KSD401 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 150 V
• Collector-Base Voltage, max: 200 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 2 A
• Collector Dissipation: 25 W
• DC Current Gain (h_fe): 120 to 400
• Transition Frequency, min: 5 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220
• Electrically Similar to the Popular 2SD401 transistor

Here is an image showing the pin diagram of this transistor.The KSD401 transistor can have a current gain of 120 to 400. The gain of the KSD401-G will be in the range from 200 to 400, for the KSD401-Y it will be in the range from 120 to 240.The complementary PNP transistor to the KSD401 is the KSB546.You can replace the KSD401 with the 2SC4381, 2SC4382, 2SD401, 2SD402, 2SD772, 2SD772A, 2SD772B, 2SD792, 2SD792A, 2SD792B, MJE15030, MJE15030G, MJE15032, MJE15032G, MJF15030, MJF15030G, TIP41F or TIP42F.