In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bfranke wrote:

Alexander,

I did a some searching and found your part.  It looks like it is a FMMT489 medium power transistor made by Zetex.  Digikey sells these for 41 cents.  You know, Jon is right, don't mess with it unless your sure they won't cover it under warranty.  If your "mistake" was caused by high voltage, it is very probable that it took out another part.  If it was caused by high current, such as a dead short somewhere, it might very well be just this transistor that is bad.  I haven't drawn out the circuit, so it's a guess on my part (but only a guess) that this transistor is the final driver for the programming voltage since it is a power transistor.   Anyway consider this before you pay Digikey's $25 minimum charge.

Bill

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