MPS6521 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 25 V
• Collector-Base Voltage, max: 40 V
• Emitter-Base Voltage, max: 4 V
• Collector Current − Continuous, max: 0.1 A
• Collector Dissipation: 0.625 W
• DC Current Gain (h_fe): 300 to 600
• Transition Frequency, min: 300 MHz
• Noise Figure, max: 3 dB
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-92

The MPS6521 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 complementary PNP transistor to the MPS6521 is the MPS6523.You can replace the MPS6521 with the 2N5210, 2N6428, HS945, KSC945, KTC9014, KTC9014C, MPS650, MPS650G, MPS6532, MPS6601, MPS6601G, MPS6602, MPS6602G, MPSW01, MPSW01A, MPSW01AG, MPSW01G, PN100A, S9014, S9014C, SS9014, SS9014C or ZTX690B.