2SC1618 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 60 V
• Collector-Base Voltage, max: 80 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 6 A
• Collector Dissipation: 50 W
• DC Current Gain (h_fe): 20 to 180
• Transition Frequency, min: 10 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3

Here is an image showing the pin diagram of this transistor.Sometimes the "2S" prefix is not marked on the package - the 2SC1618 might only be marked "C1618".You can replace the 2SC1618 with the 2SC1619, KD502 or KD503.