2SD1138D Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 150 V
• Collector-Base Voltage, max: 200 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 2 A
• Collector Dissipation: 30 W
• DC Current Gain (h_fe): 160 to 320
• Operating and Storage Junction Temperature Range: -45 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The 2SD1138D transistor can have a current gain of 160 to 320. The gain of the 2SD1138 will be in the range from 60 to 320, for the 2SD1138B it will be in the range from 60 to 120, for the 2SD1138C it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SD1138D might only be marked "D1138D".You can replace the 2SD1138D with the 2SC4381, 2SC4382, 2SC5171, 2SD401, 2SD402, 2SD772, 2SD772A, 2SD772B, 2SD792, 2SD792A, 2SD792B, KSD401, MJE15030, MJE15030G, MJE15032, MJE15032G, MJF15030, MJF15030G, TIP150, TIP41F or TIP42F.