BC318A Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -30 V
• Collector-Base Voltage, max: -45 V
• Emitter-Base Voltage, max: -5 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 BC318A 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 BC318A transistor can have a current gain of 110 to 220. The gain of the BC318 will be in the range from 110 to 800, for the BC318B it will be in the range from 200 to 450, for the BC318C it will be in the range from 420 to 800.The complementary NPN transistor to the BC318A is the BC321A.You can replace the BC318A with the 2N3906, 2N4403, 2SA539, 2SA696, 2SA697, 2SA708, BC317, BC317A, BC320, BC320A, BC321, BC321A, BC527, BC527-16, HS733, KN2907, KN2907A, KN3906, KSA539, KSA708, KSA733, KSP2907A, KSP55, KSP8598, KTA539, KTA539-O, KTA539-Y, KTC8550, KTC9012, KTC9015, KTC9015B, KTN2907, KTN2907A, MPS2907, MPS2907A, MPS2907AG, MPS2907G, MPS3906, MPS4354, MPS4355, MPS6534, MPS6535, MPS6652, MPS6652G, MPS750, MPS750G, MPS751, MPS751G, MPS8598, MPS8598G, MPSA55, MPSA55G, MPSW51, MPSW51A, MPSW51AG, MPSW51G, MPSW55, MPSW55G, P2N2907A, P2N2907AG, PN200, PN2905, PN2905A, PN2907, PN2907A, PN4354, PN4355, ZTX549, ZTX550, ZTX949 or ZTX951.