BUY SAC187 https://www.utsource.net/itm/p/1352299.html
LOW CAPACITANCE TRANSIENT VOLTAGE VBR : 5.0 - 50 Volts SUPPRESSOR
Description: SAC187 is a TO220 packaged, three-terminal, surface-mountable, NPN silicon power transistor. Features: Low collector-emitter saturation voltage Low collector-emitter saturation voltage High current gain High switching speed High breakdown voltage High power dissipation Applications: DC/DC converters Motor control Lighting control Switching power supplies High-frequency switching applications (For reference only)