2SA503-GR 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): 100 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-GR transistor can have a current gain of 100 to 300. The gain of the 2SA503 will be in the range from 30 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-GR might only be marked "A503-GR".The complementary NPN transistor to the 2SA503-GR is the 2SC503-GR.The 2SB710A (SOT-23), DXT2907A (SOT-89), DZT2907A (SOT-223), FJX2907A (SOT-323), FMMT2907A (SOT-23), FMMT2907AR (SOT-23), FMMTA55 (SOT-23), KN2907AS (SOT-23), KST2907A (SOT-23), KST55 (SOT-23), KTN2907AS (SOT-23), KTN2907AU (SOT-323), MMBTA55 (SOT-23), MMST2907A (SOT-323), PMBT2907A (SOT-23), PMST2907A (SOT-23), PZTA55 (SOT-223) and SMBTA55 (SOT-23) is the SMD version of the 2SA503-GR transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA503-GR with the 2N2905A or 2N4405.