This part is a kind of semiconductor called A1943.

Function of this product has TO-3P Plastic-Encapsulate Transistors.

Manufacturers : JCST

Image and pinout :

Some of the text within the PDF file :

JIANGSU CHANGJIANG ELECTRONICS TECHNOLOGY CO., LTD TO-3P Plastic-Encapsulate Transistors 2SA1943 TRANSISTOR (PNP) FEATURES z High Collector Current Capability z High Power Dissipation z High Frequency z High Voltage z Complement to 2SA5200 TO – 3P 1. BASE 2. COLLECTOR 3. EMITTER APPLICATIONS z High-Fidelity Audio Output Amplifier z General Purpose Power Amplifier MAXIMUM RATINGS (Ta=25℃ unless otherwise noted) Symbol VCBO VCEO VEBO IC PC PCM RθJA Tj Tstg Parameter Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current Collector Power Dissipation Collector Power Dissipation (TC=25℃) Thermal Resistance From Junction To Ambient Junction Temperature Storage Temperature Value -230 -230 -5 -15 3.5 150 36 150 -55~+150 Unit V V V A W W ℃/W ℃ ℃ [ ... ]

A1943 PDF Datasheet Download