I am trying to identify the transistor that fried on this circuit board of a 12 V multi-tool. I can make out CM then JA200. Greatly appreciate any help with ID. I hate throwing things away.


Transistor closeup

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    \$\begingroup\$ Not enuf clues , it could be dozens of parts , find a good board by searching the product teardown or service manual e.g. comchiptech.com/admin/files/product/… \$\endgroup\$ Commented Jan 23, 2022 at 20:39
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    \$\begingroup\$ How about a picture of the whole board so we can get some context. What precipitated the device to fail? Was it stalled? \$\endgroup\$
    – Kartman
    Commented Jan 23, 2022 at 20:41
  • \$\begingroup\$ Are there only two leads attached to the board? (Looks like it to me.) \$\endgroup\$
    – jonk
    Commented Jan 23, 2022 at 20:54
  • \$\begingroup\$ @jonk The tab looks to be connected to a large plane around the perimeter of the board, to me. I don't think that's a separate thing. \$\endgroup\$
    – Hearth
    Commented Jan 23, 2022 at 21:15
  • \$\begingroup\$ @Hearth hard to tell for me. Thanks. \$\endgroup\$
    – jonk
    Commented Jan 23, 2022 at 21:16

1 Answer 1


In general, it is going to be an N-channel MOSFET. Your current MOSFET was obviously under specified so you'll want a better one (lower on-resistance and lower input capacitance would be good this to look for to make a motor-controller MOSFET "better"). I made those assumptions because your chip clearly has thermal failure (you didn't say you dropped it or hit it with a hammer). Here is a good one that can handle many amps at your 12VDC supply with PWM speed control. https://www.digikey.com/en/products/detail/infineon-technologies/IRLR8256TRPBF/2271900 Unfortunately, you'll pay $1 for the part and 7-$12 for shipping.

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    \$\begingroup\$ Thank you ! Part ordered.. I was cutting pipe and in bound up. Before I could shut it off it failed. I was hoping I might be able to upgrade the part. Thanks again. My dad turns over in his grave if I don't fix things rather than throw them away. \$\endgroup\$ Commented Jan 24, 2022 at 21:25
  • \$\begingroup\$ Well I received the transistor and installed it and I get almost no current coming to the motor and the transistor is getting pretty hot. Any thoughts \$\endgroup\$ Commented Jan 28, 2022 at 17:06
  • \$\begingroup\$ @Overcashier I assume this board is to control the speed? Does the motor turn if you connect it directly to the power supply? It may be damaged and that in turn blew the previous MOSFET. \$\endgroup\$ Commented Jan 28, 2022 at 17:28
  • \$\begingroup\$ The motor is seized or a winding inside the motor crapped out. Also, check if your power supply blew when the transistor blew. Or, if it is working, make sure it is not going into "protection mode' when connected to your motor and control board. In protection mode, the power supply gives a small "chirp" of power to make sure there is some load before ramping up to full current. \$\endgroup\$ Commented Jan 28, 2022 at 17:35
  • \$\begingroup\$ Yes the motor works with 9 volts from a power supply. I installed the new transistor as recommended by GT Electronics and read very little current coming to the motor and the new transistor gets very hot \$\endgroup\$ Commented Jan 28, 2022 at 17:38

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