This part is a kind of semiconductor called D2638.

Function of this product has 2SD2638.

Manufacturers : Toshiba Semiconductor

Image and pinout :

Some of the text within the PDF file :

TOSHIBA Transistor Silicon NPN Triple Diffused Mesa Type 2SD2638 Horizontal Deflection Output for Color TV, Digital TV. High Speed Switching Applications. 2SD2638 Unit: mm · High voltage: VCBO = 1700 V · Low saturation voltage: VCE (sat) = 5 V (max) · High speed: tf = 0.8 µs (max) Maximum Ratings (Tc = 25°C) Characteristics Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current DC Pulse Base current Collector power dissipation Junction temperature Storage temperature range Symbol VCBO VCEO VEBO IC ICP IB PC Tj Tstg Rating 1700 750 5 7 14 3.5 50 150 -55~150 Equivalent Circuit 2. Collector Unit V V V A A W °C °C JEDEC ― JEITA ― TOSHIBA 2-16E3A Weight: 5.5 g (typ.) 1. Base 50 W (typ.) 3. Emitter Electrical Characteristics [ ... ]

D2638 PDF Datasheet Download