This part is a kind of semiconductor called A42.

Function of this product has NPN Transistor.

Manufacturers : TGS

Image and pinout :

Some of the text within the PDF file :

TIGER ELECTRONIC CO.,LTD TO-92 Plastic-Encapsulate Transistors A42 TRANSISTOR (NPN) TO-92 FEATURES High voltage 1. EMITTER MAXIMUM RATINGS (TA=25℃ unless otherwise noted) Symbol Parameter Value Units 2. BASE 3. COLLECTOR VCBO VCEO Collector-Base Voltage Collector-Emitter Voltage 300 V 300 V VEBO IC PC Emitter-Base Voltage Collector Current -Continuous Collector Power Dissipation 5V 500 mA 625 mW TJ Junction Temperature 150 ℃ Tstg Storage Temperature -55-150 ℃ RӨJA Thermal Resistance, junction to Ambient 200 ℃/mW RӨJC Thermal Resistance, unction to Case 83.3 ℃/mW ELECTRICAL CHARACTERISTICS (Tamb=25℃ unless otherwise specified) Parameter Symbol Test conditions MIN TYP Collector-base breakdown voltage Collector-emitter breakdown voltage V(BR)CBO [ ... ]

A42 PDF Datasheet Download