2SB857-C Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -50 V
• Collector-Base Voltage, max: -70 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -4 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 100 to 200
• Transition Frequency, min: 15 MHz
• Operating and Storage Junction Temperature Range: -45 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The 2SB857-C transistor can have a current gain of 100 to 200. The gain of the 2SB857 will be in the range from 60 to 320, for the 2SB857-B it will be in the range from 60 to 120, for the 2SB857-D it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SB857-C might only be marked "B857-C".The complementary NPN transistor to the 2SB857-C is the 2SD1133-C.The NZT660 (SOT-223) is the SMD version of the 2SB857-C transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SB857-C with the 2SA1010, 2SA1010K, 2SA1012, 2SA1262, 2SA1279, 2SA1289, 2SA1289-R, 2SA1290, 2SA1290-R, 2SA1291, 2SA1291-R, 2SA1293, 2SA1307, 2SA1308, 2SA1328, 2SA1329, 2SA1388, 2SA1451, 2SA1451A, 2SA1452, 2SA1452A, 2SA1469, 2SA1469-R, 2SA1470, 2SA1470-R, 2SA1471, 2SA1471-R, 2SA1488, 2SA1488A, 2SA1634, 2SA1634-E, 2SA1635, 2SA1635-E, 2SA1742, 2SA1742-M, 2SA1743, 2SA1743-M, 2SA1744, 2SA1744-M, 2SA1931, 2SA489, 2SA768, 2SA769, 2SA770, 2SA771, 2SB1016, 2SB1016A, 2SB1017, 2SB1018, 2SB1018A, 2SB1019, 2SB1090, 2SB1090-K, 2SB1097, 2SB1097-K, 2SB1134, 2SB1134-R, 2SB1135, 2SB1135-R, 2SB1136, 2SB1136-R, 2SB1367, 2SB1368, 2SB553, 2SB565, 2SB565-C, 2SB566, 2SB566-C, 2SB566A, 2SB566A-C, 2SB595, 2SB596, 2SB633, 2SB633-E, 2SB703, 2SB703-Q, 2SB703A, 2SB703A-Q, 2SB707, 2SB707-Y, 2SB708, 2SB708-Y, 2SB747, 2SB747-P, 2SB762, 2SB762A, 2SB824, 2SB824-R, 2SB825, 2SB825-R, 2SB826, 2SB826-R, 2SB858, 2SB858-C, 2SB870, 2SB942, 2SB942A, 2SB944, 2SB945, 2SB946, 2SB992, 2SB993, 2SB995, 2SB996, BD204, BD244A, BD244B, BD244C, BD304, BD536, BD538, BD540A, BD540B, BD540C, BD544A, BD544B, BD544C, BD546A, BD546B, BD546C, BD798, BD800, BD802, BD808, BD810, BD950, BD952, BD954, BDT82, BDT82F, BDT84, BDT84F, BDT86, BDT86F, BDT92, BDT92F, BDT94, BDT94F, BDT96, BDT96F, BDX78, D44C10, D44C11, D44C12, D44C7, D44C8, D44C9, D45C10, D45C11, D45C12, D45C7, D45C8, D45C9, D45H11, D45H11FP, D45H8, KSA1010, KSA1010Y, KSB1017, KSB1097, KSB1097-Y, KSB596, KSB707, KSB707-Y, KSB708, KSB708-Y, KTA1038, KTA1049, KTB1367, KTB1368 or NTE153.