Nexperia’s new Application-Specific MOSFETs (ASFETs) for hot-swap increase SOA by 166% and slash PCB footprint by 80%


Nexperia’s new Application-Specific MOSFETs (ASFETs) for hot-swap increase SOA by 166% and slash PCB footprint by 80%

August 04, 2021

Nijmegen -- New 80V & 100V devices minimize derating and improve current sharing for optimum performance, high reliability and reduced system cost

Nexperia, the expert in essential semiconductors, today announced new 80 V and 100 V ASFETs with enhanced SOA performance, targeting hot-swap & soft-start applications in 5G telecom systems & 48 V server environments and industrial equipment needing e-fuse and battery protection.

ASFETs are a new breed of MOSFET optimized for use in particular design scenarios. By focusing on specific parameters critical to an application, sometimes at the expense of others that are less important in the same design, new levels of performance can be achieved. The new hot-swap ASFETs use a combination of Nexperia’s latest silicon technology and copper-clip package construction to significantly strengthen the Safe Operating Area (SOA) and minimize PCB area.

Previously, MOSFETs have suffered from the Spirito effect, whereby the SOA performance drops off rapidly due to thermal instability at higher voltages. Nexperia’s rugged, enhanced SOA technology eliminates the ‘Spirito-knee’, increasing SOA by 166 % at 50 V when compared to previous generations in D2PAK.

Another important advancement is the inclusion of 125 °C SOA characteristics on the datasheet. Comments Mike Becker, Senior International Product Marketing Manager at Nexperia: “SOA is traditionally only specified at 25 °C, meaning designers have to derate for operation in hot environments. Our new hot-swap ASFETs include a 125 °C SOA specification, eliminating this time-consuming task and confirming Nexperia’s excellent performance even at elevated temperatures”. 

The new PSMN4R2-80YSE (80 V, 4.2 mΩ) and PSMN4R8-100YSE (100 V, 4.8 mΩ) hot-swap ASFETs are packaged in the Power-SO8 compatible LFPAK56E.  The unique internal copper-clip construction of the package improves thermal and electrical performance whilst substantially reducing footprint size.  The new LFPAK56E products are just 5 mm x 6 mm x 1.1 mm, offering reductions of 80 % and 75 % for PCB footprint and device height respectively, compared to the D2PAK of previous generations. The devices also feature a maximum junction temperature of 175 °C, meeting IPC9592 regulations for telecoms and industrial applications.

Adds Becker: “A further benefit is improved current sharing in high power applications that demand multiple hot-swap MOSFETs to be used in parallel, improving reliability and reducing system cost. Nexperia is widely recognized as the market leader for hot-swap MOSFETs. With these latest ASFETs, we have again raised the bar.”

The new hot-swap ASFETs are the latest devices to be fabricated on Nexperia’s new 8-inch wafer production plant in Manchester, UK, with capacity ready for volume orders. For more information, including product specs and datasheets, please visit

You can also view this new technology in action at Nexperia’s Power Live Event 21 – 23 September

About Nexperia

Nexperia is a leading expert in the high-volume production of essential semiconductors, components that are required by every electronic design in the world. The company’s extensive portfolio includes diodes, bipolar transistors, ESD protection devices, MOSFETs, GaN FETs and analog & logic ICs. Headquartered in Nijmegen, the Netherlands, Nexperia annually ships more than 90 billion products, meeting the stringent standards set by the automotive industry. These products are recognized as benchmarks in efficiency – in process, size, power and performance — with industry-leading small packages that save valuable energy and space.

With decades of experience in supplying to the world’s leading companies, Nexperia has over 12,000 employees across Asia, Europe and the US. Nexperia, a subsidiary of Wingtech Technology Co., Ltd. (600745.SS), has an extensive IP portfolio and is certified to IATF 16949, ISO 9001, ISO 14001 and OHSAS 18001.


Nexperia: Efficiency wins.

For press information, please contact:

Nexperia Agency: BWW Communications

Petra Beekmans, Head of Communications & Branding
Phone: +31 6 137 111 41

Nick Foot, director
Phone: +44-1491-636393