This part is a kind of semiconductor called 3DD4126PL.
Function of this product has MIDDLING VOLTAGE FAST-SWITCHING NPN POWER TRANSISTOR.
Manufacturers : JILIN SINO
Image and pinout :
Some of the text within the PDF file :
R NPN 型中压功率开关晶体管 MIDDLING VOLTAGE FAST-SWITCHING NPN POWER TRANSISTOR 3DD4126PL 主要参数 IC VCEO PC(TO-126) PC(TO-220) MAIN CHARACTERISTICS 3A 200V 40W 60W 封装 Package 用途 z z z z 节能灯 电子镇流器 电子变压器 一般功率放大电路 APPLICATIONS z Energy-saving ligh z Electronic ballasts z Electronic transformer z Commonly power amplifier circuit 产品特性 z 中耐压 z 高电流容量 z 高开关速度 z 高可靠性 z 环保（RoHS）产品 FEATURES z Middling breakdown voltage z High current capability z High switching speed z High reliability z RoHS product www.DataSheet.co.kr 订货信息 ORDER MESSAGE 订 货 型 号 Order codes 3DD4126PL-O-M-N-C 3DD4126PL-O-Z-N-C 印 记 否 否 无卤素 Halogen Free NO NO 封 装 包 �� [ ... ]