This part is a kind of semiconductor called D1855.

Function of this product has 2SD1855.

Manufacturers : SavantIC

Image and pinout :

Some of the text within the PDF file :

SavantIC Semiconductor Silicon NPN Power Transistors Product Specification 2SD1855 DESCRIPTION www.dat·aWshiethet4TuO.co-2m20Fa package ·Complement to type 2SB1335 ·Low collector saturation voltage 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 PARAMETER VCBO VCEO VEBO IC PC Tj Tstg Collector-base voltage Collector -emitter voltage Emitter-base voltage Collector current Collector power dissipation Junction temperature Storage temperature CONDITIONS Open emitter Open base Open collector TC=25 VALUE 80 60 6 4 30 150 -55~150 UNIT V V V A W SavantIC Semiconductor Silicon NPN Power Transistors Product Specification 2SD1855 [ ... ]

D1855 PDF Datasheet Download