This part is a kind of semiconductor called C5931.

Function of this product has 2SC5931.

Manufacturers : Panasonic Semiconductor

Image and pinout :

Some of the text within the PDF file :

Power Transistors 2SC5931 Silicon NPN triple diffusion mesa type Horizontal deflection output for TV, CRT monitor 15.5±0.5 (10.0) Unit: mm φ 3.2±0.1 5˚ (4.5) 3.0±0.3 5˚ I Features • High breakdown voltage: VCBO ≥ 1 700 V • High speed switching: tf < 200 ns • Wide safe operation area 26.5±0.5 (23.4) (2.0) 5˚ (4.0) 2.0±0.2 1.1±0.1 0.7±0.1 5.45±0.3 10.9±0.5 5.5±0.3 5˚ 5˚ I Absolute Maximum Ratings TC = 25°C Parameter Collector-base voltage (Emitter open) Collector-emitter voltage (E-B short) Collector-emitter voltage (Base open) Emitter-base voltage (Collector open) Base current Collector current Peak collector current * Collector power dissipation Ta = 25°C Junction temperature Storage temperature Tj Tstg Symbol VCBO VCES VCEO VEBO IB IC [ ... ]

C5931 PDF Datasheet Download