2SA503 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -50 V
• Collector-Base Voltage, max: -60 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.6 A
• Collector Dissipation: 6 W
• DC Current Gain (h_fe): 30 to 300
• Transition Frequency, min: 130 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 2SA503 transistor can have a current gain of 30 to 300. The gain of the 2SA503-GR will be in the range from 100 to 300, for the 2SA503-O it will be in the range from 50 to 150, for the 2SA503-R it will be in the range from 30 to 90.Sometimes the "2S" prefix is not marked on the package - the 2SA503 might only be marked "A503".The complementary NPN transistor to the 2SA503 is the 2SC503.