BC549 NPN Transistor

The BC549 is a low-noise variant of the general-purpose NPN transistor family, purpose-built for applications where signal clarity matters, such as small audio circuits, noise filters, and precision switching tasks. Its low-noise characteristics make it a preferred choice over standard BC-series transistors when working with sensitive audio or signal paths.

Rated for a continuous collector current of 100mA and a current gain of up to 800, the BC549 handles light switching and amplification duties with the same ease as its siblings, while its low-noise design gives cleaner results in audio filters and LED sequence controllers. Housed in the compact TO-92 package, it remains an easy component to work with on breadboards or in finished circuit designs.

• Low-noise general purpose NPN transistor – suited to sensitive audio and signal work
• Continuous collector current – 100mA
• Collector-emitter voltage – rated up to 30V
• Current gain – up to 800 (max)
• TO-92 package – breadboard and PCB friendly
• Common applications – audio noise filters, small signal amplifiers, LED sequencing

Get cleaner signal performance in your circuits with the BC549 NPN Transistor.