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Triac cross-reference help

Discussion in 'd.i.y.' started by lsinclair, May 31, 2016.

  1. lsinclair

    lsinclair pfm Member

    I've been asked by a friend to fix a faulty motor control board. The only active component is a TO-220 marked


    so that seems a good starting point. I have discovered that an OT239 is an obsolete triac, but can't find any further information. I think I may have found an equivalent - TS820-600T - but it was on a Japanese site so I'm not 100% certain. Would someone be prepared to spend a few minutes confirming for me?

    Also would it be safe to assume both have the usual triac pinout?

    Many thanks
  2. CarrotMan

    CarrotMan pfm Member

    Found a discontinuation notice which lists the OT239 as a "Gen. Purpose Thyristor" (not a triac) and BT258-800R as the recommended replacement. No further information about pin outs etc. but you can easily find the NXP data sheet for the BTR and maybe it's possible to verify that against the board?

  3. lsinclair

    lsinclair pfm Member

    Yes, a thyristor, my mistake. I don't think the BT258 is current either but as I have seen the TS820-600T listed as the nearest equivalent to that as well, that's what I'll try. Many thanks for taking the trouble to confirm.

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