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Originally Posted by Tom F
Well power devices can usually withstand higher temperatures then say, a big chip like a CPU or something (usually a max junction temp of 120ºC+)
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Yeah, but the current spikes from a BL setup are very quick and any internal protection circuitry may not respond fast enough. Besides, I would NEVER want any electronic device I owned to get that hot! 120ºC is 248ºF!! Yikes.
If several FETs are bad, all that current load is being forced through what is left. The FETs have a low resistance, but this is reduced when you have several in parallel. With fewer available, there is more total resistance which creates a voltage drop and power loss, hence the heat.