BUY KST42MTF https://www.utsource.net/itm/p/11275330.html
KST42MTF NPN Transistors(BJT) 300V 500mA/0.5A 500MHz 40 500mV/0.5V SOT-23/SC-59 marking 1D high voltage
Fairchild Package: SOT-23/SC-59 Description: N-Channel Enhancement Mode MOSFET Features: rn Low On-Resistance rn Low Input Capacitance rn Low Input/Output Leakage rn Fast Switching rn ESD Protection Applications: rn DC-DC Converters rn Battery Management rn Load Switching rn Motor Control rn General Purpose Switching (For reference only)