Performance improved and space gained

For safe use in industrial applications, Würth Elektronik 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.

Würth Elektronik has published the first industrial SPE circuit that is fully compatible with the IEEE-802.3-signal requirements and the requirement of a 1.5 kV safety insulation according to IEC 62368-1. The filter solution is extremely compact and ensures signal stability of up to 40 m cable length for 100BASE-T1 or up to 1 000 m for 10BASE-T1.

Würth Elektronik's innovative approach: Instead of using capacitors, electrical isolation is achieved by means of a signal transformer. The WE-STST transmitter series is optimized for the signal bandwidth of Single Pair Ethernet and takes up very little space on the circuit board with only 4.5 x 3.2 mm. 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 1 MHz without negatively affecting the useful signal. A TVS diode (WE-TVS) provides ESD protection according to IEC 61000-4-2 up to 8 kV.

Further information on the industrial use of Singe Pair Ethernet can be found on the Würth Elektronik homepage and in this webinar recording on the topic "Single Pair Ethernet - Filter Design". All passive components used in the layout developed by Würth Elektronik are available from stock. Free samples can be requested.

https://www.we-online.de/web/en/electronic_components/termine_pbs/webinare_6/einzelne_webinaraufzeichnungen/passive_bauelemente/hf_bauteile___signaluebertrager/singlepairethernet_filterdesign.php