This part is a kind of semiconductor called 2SA757.

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 2SA757 DESCRIPTION ·With TO-3 package ·Complement to type 2SC897 APPLICATIONS ·For audio amplifier power output applications PINNING(see Fig.2) PIN 1 2 3 Base Emitter Fig.1 simplified outline (TO-3) and symbol Collector DESCRIPTION Absolute maximum ratings(Ta=℃) SYMBOL VCBO VCEO VEBO IC ICM PC Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Collector current-peak Collector power dissipation Junction temperature Storage temperature TC=25℃ Open emitter Open base Open collector CONDITIONS VALUE -120 -100 -6 -7 -12 60 150 -55~150 UNIT V V V A A W ℃ ℃ Inchange Semiconductor Product Specification Silicon PNP Power Transistors [ ... ]

2SA757 PDF Datasheet Download