2SC109A Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 50 V
• Collector-Base Voltage, max: 70 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 0.8 A
• Collector Dissipation: 0.8 W
• DC Current Gain (h_fe): 40 to 240
• Transition Frequency, min: 150 MHz
• Operating and Storage Junction Temperature Range: -65 to +175 °C
• Package: TO-39

Here is an image showing the pin diagram of this transistor.The 2SC109A transistor can have a current gain of 40 to 240. The gain of the 2SC109A-O will be in the range from 70 to 140, for the 2SC109A-R it will be in the range from 40 to 80, for the 2SC109A-Y it will be in the range from 120 to 240.Sometimes the "2S" prefix is not marked on the package - the 2SC109A might only be marked "C109A".You can replace the 2SC109A with the 2N5321, 2SC108A, BC141 or BC441.