Motorola have had this problem with RF power transistors several years ago.

In that case the "M" logo had differences and if I remember right they all
had the same date code.



Rex


----- Original Message -----
From: "Russell McMahon" <apptech@CLEAR.NET.NZ>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: 30 September 2000 11:57
Subject: [EE]: Bogus Motorola Power Transistors


> Knew I'd find somewhere to use that word sooner or later.
>
>
> A local distributor advises that they had been sold a batch of counterfeit
> Motorola Power Transistors.
> I guess these may pop up all over.
> Sounds like a typical BMW or Compaq April Fools day stunt but apparently
> this is serious:
>
>
> Type MJ10012, MJ15003, MJ15004
> All TO3 Steel cans.
>
> All parts purport to be made in Mexico
>
> This is the biggest give-away.
> Real parts have writing on can running along lines parallel with a line
> drawn between the two pins.
> Bogus parts have writing running along a line drawn between the two
mounting
> holes.
>
> Real parts have square edges can at top of can.
> Bogus parts MAY have rounded edge can and/or bulged top.
>
> Real parts have thick bold lettering
> Bogus generally have thinner lettering.
> Some bogus parts have Mexico mis-spelt as "MEXI9O"
>
> Real parts have 5mm pads epoxy around pins
> Bogus parts have 3 to 4mm epoxy pads around pins.
> You're getting desperate if you have to use this to tell the difference
!!!
> :-)
>
>
> BOGUS:
> MJ10012    Batch 9135,
> MJ15003    Batches 9606, 9632
>
>
>
>
> After  all that typing it would be interesting to hear if anyone actually
> comes across any of these parts OR if anyone cares :-)
>
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