Description
BC557 is a PNP transistor hence the collector and emitter will be closed (Forward biased) when the base pin is held at ground and will be opened (Reverse biased) when a signal is provided to base pin. This is where a PNP transistor differs from a NPN transistor, a Logic state (blue colour) is used to toggle between Ground and Signal Voltage (Emitter-Base Voltage VBE)
BC557 Pin Configuration
| Pin Number | Pin Name | Description |
| 1 | Collector | Current flows in through collector |
| 2 | Base | Controls the biasing of transistor |
| 3 | Emitter | Current Drains out through emitter |
Features
- Bi-Polar PNP Transistor
- DC Current Gain (hFE) is 300 maximum
- Continuous Collector current (IC) is 100mA
- Emitter Base Voltage (VBE) is 6V
- Base Current(IB) is 5mA maximum
- Available in To-92 Package
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