This part is a kind of semiconductor called 2SD2012.

Function of this product has SILICON POWER TRANSISTOR.

Manufacturers : SavantIC

Image and pinout :

Some of the text within the PDF file :

SavantIC Semiconductor Product Specification Silicon NPN Power Transistors 2SD2012 DESCRIPTION ·With TO-220F package ·Complement to type 2SB1366 ·Low collector saturation voltage ·Collector power dissipation: PC=25W(TC=25 ) APPLICATIONS ·Audio frequency power amplifier and general purpose switching applications PINNING PIN 1 2 3 Base Collector Emitter Fig.1 simplified outline (TO-220F) and symbol DESCRIPTION Absolute maximum ratings (Ta=25 ) SYMBOL VCBO VCEO VEBO IC IB PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Base current Ta=25 PC Collector dissipation TC=25 Tj Tstg Junction temperature Storage temperature 25 150 -55~150 CONDITIONS Open emitter Open base Open collector VALUE 60 60 7 3 0.5 2.0 W UNIT V [ ... ]

2SD2012 PDF Datasheet Download