This part is a kind of semiconductor called 2SA1943.

Function of this product has PNP Epitaxial Silicon Transistor.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

2SA1943/FJL4215 PNP Epitaxial Silicon Transistor Applications • High-Fidelity Audio Output Amplifier • General Purpose Power Amplifier Features • High Current Capability: IC = -17A. • High Power Dissipation : 150watts. • High Frequency : 30MHz. • High Voltage : VCEO= -250V • Wide S.O.A for reliable operation. • Excellent Gain Linearity for low THD. • Complement to 2SC5200/FJL4315. • Full thermal and electrical Spice models are available. • Same transistor is also available in: -- TO3P package, 2SA1962/FJA4213 : 130 watts -- TO220 package, FJP1943 : 80 watts -- TO220F package, FJPF1943 : 50 watts Absolute Maximum Ratings* Ta = 25°C unless otherwise noted Symbol Parameter BVCBO BVCEO BVEBO IC IB PD Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Volt [ ... ]

2SA1943 PDF Datasheet Download