On Thu, Jun 05, 2003 at 11:20:27AM -0800, Robert Smith enlightened us
thusly I don't think so. On the onw I have The collector/emitter reads
like an iron bar, the base/emitter reads ~65 ohms and the base/collector
reads a diode drop one way, and o/c the other. Very Bipolar-ish. Also
the labelling is C,B,&E, not D,G,&S. Have you ever seen a darlington
IGBT? These _are_ darlingtons.
The other possibility is my old friends, the Static Induction Transistor
but I feel not.
This is an old Drive on a milling machine at least fifteen years old.
There were transistor modules then. There is also a tradition of using
difficult to replace items by the Japanese.
> Any chance its an IGBT?? They sometimes tend to resemble a Darlington
> depending on who drew the schematic.
>
> Bob Smith ----- Original Message ----- To: "Multiple recipients of
> list CHIPDIR-L" <[EMAIL PROTECTED]> Sent: Thursday, June 05,
> 2003 10:24 AM
>
>
> > I stuck my nose into a drive from a (Japanese?) Milling Machine, and
> > came out holding a dud transistor module. The Markings are
> >
> > P 50 Z No: 1604
> >
> > They all say No: 1604. The label shows a darlington class B stage
> > made with NPN Bipolar transistors, and with reverse diodes
> > incorporated. It runs from a DC bus. Absolutely no manufacturer's
> > markings or logo, and I smell a spacial part here. It's three phase
> > ~200V phase to phase, so the most believable guess at the '1604' bit
> > would be 160Amps/400Volts
> >
> > Can anyone throw me a bone with this one?
>
--
With best Regards,
Declan Moriarty.
--
Author: Declan. Moriarty
INET: [EMAIL PROTECTED]
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