer " punch- through" like BJTs do ? Pics are of an Hitachi 2SK176 Nch lateral, 125 watt, 200 volt, 8amp. Impressive! How'd you do that? ** Was like that when I found it - inside a 1000 watt per ch power amp. Seems a DC arc started up from the drain pin to the nearest part of the case, eventually self extinguishing when a large enough hole was burnt through. The somewhat overheated drain pin detached from the glass seal leaving the small hole you see in one pic. It's a rare event, but I have seen one other similar example and just one involving a BJT. The trigger event for the DC arc is the bonding wire from the drain or emitter pin fusing. ...... Phil |
#7
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MOSFET punch-through - ExFets.jpg
flipper wrote:
On Wed, 19 Sep 2007 08:42:19 -0700, John Larkin wrote: On Wed, 19 Sep 2007 19:01:38 +1000, "Phil Allison" wrote: Who said power mosfets don't suffer " punch- through" like BJTs do ? Pics are of an Hitachi 2SK176 Nch lateral, 125 watt, 200 volt, 8amp. ....... Phil TO-247's don't do that. The plastic just comes off in high-velocity chunks. John Yeah. Looks, unfortunately, familiar. Oh, you should have seen all the tubes that came to grief in our ham radio power amps back in the 70's. Some of that was really ugly. At least one could usually clean it all up with broom and shovel. -- Regards, Joerg http://www.analogconsultants.com |
#8
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MOSFET punch-through - ExFets.jpg
Joerg wrote: flipper wrote: John Larkin wrote: "Phil Allison" wrote: Who said power mosfets don't suffer " punch- through" like BJTs do ? Pics are of an Hitachi 2SK176 Nch lateral, 125 watt, 200 volt, 8amp. TO-247's don't do that. The plastic just comes off in high-velocity chunks. Yeah. Looks, unfortunately, familiar. Oh, you should have seen all the tubes that came to grief in our ham radio power amps back in the 70's. Some of that was really ugly. At least one could usually clean it all up with broom and shovel. I have a KT88 here somewhere with a *molten* anode. Graham |
#9
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MOSFET punch-through - ExFets.jpg
In message , John Larkin
writes Actually, TO-247s do do that. Compaq 386 PSU with Aluminium case, IRFP450 devices, they used to punch through the metal back plate and also through the heatsink they were attached to, often the molten ejecta solidified and fixed the device firmly to the heatsink. [ A UUEncoded file (ExFets.jpg) was included here. ] -- Clint Sharp |
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