2SA594-O 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): 70 to 140
• 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-O transistor can have a current gain of 70 to 140. The gain of the 2SA594 will be in the range from 40 to 240, 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-O might only be marked "A594-O".The complementary NPN transistor to the 2SA594-O is the 2SC594-O.The 2SA1483 (SOT-89), 2SA1483-O (SOT-89), FJX733 (SOT-323) and FJX733O (SOT-323) is the SMD version of the 2SA594-O transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA594-O with the 2N2102, 2N2102A, 2N3250A, 2N4036, 2N4235, 2N4236, 2N5153, 2N5323, 2N6191, 2SA503, 2SA503-O, 2SA512, 2SA512-O, BC161, BC161-10, BC303, BC303-5, BC304, BC304-5 or BC461.