BC321 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 800
• Noise Figure, max: 10 dB
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The BC321 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 BC321 transistor can have a current gain of 110 to 800. The gain of the BC321A will be in the range from 110 to 220, for the BC321B it will be in the range from 200 to 450, for the BC321C it will be in the range from 420 to 800.The complementary NPN transistor to the BC321 is the BC318.You can replace the BC321 with the BC317, BC318, BC320, KSP55, KTC9015, MPS6535, MPS6652, MPS6652G, MPS750, MPS750G, MPS751, MPS751G, MPSA55, MPSA55G, MPSW51, MPSW51A, MPSW51AG, MPSW51G, MPSW55 or MPSW55G.