BC549CBU

Single Bipolar Transistors Overview

The BC549CBU is an NPN silicon transistor manufactured by Fairchild Semiconductor, housed in a TO-92 plastic package. It features high DC current gain (hFE) with a C-grade binning range of 200 to 450 and a B-grade range of 110 to 220. The device supports a collector-emitter voltage (VCEO) of 45V, collector-base voltage (VCBO) of 60V, and emitter-base voltage (VEBO) of 5V. Maximum collector current (IC) is rated at 100mA. Thermal resistance from junction to ambient is 200 K/W. Operating temperature ranges from -55°C to +150°C.

Single Bipolar Transistors Feature Summary

• High DC current gain characteristics suitable for amplification applications
• Robust thermal performance with extended operating temperature range
• Standardized TO-92 plastic encapsulation for through-hole mounting

Single Bipolar Transistors Applications

• General-purpose low-power amplification circuits
• Switching applications requiring moderate current handling
• Audio pre-amplifier stages

Single Bipolar Transistors Procurement Notes

Verify the specific suffix 'BU' against official Fairchild or onsemi datasheets to confirm packaging details and tape-and-reel specifications. Ensure the hFE binning (B or C grade) matches circuit requirements for gain consistency. Cross-reference part numbers with current manufacturer portfolios as Fairchild Semiconductor assets are managed by onsemi.

Single Bipolar Transistors Selection Notes

Select this component when high current gain is required for signal amplification without excessive power dissipation. The TO-92 package limits thermal management capabilities compared to surface-mount alternatives. Verify that the 100mA continuous collector current rating suffices for the intended load. Consider the VCEO of 45V for voltage headroom in low-voltage analog designs.

Single Bipolar Transistors Part Context

The BC549 series complements the BC547 and BC548 transistors by offering higher gain variants. While electrically similar in pinout and maximum ratings, the BC549 distinguishes itself through superior hFE performance. This makes it preferable for applications where gain stability and magnitude are critical design parameters over standard general-purpose switching.

Single Bipolar Transistors Replacement Considerations

• BC549C
• BC549B

Single Bipolar Transistors FAQ

What is the difference between BC549B and BC549C grades?

The primary difference lies in the DC current gain (hFE) range. The B grade typically offers an hFE range of 110 to 220, while the C grade provides a higher range of 200 to 450.

Is the BC549CBU compatible with BC547 replacements?

While they share the same pinout and similar voltage/current ratings, the BC549 has significantly higher current gain. Direct substitution may alter circuit bias points if the design relies on specific gain values.