2N5294

Medium-power NPN silicon epitaxial-base bipolar junction transistor (BJT) housed in a plastic TO-220AB package, optimized for general-purpose audio power amplification and low-frequency power switching. Equivalents: 2N5296, TIP31, BD139, NTE184. Real-Life Examples: Mid-1970s consumer stereo receiver output stages, linear series voltage regulators, and low-voltage industrial DC motor controllers.