I have a small SOT-23 (3 pins, transistor-like) device that burned out (shorted between 2 pins). I need to identify it so i can replace it.

It belongs to an Asus mainboard and after it burned down the SSD1 interface (on the left) 1 stopped working (no damage to the HDD).

The marking on it seems to be 018 ⊃

Any help would be apreciated.

The burned component

the area around it

desoldered and pin tensions

  • \$\begingroup\$ Can you remove that component and then use your multi-meter to tell us what voltage each pin has? (aka where is each pin connected. To 5V? GND?) \$\endgroup\$ Mar 15, 2021 at 0:22
  • \$\begingroup\$ @ChristianidisVasileios How would you be able to tell that? Pins don't have voltage when removed from a circuit, you can tell resistance and which may be connected together, but I'm not sure how you can identify which is GND and Supply...? \$\endgroup\$
    – Ron Beyer
    Mar 15, 2021 at 2:13
  • \$\begingroup\$ I meant the pins on the PCB, not on the component. Remove the component, and measure the voltage on the PCB. \$\endgroup\$ Mar 15, 2021 at 9:58
  • \$\begingroup\$ @ChristianidisVasileios I cannot desolder it right now I've been looking at some similar mainboard schematics and it could be a N-MOSFET 2N7002K I't a common SOT-23 around that area \$\endgroup\$
    – Angus
    Mar 18, 2021 at 14:37
  • \$\begingroup\$ It probably is either a mosfet or a BJT transistor, its base being the right pin, and the top and bottom left the source and drain \$\endgroup\$ Mar 18, 2021 at 14:40

1 Answer 1


The marking is "01B" in fact if you zoom more and the marking format is typical from Onsemi (dot below and sideways character for traceability).

Then this is probably a LP2301BLT1G / T3G from Leshan Radio Company (Onsemi and LRC are associated in China (source) ).

LP2301BLT1G datasheet

enter image description here

Picture from LCSC: enter image description here


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