2SC503-O Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 100 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 0.6 A
• Collector Dissipation: 6 W
• DC Current Gain (h_fe): 50 to 150
• Transition Frequency, min: 80 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 2SC503-O transistor can have a current gain of 50 to 150. The gain of the 2SC503 will be in the range from 30 to 300, for the 2SC503-GR it will be in the range from 100 to 300, for the 2SC503-R it will be in the range from 30 to 90.Sometimes the "2S" prefix is not marked on the package - the 2SC503-O might only be marked "C503-O".The complementary PNP transistor to the 2SC503-O is the 2SA503-O.You can replace the 2SC503-O with the 2N4239, 2N5320, 2N5335, 2N5681, 2N5682, 2SC510 or 2SC510-O.