I need help identifying this power transistor. From what I understand, they must be either NPN bipolar or N-channel FET/IGBTs, because the device is a low side LED-driver with common anode. The maximum voltage is 24V and the transistors probably are capable to switch bigger voltages.

The whole device can switch 75W at24V and there are 4 of these semiconductors, hence each of them should be able to drive 0.75 A at least.

circuit with transistors Sorry for the poor image quality, was done with my old samsung G SII through a scale magnifier.

gate/base is probably the lower left pin. The via leads over a 330 Ohms resistor to the Y of an AND-gate (ACT108) on the other side of the PCB.

I wasn't even able to locate the manufacturer (ViC ????) let alone the device itself (I266DN AE 13) in da intarrnet.

edit I forgot to mention, why I want to know the model of this part, and if possible, the name of the manufacturer. I want to know the reliability of the whole device. There are some electrolyte capacitors which could limit the lifetime, but they aren't in a thermal stressed section and are well oversized. The manufacturer says it has only 20000 hours lifetime, and I was thinking that these possibly crappy transistors could contribute to the short lifetime.

  • 1
    \$\begingroup\$ The "I266" in the top marking is actually a "1266". \$\endgroup\$ Commented Sep 19, 2017 at 15:35
  • \$\begingroup\$ Although I found this tiny company VIC Semi , they only advertise passive parts like TVS. So it seems to be an unreliable source of clone packaged chips. Judging by the circuit, it seems to be a 10A Nch FET in a fullwave PWM bridge with boost diode cap voltage for high side with 0.2/4 Ohm current sense R's implying 1.5A for a 75mV shunt. So consider Ids ratings at 10x this current with RdsOn< 50 mOhm. \$\endgroup\$ Commented Sep 19, 2017 at 15:55
  • \$\begingroup\$ @TonyStewart.EEsince'75 It is not a PWM bridge. The device is a 4 ch LED dimmer and there are only 4 transistors, so it can't be a bridge, can it? \$\endgroup\$
    – Ariser
    Commented Sep 20, 2017 at 14:50
  • \$\begingroup\$ You can choose any similar logic level Nch FET rated for low RdsOn \$\endgroup\$ Commented Sep 20, 2017 at 15:29
  • \$\begingroup\$ @TonyStewart.EEsince'75 Ok, I see I forgot to explain, why I wanted to know the model and manufacturer. I added some notes to my question. \$\endgroup\$
    – Ariser
    Commented Sep 20, 2017 at 18:08

1 Answer 1


Bit of an educated guess, but it's likely a clone of the AOB266L which is an N channel Trench MOSFET in TO-263 package like the ones in your picture.

Full datasheet: http://www.aosmd.com/pdfs/datasheet/AOB266L.pdf

There is also a company called VIC Semiconductor: http://vicsemi.com/ but their website shows no mention of them making this device.

  • \$\begingroup\$ Either that or it's a clone of the 2SD1266 in a different package. The circuit would also match that. \$\endgroup\$
    – Janka
    Commented Sep 20, 2017 at 18:38

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.