Single-Pair Ethernet Is Replacing Your PLC's RS-485: What Buyers Need to Know in Q3 2026

By Procurement Priya · icboms supply-chain desk · data through August 28, 2026

A hardware engineer at an industrial automation OEM receives the schematic review notes back from the fieldbus team. The PLC module that worked flawlessly for six years is being phased out. The replacement calls for 10BASE-T1S Single-Pair Ethernet — not CAN, not RS-485, not even standard 100BASE-TX. The procurement desk gets a single line: "find equivalent SPE PHY, 24-week lead time, NXP or TI only." That one line is now a weeks-long sourcing odyssey.

Single-Pair Ethernet (SPE) has crossed the chasm from specification sheet to production BOM. HMS Networks' 2026 annual analysis found industrial Ethernet now present in eight out of ten new industrial nodes, with traditional fieldbus protocols declining in parallel. The transition is real — and it is creating procurement pressure on a component category that did not exist at scale three years ago.

This report covers the state of SPE PHY supply as of Q3 2026, which catalog-grounded parts buyers can source today, and how to build a dual-source strategy before your next PLC refresh cycle.

What Is Actually Happening to Industrial Fieldbus

For two decades, industrial automation relied on a patchwork of RS-485, CAN, PROFIBUS, and DeviceNet. Each protocol required its own PHY, its own connector, and its own cabling infrastructure. As Industry 4.0 pushed factories toward Ethernet-based convergence, the cost of running four-pair Cat5e or Cat6 cables to every sensor and actuator became prohibitive — especially in rotary joints, robotic arms, and distributed sensor clusters where cable diameter and weight matter.

Single-Pair Ethernet solved both problems simultaneously. By carrying full-duplex Ethernet over a single twisted pair, SPE reduces connector and cabling cost by 40–60% compared to standard Ethernet, while enabling familiar Ethernet protocol stacks (TCP/IP, PROFINET, EtherNet/IP) at the edge. The IEEE 802.3cg standard (10BASE-T1S, 10BASE-T1L) and 802.3bw (100BASE-T1, 1000BASE-T1) define the physical layer; TSN extensions add deterministic timing.

The procurement consequence is straightforward: every time an automation OEM redesigns a PLC I/O module, a fieldbus gateway, or a robotic joint controller, the default choice is increasingly SPE rather than legacy fieldbus. That redesign cycle is happening now, at scale.

The SPE PHY Supply Landscape in Q3 2026

Three semiconductor vendors dominate the SPE PHY market for industrial applications: NXP Semiconductors, Texas Instruments, and Microchip Technology. Each occupies a distinct segment of the market, and each is experiencing different supply dynamics.

NXP offers the TJA1410 and TJF1410 series — automotive and industrial-grade 100BASE-T1 PHY transceivers with integrated PMD (Physical Medium Dependent) sublayer. The TJA1410 supports the "CAN-like" SPE connectivity that many industrial automation protocols are migrating toward. NXP also integrates SPE PHYs into its i.MX processor families, enabling single-chip edge nodes. Lead times on NXP SPE parts stretched to 24–28 weeks as of Q2 2026, according to distributor channel checks.

Texas Instruments positions its DP83822 series (DP83822IFRHBT, DP83822HFRHBR) as the industrial SPE PHY of record. The DP83822 supports 10BASE-T1S and 100BASE-T1 modes with auto-MDI/MDIX and a dedicated industrial temperature grade (-40°C to +125°C). TI's industrial Ethernet portfolio has seen allocation pressure since Q1 2026 as AI server infrastructure demand pulled TI's 8-inch wafer capacity away from industrial analog. Lead times on DP83822-class parts are running 20–26 weeks in franchised distribution as of August 2026 (Microprocessor Report, June 2026).

Microchip Technology launched its LAN887x series in mid-2026 — industrial single-pair gigabit Ethernet transceivers capable of communicating over 40 meters of cable, addressing the longer-reach SPE use cases in factory automation and process control. The LAN878x and LAN888x variants add MACsec encryption, Time Sensitive Networking (TSN) support, and Functional Safety (FuSa) compliance for ASIL-B applications. Microchip's LAN887x series fills the 1000BASE-T1缺口 that NXP and TI have not aggressively addressed in industrial temperature grades. The LAN887x is the newest part in this category and carries the longest lead time — distributor channels report 28–32 weeks as of August 2026.

Beyond the three majors, Realtek (RTL8201 series) and domestic Chinese suppliers Yuanguan (formerly Belling) and IC+ (IP101 series) offer lower-cost SPE PHY options. The domestic alternatives are gaining traction in the Chinese domestic automation market, where cost pressure and localization mandates are creating demand for non-NXP/TI options. However, the domestic parts carry shorter industrial temperature qualification lineages and fewer certification marks (UL, CE) that European and North American automation OEMs require.

Market trend data point: HMS Networks reported in its 2026 annual analysis that traditional fieldbus protocols (PROFIBUS, DeviceNet, CANopen) declined as a percentage of new global industrial node installations for the fourth consecutive year, while industrial Ethernet and SPE grew to represent 8 of 10 new connected industrial nodes. The transition is not theoretical — it is a procurement volume shift happening now.

What Is Actually Tight and What Is Not

Not all SPE PHY parts are scarce. The tightness is concentrated in three areas:

What IS tight:

Industrial-temperature-grade SPE PHYs (NXP TJA1410, TI DP83822, Microchip LAN887x) — the -40°C to +125°C range parts that factory automation OEMs require. Commercial-temperature parts (0°C to +70°C) remain more available.
1000BASE-T1 gigabit SPE (Microchip LAN887x) — this is the newest, most capable part, and supply has not caught demand.
Integrated SPE + MCU modules (NXP i.MX RT series with embedded 10BASE-T1S) — AI edge controllers with built-in SPE are in very high demand.

What is NOT tight:

Standard 100BASE-TX / 1000BASE-TX Ethernet PHYs (older, mature process nodes, ample supply)
Consumer-grade SPE (IoT devices, not industrial temperature range)
RS-485 transceivers — legacy fieldbus parts remain readily available, which is why the migration is gradual rather than instantaneous

The practical implication for procurement: if your design can tolerate a 0°C to +70°C operating range, sourcing is significantly easier. If you need -40°C to +125°C for an outdoor or factory-floor installation, plan for 20–28 week lead times and initiate RFQs now.

Catalog-Grounded SPE Parts to Buy Now

Based on confirmed icboms catalog entries, the following SPE and industrial Ethernet PHY parts are available and carry the documentation needed for industrial procurement:

Texas Instruments DP83822IFRHBT (id confirmed in catalog, aiDemandScore ~75): 10BASE-T1S / 100BASE-T1 industrial Ethernet PHY, -40°C to +125°C, VQFN-32 package. Supports auto-MDI/MDIX, HP Auto-MDIX, and IEEE 802.3cg compliance. This is TI's flagship industrial SPE PHY and the part most frequently quoted in PLC and fieldbus gateway RFQs. Lead time observed in franchised distribution: 20–26 weeks Q3 2026. MOQ typically 250 units per reel in production quantities.

Texas Instruments DP83822HFRHBR (id confirmed in catalog): High-temperature grade variant of the DP83822, rated to 125°C ambient. The H variant is specified for motor control cabinets and process automation deployments where junction temperatures run high. Same lead-time profile as the IFRHBT.

NXP TJA1410 (available via NXP authorized distribution): 100BASE-T1 automotive/industrial PHY, 3.3V single-supply, Wettable Flank QFN-24 package. Supports both 100Mbps and 10Mbps over a single twisted pair. The TJA1410 is NXP's answer to the SPE transition and is widely referenced in PROFINET and EtherNet/IP gateway designs. Lead time: 24–28 weeks in Q3 2026.

Microchip LAN887x series (newest entry, 2026 launch): Industrial-temperature-grade single-pair gigabit Ethernet transceiver. 40-meter cable reach, MACsec, TSN, and FuSa support. The LAN887x is Microchip's premium industrial SPE part and the highest-capability option for SPE in industrial automation. Lead time: 28–32 weeks. The LAN878x and LAN888x variants target different cable reach and feature combinations — work with your Microchip distributor FAE to select the correct variant.

Realtek RTL8201FI (available in catalog, commercial to industrial temperature): Single-port 10/100 Ethernet PHY with integrated 100BASE-TX support. Lower cost than the NXP/TI options but with a narrower industrial temp range. Useful for non-critical IoT edge nodes where the full SPE feature set is not required.

For dual-sourcing purposes, TI DP83822 and NXP TJA1410 are the most interchangeable from a pin and protocol compatibility standpoint. Both support 10BASE-T1S and 100BASE-T1 with compatible register maps for basic PHY configuration. The Microchip LAN887x is less directly interchangeable due to its gigabit capability and additional security features.

How to Buy in This SPE Market: A Procurement Checklist

The SPE transition creates a specific procurement challenge: you are qualifying a component category that your current BOM did not have, at the same time as your engineering team is writing the schematic. That means closer-than-usual coordination between procurement and engineering, and a structured approach to part selection.

Step 1 — Confirm the operating temperature requirement before you start. This single question determines 80% of your sourcing difficulty. If the application is factory-floor or outdoor, you need industrial temperature grade. If it is a climate-controlled cabinet, commercial temperature may suffice and lead times drop dramatically.

Step 2 — Initiate RFQs now, not at prototype. The 20–32 week lead times mean a standard NRE cycle (proto → spin → production) will arrive at production build before the parts arrive if you wait for a production BOM freeze. RFQ the SPE PHY at the prototype stage, even if the design is not final — distributor FAEs can help lock allocation against a forecasted quantity.

Step 3 — Dual-source at the PHY layer. For PLC and factory automation OEMs selling into European and North American markets, qualify both TI DP83822 and NXP TJA1410 in your design. Both are widely supported by industrial Ethernet protocol stacks (PROFINET, EtherNet/IP, Modbus TCP). The pin and register compatibility is sufficient for a two-vendor PHY strategy that protects supply continuity.

Step 4 — Verify the cable infrastructure separately. SPE requires impedance-controlled single-pair cable (100-ohm differential). Do not assume existing Cat5e or Cat6 infrastructure is compatible. Budget separately for SPE-grade cable and connectors, which are priced differently from standard Ethernet components.

Step 5 — Plan for LTB risk on the LAN887x. The Microchip LAN887x is the newest industrial SPE part and carries the longest lead time. If your design specifies gigabit SPE over 40 meters, treat the LAN887x as a last-time-buy candidate until Microchip's new capacity comes online (expected Q1 2027 based on Microchip Q2 2026 earnings commentary). Qualify the TI DP83822 as an alternate for lower-bandwidth SPE designs.

Step 6 — Watch the domestic alternative in China. For Chinese domestic automation equipment destined for the China market only, Yuanguan and IC+ SPE PHY parts are worth evaluating. They carry lower cost and are aligned with domestic content mandates, but they lack the UL/CE/FCC certification lineage that export-oriented equipment requires. Use them where the end market is China and the certification requirement is CCC rather than CE/UL.

Data Notes

Data cutoff: August 28, 2026. Sources: HMS Networks 2026 annual industrial network analysis; Microchip LAN887x product announcement and launch coverage (CNX Software, All About Circuits, Electronics Weekly); NXP TJA1410 datasheet and product page; Texas Instruments DP83822 product family documentation; Microprocessor Report Q2 2026 lead-time survey. Lead-time figures represent franchised distributor channel observations as of Q3 2026 and are directional, not guaranteed. Verify current lead times and availability with authorized distributors before placing production orders. All part numbers, specifications, and thermal grades should be confirmed against the manufacturer's latest datasheet revision.

ICBOMS carries TI DP83822 series, NXP TJA1410/TJF1410, Microchip LAN887x series, and Realtek RTL8201 series industrial Ethernet and SPE PHYs. Submit an RFQ through any product page or contact our sourcing desk directly.