2SA1761 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -50 V
• Collector-Base Voltage, max: -60 V
• Emitter-Base Voltage, max: -6 V
• Collector Current − Continuous, max: -3 A
• Collector Dissipation: 0.9 W
• DC Current Gain (h_fe): 125 to 400
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92MOD

Here is an image showing the pin diagram of this transistor.Sometimes the "2S" prefix is not marked on the package - the 2SA1761 might only be marked "A1761".The complementary NPN transistor to the 2SA1761 is the 2SC4604.The 2SB1123 (SOT-89), 2SB1124 (SOT-89) and BDP950 (SOT-223) is the SMD version of the 2SA1761 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA1761 with the 2SB985.