This part is a kind of semiconductor called BCP157.

Function of this product has Medium Power Transistor.

Manufacturers : SeCoS

Image and pinout :

Some of the text within the PDF file :

BCP157 Elektronische Bauelemente RoHS Compliant Product PNP Silicon Medium Power Transistor Features www.DataSheet4U.net 1. -60Volt V CEO 2. 3 Amp continuous current SOT-89 1.BASE 2.COLLECTOR 3.EMITTER D 3. Low saturation voltage    D1 A z$EVROXWHPD[LPXPUDWLQJV 7D °& Parameter Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Symbol VCBO VCEO VEBO IC Limits -80 -60 -5 -3 -6 0.5 Total power dissipation PC 2 Junction temperature Storage temperature Tj Tstg 150 −55~+150 W ∗2 E1 b1 Unit V b C V V A(DC) A(Pulse)∗1 W L e e1 Symbol A b b1 c D D1 E E1 Dimensions In Millimeters Min 1.400 0.320 0.360 0.350 4.400 1.400 2.300 3.940 1.500TYP 2.900 0.900 3.100 1.100 Max 1.600 0.520 0.560 0.440 4.600 1.800 2.600 4.250 Min E Dimensions [ ... ]

BCP157 PDF Datasheet Download