TJF1103 Ethernet 100BASE-T1 PHY Transceiver

Introduction

NXP Semiconductors’ TJF1103 is an industrial 100BASE-T1 Ethernet PHY transceiver line for 100 Mbit/s communication over a single unshielded twisted-pair cable. The line is aimed at industrial applications and commercial vehicles, combining short-reach single-pair Ethernet connectivity with time-stamping support compliant with IEEE 1588v2 and IEEE 802.1AS-2020.

The TJF1103 is technically notable for offering alternative MAC-side interface options across the line: TJF1103A supports MII/RMII and RGMII(-ID), while TJF1103B uses SGMII.

What it does

The TJF1103 implements IEEE 802.3bw-compliant 100BASE-T1 Ethernet physical-layer connectivity. It supports both transmit and receive operation at 100 Mbit/s over unshielded twisted-pair cable lengths of up to 15 m.

As an Ethernet PHY, the device provides the physical interface between an Ethernet MAC and the single-pair cable link. The available MAC interface depends on the selected variant:

• TJF1103A: MII/RMII and RGMII(-ID)
• TJF1103B: SGMII

The transceiver also supports time-stamping compliant with IEEE 1588v2 and IEEE 802.1AS-2020, making it relevant where Ethernet communications must be associated with a common timing reference. The devices operate from a single supply and are specified for temperatures from -40°C to +105°C. Functional safety is identified as QM-compliant.

Applications

Potential uses that follow directly from the device’s interface and link capabilities include:

• Industrial automation equipment using 100BASE-T1 single-pair Ethernet links
• Commercial-vehicle electronic systems requiring 100 Mbit/s Ethernet communication
• Short-reach Ethernet connections over unshielded twisted-pair cable
• Networked equipment that requires IEEE 1588v2 or IEEE 802.1AS-2020-compliant time-stamping
• Designs needing a PHY with MII/RMII, RGMII(-ID), or SGMII MAC connectivity, depending on variant

Design considerations

The TJF1103 supports up to 15 m of unshielded twisted-pair cabling, so cable length and media selection should be considered during link planning. Designers should also select the appropriate variant according to the host MAC interface: TJF1103A for MII/RMII or RGMII(-ID), or TJF1103B for SGMII.

The device is supplied in a 36-pin, 6 mm × 6 mm HVQFN package with an exposed thermal pad and wettable flanks. PCB footprint, thermal-pad implementation, and assembly inspection requirements should therefore be addressed in the board design. Its -40°C to +105°C operating range is relevant for industrial and vehicle-oriented environments.

Availability and further information

The source/distributor and datasheet links on this page provide further information on the TJF1103 Ethernet 100BASE-T1 PHY transceiver line, including variant-specific details and integration guidance.