Help identifying transistor - 2f P

Discussion in 'General Electronics Chat' started by MrSoftware, Nov 19, 2015.

  1. MrSoftware

    Thread Starter Member

    Oct 29, 2013
    497
    122
    Does anyone recognize this transistor (Q29 below), or know which pins are which (gate, source, drain)? Is it even a transistor? It's from an APC 1500 XS UPS, I'm searching for a schematic but so far no luck.

    I made the rookie mistake of accidentally touching a nearby voltage regulator output and ground pins at the same time with my multi meter probe (small parts, shaky hands) and everything immediately turned off. I think I killed the regulator and a few things around it, including this part, so I'm trying to figure out what it is so I can at least test it. The two left pins are showing +24V dc, which is battery voltage on the UPS, the pin on the right side by itself is showing +4V dc. But that right side pin is connected to the near by voltage regulator input pin so I'm wondering if that's supposed to be more than 4V, if everything was working. Back to the schematic hunt!

    temp.PNG
     
  2. dl324

    Distinguished Member

    Mar 30, 2015
    3,233
    619
    The problem with SMD codes is they're not necessarily consistent between manufacturers. Could be BC850B.
    upload_2015-11-19_7-9-19.png
     
    MrSoftware likes this.
  3. MrSoftware

    Thread Starter Member

    Oct 29, 2013
    497
    122
    Thank you!
     
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