This part is a kind of semiconductor called 3DD1555P.

Function of this product has CASE-RATED BIPOLAR TRANSISTOR.

Manufacturers : JILIN SINO

Image and pinout :

Some of the text within the PDF file :

低频放大管壳额定的双极型晶体管 CASE-RATED BIPOLAR TRANSISTOR FOR TYPE 3DD1555P FOR LOW FREQUENCY R 3DD1555P 主要参数 MAIN CHARACTERISTICS 封装 Package TO-3P(H)IS BVCBO IC VCE(sat) tf 1500 V 5A 3 V(max) 1 μs(max) 用途 ● 彩色电视机行输出电 路 APPLICATIONS ● Horizontal deflection output for color TV. 1 23 产品特性 FEATURES ●3DD1555P是NPN 双极 ● 3DD1555P is high breakdown 型高反压大功率晶体管，制 造中采用的主要工艺技 术有：高压平面工艺技 术、三重扩散技术等,采 用塑料全包封结构。环保 voltage of NPN bipolar transistor. The main process of manufacture: high voltage planar process, triple diffused process etc., adoption of （RoHS）产品。 fully plastic packge. RoHS product. 等� [ ... ]

3DD1555P PDF Datasheet Download