2SD400E 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): 100 to 200
• 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 2SD400E transistor can have a current gain of 100 to 200. 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 2SD400F it will be in the range from 160 to 320, for the 2SD400G it will be in the range from 280 to 560.Sometimes the "2S" prefix is not marked on the package - the 2SD400E might only be marked "D400E".The complementary PNP transistor to the 2SD400E is the 2SB544E.The 2SC3265 (SOT-23), 2SC3265-O (SOT-23), 2SD874 (SOT-89), BC818 (SOT-23), BC818-16 (SOT-23), BC818-16W (SOT-323), BC818W (SOT-323), BCX20 (SOT-23), KSC3265 (SOT-23) and KSC3265-O (SOT-23) is the SMD version of the 2SD400E transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SD400E with the 2SC1061, 2SC1061-C, 2SC1173, 2SC1398, 2SC1418, 2SC1418-C, 2SC1419, 2SC1419-C, 2SC2562, 2SC3239, 2SC3297, 2SC3299, 2SC3345, 2SC3709, 2SC3709A, 2SC4881, 2SC4935, 2SC790, 2SD1060, 2SD1060-R, 2SD1061, 2SD1061-R, 2SD1062, 2SD1062-R, 2SD1133, 2SD1133-C, 2SD1212, 2SD1212-R, 2SD1235, 2SD1235-R, 2SD1363, 2SD1412, 2SD1444A, 2SD1445A, 2SD1667, 2SD1667-R, 2SD1668, 2SD1668-R, 2SD1669, 2SD1669-R, 2SD1762, 2SD1762E, 2SD2061E, 2SD234, 2SD235, 2SD2395, 2SD2395-E, 2SD325, 2SD325-E, 2SD330, 2SD330E, 2SD476, 2SD476-C, 2SD553, 2SD612, 2SD612-E, 2SD612K, 2SD612K-E, 2SD795, 2SD795-Q, BD201, BD239, BD241, BD243, BD301, BD533, BD539, BD543, BD545, BD733, BD735, BD737, BD795, BD933, BD933F, BD945, BD947, BDT29, KSC1173, KTC3230 or KTC4369.