Help identify this power mosfet

Discussion in 'Electronics Resources' started by bobbyrae, Dec 28, 2010.

  1. bobbyrae

    Thread Starter Active Member

    May 14, 2009
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    Obviously the brand is ST. But the blast from the capacitor that went bad burned a spot on the model number! My first guess is STW11NB80. It is a TO-247 package.

    For your info, it comes from an ATX PC power supply made in 2003. 480 watts.

    Any other possibilities? If that's it, the next step would be to find an equivalent replacement since it is an obsolete part.
     
  2. retched

    AAC Fanatic!

    Dec 5, 2009
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    Is that the only one on the board?
     
  3. jpanhalt

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  4. bobbyrae

    Thread Starter Active Member

    May 14, 2009
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    It's really tight in there. There are 2 heat sinks with similar components bolted onto them. At least 4 other transistors. I can't tell what they are without taking a lot of stuff out. If you are suggesting that I replace ALL of them, well... that would be VERY hard. And there is no evidence that the others are bad.

    If you suggesting that there is another that would be identical... OK, that's a thought I had too, but like I say, it is so tight in there you just can't see those things without taking a lot of stuff out first. The one that looks like it might be the same is on the other side of the heat sink and right up against the main transformer. The transfomer would have to be removed and that looks like at least five solder points.

    In a way I am lucky that it failed the way it did because all the failed stuff (fuse, caps, transistor) were easy to get at.
     
  5. retched

    AAC Fanatic!

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    I was just suggesting reading the number off a similar MOSFET.

    The B80 is all over ST's website.

    Its a 55v 80A jammie, from what I can tell.
     
    Last edited: Dec 28, 2010
  6. bobbyrae

    Thread Starter Active Member

    May 14, 2009
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  7. bobbyrae

    Thread Starter Active Member

    May 14, 2009
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    Really? All I get is "no such product exists!" when I search at the ST site, So could you give a link? I found the datasheet at other places like Digikey. But it's an 800V, 11A power MOSFET, not a "jammie".
     
  8. retched

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    Last edited: Dec 28, 2010
  9. thatoneguy

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    Feb 19, 2009
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    No, that doesn't work. for me (no cookies)

    To the OP: a 2003 Power Supply won't be much use if you upgrade your motherboard or video card. You may be better off upgrading and getting speedy processor and graphics with a new power supply. A new supply that size is around $40 or less.
     
  10. bobbyrae

    Thread Starter Active Member

    May 14, 2009
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    Please take a look at the photo. The model number starts with STW1 and ends with B80. So it is STW<missing digits>B80, which clearly does not match anything in the link you gave.

    And I have no idea what is meant by "jammie".
     
  11. bobbyrae

    Thread Starter Active Member

    May 14, 2009
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    I didn't start this discussion to consider computer upgrade options. Of course you can always find cheapo power supplies! So what? That is not what we are talking about, OK?
     
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