This part is a kind of semiconductor called 2SD2017.
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 2SD2017 DESCRIPTION ·With TO-220F package ·DARLINGTON APPLICATIONS ·Driver for solenoid,relay and motor and general purpose applications PINNING PIN 1 2 3 Base Collector Emitter Fig.1 simplified outline (TO-220F) 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 VALUE 300 250 20 6 1 35 150 -55~150 UNIT V V V A A W SavantIC Semiconductor Product Specification Silicon NPN Power Transistors CHARACTERISTICS Tj=25 unles [ ... ]