2SC3478A Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 200 V
• Collector-Base Voltage, max: 200 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 0.1 A
• Collector Dissipation: 0.75 W
• DC Current Gain (h_fe): 135 to 400
• Transition Frequency, min: 120 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The 2SC3478A is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, collector, and base leads.
Here is an image showing the pin diagram of this transistor.The 2SC3478A transistor can have a current gain of 135 to 400. The gain of the 2SC3478A-K will be in the range from 200 to 400, for the 2SC3478A-L it will be in the range from 135 to 270.Sometimes the "2S" prefix is not marked on the package - the 2SC3478A might only be marked "C3478A".The complementary PNP transistor to the 2SC3478A is the 2SA1376A.The BF622 (SOT-89) and BF822 (SOT-23) is the SMD version of the 2SC3478A transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.