onsemi

FCMT125N65S3

FCMT125N65S3 Description

The FCMT125N65S3 from onsemi is a high-performance N-channel MOSFET designed for demanding power management applications. Part of the SuperFET® III series, it features a 650V drain-to-source voltage (Vdss) and a continuous drain current (Id) of 24A at 25°C (case temperature).** This surface-mount device is housed in a compact 4PQFN package, making it suitable for space-constrained designs. With an Rds(on) as low as 125mΩ at 10V gate drive, it delivers efficient switching performance while minimizing conduction losses.

FCMT125N65S3 Features

• Low On-Resistance: 125mΩ @ 12A, 10V ensures reduced power dissipation and improved thermal performance.
• High Voltage Rating: 650V Vdss makes it ideal for high-voltage applications such as power supplies and inverters.
• Fast Switching: Low gate charge (Qg) of 49nC @ 10V and input capacitance (Ciss) of 1920pF @ 400V enable high-frequency operation.
• Robust Design: ±30V Vgs(max) provides flexibility in gate drive circuits, while RoHS3 compliance ensures environmental safety.
• Thermal Efficiency: 181W max power dissipation (Tc) and MSL 1 (unlimited) rating enhance reliability in harsh conditions.

FCMT125N65S3 Applications

This MOSFET excels in:

• Switched-Mode Power Supplies (SMPS): High efficiency and low Rds(on) optimize performance in AC-DC and DC-DC converters.
• Motor Drives & Inverters: The 650V rating suits industrial motor control and renewable energy systems.
• LED Lighting Drivers: Fast switching reduces losses in high-brightness LED applications.
• Telecom & Server PSUs: Compact footprint and high current handling make it ideal for data center power modules.

Conclusion of FCMT125N65S3

The FCMT125N65S3 combines high voltage capability, low conduction losses, and robust thermal performance, making it a superior choice for power electronics designers. While it is not recommended for new designs, its proven reliability in existing applications ensures continued suitability for high-efficiency systems. Its balance of performance, size, and cost positions it as a competitive solution in industrial, automotive, and energy sectors.