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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.
BC557 Transistor Pinout 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 |
BC557 Transistor 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
Note: Complete Technical Details can be found at the BC557 datasheet given at the download menu of this page.
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