This part is a kind of semiconductor called C3181.

Function of this product has 2SC3181.

Manufacturers : SavantIC

Image and pinout :

Some of the text within the PDF file :

SavantIC Semiconductor Silicon NPN Power Transistors DESCRIPTION ·With TO-3P(I) package ·Complement to type 2SA1264 APPLICATIONS ·Power amplifier applications ·Recommend for 55W high fidelity audio frequency amplifier output stage PINNING PIN 1 2 3 DESCRIPTION Base Collector;connected to mounting base Emitter Product Specification 2SC3181 Fig.1 simplified outline (TO-3P(I)) and symbol Absolute maximum ratings(Ta=25 ) SYMBOL PARAMETER VCBO VCEO Collector-base voltage Collector-emitter voltage VEBO IC IB PT Tj Emitter-base voltage Collector current Base current Total power dissipation Junction temperature Tstg Storage temperature CONDITIONS Open emitter Open base Open collector TC=25 VALUE 120 120 5 8 0.8 80 150 -55~150 UNIT V V V A A W SavantIC Semic [ ... ]

C3181 PDF Datasheet Download