This part is a kind of semiconductor called 2SD1238L.

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 2SD1238L DESCRIPTION ·With TO-3PN package ·Low collector saturation voltage ·Wide area of safe operation ·Complement to type 2SB922L APPLICATIONS ·Suitable for relay drivers, high-speed inverters,converters, and other largecurrent switching applications 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=25 ) SYMBOL VCBO VCEO VEBO IC ICM PC Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current (DC) Collector current-peak Collector power dissipation Junction temperature Storage temperature TC=25 CONDITIONS Open emitter Open base Open c [ ... ]

2SD1238L PDF Datasheet Download