2SA490 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -40 V
• Collector-Base Voltage, max: -50 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -3 A
• Collector Dissipation: 25 W
• DC Current Gain (h_fe): 40 to 240
• Transition Frequency, min: 10 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The 2SA490 transistor can have a current gain of 40 to 240. The gain of the 2SA490-O will be in the range from 70 to 140, for the 2SA490-R it will be in the range from 40 to 80, for the 2SA490-Y it will be in the range from 120 to 240.Sometimes the "2S" prefix is not marked on the package - the 2SA490 might only be marked "A490".The complementary NPN transistor to the 2SA490 is the 2SC790.You can replace the 2SA490 with the 2SA1262, 2SA1488, 2SA1488A, 2SA489, 2SA614, 2SA770, 2SA771, 2SB1017, 2SB1368, 2SB434, 2SB435, 2SB507, 2SB596, 2SB761, 2SB761A, 2SB762, 2SB762A, 2SB942, 2SB942A, 2SB996, BD202, BD204, BD242, BD242A, BD242B, BD244, BD244A, BD244B, BD302, BD304, BD534, BD536, BD538, BD540, BD540A, BD540B, BD738, BD796, BD798, BD800, BD808, BD810, BD934, BD934F, BD936, BD936F, BD938, BD938F, BD950, BD952, BDT82, BDT82F, BDT84, BDT84F, BDX78, D44C10, D44C11, D44C12, D44C4, D44C5, D44C6, D44C7, D44C8, D44C9, D45C10, D45C11, D45C12, D45C4, D45C5, D45C6, D45C7, D45C8, D45C9, KSA614, KSB1017, KSB596 or KTB1368.