This part is a kind of semiconductor called MPSA42.

Function of this product has NPN EPITAXIAL PLANAR SILICON TRANSISTORS.

Manufacturers : CDIL

Image and pinout :

Some of the text within the PDF file :

Continental Device India Limited An ISO/TS 16949, ISO 9001 and ISO 14001 Certified Company NPN EPITAXIAL PLANAR SILICON TRANSISTORS MPSA 42 MPSA 43 TO-92 CBE EBC High Voltage Transistors. ABSOLUTE MAXIMUM RATINGS(Ta=25deg C unless otherwise specified) DESCRIPTION SYMBOL MPSA42 MPSA43 Collector -Emitter Voltage Collector -Base Voltage Emitter -Base Voltage Collector Current Continuous Power Dissipation @ Ta=25 degC Derate above 25 deg C Power Dissipation @ Tc=25 degC Derate above 25 deg C Operating And Storage Junction Temperature Range VCEO VCBO VEBO IC PD PD Tj, Tstg 300 200 300 200 6 500 625 5 1.5 12 -55 to +150 THERMAL RESISTANCE Junction to Case Junction to Ambient Rth(j-c) Rth(j-a) 83.3 200 ELECTRICAL CHARACTERISTICS (Ta=25 deg C Unless Otherwise Specified) DESCRIPTION [ ... ]

MPSA42 PDF Datasheet Download