Electronic Products & Technology

Discrete FET solutions save space

EP&T Magazine   

Semiconductors ASFETs eFuse MOSFETs PoE power relay

NEXPERIA 100 V application specific MOSFETs (ASFETs) for PoE, eFuse and relay replacement in 60% smaller DFN2020 packaging, and 40V NextPowerS3 MOSFETs with improved electromagnetic compatibility (EMC) performance. PoE switches typically have up to 48 ports, each requiring 2 MOSFETs for protection. With up to 96 MOSFETs on a single pcb, any reduction in device footprint is attractive. Firm has released 100V PoE ASFETs in 2mm x 2mm DFN2020 packaging which occupies 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 manage this, firm has enhanced the safe operating area (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 hotspot, 5G picocell and CCTV applications and can serve as replacements for mechanical relays in smart thermostats, for example.

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