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I have a 6 year old top load washing machine which requires a TRIAC replacement for wash motor. The actual TRIAC that came with factory PCB board is NXP BT138X-800 and the one I am looking to replace with is BT139-800E. These are passivated, sensitive gate triacs and from the datasheets I can see some differences in characteristics specifically under IGT(gate trigger currents) and IL(Latching currents).

The wash motor is connected with a capacitor and then to a TRIAC on to the PCB board. Here is the tech specs for

Wash Motor 220-240V 50HZ 125W 1.28A 4P

Capacitor Rated on motor plate: 11uF/450VAC IPOO ClASS B

Currently using EPCOS LCAP 10uF +5/-0% with Inductor coil 110uH +/-7% Part No - B32350 (450VAC P0)

Note: EPCOS product sheet has mentioned 3 other TRIAC parts like ACST1235, ACST1035, BTA12-800CW but as of now I couldn't find them nearby.

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No, you can't because the BT138X-800 has an isolated tab. The BT139-800E has not.

The BT138X-800 is also selected as less sensitive by purpose, to prevent misfiring in a high electrical noise environment.

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  • \$\begingroup\$ Thanks for the reply. Yes, you're right I just double checked and there is no inter-connected metal tab for BT138X-800 compared to BT139-800E. I found another model BT138-600E mouser.com/datasheet/2/302/BT138-600E-211638.pdf I think its close except the voltage, do you think it will be a good replacement? \$\endgroup\$
    – Dee
    Commented Apr 28, 2021 at 7:24
  • \$\begingroup\$ how can you tell BT138X-800 is less sensitive? I see BT139 says "Passivated, sensitive gate triacs" but that is just at the front page of the datasheet, might be marketing stuff again \$\endgroup\$
    – Christianidis Vasilis
    Commented Apr 28, 2021 at 7:42
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    \$\begingroup\$ Hi @ChristianidisVasileios if you can check both the datasheets under features section there it is clearly mentioned "Less sensitive gate for improved noise immunity"(for BT138X) and "High sensitivity in all four quadrants."(for BT139). So I am not sure it is a marketing stuff or something else to be checked. However Janka is right on that point. \$\endgroup\$
    – Dee
    Commented Apr 28, 2021 at 7:57
  • \$\begingroup\$ Oops sorry @Janka I forgot to mention BT138-600E also has a mounting base and not isolated. \$\endgroup\$
    – Dee
    Commented Apr 28, 2021 at 8:37
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    \$\begingroup\$ BT139X-800 should do fine in your application. \$\endgroup\$
    – Janka
    Commented Apr 29, 2021 at 12:54

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