ASFETs for Power over Ethernet (PoE)

Enhanced SOA, enhanced protection, low RDS(on), and superior power density

The latest high-power 48V Power over Ethernet standard (IEEE 802.3bt) and proprietary approaches are enabling the next generation of PoE systems. Such systems can deliver up to 100 W to each powered device, including large screen LCD displays, 5G pico-cells, advanced Wi-Fi hot-spots and pan-tilt-zoom CCTV cameras. This places increased demands on PoE power sourcing equipment (PSE). Demands that are matched by Nexperia’s dedicated PoE MOSFET family.

ASFETs for Power over Ethernet (PoE) have been specifically designed to complement the latest high-power, PSE controllers:

  • MOSFET’s primary role is to safely manage inrush current when capacitive loads are added to the network
  • Extended enhanced Safe Operating Area (SOA) to withstand power dissipation due to short-circuit fault conditions until the PSE controller detects the fault and switches off 
  • Enhanced protection – our MOSFETs offer more than 2x the protection of competitive devices. During a cable short fault, our ASFETs for PoE can safely dissipate up to 30 W under +60 °C ambient for up to 20 ms  
  • To squeeze more high-power PoE ports into a compact router / switch requires superior power density offered by the thermal efficiency and compact footprint of the LFPAK33 package

Power Sourcing Equipment / Power over Ethernet


Nexperia in action

PSMN075-100MSE, PSMN040-100MSE, PSMN4R8-100BSE MOSFETs referenced in Linear Technology's LTC4279 New PSE Controller datasheet are from our differentiated ASFETs for Hotswap and Soft Start / ASFETs for Power over Ethernet portfolios.


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ASFETs for Power over Ethernet (PoE)
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Type number Description Status Quick access
PSMN040-100MSE N-channel 100 V 36.6 mΩ standard level MOSFET in LFPAK33 designed specifically for high power PoE applications Production
PSMN047-100NSE N-channel 100 V 48 mOhm standard level MOSFET in DFN2020 package, designed specifically for high power PoE applications Development
PSMN075-100MSE N-channel 100 V 71 mΩ standard level MOSFET in LFPAK33 designed specifically for PoE applications Production
Visit our documentation center for all documentation

Marcom graphics (1)

File name Title Type Date
RS2780_PoE_blue-scr POE MarCom image Marcom graphics 2020-09-16

Selection guide (1)

File name Title Type Date
Nexperia_Selection_guide_2021 Nexperia Selection Guide 2021 Selection guide 2021-01-08

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