2SC503-GR 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): 100 to 300
• 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-GR transistor can have a current gain of 100 to 300. The gain of the 2SC503 will be in the range from 30 to 300, for the 2SC503-O it will be in the range from 50 to 150, 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-GR might only be marked "C503-GR".The complementary PNP transistor to the 2SC503-GR is the 2SA503-GR.The 2SC3438 (SOT-89) is the SMD version of the 2SC503-GR transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SC503-GR with the 2N3019 or 2N4033.