BD140 PNP Transistor (TO-126)

The BD140 is a medium-power PNP bipolar transistor from Fairchild, built for medium-power switching and amplification applications where a bit more current handling is needed than small-signal transistors provide. Its TO-126 package includes a screw hole for heatsink mounting, further boosting its power handling capacity.

Rated for an 80V collector-emitter breakdown and continuous collector current up to 1.5A, the BD140 delivers strong performance in general-purpose switching, audio amplifiers, and SMPS designs. Its gain sits between 63 and 250, flattest in the 10 to 100mA range, meaning high base currents are needed to switch high collector currents efficiently, while a low saturation voltage around 50mV keeps power dissipation down and efficiency high.

• Medium-power PNP transistor – suited to switching and amplification
• 80V collector-emitter breakdown – handles higher voltage applications
• 1.5A continuous collector current – strong current handling
• TO-126 package – screw hole enables heatsink mounting
• Gain range – 63 to 250
• Common applications – general switching, audio amplifiers, SMPS designs

Handle higher-power switching needs with the BD140 PNP Transistor.