2SD400G Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 25 V
• Collector-Base Voltage, max: 25 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 0.9 W
• DC Current Gain (h_fe): 280 to 560
• Transition Frequency, min: 180 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The 2SD400G transistor can have a current gain of 280 to 560. The gain of the 2SD400 will be in the range from 60 to 560, for the 2SD400D it will be in the range from 60 to 120, for the 2SD400E it will be in the range from 100 to 200, for the 2SD400F it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SD400G might only be marked "D400G".The complementary PNP transistor to the 2SD400G is the 2SB544G.The BC818 (SOT-23), BC818-40 (SOT-23), BC818-40W (SOT-323), BC818W (SOT-323) and BCX20 (SOT-23) is the SMD version of the 2SD400G transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SD400G with the 2SD1158, BD201, BD239, BD241, BD243, BD301, BD533, BD539, BD543, BD545, BD733, BD735, BD737, BD795 or BDT29.