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Compact Design
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.
Single Pair Ethernet
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.
But what does this mean for the circuit on the PCB?
Insulation voltage according to IEC 62368-1
Similar to Ethernet over four-pair wires, isolation in accordance with IEC 62368-1 (formerly IEC 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. Wurth Elektronik's WE-STST transformer series combines excellent performance with a very compact size of only 4.5 x 3.2 mm.
Through connection of the center tap to GND, common mode signals are also effectively attenuated
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Single Pair Ethernet from Würth Elektronik eiSos
Würth Elektronik eiSos offers the full industry fitting solution for Single Pair Ethernet on the PCB. The SPE design is fully compliant with IEEE 802.3 signal requirements while also fulfilling Ethernet safety requirements for 1.5 kV isolation.
Support Notes
Additional EMI and ESD protection
In addition to the transformer (74930000), a common mode choke (744232222) improves the EMI behavior even at frequencies from 1 MHz without negatively affecting the data signal. The TVS diode (824012823) provides ESD protection according to IEC 61000-4-2 up to 8 kV.
Diagram 10BASE-T1
Diagram 100BASE-T1
Measurement results 10BASE-T1
Measurement results 10BASE-T1
Measurement results 100BASE-T1
Measurement results 100BASE-T1
Product Overview
WE-TVS
TVS Diode
WE-TVS series are high-performance TVS diodes which include surge rated diodes to protect data lines.
WE-CNSW
Common Mode Choke
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The great advantage of the WE-CNSW series is the high suppression of common mode EMI noise at high frequencies, while not influencing the data signal of the interface.
WE-STST
Signal Transformer
WE-STST Super Tiny Signal Transformers for LAN interfaces feature a maximum component height of 2.9 mm and can be used in up to 1000Base-T applications with at least 350 µH inductance.
WCAP-CSMH
Capacitors
-1,35mm_BN.jpg "WCAP-CSMH")
WCAP-CSMH series of MLCCs is designed for rated DC voltages from 200 V to 630 V mid-voltage level up to 1 kV to 3 kV high-voltage level.
WCAP-CSGP
Capacitors
-0,95mm_BN.jpg "WCAP-CSGP")
The WCAP-CSGP Series is a MLCC capacitor made of high performance ceramic.
Würth Elektonik is a member of the SPE Industrial Partner Network
The SPE Industrial Partner 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).
For future users it is the first point of contact for all questions concerning the construction of SPE networks and devices. It provides clear recommendations for the development of future IIoT applications and is the central information and exchange platform.
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