Single Pair Ethernet

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Component selectionDesign tips

Characteristics

Ethernet is a common interface for cabled networks.
The new standard Single Pair Ethernet (SPE), reaching up to 1000 m, enables many new use cases to replace analog sensor applications or industrial bus systems.
Besides cable length, mechanical connector stability and PCB size reduction were the drivers to create a new standard.

Application Notes

Würth Elektronik is a member of the SPE Industrial Partner Network

The network is an equal association of companies that promote Single Pair Ethernet technology as the basis for rapid and successful growth of the IIoT (Industrial Ethernet of Things).

Go to network

Products of interest

WE-STST Super Tiny Signal Transformer

Single Pair Ethernet from Würth Elektronik eiSos

One Pair is all you need

Single Pair Ethernet embodies a new type of data transmission. Contrary to Multipair Ethernet, only two wires are needed. The small number of wires ensures thinner cable diameters and reduces cost.

By using only one pair of wires, the number of passive components on the PCB is considerably reduced. Together with the very compact connector, Single Pair Ethernet can save up to 75 % PCB space, compared to current Ethernet over RJ45.

The advantages of Single Pair Ethernet

Compact Design

Multi Pair Ethernet vs. Single Pair Ethernet

Diameter & weight

Smaller cable diameter and 30 % of weight reduction

PCB & component space

Significantly lower space consumption on the PCB

Insulation voltage according to IEC 62368-1

Similar to Ethernet over four-pair wires, isolation in accordance with IEC 62368-1 (formerlyIEC 60950) is also specified for Single Pair Ethernet. Capacitors with 50 Volt galvanic isolation apply almost exclusively to automotive Ethernet applications and are not sufficient for industrial applications.

The good news is that the electrical isolation in Single Pair Ethernet can be easily solved by a signal transformer. Our WE-STST transformer series combines excellent performance with a very compact size of only 4.5 x 3.2 mm.

Through connection of the centre tap to GND, common mode signals are also effectively attenuated.