BC549A

Single Bipolar Transistors Overview

The Diotec Semiconductor BC549A is a general-purpose NPN silicon bipolar junction transistor (BJT) housed in a TO-92 through-hole package. It features a collector-emitter breakdown voltage of 30 V and supports a maximum DC collector current of 100 mA with a peak current rating 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 gain-bandwidth product of 300 MHz, an emitter-base voltage of 5 V, and a minimum DC current gain (hFE) of 110 at 2 mA.

Single Bipolar Transistors Feature Summary

• Offers three distinct current gain groups for precise amplification control
• Designed for universal application in signal processing, switching, and amplification tasks
• Compliant with RoHS directives without exemptions and REACH regulations

Single Bipolar Transistors Applications

• Signal processing circuits
• Electronic switching applications
• Amplification stages
• Commercial and industrial grade equipment

Single Bipolar Transistors Procurement Notes

Verify the specific ordering suffix when purchasing. Suffixes such as -Q indicate AEC-Q101 compliance, while -AQ denotes qualification status. Confirm packaging requirements, as standard versions are supplied in ammo packs, whereas bulk options may require specific requests. Ensure the component meets the required reliability standards for your intended commercial or industrial environment before finalizing orders.

Single Bipolar Transistors Selection Notes

Select the BC549A when a low-voltage NPN transistor with a 30 V collector-emitter rating is required. This model provides a minimum hFE of 110 at 2 mA, making it suitable for moderate gain applications. Consider the complementary BC559 PNP transistor if a matched pair is needed. Verify that the 500 mW power dissipation capability aligns with your thermal management design constraints.

Single Bipolar Transistors Part Context

The BC549A belongs to the BC546 through BC549 series of general-purpose NPN transistors manufactured by Diotec Semiconductor. These components share identical electrical ratings but differ in their DC current gain groupings. The BC549A specifically represents one of the defined gain tiers within this family, designed for standard commercial and industrial electronic applications requiring reliable switching and amplification performance.

Single Bipolar Transistors Replacement Considerations

BC548A

Single Bipolar Transistors FAQ

What is the maximum collector-emitter voltage for the BC549A?

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

Does the BC549A support automotive applications?

Standard versions are for commercial/industrial use. Automotive-grade variants are available with specific suffixes indicating AEC-Q101 compliance or qualification.

What is the typical gain-bandwidth product?

The gain-bandwidth product (fT) is typically 300 MHz under specified test conditions.