2SA594-Y 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): 120 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-Y transistor can have a current gain of 120 to 240. The gain of the 2SA594 will be in the range from 40 to 240, for the 2SA594-O it will be in the range from 70 to 140, for the 2SA594-R it will be in the range from 40 to 80.Sometimes the "2S" prefix is not marked on the package - the 2SA594-Y might only be marked "A594-Y".The complementary NPN transistor to the 2SA594-Y is the 2SC594-Y.The 2SA1037 (SOT-23), 2SA1037-Q (SOT-23), 2SA1483 (SOT-89), 2SA1483-Y (SOT-89), 2SA812 (SOT-23), FJX733 (SOT-323), FJX733Y (SOT-323) and KSA812 (SOT-23) is the SMD version of the 2SA594-Y transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA594-Y with the 2N2905A, 2N3251A, 2N4405, 2N4407, 2N5323, 2N6191, 2SA503, 2SA503-GR, BC161, BC161-16, BC303, BC303-6, BC304, BC304-6, BC461 or BC461-6.