News Article

Performance Improved And Space Gained


As a member of the SPE Industrial Partner Network initiative, Würth Elektronik promotes the use of Single Pair Ethernet in industrial applications. 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.

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