Superfet V MOSFETS family target server and telecom applications

From Onsemi comes the 600 V Superfet V family of MOSFETs – FAST, Easy Drive and FRFET – that enable power supplies to meet demanding efficiency regulations such as 80 Plus Titanium, in particular at the challenging 10 per cent load condition.

These new MOSFETS are said by Onsemi to offer “excellent switching characteristics and lower gate noise resulting in enhanced electromagnetic interference performance” which the company states is of significant benefit to server and telecom systems. Additionally, system reliability is enhanced by a robust body diode and elevated VGSS (DC ± 30V).

The FAST versions offer efficiency in hard switching topologies (such as high-end PFC) and are optimised to deliver reduced gate charge (Qg) and EOSS losses to enable fast switching. The initial devices include the NTNL041N60S5H (41m RDS(on)) and NTHL185N60S5H (185m RDS(on)), which are both in a TO-247 package. The NTP185N60S5H is in a TO-220 package and the NTMT185N60S5H is in a 8.0mm x 8.0mm x 1.0mm Power88 package that Omsemi says guarantees MSL 1 and has a Kelvin source configuration to improve gate noise and switching power loss.

The Easy Drive versions suit hard and soft switching topologies and contain an internal gate resistor (Rg) as well as optimised internal capacitance. They are fit for general purpose use in many applications including PFC and LLC. In these devices, the built-in Zener diode between gate and source electrode for over 120m RDS(on) gives less stress on the gate oxide and higher ESD ruggedness leading to better assembly yield and reduced field failures. Two devices are currently available with 99m and 120m RDS(on) – the NTHL099N60S5 and NTHL120N60S5Z are both supplied in a TO-247 package.

The fast recovery (FRFET) versions suit soft switching topologies such as phase-shifted full bridge (PSFB) and LLC. They benefit from a fast body diode and offer reduced Qrr and Trr. The robust diode ruggedness ensures enhanced system reliability. The NTP125N60S5FZ with built-in Zener diode offers 125 m RDS(on) in a TO-220 package while the NTMT061N60S5F offers 61m in a Power88 package. The lowest loss device is the NTHL019N60S5F which has the RDS(on) of just 19m in a TO-247 package.

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