2SC400-O Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 20 V
• Collector-Base Voltage, max: 30 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 0.1 A
• Collector Dissipation: 0.25 W
• DC Current Gain (h_fe): 60 to 120
• Transition Frequency, min: 300 MHz
• Operating and Storage Junction Temperature Range: -65 to +175 °C
• Package: TO-18

Here is an image showing the pin diagram of this transistor.The 2SC400-O transistor can have a current gain of 60 to 120. The gain of the 2SC400 will be in the range from 60 to 350, for the 2SC400-GR it will be in the range from 170 to 350, for the 2SC400-Y it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SC400-O might only be marked "C400-O".The complementary PNP transistor to the 2SC400-O is the 2SA500-O.The MMBTH10 (SOT-23) is the SMD version of the 2SC400-O transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SC400-O with the 2N2221 or 2N3946.