BC549B

Single Bipolar Transistors Overview

The Diotec Semiconductor BC549B is a general-purpose NPN bipolar junction transistor (BJT) housed in a TO-92 through-hole package. It features a maximum collector-emitter voltage of 30 V and a continuous collector current rating of 100 mA, with a peak collector current capability of 200 mA. The device dissipates up to 500 mW of power and operates within a junction temperature range of -55°C to +150°C. Electrical characteristics include a minimum DC current gain (hFE) of 200 at IC = 2 mA and VCE = 5 V, a transition frequency (fT) of 300 MHz, and a collector-emitter saturation voltage of 600 mV at IC = 100 mA.

Single Bipolar Transistors Feature Summary

• Offers three distinct DC current gain groups for precise amplification control
• Compliant with RoHS, REACH, and Conflict Minerals regulations
• Designed for commercial and industrial grade applications

Single Bipolar Transistors Applications

• Signal processing circuits
• Electronic switching applications
• General signal amplification

Single Bipolar Transistors Procurement Notes

Verify the specific manufacturer datasheet version before design integration, as specifications may be subject to change without notice. Confirm that the component meets the required AEC-Q101 standards if automotive qualification is necessary, noting that standard versions are commercial/industrial grade. Ensure lead placement during soldering adheres to thermal resistance guidelines to maintain valid power dissipation ratings.

Single Bipolar Transistors Selection Notes

Select this component when a low-voltage NPN transistor with moderate current handling is required for standard commercial or industrial electronics. The BC549B provides a high minimum current gain suitable for sensitive signal amplification tasks. Consider complementary PNP transistors from the BC558 series if push-pull configurations are needed for the circuit design.

Single Bipolar Transistors Part Context

The BC549B belongs to the BC546 through BC549 family of universal NPN transistors manufactured by Diotec Semiconductor. This series shares common mechanical data and packaging options, including TO-92 cases. The 'B' suffix specifically denotes the middle current gain group within the product line, distinguishing it from the lower gain 'A' group and higher gain 'C' group variants.

Single Bipolar Transistors Replacement Considerations

BC548B

Single Bipolar Transistors FAQ

What is the maximum collector-emitter voltage for the BC549B?

The maximum collector-emitter voltage (VCEO) with the base open is 30 V.

Does the BC549B meet automotive reliability standards?

Standard BC549B units are commercial/industrial grade. Automotive-grade versions are available only with specific suffixes such as -Q (AEC-Q101 compliant) or -AQ (in qualification).

What is the typical DC current gain range for the BC549B?

For the BC549B, the DC current gain (hFE) ranges from 200 to 450 when measured at IC = 2 mA and VCE = 5 V.