BC549ATA

Single Bipolar Transistors Overview

The BC549ATA is an NPN silicon small-signal transistor manufactured by onsemi. It features a maximum collector-emitter voltage of 30V and a continuous collector current rating of 100mA. The device provides a minimum DC current gain (hFE) of 110 at a collector current of 2mA and Vce of 5V. It is housed in a TO-92 surface-mount package with leaded terminations, suitable for general-purpose amplification and switching applications.

Single Bipolar Transistors Feature Summary

• NPN bipolar junction transistor configuration
• Low noise performance characteristics
• Isolated case connection

Single Bipolar Transistors Applications

• General purpose amplification
• Switching circuits
• Audio signal processing

Single Bipolar Transistors Procurement Notes

Verify the specific suffix 'A' to confirm the hFE binning grade required for the application. Confirm RoHS compliance status as historical data indicates potential non-compliance for certain manufacturing batches. Ensure the TO-92 SMD package variant matches the PCB footprint requirements. Check terminal plating specifications against solderability standards.

Single Bipolar Transistors Selection Notes

Select this component when a low-noise NPN transistor with moderate gain is required. Compare the hFE range against the BC547 or BC548 series if higher or lower gain thresholds are necessary. Consider the thermal dissipation limits relative to the expected operating current. Verify that the 30V breakdown voltage meets the circuit's maximum supply requirements.

Single Bipolar Transistors Part Context

This part belongs to the BC549 family of NPN transistors, which are distinguished from the BC547 and BC548 series by their specific current gain groupings. The 'A' suffix typically denotes a specific hFE range, often starting at a minimum gain of 110. These devices are widely used in consumer electronics and industrial control systems requiring reliable small-signal handling.

Single Bipolar Transistors Replacement Considerations

• BC549B
• BC549C

Single Bipolar Transistors FAQ

What is the minimum DC current gain for the BC549ATA?

The minimum DC current gain (hFE) is 110 when measured at a collector current of 2mA and a collector-emitter voltage of 5V.

Does the BC549ATA have an isolated case?

Yes, the datasheet specifies that the case connection is isolated.

What is the maximum power dissipation?

The maximum power dissipation is rated at 500mW according to Taiwan Semiconductor data, while NXP documentation lists an absolute maximum of 625mW.