BUY ZTX851 https://www.utsource.net/itm/p/1351619.html
NPN SILICON PLANAR MEDIUM POWER HIGH CURRENT TRANSISTOR
Description: The ZTX851 is a NPN silicon planar epitaxial transistor with a high current gain and low saturation voltage. Features: - High current gain - Low saturation voltage - Low noise - High frequency operation - Low power dissipation Applications: - Audio amplifiers - Switching circuits - Motor control circuits - General purpose switching and amplification (For reference only)