Range of discrete FET solutions delivers space-saving PoE ASFETs and MOSFETs

Nexperia has released several new MOSFETs to widen its range of discrete switching solutions for various applications across multiple end markets. This release includes 100V ASFETs for PoE, eFuse and relay replacement in 60% smaller DFN2020 packaging and 40V NextPowerS3 MOSFETs with improved EMC performance.

PoE switches typically have up to 48 ports, each requiring two MOSFETs for protection. With up to 96 MOSFETs on a single PCB, any decrease in device footprint is attractive. For this reason, the company has released 100V PoE ASFETs in 2mm x 2mm DFN2020 packaging, occupying 60% less space than previous versions in LFPAK33 packaging. A critical function of these devices is to protect PoE ports by limiting inrush currents while safely managing fault conditions. To handle this scenario, it has enhanced the SOA of these devices by up to 3x with only a minimal increase in RDS(on). These ASFETs are also suitable for battery management, Wi-Fi hotspots, 5G picocell and CCTV applications and can serve as replacements for mechanical relays in smart thermostats, for example.

EMC-related issues caused by MOSFET switching usually only occur late in the product development life cycle and resolving them can incur additional R&D costs and delay market release. Typical solutions include employing particularly more expensive MOSFETs with lower RDS(on) (to slow down switching and absorb excessive voltage ringing) or to fit an external capacitive snubber circuit, but this approach has the disadvantage of increasing component count. The company has optimised its 40V NextPowerS3 MOSFETs to deliver EMC performance similar to that which can be achieved using an external snubber circuit while also offering higher efficiency. These MOSFETs are suitable for switching converters and motor controllers across various applications and are available in LFPAK56 packaging.

"By introducing these latest additions to our range of discrete FET solutions at APEC 2024, Nexperia showcases how we leverage our expertise in R&D to deliver optimised solutions. Both our new 100V PoE ASFETs as well as improved EMC performance in our 40V NextPowerS3 MOSFETs demonstrate our commitment to supporting engineers in overcoming challenges across diverse applications. These innovations underscore Nexperia's dedication to providing efficient, compact, and reliable solutions that empower our customers to succeed in today's ever-evolving market," says Chris Boyce, MOSFET marketing and product group director at Nexperia.