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Identifying mosfets

Discussion in 'Troubleshooting and Repair' started by 70jeeper, Feb 10, 2013.

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  1. 70jeeper


    Feb 10, 2013
    Hey guys, I have a Nicad battery charger built by Victor Engineering in the early to mid 90's. I found a mosfet that burnt up but the manufacture sanded the numbers off of all the major componets. How can I identify a mosfet without numbers? There is 4 other mosfets that I believe to be the same, but no numbers!:mad: Just hope someone on here with more knowledge then me can help me out. Any help would be greatly appreciated. Thanks again, Mike
  2. 70jeeper


    Feb 10, 2013
    Would this question have been more suitable for one of the other forums topics.
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Here is good enough :)

    Without part numbers, or a schematic, you'll need to draw a schematic, then determine what the mosfets are doing and what the important characteristics are.

    Fortunately, mosfets have gotten better in the last decade, so it should be relatively easy to find a part that can be used as long as the design is not too exotic or reliant on particular characteristics of the device.
  4. shrtrnd


    Jan 15, 2010
    Did you Google the manufacturer and the model number to try to get a schematic?
    If the manufacturer didn't leave the part numbers on the components, they probably
    didn't want anybody fixing the instrument themselves, so they may not be willing to
    help, but an option is to contact them and ask them.
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