Texas Instruments DP83TG721RRHARQ1

Overview

DP83TG721RRHARQ1 from Texas Instruments is an AEC-Q100 qualified automotive Ethernet PHY transceiver supporting IEEE 802.3bp 1000BASE-T1 over single twisted-pair cable, with hardware IEEE 1588v2/802.1AS time stamping (±15ns 1pps), OA TC10 sleep mode (<20μA), and integrated AVB audio clock generation (IEEE 1722 CRF decode, I2S/TDM8 SCLK/FSYNC/MCLK). It serves as the physical layer interface in zonal gateways and ADAS sensor clusters.

For engineers reviewing the DP83TG721RRHARQ1 datasheet, DP83TG721RRHARQ1 pinout, DP83TG721RRHARQ1 application, or DP83TG721RRHARQ1 equivalent, key selection criteria include RGMII-only MAC interface support, VQFN-36 package with exposed thermal pad, TC10-compliant wake-forwarding capability, and integrated diagnostic tools including TDR-based cable fault detection and CQI for degradation monitoring.

Technical Context

The DP83TG721RRHARQ1 implements a fully integrated analog front end with LPF on MDI pins, fractional PLL for phase-synchronized wall clock synthesis (1kHz–50MHz), and dedicated hardware engines for 802.1AS timestamp capture, gPTP packet parsing, and IEEE 1722 CRF decode. Its TC10 sleep architecture supports local/remote wake-up and wake forwarding via EN and WAKE pins without external circuitry.

It delivers deterministic low-latency operation through hardware-accelerated time synchronization, enabling sub-15ns accuracy for LIDAR chirp alignment and GPS 1pps distribution. The device supports dual-voltage I/O (1.8V/2.5V/3.3V) and operates across –40°C to +125°C, meeting SAE J2962-3 and Open Alliance TC12 EMC requirements.

Key Specifications

Pinout & Package

VQFN-36 (RHA) package, 6.0 mm × 6.0 mm body size, 0.5 mm pitch, 1.0 mm max height, with exposed thermal pad requiring PCB soldering per SLUA271 guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive Ethernet PHY applications.

Compared with DP83TG721SRHARQ1, the DP83TG721RRHARQ1 trades SGMII flexibility for lower BOM cost and simplified layout in RGMII-only systems; compared with DP83TG720RRHARQ1, it delivers critical time-sensitive networking capabilities - including ±15ns 1pps, TC10 sleep, and AVB media clock synthesis - required for next-generation automotive E/E architectures.

Availability

DP83TG721RRHARQ1 is available at Aetrix Electronics and suitable for zonal gateway development, ADAS sensor integration, and telematics control units requiring stable component supply, automotive-grade reliability, and long-term lifecycle support.

Supply support for DP83TG721RRHARQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and automotive ICs, with decades of leadership in Ethernet PHY technology and functional safety certification.

The DP83TG721RRHARQ1 belongs to TI's automotive Ethernet PHY product line, designed specifically for time-sensitive networking in ISO 26262-compliant zonal architectures, ADAS sensor aggregation, and high-fidelity AVB audio transport.

FAQ

What is the primary MAC interface supported by the DP83TG721RRHARQ1?

The DP83TG721RRHARQ1 supports RGMII exclusively - it does not support SGMII. This is confirmed in the Device Comparison Table, which explicitly lists "Yes" for RGMII and "No" for SGMII under the DP83TG721R-Q1 row. Designers must use RGMII timing mode with appropriate board-level delay matching for reliable 1 Gbps operation.

Does the DP83TG721RRHARQ1 support Open Alliance TC10 sleep mode?

Yes, the DP83TG721RRHARQ1 is OA TC10 compliant with verified <20 μA sleep current. It supports local and remote wake-up, wake forwarding, and sleep negotiation per TC10 specification - all implemented in hardware without MCU firmware involvement. The EN and WAKE pins manage the full TC10 state machine.

What clock outputs does the DP83TG721RRHARQ1 provide for AVB audio applications?

The DP83TG721RRHARQ1 generates wall-clock-synchronized FSYNC, SCLK, and MCLK signals for I2S and TDM8 interfaces, all derived from its IEEE 1722 CRF-decoded media clock. These outputs span 1 kHz to 50 MHz and maintain phase coherence with the 802.1AS wall clock - eliminating need for external audio clock synthesizers in automotive AVB systems.

How does the DP83TG721RRHARQ1 achieve ±15ns time synchronization accuracy?

The DP83TG721RRHARQ1 achieves ±15ns 1pps accuracy through integrated hardware timestamping per IEEE 1588v2/802.1AS, combined with a fractional PLL that performs real-time phase correction of the wall clock. This closed-loop correction compensates for oscillator drift and jitter, enabling deterministic timing for LIDAR chirp alignment and GPS pulse distribution.

Is the DP83TG721RRHARQ1 pin-compatible with TI's 100BASE-T1 PHYs?

Yes, the DP83TG721RRHARQ1 is pin-compatible with TI's 100BASE-T1 PHYs and other 1000BASE-T1 PHYs in the same family, enabling single-board design scalability. However, BOM changes are required to support the higher-speed 1000BASE-T1 signal integrity requirements - including updated magnetics, layout tuning, and termination.