This part is a kind of semiconductor called TTA1943.

Function of this product has Silicon PNP triple diffusion planar transistor.

Manufacturers : nELL

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Some of the text within the PDF file :

SEMICONDUCTOR TTA1943 Silicon PNP triple diffusion planar transistor -15A/-230V/150W RoHS RoHS Nell High Power Products 20.00±0.20 18.00 ø3.30 ± 0.20 5.00 3.00 2.00 9.00 4.00 6.00 20.50 26.00 TO-3PL 3.00 2.50 (typ.) FEATURES High-speed switching High collector-emitter voltage: VCEO = -230V(min) Complementary to TTC5200 TO-3PL package which can be installed to the heat sink with one screw 1.00 (typ.) 2.50 0.60 5.45 ± 0.05 3.20 5.45 ± 0.05 1 2 3 C (2) 1. BASE 2. COLLECTOR (HEAT SINK) APPLICATIONS Power amplifier Recommended for 100W high-fidelity audio frequency amplifier output stage 3. EMITTER B (1) PNP E (3) All dimensions in millimeters ABSOLUTE MAXIMUM RATINGS (Ta = 25°C) SYMBOL VCBO V CEO V EBO IC I CP IB PC Tj T stg PARAMETER Collector to base voltage Col [ ... ]

TTA1943 PDF Datasheet Download