The STF21N90K5 is a state-of-the-art N-channel Power MOSFET presented by STMicroelectronics, designed to meet the high-efficiency and energy-saving standards of modern power supply applications. This device is part of the innovative MDmesh™ K5 series which utilizes ST's advanced technology to provide extremely low on-resistance (R_DS(on)) and superior switching performance.

With a drain-source voltage of 900 V, the STF21N90K5 ensures high voltage endurance, making it a suitable choice for applications that require high breakdown voltage. The typical on-resistance of just 0.190 Ohm contributes to its high efficiency, reducing conduction losses and improving overall system performance.

The device boasts a continuous drain current of 20 A at 25°C, which allows for significant current handling capability. This feature, combined with the high voltage rating, makes the STF21N90K5 ideal for a variety of power applications including switch-mode power supplies (SMPS), lighting, welding, solar inverters, and other high-performance converters.

The TO-220FP package is designed to offer a compact form factor while ensuring good thermal performance, making it easy to integrate into various circuit designs without the need for extensive cooling systems. The package is also well-suited for through-hole mounting, which is beneficial for applications requiring strong mechanical anchoring to the PCB.

Additional features of the STF21N90K5 include a low gate charge (Q_g), which reduces the power required to drive the MOSFET, and a low input capacitance (C_iss), which enhances the AC performance. The device is also characterized by a 100% avalanche tested design, ensuring reliability and ruggedness under stressful conditions.

STMicroelectronics' commitment to environmental sustainability is reflected in the STF21N90K5, as it is compliant with the European Union directives RoHS (Restriction of Hazardous Substances) and is 100% lead-free, minimizing the environmental impact.