Filter design targets single-pair Ethernet interface

June 16, 2020 //By Julien Happich
Filter design
As a member of the SPE Industrial Partner Network initiative, Würth Elektronik promotes the use of Single Pair Ethernet in industrial applications.

The company has now published a circuit layout with transformers as galvanic isolation. The solution has an isolation of 1.5 kV/60 s and is therefore fully suitable for industrial applications, unlike previous circuits that use two 50 V capacitors as galvanic isolation. The filter solution is extremely compact and ensures signal stability of up to 40m cable length for 100BASE-T1 or up to 1 000 m for 10BASE-T1. The WE-STST transmitter series has a footprint of only 4.5x3.2mm. In addition to the WE-STST transmitter, a common mode choke, the WE-CNSW current-compensated data line filter, improves the EMC behavior already at frequencies from 1MHz without negatively affecting the useful signal. A TVS diode (WE-TVS) provides ESD protection according to IEC 61000-4-2 up to 8 kV.

Würth Elektronik - www.we-online.com


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