2SD1138 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): 60 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 2SD1138 transistor can have a current gain of 60 to 320. The gain of the 2SD1138B will be in the range from 60 to 120, for the 2SD1138C it will be in the range from 100 to 200, for the 2SD1138D it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SD1138 might only be marked "D1138".The complementary PNP transistor to the 2SD1138 is the 2SB861.You can replace the 2SD1138 with the 2SC4381, 2SC4382, 2SD401, 2SD402, 2SD772, 2SD772A, 2SD772B, 2SD792, 2SD792A, 2SD792B, MJE15030, MJE15030G, MJE15032, MJE15032G, MJF15030, MJF15030G, TIP41F or TIP42F.