BC558 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.
Package Type: TO-92
Transistor Type: PNP
Max Collector Current(IC): -100mA
Max Collector-Emitter Voltage (VCE): -30V
Max Collector-Base Voltage (VCB): -30V
Max Emitter-Base Voltage (VBE): -5V
Max Collector Dissipation (Pc): 500 Milliwatt
Max Transition Frequency (fT): 100 MHz
Minimum & Maximum DC Current Gain (hFE): 110 to 800
Max Storage & Operating temperature Should be: -65 to +150Centigrade