ON Semiconductor, BCP53T1G, Transistors, Bipolar (BJT) Transistors

 BCP Series 80 V 1.5 A Surface Mount PNP Silicon Epitaxial Transistor - SOT-223

https://www.futureelectronics.com/p/semiconductors--discretes--transistors--bipolar-transistors/bcp53t1g-on-semiconductor-6569693