This part is a kind of semiconductor called 2SC2591.

Function of this product has (2SC2591 / 2SC2592) SILICON POWER TRANSISTOR.

Manufacturers : SavantIC

Image and pinout :

Some of the text within the PDF file :

SavantIC Semiconductor Product Specification Silicon NPN Power Transistors 2SC2591 2SC2592 DESCRIPTION ·With TO-220 package ·Complement to type 2SA1111/1112 ·Good linearity of hFE ·High VCEO APPLICATIONS ·For audio frequency, high power amplifiers application PINNING PIN 1 2 3 Base Collector;connected to mounting base Emitter Fig.1 simplified outline (TO-220) and symbol DESCRIPTION ABSOLUTE MAXIMUM RATINGS(TC=25 ) SYMBOL PARAMETER 2SC2591 VCBO Collector-base voltage 2SC2592 2SC2591 VCEO Collector-emitter voltage 2SC2592 VEBO IC ICM PC Tj Tstg Emitter-base voltage Collector current Collector current-peak Collector power dissipation Junction temperature Storage temperature TC=25 Open collector Open base 180 5 1 1.5 20 150 -55~150 V A A W Open emitter 180 150 V C [ ... ]

2SC2591 PDF Datasheet Download