2SA1635-E Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -80 V
• Collector-Base Voltage, max: -80 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -4 A
• Collector Dissipation: 30 W
• DC Current Gain (h_fe): 100 to 200
• Transition Frequency, min: 12 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.The 2SA1635-E transistor can have a current gain of 100 to 200. The gain of the 2SA1635 will be in the range from 60 to 320, for the 2SA1635-D it will be in the range from 60 to 120, for the 2SA1635-F it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SA1635-E might only be marked "A1635-E".The complementary NPN transistor to the 2SA1635-E is the 2SC4008-E.The BDP952 (SOT-223) is the SMD version of the 2SA1635-E transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA1635-E with the 2SA1010, 2SA1010K, 2SA1077, 2SA1293, 2SA1308, 2SA1329, 2SA1388, 2SA1452, 2SA1452A, 2SA1488A, 2SA1634, 2SA1634-E, 2SA769, 2SA771, 2SB1016, 2SB1016A, 2SB1017, 2SB1018, 2SB1018A, 2SB1090, 2SB1090-K, 2SB1367, 2SB1368, 2SB595, 2SB596, 2SB633, 2SB633-E, 2SB703, 2SB703-Q, 2SB703A, 2SB703A-Q, 2SB708, 2SB708-Y, 2SB747, 2SB747-P, 2SB762A, 2SB870, 2SB942A, 2SB944, 2SB945, 2SB946, 2SB992, 2SB995, 2SB996, BD244B, BD244C, BD538, BD540B, BD540C, BD544B, BD544C, BD546B, BD546C, BD800, BD802, BD810, BD952, BD954, BD956, BDT84, BDT84F, BDT86, BDT86F, BDT88, BDT88F, BDT94, BDT94F, BDT96, BDT96F, BDX78, D44C10, D44C11, D44C12, D45C10, D45C11, D45C12, D45H11, D45H11FP, KSA1010, KSA1010Y, KSB1017, KSB596, KSB708, KSB708-Y, KTA1038, KTA1049, KTB1367, KTB1368, MJE15029, MJE15029G, MJE15031, MJE15031G, MJF15031, MJF15031G or NTE153.