Package Type: TO-92 (through-hole) and other packages (SOT-23, SOT-223, etc.)
Polarity: PNP
Electrical Characteristics
Collector-Emitter Voltage (Vce): -45 V (maximum)
Emitter-Base Voltage (Veb): -5 V (maximum)
Collector Current (Ic): -100 mA (maximum)
Power Dissipation (Pd): 500 mW (at 25°C)
DC Current Gain (hFE): 100 to 600 (depending on Ic)
Transition Frequency (fT): 100 MHz (typical at Ic = 10 mA)
Thermal Characteristics
Operating Junction Temperature (Tj): -55 to +150 °C
Storage Temperature (Ts): -55 to +150 °C
Electrical Characteristics (at 25 °C)
Collector Cut-Off Current (Icbo): -0.1 µA (maximum at Vce = -45 V)
Emitter Cut-Off Current (Ie): -0.1 µA (maximum at Veb = -5 V)
Base-Emitter Cut-Off Current (Iebo): -0.1 µA (maximum at Veb = -5 V)
Collector-Emitter Saturation Voltage (Vce(sat)): -0.25 V (maximum at Ic = -10 mA)
Base-Emitter Voltage (Vbe): -0.7 V (typical at Ic = -10 mA)
Recommended Operating Conditions
Collector Current (Ic): up to -100 mA
Base Current (Ib): Typically less than 5 mA
Features
Low Noise: Suitable for low-noise applications.
High Voltage Rating: Can be used in circuits requiring high voltage handling.
Complementary Pair: Often used with NPN transistor types like BC547.
Applications
Amplifiers: Used in audio and RF amplification circuits.
Switching: Suitable for switching applications in various electronic circuits.
Signal Processing: Used in analog signal processing circuits.
Pin Configuration (TO-92 Package)
Emitter (E): The terminal through which current flows out.
Base (B): The control terminal that modulates the current.
Collector (C): The terminal through which current flows in.
Important Notes
Ensure proper heat sinking if the power dissipation exceeds the specified limit.
Handle with care to avoid static damage.
Follow proper biasing techniques to ensure optimal operation in amplifying or switching configurations.
Typical Application Circuit
A common application involves using the BC557 as a switch, where a small current at the base controls a larger current flowing from the collector to the emitter.
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