This part is a kind of semiconductor called 2SC2581.

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 2SC2581 DESCRIPTION ·With TO-3PN package ·Complement to type 2SA1106 ·High power dissipation ·High current capability APPLICATIONS ·Audio power amplifier ·DC-DC converter PINNING PIN 1 2 3 Base Collector;connected to mounting base Emitter Fig.1 simplified outline (TO-3PN) and symbol DESCRIPTION Absolute maximum ratings(Ta= ) SYMBOL VCBO VCEO VEBO IC PC Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Collector power dissipation Junction temperature Storage temperature TC=25 Open emitter Open base Open collector CONDITIONS VALUE 200 140 6 10 100 150 -55~150 UNIT V V V A W SavantIC Semiconductor Product Specif [ ... ]

2SC2581 PDF Datasheet Download