This part is a kind of semiconductor called 2SD2439.

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 Darlington Power Transistors 2SD2439 DESCRIPTION ·With TO-3PML package ·Complement to type 2SB1588 APPLICATIONS ·Audio ,series regulator and general purpose applications PINNING PIN 1 2 3 Base Collector Fig.1 simplified outline (TO-3PML) and symbol Emitter DESCRIPTION Absolute maximum ratings(Tc=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 power dissipation Junction temperature Storage temperature TC=25 CONDITIONS Open emitter Open base Open collector VALUE 160 150 5 10 1 80 150 -55~150 UNIT V V V A A W 1 SavantIC Semiconductor Product Specification Silicon NPN Darlington Power Trans [ ... ]

2SD2439 PDF Datasheet Download