I'm trying to identifiy this component. I assume that it must be some kind of mosfet or bjt. Can someone point me to a Manufacturer Part number or datasheet?

The component is used in the circuit to blow a fuse. Its basicaly a 1-bit memory to permanently store an error condition. SMD component enter image description here

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    \$\begingroup\$ Could the surrounding circuitry make a thyristor a possibility? What is driving it? Eg: BT151 \$\endgroup\$
    – Jeroen3
    Dec 11, 2017 at 7:52
  • \$\begingroup\$ Yes, i think thats a possibility. Its driven by a comparator that detects overtemperatures. \$\endgroup\$
    – Eftio1998
    Dec 11, 2017 at 8:00

1 Answer 1


As mentioned in the comments, this will be a simple Thyristor in a DPAK type package.

The BT151S-500 from WeEn-Semi (now part of NXP) matches the package (SOT428/DPAK), and also the partial part number (151S5).

Snippet from Datasheet


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