BC548BU

Single Bipolar Transistors Overview

The BC548BU is an NPN epitaxial silicon planar transistor from onsemi, housed in a TO-92 package. It serves as a general-purpose device for switching and amplifier applications. Key electrical characteristics include a collector-emitter voltage (VCEO) of 30 V, a continuous collector current (IC) of 100 mA, and a maximum power dissipation of 500 mW. The component features a DC current gain (hFE) range of 110 to 800, with the 'B' suffix indicating a specific gain bin typically starting at 200. It operates within a junction temperature range of -65°C to +150°C.

Single Bipolar Transistors Feature Summary

• NPN epitaxial silicon construction with planar design for reliable performance
• Complementary PNP device available in the BC558 series
• Lead-free finish compliant with environmental directives

Single Bipolar Transistors Applications

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

Single Bipolar Transistors Procurement Notes

Verify the manufacturer origin, as onsemi acquired Fairchild Semiconductor; datasheets may bear either brand name. Confirm the 'B' gain bin specification matches circuit requirements. Ensure the TO-92 package variant aligns with board layout constraints. Check RoHS compliance status for the specific production batch.

Single Bipolar Transistors Selection Notes

Select this component when a low-cost, general-purpose NPN transistor with moderate voltage ratings is required. The BC548BU offers a wide hFE spread suitable for various biasing conditions. Consider the BC547 or BC546 if higher voltage tolerance is needed. Verify thermal management capabilities for power dissipation near the 500 mW limit.

Single Bipolar Transistors Part Context

The BC548BU belongs to the widely used BC546/BC547/BC548 family of small-signal transistors. This series is standard in educational and industrial electronics for basic discrete logic and analog functions. The 'U' suffix often denotes specific tape-and-reel packaging or regional distribution variants within the onsemi portfolio.

Single Bipolar Transistors Replacement Considerations

• BC548B
• BC548C
• BC547B

Single Bipolar Transistors FAQ

What is the difference between BC548B and BC548C?

The primary difference is the DC current gain (hFE). The BC548B typically has a lower minimum gain (e.g., 110-200), while the BC548C has a higher minimum gain (e.g., 420-800).

Is the BC548BU lead-free?

Yes, onsemi states that these devices are Pb-free products compliant with RoHS environmental substance directives.

What is the complementary PNP transistor?

The complementary PNP device in this series is the BC558.