This part is a kind of semiconductor called 2SA1943.

Function of this product has PNP SILICON TRANSISTOR.

Manufacturers : UTC

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD 2SA1943 PNP SILICON TRANSISTOR POWER AMPLIFIER APPLICATIONS  FEATURES * Complementary to UTC 2SC5200 * Recommended for 100W High Fidelity Audio Frequency Amplifier Output Stage 1 TO-3PL  ORDERING INFORMATION Ordering Number Lead Free Halogen Free Package 2SA1943L-x-T3L-T 2SA1943G-x-T3L-T TO-3PL Note: Pin Assignment: B: Base C: Collector E: Emitter Pin Assignment 123 BCE Packing Tube 2SA1943L-x-T3L-T (1)Packing Type (2)Package Type (3)Rank (4)Green Package (1) T: Tube (2) T3L: TO-3PL (3) x: refer to Classification of hFE (4) L: Lead Free, G: Halogen Free and Lead Free  MARKING www.unisonic.com.tw Copyright © 2014 Unisonic Technologies Co., Ltd 1 of 4 QW-R214-006.D 2SA1943 PNP SILICON TRANSISTOR  ABSOLUTE MAXIMUM RATING (TC [ ... ]

2SA1943 PDF Datasheet Download