This part is a kind of semiconductor called 2SD998.

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 2SD998 DESCRIPTION ·With TO-3PML package ·Complement to type 2SB778 APPLICATIONS ·High power amplifier applications ·Recommended for 45~50W audio frequency amplifier output stage PINNING PIN 1 2 3 Base Collector Emitter Fig.1 simplified outline (TO-3PML) and symbol DESCRIPTION Absolute maximum ratings (Ta=25 ) SYMBOL VCBO VCEO VEBO IC IB PC Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Base current Collector dissipation Junction temperature Storage temperature TC=25 CONDITIONS Open emitter Open base Open collector MAX 120 120 5 10 1.0 80 150 -55~150 UNIT V V V A A W SavantIC Semiconductor Product Specification Silicon NPN Po [ ... ]

2SD998 PDF Datasheet Download