BC317B 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): 200 to 450
• Noise Figure, max: 2 dB
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The BC317B 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 BC317B transistor can have a current gain of 200 to 450. The gain of the BC317 will be in the range from 110 to 800, for the BC317A it will be in the range from 110 to 220, for the BC317C it will be in the range from 420 to 800.The complementary NPN transistor to the BC317B is the BC320B.The 2SA1037 (SOT-23), 2SA812 (SOT-23), BC857 (SOT-23), BC857B (SOT-23), BC857BW (SOT-323), BC857W (SOT-323), BC860 (SOT-23), BC860B (SOT-23), BC860BW (SOT-323), BC860W (SOT-323), BCW72 (SOT-23), BCW72LT1 (SOT-23), BCW72LT1G (SOT-23), FJX733 (SOT-323) and KSA812 (SOT-23) is the SMD version of the BC317B transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BC317B with the BC320, BC320B, BCX79, HS733, KSA733, KSP55, KSP56, KTC9015, KTC9015C, MPS4354, MPS751, MPS751G, MPSA55, MPSA55G, MPSA56, MPSA56G, MPSW55, MPSW55G, MPSW56, MPSW56G, NTE193, PN200 or PN4354.