BUY 2SA1521 https://www.utsource.net/itm/p/11273381.html
2SA1521 PNP transistors(BJT) -50V -500mA/-0.5A 250MHz 50 -100mV/-0.1V SOT-23/CP marking OL switch/bias resistor
2SA1521 is a PNP transistor manufactured by Sanyo. It is a surface-mount transistor with a SOT-23/CP package. Description: The 2SA1521 is a PNP transistor designed for general-purpose switching and amplifier applications. Features: Low collector-emitter saturation voltage High current gain High breakdown voltage High switching speed Applications: Audio amplifiers Motor control Power switching circuits Relay drivers High-speed switching circuits (For reference only)