FDMS0312AS

The FDMS0312AS is an N-Channel enhancement-mode MOSFET (Metal Oxide) manufactured by On Semiconductor. It is designed for power management applications requiring high efficiency and low conduction losses. The device is rated for a maximum drain-to-source voltage (Vdss) of 30 V and can handle continuous drain currents of 18 A at ambient temperature (Ta) and 22 A at case temperature (Tc). Its low on-resistance of 5 mOhm (maximum) at Id=18 A, Vgs=10 V minimizes power dissipation, enhancing overall system efficiency. The gate threshold voltage (Vgs(th)) is 3 V maximum at Id=1 mA, and the device can be driven with gate voltages up to ±20 V. For optimal performance, the drive voltage is specified at 4.5 V for maximum Rds(on) and 10 V for minimum Rds(on). The gate charge (Qg) is 31 nC maximum at Vgs=10 V, and input capacitance (Ciss) is 1815 pF maximum at Vds=15 V, indicating moderate switching speed.

This MOSFET is housed in a compact 8-PowerTDFN surface-mount package, with a supplier device package of 8-PQFN (5x6 mm). It is designed for surface-mount assembly, suitable for automated pick-and-place processes. The maximum power dissipation is 2.5 W at ambient temperature and 36 W at case temperature, requiring adequate thermal management for high-power applications. The operating junction temperature range is -55°C to 150°C, allowing use in a wide range of environments.

Applications include DC-DC converters, power supply circuits, load switching, and battery management systems where low on-resistance and high current capability are required. The N-Channel configuration makes it suitable for low-side switching in synchronous buck converters and other power topologies.