This part is a kind of semiconductor called 2SA1943.

Function of this product has PNP Epitaxial Silicon Transistor.

Manufacturers : JILIN SINO

Image and pinout :

Some of the text within the PDF file :

PNP 硅外延晶体管 PNP Epitaxial Silicon Transistor R 2SA1943 SERIES 用途 应用于功率放大器 产品特性 高集电极电压：VCEO=230V (min) VCEO=250V (min) 与 2SC5200 互补 推荐用于 100W 音响频率放大器输出电路 环保（RoHS）产品 APPLICATIONS  Power Amplifier Applications FEATURES High collector voltage：VCEO=230V (min) VCEO=250V (min) Complementary to 2SC5200 Recommended for 100W audio frequency amplifier output RoHS product 封装 Package TO-3PL(T) TO-3PB 1 基极 BASE 3 发射极 EMITTER 2 集电极（热沉）COLLECTOR (HEAT SINK) 订货信息 ORDER MESSAGE 订货型号 印记 Order codes Marking 2SA1943-O-AL-N-D 2SA1943-O-AL-N-B 2SA1943-O-AB -N-B 2SA1943A-O-AL-N-D 2SA1943A-O-AL-N-B 2SA1943A-O-AB -N-B 2SA1943 [ ... ]

2SA1943 PDF Datasheet Download