onsemi FDMT800100DC: 100V Synchronous Rectification MOSFET in DFN 8x8 Package

The relentless pursuit of higher power density and efficiency in modern switch-mode power supplies (SMPS), DC-DC converters, and motor control systems demands power semiconductors that offer a superior blend of performance, thermal management, and miniaturization. Addressing this need, the onsemi FDMT800100DC stands out as a high-performance 100V N-Channel MOSFET engineered specifically for synchronous rectification and high-frequency switching applications.

Housed in the advanced DFN 8x8 package, this MOSFET is a testament to the industry's shift away from larger, less efficient footprints. The package's key advantage is its extremely low package inductance and resistance, which are critical for minimizing switching losses and voltage overshoot during high-speed operation. Furthermore, the exposed copper paddle facilitates exceptional thermal performance by enabling efficient heat transfer directly from the silicon die to the PCB, allowing designers to manage higher power levels in a compact form factor.

The electrical characteristics of the FDMT800100DC are meticulously tailored for its primary role. With a maximum drain-to-source voltage (Vds) of 100V, it is well-suited for popular bus voltages such as 48V in telecom and server infrastructures. Its most defining feature is its very low figure-of-merit (FOM, Rds(on) Qgd). A remarkably low on-resistance (Rds(on)) of just 1.8 mΩ (max. at Vgs=10V) directly translates to reduced conduction losses, while its optimized gate charge ensures swift switching transitions. This combination is paramount for synchronous rectification stages, where the body diode conduction time must be minimized to boost overall system efficiency.

Designers will find this device particularly advantageous in applications including:

Synchronous Rectification in high-current AC-DC and DC-DC power supplies.

Primary-side switching in isolated converters.

OR-ing and hot-swap circuits in server and networking equipment.

Motor drives and inverters for industrial automation.

ICGOOODFIND: The onsemi FDMT800100DC is a top-tier solution for engineers pushing the limits of power design. Its optimal balance of ultra-low Rds(on), superior switching performance, and excellent thermal characteristics in the space-saving DFN 8x8 package makes it an exceptional choice for achieving new levels of efficiency and power density in demanding 100V applications.

Keywords: Synchronous Rectification, DFN 8x8 Package, Low Rds(on), 100V MOSFET, High Frequency Switching