Background
I had a failure on a half bridge driver IC (IRS2304) between pins 7 (HO) and 8 (VB). The driver IC is now fried. I know this because after desoldering, pins 7 and 8 were shorted together. On the PCB however, the impedance on the footprint is still very high, so there wasn’t a complete breakdown in the insulation. You can see some odd markings where the failure might have occurred between these pins. This same fault also damaged my +5V bus but that’s a different story.
Question
What is the name of this fault that probably caused this brown stuff between these two pins? It appears like a burn mark. Has anyone else seen this? Does this particular failure mode have a name?
I had a failure on a half bridge driver IC (IRS2304) between pins 7 (HO) and 8 (VB). The driver IC is now fried. I know this because after desoldering, pins 7 and 8 were shorted together. On the PCB however, the impedance on the footprint is still very high, so there wasn’t a complete breakdown in the insulation. You can see some odd markings where the failure might have occurred between these pins. This same fault also damaged my +5V bus but that’s a different story.
Question
What is the name of this fault that probably caused this brown stuff between these two pins? It appears like a burn mark. Has anyone else seen this? Does this particular failure mode have a name?
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