Hybrid Protection Module for Ethernet PHY - SP4031 Series

By Littelfuse

The SP4031 hybrid protector by Littelfuse offers both overcurrent and differential only overvoltage protection for applications such as 10/100/1000 BaseT ports. These hybrid protectors are compliant with the newest standards of overvoltage per industry standard ITU-T K.21, and tested to basic test levels 2.5 kV overvoltage. Flowthrough package layout allows PCB trace routing directly through the SP4031 without changing pitch dimensions, creating less impact on normal signal high-frequency components.

During a prolonged overvoltage event such as a power fault, this component will present a high-impedance. The high-impedance state will reset once the power fault event has ended. During a fast transient event, the component will clamp, protecting any downstream chipsets.

These components can safely absorb up to 35 A per IEC 61000-4-5 2nd edition (tp=8/20 μs) without performance degradation and a minimum ±30 kV ESD per IEC 61000-4-2 International Standard. The low loading capacitance and high surge capability make the SP4031 ideal for protecting telecommunication ports such as Ethernet and other high-speed data interfaces.


ESD, IEC 61000-4-2, ±30 kV contact, ±30 kV air
EFT, IEC 61000-4-4, 40 A (5/50 ns)
Lightning, 35 A (8/20 as defined in IEC 61000-4-5 2nd edition)
Low capacitance of 2.5 pF (at VR=0V)
Moisture sensitivity level (MSL -1)
Lead-free and RoHS compliant
Low parasitic capacitance
Low operating voltage (<3.3 V)
Low breakdown voltage (>3.5 V)
Tested and proven protection solution for high-speed interfaces


10/100/1000 BaseT Ethernet
ITU K.21 basic level compliance
ADSL/VDSL/G.fast modem
Industrial Ethernet
Smart TVs
Consumer electronics

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