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NPN Transistors are widely used in low side switching circuits that work with analog signals, which means that these transistors are used as switches the switches the ground of the circuit on and off. You can easily control the strength of the output signal by controlling the strength of the input current of the transistor.
Collector emitter voltage | 30V |
| Collector base voltage | 30V |
| Emitter base voltage | 5V |
| Collector current | 100mA |
| Operating temperature | -55C ~ 150C |
Datasheet for BC549C