2SC400-Y 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): 100 to 200
• 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-Y transistor can have a current gain of 100 to 200. 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-O it will be in the range from 60 to 120.Sometimes the "2S" prefix is not marked on the package - the 2SC400-Y might only be marked "C400-Y".The complementary PNP transistor to the 2SC400-Y is the 2SA500-Y.The MMBTH10 (SOT-23) is the SMD version of the 2SC400-Y transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SC400-Y with the 2N2221A, 2N2222, 2N2222A, 2N3947, BC378 or NTE123A.