If you were able to measure RDSon and both the breakdown voltages, it
wouldn't be hard to search the likes of digikey and mouser for similar
parts. Sure you may have to destroy one or two doing that sort of testing,
but it should get you a lot better idea of what you have.

Are there other "easily" measurable parameters that Bob could use to narrow
his search?


On Tue, Feb 2, 2016 at 2:18 PM, Bob Blick <bobblick@ftml.net> wrote:

> I have a couple hundred mosfets in SOT-23 package that are marked B22D.
> I haven't been able to track them down. Only mosfets I can find with
> B-number-number markings are from SinoPowerSemi but none of theirs have
> a 22.
>
> What I've been able to discern from experimenting is that they are
> P-channel, logic level, "4.5V" but definitely not 1.8 or 2.5 v logic,
> because the gate threshold is about 1.3 volts at room temperature.
>
> Anybody come across something like this before? Looking for a datasheet,
> mostly I'm curious about the gate voltage maximum for them.
>
> Definitely not AO3415A, which is what they were sold to me as :(
>
> Thanks!
>
> Bob
>
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