DP83869HMRGZT Copper to Fiber Ethernet Media Converter PHY

ElecSuppliers Part Number GuideSep 06, 2026

The DP83869HMRGZT is a high-immunity Gigabit Ethernet PHY from Texas Instruments designed for networking systems that need both copper and fiber connectivity. Unlike a conventional copper-only Ethernet PHY, the DP83869HM family supports 10BASE-Te, 100BASE-TX and 1000BASE-T copper Ethernet as well as 100BASE-FX and 1000BASE-X fiber interfaces.

This combination makes the DP83869HMRGZT suitable for industrial networking equipment where media conversion, flexible MAC interfaces and reliable operation across an extended temperature range are important.

Copper and Fiber Ethernet in One PHY

DP83869HMRGZT supports Ethernet speeds from 10Mbps to 1000Mbps on copper interfaces. For fiber applications, it supports both 100BASE-FX and 1000BASE-X.

The device can operate in media converter mode, allowing copper-to-fiber conversion without requiring a separate Ethernet switch. It supports 1000BASE-X to 1000BASE-T and 100BASE-FX to 100BASE-TX conversion, making it useful for extending Ethernet connections between different physical media.

This capability can simplify network architecture in industrial gateways, fiber uplinks and Ethernet equipment deployed in electrically noisy environments.

RGMII and SGMII Bridge Support

Another important feature of the DP83869HMRGZT is its flexible MAC-side connectivity. The device supports RGMII, SGMII and MII interfaces, allowing it to connect with different processors, switches and Ethernet controllers.

RGMII-to-SGMII and SGMII-to-RGMII bridge modes provide additional flexibility when integrating Ethernet equipment with different interface architectures. This is particularly useful when a system needs to connect an RGMII-based processor to an SGMII-based network interface.

The PHY also provides programmable RGMII termination impedance and integrated MDI termination, which can help reduce external component requirements and simplify high-speed PCB implementation.

Low Latency and Time-Sensitive Networking

DP83869HMRGZT is designed for applications where Ethernet latency and synchronization matter. The device supports Time Sensitive Networking and provides IEEE 1588 Start-of-Frame Detection functionality.

Its RGMII path offers total latency of up to 384ns for 1000BASE-T and up to 361ns for 100BASE-TX under the specified operating conditions. A recovered clock output is also available for SyncE applications, while selectable 25MHz and 125MHz synchronized clock outputs support different system architectures.

These capabilities make the PHY a strong candidate for industrial Ethernet equipment requiring predictable communication and improved network timing.

High-Immunity Ethernet for Industrial Systems

The DP83869HMRGZT is built for demanding environments and exceeds 8kV IEC 61000-4-2 direct-contact ESD requirements. It also includes cable diagnostics with TDR and BIST functions for Ethernet link testing and fault identification.

The device supports configurable I/O voltages of 1.8V, 2.5V and 3.3V, providing flexibility when interfacing with different MAC devices. Wake-on-LAN, jumbo frame support and fast link-drop functions add further networking capabilities.

The extended operating temperature range of -40°C to +125°C allows the DP83869HMRGZT to be considered for industrial equipment exposed to significant temperature variations.

DP83869HMRGZT in Industrial Ethernet Designs

With copper and fiber Ethernet support, integrated media conversion, RGMII-SGMII bridging, TSN capability and extended-temperature operation, the DP83869HMRGZT addresses applications that require more flexibility than a conventional Gigabit copper PHY.

It can be used in industrial Ethernet gateways, fiber media converters, automation equipment, network communication modules and embedded systems where copper-to-fiber connectivity and robust Ethernet performance are key design requirements.