Bc 239 NPN

The BC 239 NPN transistor is a reliable silicon semiconductor designed for amplification and switching in small-signal circuits. Its combination of moderate voltage and current ratings, high gain, and good frequency response makes it suitable for audio, communication and general-purpose electronic applications where low noise and stable performance are required. Collector-Emitter Voltage: up to 40 V. Collector Current: up to 100 mA. Current Gain (hFE): typically in the 100–300 range. Transition Frequency (fT): effective operation up to 100 MHz. Package Type: TO-18 metal can for enhanced thermal dissipation and durability. Constructed with silicon technology, the BC 239 delivers stable electrical characteristics across varying temperatures and operating conditions. Its elevated gain and frequency performance support precise amplification, while the metal TO-18 casing improves heat dissipation and mechanical robustness compared with plastic-packaged alternatives. Low intrinsic noise and consistent behavior make this transistor a preferred choice for audio preamplifiers, small-signal stages and other circuits where fidelity and repeatable performance matter.