2SA594 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -45 V
• Collector-Base Voltage, max: -60 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.2 A
• Collector Dissipation: 5 W
• DC Current Gain (h_fe): 40 to 240
• Transition Frequency, min: 200 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 2SA594 transistor can have a current gain of 40 to 240. The gain of the 2SA594-O will be in the range from 70 to 140, for the 2SA594-R it will be in the range from 40 to 80, for the 2SA594-Y it will be in the range from 120 to 240.Sometimes the "2S" prefix is not marked on the package - the 2SA594 might only be marked "A594".The complementary NPN transistor to the 2SA594 is the 2SC594.The 2SA1483 (SOT-89) and FJX733 (SOT-323) is the SMD version of the 2SA594 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA594 with the 2N5323, 2SA503, BC161, BC303, BC304 or BC461.