Hi,

I want to id the 7 power transistors in an IEC centrifuge. Three of
them visible here.
http://easthope.ca/CentrifugePowerTransistors.jpg

Each small increment on the scale is 1 mm. The plastic case is about
15 mm wide by 20 mm high. Usually the metal cooling plate on the back
of a transistor would project above the plastic. Not so here. About
half the black plastic case is beneath the p.c.b. in this photo. The
grey material in the photo appears to be a silicone impregnated cloth
for heat transfer. The black panel above is an aluminum cooling fin
and folds under the transistors.

I failed to find a match with the transistors listed here.
http://www.siliconfareast.com/to-types.htm

Ideas? Thanks, ... Peter E.

TO-247 case.


https://www.vishay.com/docs/95223/to247.pdf

Peter Wieck
Melrose Park, PA

On Wednesday, November 22, 2017 at 10:13:03 AM UTC-8, wrote:
TO-247 case.

https://www.vishay.com/docs/95223/to247.pdf

Thanks! According to
http://www.interfacebus.com/semicond...es-TO-247.html ,
the TO-247 case is used for BJT, FET and SCR. A good start to understanding
the control of the centrifuge.

Thanks again, ... Peter E.