This part is a kind of semiconductor called 2SA1142.

Function of this product has POWER TRANSISTOR.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

www.net Inchange Semiconductor Product Specification Silicon PNP Power Transistors 2SA1142 DESCRIPTION ·With TO-126 package ·Complement to type 2SC2682 APPLICATIONS ·Audio frequency power amplifier; high frequency power amplifier applications PINNING PIN 1 2 3 DESCRIPTION Emitter Collector;connected to mounting base Base Fig.1 simplified outline (TO-126) and symbol Absolute maximum ratings(Ta=25℃) SYMBOL VCBO VCEO VEBO IC PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Ta=25℃ PC Collector power dissipation TC=25℃ Tj Tstg Junction temperature Storage temperature 8 150 -55~150 ℃ ℃ CONDITIONS Open emitter Open base Open collector VALUE -180 -180 -5 -0.1 1.2 W UNIT V V V A Inchange Semiconductor Product Specific [ ... ]

2SA1142 PDF Datasheet Download