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1st January 2012, 01:47 PM
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#1 |
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diyAudio Member
Join Date: Nov 2009
Location: Cape Town
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Interesting BJT failure mode...
It was a low voltage, high current PNP transistor used as the output device in the dimmer circuit for my son's car's dashboard lights. Testing with a multimeter suggests the base is now shorted to the collector and the emitter is totally open circuit.
Some previous owner had screwed up the wiring and connected the output directly to ground, so cause of death will have been overcurrent or overheating. There's no external signs of damage though (like a burned/exploded case). Is this in any way normal? Seems weird to me! |
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1st January 2012, 02:56 PM
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#2 | |
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diyAudio Member
Join Date: Sep 2006
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Quote:
It looks normal to me: first, the junction was melted into a short by the overload, and then the emitter bonding wire acted as a fuse, leaving just B and C shorted
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