BC556BBU

Single Bipolar Transistors Overview

The BC556BBU is a PNP silicon epitaxial planar transistor manufactured by onsemi, designed for switching and audio frequency amplifier applications. It features a maximum collector-emitter voltage of 65 V and a continuous collector current of 100 mA. The device is housed in a lead-free TO-92-3 through-hole package with a power dissipation rating of 500 mW. The 'B' suffix indicates a specific DC current gain (hFE) binning range, typically providing higher amplification than the standard 'A' grade. It operates at a maximum junction temperature of +150°C.

Single Bipolar Transistors Feature Summary

• PNP polarity configuration suitable for complementary circuit designs paired with NPN counterparts like the BC546 series.
• Epitaxial planar silicon construction ensures stable performance and reliability in general-purpose applications.
• Lead-free packaging complies with environmental directives such as RoHS standards.

Single Bipolar Transistors Applications

• General-purpose switching circuits
• Audio frequency (AF) amplifier stages
• Complementary pairs with NPN transistors

Single Bipolar Transistors Procurement Notes

Verify the manufacturer date code and lot traceability upon receipt to ensure component authenticity. Confirm that the received units match the BC556BBU designation, specifically checking for the correct hFE binning associated with the 'B' suffix. Inspect the TO-92 package for physical integrity and verify lead-free compliance markings on the component body or documentation.

Single Bipolar Transistors Selection Notes

Select the BC556BBU when a PNP transistor with a 65V breakdown voltage and moderate current handling is required. The 'B' suffix offers tighter gain control compared to the 'A' variant, making it suitable for applications requiring consistent amplification factors. Ensure the thermal management design supports the 500 mW dissipation limit within the operating temperature range.

Single Bipolar Transistors Part Context

This component belongs to the widely used BC556/BC546 family of small-signal transistors. The BC556 series serves as the PNP complement to the BC546 NPN series, facilitating symmetrical circuit design. The BC556BBU specifically denotes the B-grade gain binning within this lineage, maintaining the same electrical ratings as other BC556 variants while offering different amplification characteristics.

Single Bipolar Transistors Replacement Considerations

Direct substitutes include BC556BU, BC556B, and BC556BT from various manufacturers. Complementary replacements are available in the BC546 series (e.g., BC546BBU). Verify pinout compatibility (Emitter-Base-Collector or Base-Collector-Emitter depending on manufacturer) before substitution.