Re: did anyone actually try this MPS6550?

On Sat, Dec 29, 2018 at 7:33 PM <silverdr@wfmh.org.pl> wrote:

&gt; I lost count how many times I bought "NOS" parts, which were
typical "refurbished" stuff: sanded, acid-cleaned, pins straightened
and freshly tinned, upper casing surface painted/stamped. The good
thing is that they mostly work as expected but it's of course a
lottery. Not that they would surely work if they were really NOS..

when I write "counterfeit" I mean really different parts, not
"cleaned" pulls or something similar that can work in place of the
original part. In the case I've cited, the received mosfets had
different pinout (D-G swapped) and very different characteristics
also, gate capacitance was 20-30 times the original one, so turn-on
and off times were way off. Channel on-resistance also was
different... so unusable in place of the originals (even if one
dreamed of adapting the pinout on a 30 MHz amplifier...).
I wouldn't mean testing my luck on 40-years-old NOS parts, but if
they're something different with just a part number added on the case,
then there's no point in risking.

Frank