BC557 is a PNP transistor hence the collector and emitter will be closed when the base pin is held at ground and will be opened when a signal.
- 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