Design Support Tools Use our suite of tools to help select, analyze and compare inductors Parametric Search View our list of inductors and filter results based on your exact parameters Looking for a datasheet? Search by product and download a PDF FREE Samples Get free samples quickly - most orders ship the same day! Looking for a datasheet? Search by product and download a PDF. Student Support Learn more about magnetics, request free samples or ask our engineers a question. Single Pair Ethernet Magnetics Solutions Why Single Pair Ethernet (SPE)? Single Pair Ethernet (SPE) is a networking technology that utilizes a single twisted pair of wires for communication. Traditionally, Ethernet connections have used multiple pairs of wires, but the demand for more compact, lightweight solutions has led to the development and adoption of SPE. What is 10BASE-T1L? 10BASE-T1L is a SPE standard defined by IEEE 802.3cg. It is designed for long-distance communication, supporting up to 1,000 meters at 10 Mbps over a single twisted pair cable. This makes 10BASE-T1L an ideal solution for industrial automation systems, building automation and long-distance sensor in IoT networks. Typical Applications — 10Base-T1L with Power over Data Lines (PoDL) A key feature of 10BASE-T1L is its ability to support Power over Data Lines (PoDL), where both data and power are transferred over a single twisted pair. This significantly reduces wiring complexity and installation costs in systems such as: Industrial sensors (temperature, pressure, flow) Building automation (lighting, HVAC, monitoring) Remote I/O modules and smart actuators Figure 1 is a block diagram of a typical 10Base-T1L system using PoDL in industrial, building and factory automation applications. The system consists of a Physical Layer (PHY) device on both the controller and sensor side, Power Sourcing Equipment (PSE), a Powered Device (PD) and the power/data transmission section between the two. PHYs (on both sensors and controller sides): responsible for encoding and decoding Ethernet data signals to accommodate long-range, low-power communication (up to 1,000 meters). PSE (Power Sourcing Equipment): supplies power to remote PD device through the same twisted pair used for data communication. PD (Powered Device): receives both power and data from the PSE over the same twisted pair. In 10Base-T1L with PoDL applications, it is typically a low-power industrial or building automation device that requires both power and data communication over a single twisted pair. Common mode choke (CMC): attenuates common mode noise while allowing differential Ethernet data signals to pass through. Power injection choke (PIC): injects DC power onto the data line while allowing AC Ethernet signals to pass through without distortion. Typically it is placed in series with the differential pair on the PSE side to ensure efficient power transfer. It also can be used on the PD side to extract DC power from the data line. Isolation transformer (ISO XFMR): provides galvanic isolation between the Ethernet PHY and the cable. This is only required when safety is critical and isolation is needed for the application. Figure 1 – 10BASE-T1L with PoDL System Block Diagram 10Base-T1L can also be implemented without PoDL, only for data transmission. In these applications, the system would only transmit Ethernet data over a single twisted pair, without injecting DC power onto the same line. A single common mode choke is required to filter out common mode noise and reduce EMI (Figure 2). Figure 2 – Implementation of 10Base-T1L for data-only transmission Coilcraft Recommended Products What is 10BASE-T1S? 10BASE-T1S is a Single-Pair Ethernet (SPE) standard that utilizes a bus technology with multidrop nodes from a single cable. By implementing Power over Data Line (PoDL) technology via SPE, you not only eliminate the multiple cables and switches needed for standard 802.3 applications, you also eliminate the additional power cables to the nodes on the bus. Figure 6 – PoDL solution does not require a transformer for isolation For ~1.5 A The 33 µH Coilcraft components in this table can be used as both the common mode and differential mode filters shown in Figure 2. Specific selections are based on the desired injected current level. Space-saving Differential Power Injection Inductors and Common Mode Chokes for 10BASE-T1S To validate the performance of these components in 10BASE-T1S PoDL applications, the schematic in Figure 2 was implemented. On the PHY path, a Coilcraft 1210ETH-244 was used as a data only common mode choke. On the PSE / PD path, the different components in the table were connected in common mode / differential mode. Return Loss (Sdd11) and Insertion Loss (Sdd21) were then generated between the microcontroller differential pair and the data point differential pair. Return Loss (Sdd11) What is 100BASE-T1S? 100BASE-T1 is a single pair Ethernet (SPE) standard that provides 100 Mbps full-duplex communication with a maximum length of 15 m over a single twisted pair. It is designed primarily for automotive networks, but it is also adapted to connect local sensors or machines to nearby controllers in industrial or building systems. Typical Applications — 100Base-T1 with Power over Data Lines (PoDL) When PoDL is not used, the twisted pair carries only data signal. The design requires just a CMC with capacitors. This is the simplest implementation and is commonly used when external or onboard power is already available (Figure 9). What is 10GBASE-T1? 10GBASE-T1 requires high speed signal transmission over a single twisted pair while maintaining signal integrity and isolation. Wideband transformers play a key role by providing galvanic isolation and supporting the wide frequency range needed for 10 Gbps communication. For applications where a compact solution is important, our YA9308-AE Mini Wideband Transformer offers full isolation and high frequency performance in a small package, making it ideal for space-constrained automotive or industrial applications. Our parts meet IEEE 802.3cg standards Validated with major PHY for reference designs from Texas Instruments, Analog Devices, etc. Solutions for both long reach with isolation and short reach with compact power injection Target application in industrial automation, building control, and IoT where simplified cabling and long-range communication is needed. Products Copyright 2026, Coilcraft, Inc. Taiwan +886 2-2264 3646 We value your privacy We use essential and non-essential cookies on our Site, including third party advertising cookies to provide tailored ads. For more details or to manage your preferences, please see our Privacy Policy