BC557,112

Single Bipolar Transistors Overview

The BC557,112 is a PNP general-purpose small-signal transistor manufactured by NXP Semiconductors. It operates with a maximum collector current of 100 mA and a collector-emitter voltage of -45 V. The device utilizes a TO-92 (SOT54) plastic package with three leads. DC current gain ranges from 125 to 800 depending on the specific sub-type. Thermal resistance from junction to ambient is 250 K/W. Transition frequency reaches 100 MHz at specified bias conditions.

Single Bipolar Transistors Feature Summary

• Designed for low-voltage and low-current general-purpose switching and amplification applications.
• Constructed using silicon planar epitaxial technology within a standard through-hole plastic package.
• Offers high DC current gain suitable for signal processing tasks.

Single Bipolar Transistors Applications

• General purpose switching circuits
• Audio frequency amplification stages
• Signal processing applications

Single Bipolar Transistors Procurement Notes

Verify the exact ordering suffix against the manufacturer's official documentation to ensure correct binning and specifications. Confirm that the component status remains active for production use. Check for RoHS compliance markers as indicated in the datasheet. Ensure the package type matches the required PCB footprint. Validate the revision date of the data sheet for any recent technical updates.

Single Bipolar Transistors Selection Notes

Select this component when a PNP transistor with moderate voltage ratings and high current gain is required. Compare the hFE bin requirements against the application needs, as gain varies significantly between sub-types. Consider the thermal resistance limits for power dissipation in the target environment. Verify compatibility with the NPN complement BC547 if complementary pairs are needed.

Single Bipolar Transistors Part Context

This part belongs to the BC556/BC557 family of PNP general-purpose transistors produced by NXP Semiconductors. The series is widely used in discrete semiconductor designs requiring reliable small-signal performance. The BC557 variant specifically offers higher voltage tolerance than the BC556 but lower than the BC558.

Single Bipolar Transistors Replacement Considerations

The BC556 serves as a lower voltage alternative within the same family. The BC558 provides higher voltage ratings. For NPN counterparts, the BC547 is the direct complement. Verify pinout compatibility when substituting with other TO-92 PNP transistors.