DP83TG721R-Q1 - 1000BASE-T1 Automotive Ethernet PHY | TI
MPN: DP83TG721R-Q1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.87 | $88.70 |
| 100 | $7.88 | $788.00 |
| 500 | $7.1 | $3,550.00 |
| 1,000 | $6.4 | $6,400.00 |
DP83TG721R-Q1 Overview
An Ethernet PHY (physical layer transceiver) is the IC that converts the digital MAC-layer frames of a network processor or microcontroller into analog signals suitable for transmission over copper cable. In a vehicle network hierarchy, the PHY sits between the Ethernet switch/MAC and the single twisted-pair (SPE) wiring harness, making it the foundation block of automotive in-vehicle networking (IVN) architectures such as domain/zonal E/E topologies.
Key features of the DP83TG721R-Q1 include IEEE 802.3bp and Open Alliance compliance, full 1000BASE-T1 operation over a single twisted pair, TC-10 sleep/wake power management, IEEE 802.1AS time synchronization, and advanced Time-Sensitive Networking (TSN) and Audio Video Bridging (AVB) capabilities. The device can also generate FSYNC/SCLK wall-clock-synchronized outputs for I2S/TDM8 audio interfaces, a differentiating feature for in-vehicle audio networks.
The transceiver provides all physical layer functions required to transmit and receive data over single twisted-pair cable, and is electrically compatible with TI's 100BASE-T1 and 1000BASE-T1 PHY families, enabling design scalability: one PCB footprint can serve both 100 Mbps and 1 Gbps links. This multi-speed compatibility reduces harness and board re-qualification effort across vehicle platforms.
Typical applications include ADAS camera and sensor links, zonal gateway ECUs, infotainment and audio networks, and in-vehicle robotics platforms requiring deterministic gigabit connectivity. The AEC-Q100-oriented automotive qualification and Open Alliance conformance target harsh automotive EMC environments.
A key design consideration: the publicly available short-form datasheet does not include the complete pinout and application circuit, as confirmed on the TI E2E forum; engineers should plan schematic capture around TI's NDA documentation. Note also that some pins on the related DP83TG720 are NC, so pin functions must be re-verified when reusing layouts.
This page synthesizes verified distributor data, drop-in alternatives, migration guidance from TI E2E forum threads, and practical design notes not found in the manufacturer's short-form datasheet.
Drop-in alternatives for DP83TG721R-Q1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with DP83TG721R-Q1 (same form factor and footprint) — differing in Data Rate, Product Type, Standards Compliance, Package, Marking Code.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DP83TG721SRHARQ1
✅ Drop-In📋 Reference alternative (not in catalog)
DP83TG721RRHARQ1
✅ Drop-In📋 Reference alternative (not in catalog)
DP83TG720RWRHATQ1
✅ Drop-In✓ In Stock
$6.2 / Unit
View Datasheet →DP83TC816RHARQ1
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →DP83TC817S-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
DP83TG721R-Q1 Specifications
| Product Type | Automotive 1000BASE-T1 Ethernet PHY transceiver |
| Data Rate | 1000 Mbps (1000BASE-T1) |
| Standards Compliance | IEEE 802.3bp, Open Alliance |
| Media | Single unshielded/shielded twisted-pair (UTP/STP) |
| TSN/AVB Support | Advanced TSN and AVB features |
| Time Sync | IEEE 802.1AS |
| Power Management | TC-10 sleep/wake |
| Audio Interface | FSYNC/SCLK wall-clock synchronized output for I2S/TDM8 |
| Family Compatibility | Compatible with TI 100BASE-T1 and 1000BASE-T1 PHYs |
| Qualification | Automotive grade (AEC-Q100 family, Q1 designation) |
| Package | 36-VQFN (6x6 mm) |
| Mounting Type | Surface Mount |
| Datasheet Length | 12 pages (short-form datasheet) |
DP83TG721R-Q1 36-vqfn (6x6 mm) Pin Configuration Guide
Pin configuration for DP83TG721R-Q1 (36-vqfn (6x6 mm) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for DP83TG721R-Q1.
Refer to the datasheet for full pin configuration.
Typical Applications
DP83TG721R-Q1 is suitable for 6 applications: ADAS Camera Module Interface, Zonal Gateway and Domain Controller ECUs, In-Vehicle Audio Networking (AVB), Autonomous Mobile Robots and AGVs, Sensor Fusion and Time-Critical Data Acquisition Nodes, Infotainment and Display Backbone.
ADAS Camera Module Interface
The DP83TG721R-Q1 fits ADAS camera links because its 1 Gbps single twisted-pair 1000BASE-T1 link provides the bandwidth required by high-resolution image sensors, and DigiKey explicitly categorizes the DP83TG721SRHARQ1 sibling as a camera Ethernet interface device. Its IEEE 802.1AS time synchronization lets image frames be timestamped against the vehicle network grandmaster clock, which is essential for sensor-fusion algorithms correlating camera, radar, and lidar data. In the circuit, the PHY connects the camera SoC MAC through its digital interface to a single unshielded or shielded twisted pair running back to the domain controller, with TC-10 enabling the camera node to enter low-power sleep on the vehicle's wake/sleep bus. Because the link meets Open Alliance automotive EMC conformance, it survives the harsh radiated-emissions and immunity environment of the harness without expensive shielded cabling in many installations.
Recommended
Zonal Gateway and Domain Controller ECUs
The DP83TG721R-Q1 is well suited to zonal gateway ECUs because it provides a 1 Gbps uplink with advanced TSN features (per IEEE 802.1AS and AVB profiles) that deliver deterministic latency and bounded jitter for aggregated sensor and actuator traffic. TI's family compatibility statement - DP83TG721-Q1 is compatible with TI's 100BASE-T1 and 1000BASE-T1 PHYs - means a single zonal ECU board can be re-populated with 100 Mbps or 1 Gbps PHYs to serve different vehicle trim levels without a new PCB. The PHY's TC-10 sleep/wake support lets the gateway participate in vehicle-wide power management, dropping to low quiescent states during parking while remaining wake-capable on the network. In the ECU, the PHY bridges the central Ethernet switch to the single twisted-pair harness legs feeding downstream zonal nodes, and Open Alliance compliance guarantees interoperability with other OEM-approved PHY vendors on the same link.
Recommended
In-Vehicle Audio Networking (AVB)
The DP83TG721R-Q1 directly targets automotive audio networks because, per TI, it can generate FSYNC/SCLK wall-clock-synchronized clocks for I2S/TDM8 interfaces needed in audio applications. This means an AVB-enabled audio amplifier or head unit can derive its audio sample clock from the network's IEEE 802.1AS grandmaster time instead of a local oscillator, eliminating sampling-rate drift between endpoints and enabling synchronized multi-channel playback across the cabin. The PHY's advanced AVB feature set implements the stream reservation and traffic-shaping behaviors that guarantee bandwidth for audio streams on a converged Ethernet backbone that also carries camera and control traffic. In practice, the PHY sits between the audio DSP's I2S/TDM8 ports and the single twisted-pair speaker-network cable, delivering 1 Gbps capacity that comfortably carries dozens of uncompressed audio channels with headroom for future growth.
Recommended
Autonomous Mobile Robots and AGVs
Autonomous mobile robots and automated guided vehicles fit the DP83TG721R-Q1 because TI showcased the part in a robotics context (Electronic Specifier, December 2024), and industrial robots share the same networking needs as vehicles: gigabit bandwidth over light single-pair cable, deterministic TSN latency for motion control, and IEEE 802.1AS time sync for multi-sensor fusion. The single twisted-pair interface reduces the robot's slip-ring and drag-chain cabling weight compared to four-pair industrial Ethernet, and TC-10 power management supports energy budgets during idle periods of the duty cycle. On the robot controller board, the PHY links the main compute module to cameras and lidar head over 1000BASE-T1, while Open Alliance EMC robustness ensures reliable communication near motor drives and switching power electronics. The 36-VQFN 6x6 package fits compact joint controllers where board area is constrained.
Recommended
Sensor Fusion and Time-Critical Data Acquisition Nodes
The DP83TG721R-Q1 fits sensor-fusion acquisition nodes because its IEEE 802.1AS gPTP support aligns all node clocks to nanosecond-scale accuracy, letting lidar, radar, and IMU samples be correlated precisely at the fusion processor. Its 1 Gbps single-pair link provides enough bandwidth to stream raw or lightly compressed sensor data to a central ECU without local buffering, and the advanced TSN feature set provides the scheduled-traffic classes that keep high-priority sensor streams immune to congestion from background diagnostics on the same backbone. Designers place the PHY between the acquisition MCU/SoC and the vehicle's Ethernet ring, with TC-10 sleep allowing the node to drop power between acquisition windows. Because the part is automotive Q1 graded and Open Alliance compliant, the same node design transfers directly from industrial prototypes to production vehicle programs without re-qualification of the physical layer.
Recommended
Infotainment and Display Backbone
The DP83TG721R-Q1 suits infotainment backbones because 1 Gbps over a single twisted pair carries compressed video streams to rear-seat displays and head units, while its AVB feature set reserves bandwidth so that navigation map updates or file transfers never stall a streaming video session. The I2S/TDM8 wall-clock FSYNC/SCLK generation ties the infotainment audio path to the same network time base as the amplifier, simplifying clock distribution across the cabin and removing dedicated audio-return cabling. With TI family compatibility across 100BASE-T1 and 1000BASE-T1 PHYs, one display-module PCB can serve entry vehicles on 100 Mbps links and premium variants on 1 Gbps links, cutting harness variants and development cost. The PHY's Open Alliance EMC compliance allows operation over unshielded single-pair cable routed alongside noisy vehicle harnesses, and TC-10 supports the rapid display wake behavior demanded at vehicle power-up.
Recommended
Recommended Products Summary
Engineering reference data for DP83TG721R-Q1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DP83TG721SRHARQ1 | DP83TG721RRHARQ1 | DP83TG720RWRHATQ1 | DP83TC816RHARQ1 |
|---|---|---|---|---|---|
| Package | 36-VQFN (6x6 mm) | 36-VQFN (6x6 mm) - same | 36-VQFN (6x6 mm) - same | 36-VQFN (6x6 mm) - same | 36-VQFN (6x6 mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Link Speed | 1000 Mbps (1000BASE-T1) | 1000 Mbps | 1000 Mbps | 1000 Mbps | 100 Mbps (100BASE-T1) |
| Standards | IEEE 802.3bp, Open Alliance | IEEE 802.3bp, Open Alliance | IEEE 802.3bp, Open Alliance | IEEE 802.3 (per DigiKey listing) | IEEE 802.3bw (100BASE-T1 family) |
| Primary Use Case | 1 Gbps TSN/AVB nodes (camera, audio, gateway) | Camera Ethernet interface (per DigiKey) | Same as this product | Cost-optimized basic gigabit links | 100 Mbps migration designs |
Key Differentiators
- Advanced TSN and AVB feature set (vs DP83TG720RWRHATQ1)
- Gigabit throughput with 100 Mbps family scalability (vs DP83TC816RHARQ1)
- Automotive-grade Q1 qualification with Open Alliance compliance (vs Generic industrial Ethernet PHYs)
Design Notes
Do not copy the DP83TG720R-Q1 schematic onto a DP83TG721R-Q1 board without re-verification: TI E2E forum threads confirm certain pins that are active on the DP83TG721 are NC on the DP83TG720, and the public 12-page short-form datasheet omits the full pinout and application circuit. Obtain TI's complete design documentation (full datasheet under NDA) before schematic capture, and run TI's schematic review as was requested by engineers migrating between the 721 and TC816 families.
For 1 Gbps single twisted-pair operation, treat the MDI pair as a 100-ohm differential routed pair: keep the two MDI traces length-matched, reference a continuous ground plane, and place the network magnetics/termination network close to the PHY pins per the manufacturer application circuit. The 36-VQFN (6x6 mm) has a center thermal pad that must be soldered to a via-stitched ground pour for both heat dissipation and a low-impedance return path; stub out all digital interface traces with controlled impedance and avoid routing them under the MDI pair to prevent crosstalk.
Automotive PHYs must survive load-dump and cold-crank conditions: provide a local LDO or protection stage rated for the vehicle 12 V rail feeding the PHY supplies, with bulk and 100 nF decoupling at each supply pin placed within a few millimeters of the ball/VQFN pads. Estimated: total supply decoupling for a multi-rail PHY typically totals several tens of microfarads across rails, split as one 10 uF bulk per rail plus 0.1 uF per pin. Verify actual per-rail voltages and sequencing against TI's NDA design documentation, since the public short datasheet omits supply details.
1000BASE-T1 uses PAM3 modulation on a single pair, so radiated emissions from the MDI pair are the primary EMC risk in the 2-300 MHz band. Use the Open Alliance-recommended common-mode choke and termination network from TI's reference design, keep the pair routing short and symmetric, and place the cable connector's shield (if STP) directly on chassis ground rather than signal ground. Validate against the vehicle OEM's CISPR 25-class limits early, since PHY mode settings (test modes per 802.3bp) are used during EMC pre-compliance measurement.
Compliance Information
Q1 designation indicates TI automotive-grade product line; specific AEC-Q100 grade and RoHS/REACH details were not stated in the retrieved web data and should be confirmed from the TI product page quality folder.
