This part is a kind of semiconductor called 2N4403.
Function of this product has PNP General Purpose Amplifier.
Manufacturers : Micro Commercial Components
Image and pinout :
Some of the text within the PDF file :
MCC Features • • omponents 21201 Itasca Street Chatsworth !"# $ % !"# 2N4403 Through Hole Package Capable of 600mWatts of Power Dissipation Pin Configuration Bottom View PNP General Purpose Amplifier TO-92 A E C B E Electrical Characteristics @ 25°C Unless Otherwise Specified Symbol Parameter Collector-Emitter Breakdown Voltage* (I C=1.0mAdc, IB=0) Collector-Base Breakdown Voltage (I C=10µ Adc, IE=0) Emitter-Base Breakdown Voltage (I E=10µ Adc, IC=0) Base Cutoff Current (VCE=30Vdc, VBE=3.0Vdc) Collector Cutoff Current (VCE=30Vdc, VBE=3.0Vdc) DC Current Gain* (I C=0.1mAdc, VCE=1.0Vdc) (I C=1.0mAdc, VCE=1.0Vdc) (I C=10mAdc, VCE=1.0Vdc) (I C=150mAdc, VCE=2.0Vdc) (I C=500mAdc, VCE=2.0Vdc) Collector-Emitter Saturation [ ... ]