BC549CTF

Single Bipolar Transistors Overview

The onsemi BC549CTF is an NPN epitaxial silicon transistor housed in a TO-92 (TO-226AA) through-hole package. It features a maximum collector-emitter voltage of 30V and a continuous collector current of 100mA. The device offers a DC current gain (hFE) range of 420 to 800, ensuring high amplification capabilities. Key electrical parameters include a collector cutoff current of 15nA max, a transition frequency of 300MHz typical, and a power dissipation rating of 500mW.

Single Bipolar Transistors Feature Summary

• High DC current gain for effective signal amplification
• Low noise performance suitable for sensitive circuits
• Complementary pairing with PNP BC559 devices

Single Bipolar Transistors Applications

• General-purpose small signal amplification
• Audio pre-amplifier stages
• Switching applications

Single Bipolar Transistors Procurement Notes

Verify the specific suffix 'CTF' against the official onsemi datasheet to confirm pinout orientation and binning specifications. Ensure the component matches the required hFE gain range and that the TO-92 package dimensions align with the target PCB footprint before finalizing procurement.

Single Bipolar Transistors Selection Notes

Select this component when a high-gain NPN transistor is required for low-power amplification tasks. The BC549C variant provides superior current gain compared to lower bins. Consider the complementary BC559 for designs requiring matched NPN/PNP pairs in push-pull configurations or differential stages.

Single Bipolar Transistors Part Context

This part belongs to the widely used BC546–BC550 series of general-purpose transistors. These components are standard industry replacements for older equivalents like the 2N3904 in low-voltage applications. The series is characterized by its reliability in consumer electronics and industrial control systems.

Single Bipolar Transistors Replacement Considerations

Compatible substitutes include the BC549B from other manufacturers such as Diotec or NXP, provided the hFE gain bin meets the circuit requirements. Verify that alternative sources offer the same TO-92 mechanical outline and thermal characteristics.