2SA1931 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -50 V
• Collector-Base Voltage, max: -60 V
• Emitter-Base Voltage, max: -7 V
• Collector Current − Continuous, max: -5 A
• Collector Dissipation: 25 W
• DC Current Gain (h_fe): 100 to 300
• Transition Frequency, min: 60 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220F

Here is an image showing the pin diagram of this transistor.Sometimes the "2S" prefix is not marked on the package - the 2SA1931 might only be marked "A1931".The complementary NPN transistor to the 2SA1931 is the 2SC4881.The 2SB1124 (SOT-89) and BDP950 (SOT-223) is the SMD version of the 2SA1931 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA1931 with the 2SA1742, 2SA1743, 2SA1744, 2SA770, 2SA771, 2SB633, BD204, BD244A, BD244B, BD244C, BD304, BD536, BD538, BD540A, BD540B, BD540C, BD544A, BD544B, BD544C, BD546A, BD546B, BD546C, BD798, BD800, BD802, BD808, BD810, BD950, BD952, BD954, BDT82, BDT82F, BDT84, BDT84F, BDT86, BDT86F, BDX78, D45H11, D45H11FP or D45H8.