BC857A Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -45 V
• Collector-Base Voltage, max: -50 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.1 A
• Collector Dissipation: 0.25 W
• DC Current Gain (h_fe): 110 to 220
• Transition Frequency, min: 150 MHz
• Noise Figure, max: 2 dB
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: SOT-23

Here is an image showing the pin diagram of this transistor.The BC857A transistor can have a current gain of 110 to 220. The gain of the BC857 will be in the range from 110 to 800, for the BC857B it will be in the range from 200 to 450, for the BC857C it will be in the range from 420 to 800.The complementary NPN transistor to the BC857A is the BC847A.You can replace the BC857A with the 2SA1162, 2SA1313, 2SA1366, 2SA1518, 2SA1519, 2SA1520, 2SA1521, 2SA1620, 2SA1832, 2SA812, 2SB710A, BC807, BC807-16, BC856, BC856A, BC860, BC860A, BCW68, BCW68F, BCW71, BCW71LT1, BCW71LT1G, BCX17, FMMT2907A, FMMT2907AR, FMMT591, FMMT591Q, FMMTA55, FMMTA56, KN2907AS, KSA812, KST2907A, KST55, KST56, KTA1504, KTA1504S, KTN2907AS, MMBT200, MMBT2907A, MMBT4354, MMBT4355, MMBT4356, MMBTA55, MMBTA56, PMBT2907A, PMBTA56, PMST2907A, SMBTA55, SMBTA56 or TMBT3906.