Maybe this helps. No luck finding a datasheet that matches the marking.

http://www.aliexpress.com/item/APM2307-B22D-original-new-P-Channel-Enhancem=
ent-Mode-MOSFET-SOT23/32248715161.html

APM2307 B22D original new P-Channel Enhancement Mode MOSFET SOT23

-----Original Message-----
>From: Bob Blick <bobblick@ftml.net>
>Sent: Feb 2, 2016 2:18 PM
>To: piclist@mit.edu
>Subject: [EE] P-MOSFET marked B22D
>
>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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