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Nexperia introduces first application-specific MOSFETs (ASFETs) for hotswap

Nexperia has released its first 80 V and 100 V application-specific MOSFETs (ASFETs) for hotswap with an enhanced safe operating area (SOA) in a compact 8x8 mm LFPAK88 package.

These new ASFETs are fully optimised for demanding hotswap and soft-start applications and are qualified to 175°C for use in advanced telecom and computing equipment.

Nexperia’s PSMN2R3-80SSE (100 V, 2.3 mΩ N-channel ASFET) delivers low RDS(on) and strong linear-mode (safe operating area) performance in a compact 8x8 mm footprint, tailored to meet the requirements of demanding hotswap applications.

Nexperia has also released the PSMN1R9-100SSE (80 V, 1.9 mΩ), an 80 V ASFET which responds to the growing trend for using 48 V power rails in computing servers and other industrial applications where environmental conditions allow for MOSFETs with a lower BVDS rating.

ASFETs with enhanced SOA are increasingly popular within hotswap and soft start applications. Their strong linear mode performance is essential to manage in-rush current effectively and reliably when capacitive loads are introduced to the live backplane. Low RDS(on) is also important to minimise I2R losses when the ASFET is fully turned on.

Despite the lower RDS(on) and compact package size, Nexperia’s third generation of enhanced SOA technology also achieves 10% SOA improvement compared to previous generations in D2PAK packages (33 A vs 30 A @ 50 V @ 1 ms).

Another innovation is that the ASFETs for hotswap have fully characterized SOA at both 25 °C and 125 °C. Fully tested, hot SOA curves are provided within the datasheets, removing the need for design engineers to perform thermal de-rating calculations, and significantly extending the useful hot SOA performance.

Until now, ASFETs for hotswap and computing applications were limited to much bigger D2PAK packages (16x10 mm). LFPAK88 packages are a suitable replacement for D2PAK, providing up to 60% space efficiency. The PSMN2R3-100SSE has an RDS(on) of only 2.3 mΩ, representing at least a 40% reduction on currently available devices. This results not only in power density improvements of 58x, but the LFPAK88 also offers two times higher ID (max) current rating, ultra-low thermal and electrical resistance.

Nexperia also offers a range of 25 V, 30 V, 80 V & 100 V ASFETs in a 5x6 mm LFPAK56E package, optimised for lower power applications where smaller PCB footprint is needed.