BC557B-AP

Single Bipolar Transistors Overview

The BC557B-AP is a PNP silicon planar epitaxial transistor manufactured by Micro Commercial Components (MCC). It is housed in a TO-92 plastic package and designed for general-purpose switching and amplification applications. The device features a maximum collector current of 100 mA, a collector-emitter voltage rating of 45 V, and a collector-base voltage of 50 V. Power dissipation is rated at 625 mW at 25°C ambient temperature. The component supports an operating temperature range from -55°C to +150°C.

Single Bipolar Transistors Feature Summary

• PNP silicon planar epitaxial construction
• Low current capability suitable for small signal applications
• Lead-free compliant manufacturing process

Single Bipolar Transistors Applications

• General purpose switching circuits
• Small signal amplification stages
• Audio pre-amplifier designs

Single Bipolar Transistors Procurement Notes

Verify the specific suffix 'AP' against the manufacturer's official datasheet to confirm lead-free status and exact electrical tolerances. Confirm availability as distribution channels may list this part as end-of-life or obsolete. Ensure the TO-92 package variant matches your PCB footprint requirements before finalizing procurement orders.

Single Bipolar Transistors Selection Notes

Select this component when a PNP transistor with moderate gain and low voltage ratings is required. Compare hFE ranges against other BC557 variants like the BC557A or BC557C to match circuit sensitivity needs. Verify thermal derating curves if operation exceeds standard ambient temperatures.

Single Bipolar Transistors Part Context

This component belongs to the BC557 series of general-purpose PNP transistors. It serves as the complement to NPN devices such as the BC547. The series is widely used in consumer electronics and industrial control boards for basic signal processing tasks.

Single Bipolar Transistors Replacement Considerations

Compatible substitutes include BC557B from other manufacturers such as NXP or Diotec. Cross-reference pinouts and absolute maximum ratings to ensure functional equivalence without redesigning the surrounding circuitry.