2SA503-R 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 90
• 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-R transistor can have a current gain of 30 to 90. The gain of the 2SA503 will be in the range from 30 to 300, for the 2SA503-GR it will be in the range from 100 to 300, for the 2SA503-O it will be in the range from 50 to 150.Sometimes the "2S" prefix is not marked on the package - the 2SA503-R might only be marked "A503-R".The complementary NPN transistor to the 2SA503-R is the 2SC503-R.You can replace the 2SA503-R with the 2N4235, 2N4236, 2N4406, 2N5151, 2N5322, 2N5333, 2N6190, 2N6192, 2SA510, 2SA510-R, 2SA512 or 2SA512-R.