This part is a kind of semiconductor called D2603.

Function of this product has SILICON NPN TRANSISTOR.

Manufacturers : FOSHAN BLUE ROCKET

Image and pinout :

Some of the text within the PDF file :

2SD2603(3DD2603) 硅 NPN 半导体三极管/SILICON NPN TRANSISTOR 用途：用于一般功率输出放大。 Purpose: Power out amplifier applications. 特点：击穿电压高,饱和压降低。 Features: High VCEO,low V .CE(sat) 极限参数/Absolute maximum ratings(Ta=25℃) 参数符号 数值 单位 Symbol Rating Unit VCBO 100 V VCEO 100 V VEBO 5.0 V IC 5.0 A PC 2.0 W PC(TC=25℃) 40 W Tj 150 ℃ Tstg -55～150 ℃ 电性能参数/Electrical characteristics(Ta=25℃) 参数符号 Symbol 测试条件 Test condition ICBO IEBO hFE VCE(sat) fT VCB=100V VEB=5.0V VCE=5.0V IC=3.0A VCE=5.0V IE=0 IC=0 IC=1.0A* IB=0.3A* IC=500mA f=1.0MHz 最小值 Min 60 10 数值 Rating 典型值 Typ 最大值 Max 20 20 200 1.0 单位 Unit μA μA V MHz *:脉冲测试/pulse test. [ ... ]

D2603 PDF Datasheet Download