The JZT955 is a PNP power transistor manufactured by JieJie. It is a 4A 140V SOT-223 RoHS compliant component with rated collector dissipation of 140W. It is designed in horizontal or vertical dip configuration with a low on resistance of 0.09? and high voltage of 600V. The maximum collector current is 4A and the minimum collector current is 1A. It also features low voltage noise, fast turn-on and turn-off times, wide range temperature coefficient, and low thermal resistance. The transistor is suitable for various DC-to-DC conversion circuits, in-line voltage regulators, voltage suppression circuits, switchmode power supplies, and other applications.