This part is a kind of semiconductor called BCP53.

Function of this product has PNP SILICON PLANAR MEDIUM POWER TRANSISTOR.

Manufacturers : Zetex Semiconductors

Image and pinout :

Some of the text within the PDF file :

SOT223 PNP SILICON PLANAR MEDIUM POWER TRANSISTOR ISSUE 3 – AUGUST 1995 7 FEATURES * Suitable for AF drivers and output stages * High collector current and Low VCE(sat) COMPLEMENTARY TYPE – PARTMARKING DETAILS – BCP56 BCP53 BCP53 – 10 BCP53 – 16 C BCP53 E C B ABSOLUTE MAXIMUM RATINGS. PARAMETER Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Peak Pulse Current Continuous Collector Current Power Dissipation at Tamb =25°C Operating and Storage Temperature Range PARAMETER Collector-Base Breakdown Voltage Collector-Emitter Breakdown Voltage Emitter-Base Breakdown Voltage Collector Cut-Off Current Collector-Emitter Saturation Voltage Base-Emitter Turn-On Voltage SYMBOL V(BR)CBO V(BR)CEO V(BR)EBO ICBO MIN. -100 -80 -5 -100 -20 -10 -0.5 -1.0 40 25 63 100 250 100 160 [ ... ]

BCP53 PDF Datasheet Download