2N3439

The 2N3439 is a high-performance NPN transistor engineered for reliable amplification and switching applications. It features robust construction to handle moderate power levels while maintaining dependable electrical characteristics suitable for legacy and serviceable designs. Maximum collector current: 0.8 A Collector-emitter voltage (Vce): 40 V Transition frequency (fT): 100 MHz Power dissipation: 1 W Optimized gain bandwidth product for consistent linear amplification Compared to more recent transistors, the 2N3439 provides a balance of moderate voltage and current ratings with a respectable frequency response. These characteristics make it suitable for small- to medium-signal amplification and switching tasks where proven durability and predictable electrical parameters are important. Application and Design Notes Constructed using established semiconductor materials and techniques, the 2N3439 offers steady performance across a range of frequencies. Its optimized gain and manageable power dissipation suit it for projects that require stable amplification without the thermal and design demands of higher-power parts. Engineers often select this part for maintenance, repair, and designs that favor well-documented, reliable components with known behavior.