This part is a kind of semiconductor called 2SD401A.

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 2SD401A www.datasheet4u.com DESCRIPTION ·With TO-220C package ·Complement to type 2SB546A ·Collector current IC=2A ·Collector-collector voltage:VCEO=150V(Min) APPLICATIONS ·For use in general purpose power amplifier, vertical output application PINNING PIN 1 2 3 Base Collector;connected to mounting base Emitter DESCRIPTION Absolute maximum ratings (Ta=25 ) SYMBOL VCBO VCEO VEBO IC ICM PD Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Collector current-peak Total power dissipation Junction temperature Storage temperature TC=25 Open emitter Open base Open collector CONDITIONS VALUE 200 150 5 2 3 25 150 -55~150 UNIT V V V A A W THERMAL CHARACTERISTI [ ... ]

2SD401A PDF Datasheet Download