BOSCH Part #1012 - Coil Drive Transistor

[Jeff Webb]

944 at technologist.com wrote:
> 
> Many Motronics use BOSCH Part #1012 as its coil drive transistor. It is a
> "selected" or "special" part for some reason? It appears to be just a NPN
> Switching Transistor. Nothing special??????
> 
> It is probably "selected" for a low VCEsat. This reduces the internal power
> dissipation on the transistor. Maybe speed "selected" too? Maybe a
> substitute does not have to be so special? Has anyone put it on a curve
> tracer or have data on it's specifications?
> 
> What substitutes have others been using for this part? As usual, thanks in
> advance....

I haven't played with ignition yet, but I was planning on using an IGBT
like the OnSemi MGP20N40CL.  It's designed for driving ignition coils,
so take a look at the datasheet.  I haven't tried it yet, so I can't say
more.  Maybe someone with some experience will share their knowledge.

Jeff Webb
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