This part is a kind of semiconductor called 2SD1761.

Function of this product has Silicon NPN Power Transistors.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

Inchange Semiconductor Product Specification Silicon NPN Power Transistors 2SD1761 DESCRIPTION ·With TO-220Fa package ·Low collector saturation voltage ·Complement to type 2SB1187 ·Wide safe operating area APPLICATIONS ·For low frequency power amplifier applications PINNING PIN 1 2 3 DESCRIPTION Base Collector Emitter Fig.1 simplified outline (TO-220Fa) and symbol · Absolute maximum ratings(Ta=25℃) SYMBOL VCBO VCEO VEBO IC ICM PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current (DC) Collector current-Peak TC=25℃ PC Collector power dissipation Ta=25℃ Tj Tstg Junction temperature Storage temperature 2 150 -55~150 ℃ ℃ CONDITIONS Open emitter Open base Open collector VALUE 80 60 5 3 6 30 W UNIT V V V A A Free Datasheet http:/ [ ... ]

2SD1761 PDF Datasheet Download