BC547 NPN Transistor

The BC547 is one of the most widely recognised general-purpose NPN transistors in hobbyist electronics, valued for its reliability in both switching and amplifying roles across relay drivers, LED drivers, and small audio circuits. Its straightforward TO-92 package makes it easy to identify and work with even for beginners just starting out with circuit building.

With a continuous collector current rating of 800mA and a current gain of up to 800, the BC547 offers plenty of headroom for driving small loads directly or amplifying weak signals in audio and sensor circuits. Its 45V collector-emitter voltage rating gives it a comfortable safety margin for most low-voltage hobbyist projects, making it a dependable first choice for switching and amplifier applications alike.

• General purpose NPN transistor – switching and amplifying applications
• Continuous collector current – up to 800mA
• Collector-emitter voltage – rated up to 45V
• Current gain – up to 800
• TO-92 package – easy to use in prototypes and finished circuits
• Common applications – relay drivers, LED drivers, audio amplifiers

Add a trusted general-purpose switch to your circuit with the BC547 NPN Transistor.