This part is a kind of semiconductor called C3012.

Function of this product has 2SC3012.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

SavantIC Semiconductor Product Specification Silicon NPN Power Transistors 2SC3012 DESCRIPTION ·With TO-3PN package ·Complement to type 2SA1232 ·High transition frequency APPLICATIONS ·Audio frequency power amplifier. PINNING 1 2 3 Base PIN DESCRIPTION Collector;connected to mounting base Emitter Fig.1 simplified outline (TO-3PN) and symbol 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 130 130 5 10 15 100 150 -55~150 UNIT V V V A A W SavantIC Semiconductor Product Specification Silic [ ... ]

C3012 PDF Datasheet Download