The BC557 is a widely used general-purpose PNP transistor mainly used for switching and amplification in low-power electronic circuits. It is commonly used in signal amplification, high-side switching, and complementary circuits along with NPN transistors like BC547/BC548.
Core Component Features
• Transistor Type: PNP Bipolar Junction Transistor (BJT)
• Category: General purpose low-power transistor
• Primary Use: High-side switching + Amplification
• Package Type: TO-92 (through-hole)
• Common in: Analog circuits, switching stages, microcontroller interfacing
Electrical & Interface
• Collector-Emitter Voltage (Vceo): -45V
• Collector Current (Ic Max): -100mA
• Power Dissipation: ~500mW (typical)
• Gain (hFE): Depends on grade (A/B/C variants)
• Pin Type: 3-pin (Collector, Base, Emitter)
Package Includes
• 1 × BC557 PNP Transistor (TO-92)