2SA505 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: -1 A
• Collector Dissipation: 1 W
• DC Current Gain (h_fe): 40 to 240
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The 2SA505 transistor can have a current gain of 40 to 240. The gain of the 2SA505-O will be in the range from 70 to 140, for the 2SA505-R it will be in the range from 40 to 80, for the 2SA505-Y it will be in the range from 120 to 240.Sometimes the "2S" prefix is not marked on the package - the 2SA505 might only be marked "A505".The complementary NPN transistor to the 2SA505 is the 2SC496.The BCP52 (SOT-223) is the SMD version of the 2SA505 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA505 with the BD138, BD138G, BD140, BD140G, BD168, BD170, BD178, BD180, BD180G, BD190, BD229, BD231, BD236, BD236G, BD238, BD238G, BD378, BD380, BD788, BD788G, BD790, BD792, MJE235, MJE252, MJE254, MJE711 or MJE712.