This part is a kind of semiconductor called 2SA1859A.
Function of this product has Power Transistor.
Manufacturers : Inchange Semiconductor
Image and pinout :
Some of the text within the PDF file :
Inchange Semiconductor Product Specification Silicon PNP Power Transistors 2SA1859 2SA1859A DESCRIPTION ·With TO-220F package ·Complement to type 2SC4883/4883A APPLICATIONS ·For audio output driver and TV velocity-modulation applications PINNING PIN 1 2 3 Base Collector Emitter Fig.1 simplified outline (TO-220F) and symbol DESCRIPTION Absolute maximum ratings (Ta=25℃) SYMBOL PARAMETER 2SA1859 VCBO Collector-base voltage 2SA1859A 2SA1859 VCEO Collector-emitter voltage 2SA1859A VEBO IC IB B CONDITIONS VALUE -150 UNIT Open emitter -180 -150 Open base -180 Open collector -6 -2 -1 TC=25℃ 20 150 -55~150 V V Emitter-base voltage Collector current Base current Collector dissipation Junction temperature Storage temperature V A A W ℃ ℃ PC Tj Tstg Inchan [ ... ]