BC557BU

Single Bipolar Transistors Overview

The onsemi BC557BU is a PNP epitaxial silicon transistor housed in a TO-92 (TO-226AA) three-pin through-hole package. It features a maximum collector-emitter voltage of -45 V and a collector-base voltage of -50 V. The device supports a continuous collector current of -100 mA with a maximum power dissipation of 500 mW. The minimum DC current gain (hFE) is specified at 110 under standard test conditions. Operating temperatures range from -55°C to +150°C, ensuring reliability across diverse industrial environments.

Single Bipolar Transistors Feature Summary

• PNP polarity configuration utilizing epitaxial silicon technology for stable switching and amplification performance.
• Robust thermal management capabilities allowing operation up to a junction temperature of 150°C within a compact TO-92 form factor.
• High current gain characteristics suitable for general-purpose signal processing and driver applications.

Single Bipolar Transistors Applications

• General-purpose amplifier circuits requiring PNP signal handling.
• Switching applications in low-power digital logic interfaces.
• Driver stages for relay or LED control systems.

Single Bipolar Transistors Procurement Notes

Verify the specific suffix 'BU' against the manufacturer's official datasheet to confirm packaging type and binning specifications. Ensure compatibility with RoHS directives if required by the target application. Cross-reference absolute maximum ratings with circuit design limits to prevent thermal overstress during operation.

Single Bipolar Transistors Selection Notes

Select this component when a PNP transistor with moderate voltage ratings and high current gain is required. Compare hFE bins against circuit sensitivity requirements. Consider the TO-92 package constraints for thermal dissipation in enclosed designs. Verify lead-free compliance status for environmental regulations.

Single Bipolar Transistors Part Context

The BC557BU belongs to the BC557 series of PNP transistors, which are widely used as complementary counterparts to NPN devices like the BC547. This series is established for general-purpose analog and digital switching tasks. The BU suffix typically denotes specific packaging or tape-and-reel configurations within the broader BC557 family lineup.

Single Bipolar Transistors Replacement Considerations

Compatible substitutes include BC557BTA and BC557ATA from onsemi, provided pinout and electrical ratings match. Other manufacturers offer equivalent parts such as MMBT3906 or 2N3906, though parameter variations may exist.