BC317A Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -45 V
• Collector-Base Voltage, max: -50 V
• Emitter-Base Voltage, max: -6 V
• Collector Current − Continuous, max: -0.15 A
• Collector Dissipation: 0.31 W
• DC Current Gain (h_fe): 110 to 220
• Noise Figure, max: 2 dB
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The BC317A is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, base, and collector leads.
Here is an image showing the pin diagram of this transistor.The BC317A transistor can have a current gain of 110 to 220. The gain of the BC317 will be in the range from 110 to 800, for the BC317B it will be in the range from 200 to 450, for the BC317C it will be in the range from 420 to 800.The complementary NPN transistor to the BC317A is the BC320A.The 2SA1162 (SOT-23), 2SA1586 (SOT-323), 2SA1832 (SOT-23), 2SA812 (SOT-23), BC857 (SOT-23), BC857A (SOT-23), BC857AW (SOT-323), BC857W (SOT-323), BC860 (SOT-23), BC860A (SOT-23), BC860AW (SOT-323), BC860W (SOT-323), BCW71 (SOT-23), BCW71LT1 (SOT-23), BCW71LT1G (SOT-23), FJX733 (SOT-323), KSA812 (SOT-23), KTA1504 (SOT-23), KTA1504S (SOT-23) and TMBT3906 (SOT-23) is the SMD version of the BC317A transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BC317A with the 2SA539, 2SA697, 2SA708, BC320, BC320A, BC527, BC527-16, BC528, BC528-16, HS733, KN2907A, KSA539, KSA708, KSA733, KSP2907A, KSP55, KSP56, KSP8598, KSP8599, KTA539, KTA539-O, KTA539-Y, KTC9015, KTC9015B, KTN2907A, MPS2907A, MPS2907AG, MPS4354, MPS4355, MPS4356, MPS751, MPS751G, MPS8598, MPS8598G, MPS8599, MPS8599G, MPSA55, MPSA55G, MPSA56, MPSA56G, MPSW55, MPSW55G, MPSW56, MPSW56G, NTE159, P2N2907A, P2N2907AG, PN200, PN2905A, PN2907A, PN4354, PN4355, PN4356, ZTX550 or ZTX951.