STMicroelectronics

STW40NF20

STW40NF20 Description

The STW40NF20 from STMicroelectronics is an N-channel 200V, 40A power MOSFET in a TO-247-3 package, designed for high-efficiency power switching applications. Part of the STripFET™ series, it leverages advanced Metal Oxide Semiconductor (MOSFET) technology to deliver low on-resistance (45mΩ @ 20A, 10V) and high power dissipation (160W @ Tc). With a gate charge (Qg) of 75nC @ 10V and input capacitance (Ciss) of 2500pF @ 25V, it ensures fast switching performance while minimizing losses. Though marked Obsolete, it remains a robust choice for legacy designs requiring high-voltage handling and thermal stability.

STW40NF20 Features

• High Voltage & Current Rating: 200V Vdss and 40A continuous drain current (Id) at 25°C, suitable for demanding power stages.
• Low Rds(on): 45mΩ @ 20A, 10V reduces conduction losses, improving efficiency.
• Optimized Gate Drive: 10V drive voltage ensures full enhancement with minimal gate charge (75nC), enhancing switching speed.
• Thermal Performance: 160W power dissipation (Tc) and TO-247-3 package enable effective heat management.
• Reliability: ROHS3 compliant, REACH unaffected, and MSL 1 (unlimited) for environmental and handling resilience.
• Wide Vgs Range: ±20V gate-source voltage tolerance for flexibility in drive circuits.

STW40NF20 Applications

• Power Supplies: High-efficiency SMPS, PFC circuits, and DC-DC converters benefiting from low Rds(on).
• Motor Control: Ideal for H-bridge inverters and brushless DC motor drives due to high current handling.
• Industrial Systems: UPS, welding equipment, and solar inverters requiring robust voltage/thermal performance.
• Automotive: Legacy designs in 48V systems or high-power switching modules.

Conclusion of STW40NF20

The STW40NF20 excels in high-voltage, high-current applications with its low conduction losses, fast switching, and thermal robustness. While obsolete, its STripFET™ technology and TO-247-3 package make it a reliable choice for engineers maintaining or upgrading legacy systems. Its balance of efficiency, durability, and drive simplicity ensures continued relevance in industrial, automotive, and power electronics.