Central Semiconductor Corp. Bipolar Transistors - BJT BD440

The BD440 is a PNP silicon power transistor in a TO-126 package, designed for medium power, low speed switching applications. It has a collector-base voltage rating of 60 V, a collector-emitter voltage rating of 60 V, and a continuous collector current of 4.0 A. The device dissipates up to 36 W and operates with a junction temperature range of -65 to +150 °C. Thermal resistance from junction to case is 3.5 °C/W. It features a VCE(sat) of 0.8 V at IC=2.0 A and IB=200 mA, and an hFE of 15 to 25 at IC=2.0 A. The TO-126 case has three leads: emitter, collector, and base.