DP83TC811R-Q1 - 100BASE-T1 Automotive Ethernet PHY | TI
MPN: DP83TC811R-Q1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.24 | $324.00 |
| 500 | $2.86 | $1,430.00 |
| 1,000 | $2.49 | $2,490.00 |
DP83TC811R-Q1 Overview
An Ethernet PHY (physical layer transceiver) is the circuit block that converts digital MAC frames into analog signals suitable for the physical cable medium. In the network stack hierarchy - MAC controller, PHY transceiver, magnetics, and connector - the PHY performs the encoding, serialization, and line driving that bridge a microcontroller or SoC MAC to the twisted-pair cable. Automotive Ethernet PHYs such as this one implement the single-pair 100BASE-T1 standard (IEEE 802.3bw) specifically optimized for in-vehicle networks, replacing multiple pairs and heavier cabling with a single lightweight unshielded twisted pair.
Key features include IEEE 802.3bw compliance, support for MII, RMII, and RGMII MAC interfaces, operation over unshielded single twisted-pair cable, and automotive AEC-Q100-qualified construction under the TI Q1 automotive grade program. The low-power PHYTER architecture reduces total system power versus earlier automotive PHY generations, and integrated status LEDs plus an INH (inhibit) control pin simplify system-level power management and diagnostics.
From a technical standpoint, the device integrates the full analog front end - line driver, receiver, equalizer, and clock recovery - together with the digital 100BASE-T1 physical coding sublayer, requiring only a 25-MHz reference clock and minimal external components. The xMII flexibility lets one board design interface to MACs ranging from legacy MCU MII buses to high-speed RGMII-based SoCs without PCB redesign.
Typical applications include camera and sensor data links in ADAS systems, infotainment and display backbones, gateway modules, and body-domain controllers - anywhere a 100 Mbps in-vehicle network segment is required. The single twisted-pair interface materially reduces cable weight and cost in large vehicle harnesses.
A key design consideration is matching the MII variant to the MAC interface speed: RGMII requires careful PCB length matching and reference-clock routing, while MII/RMII are more forgiving. Also verify the INH pin drive configuration early, as pull-up versus pull-down requirements affect the power-architecture design.
This page synthesizes distributor pricing, drop-in alternatives within the TI PHYTER family, and practical design notes not found in the manufacturer datasheet. Pricing references are as of 2026-10-19.
Drop-in alternatives for DP83TC811R-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 DP83TC811R-Q1 (same form factor and footprint) — differing in Package, Product Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DP83TC811-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
DP83TC812R-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
DP83TC813R-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
DP83TC814R-Q1
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →DP83TC811R-Q1 Specifications
| Product Type | 100BASE-T1 Automotive Ethernet PHY Transceiver |
| Standard Compliance | IEEE 802.3bw (100BASE-T1) |
| Data Rate | 100 Mbps |
| MAC Interface | MII, RMII, RGMII (xMII flexible) |
| Cable Medium | Unshielded single twisted pair |
| Reference Clock | 25 MHz |
| Package | 36-VQFN (6x6 mm) |
| Mounting Type | Surface Mount |
| Automotive Grade | AEC-Q100 qualified (TI Q1) |
| Number of Transceivers | 2/2 (full duplex) |
| Status Indication | LED support |
| Power Management Pin | INH (inhibit) output |
DP83TC811R-Q1 36-vqfn (6x6 mm) Pin Configuration Guide
Pin configuration for DP83TC811R-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 DP83TC811R-Q1.
Refer to the datasheet for full pin configuration.
Typical Applications
DP83TC811R-Q1 is suitable for 6 applications: ADAS Camera and Sensor Data Links, Automotive Gateway Modules, Infotainment and Display Backbones, Body Domain Controllers, Automotive Ethernet Conformance Test and Development Boards, Industrial and Off-Highway Vehicle Networks.
ADAS Camera and Sensor Data Links
The DP83TC811R-Q1's 100 Mbps 100BASE-T1 link over a single unshielded twisted pair is the standard transport for automotive camera modules feeding ADAS processors, because it cuts cable mass and connector count versus legacy LVDS or multi-pair solutions. Its AEC-Q100 (Q1) qualification and low-power PHYTER architecture meet the environmental and thermal budgets of sensor pods mounted near windshields or mirrors. The PHY sits between the camera-side SoC MAC (typically RMII or RGMII) and the vehicle harness, encoding uncompressed or compressed video streams at 100 Mbps. Designers should budget for the INH-based power sequencing so the camera node can enter partial-networking sleep states, and verify the 25-MHz crystal layout away from the camera clock tree to avoid spurious coupling into the video path.
Recommended
Automotive Gateway Modules
Gateways bridging CAN, LIN, FlexRay, and Ethernet domains use the DP83TC811R-Q1 as the 100BASE-T1 physical access layer. Its xMII flexibility (MII, RMII, RGMII) lets a single gateway PCB serve multiple MCU/SoC families without redesign, a significant benefit across vehicle platforms. IEEE 802.3bw compliance guarantees interoperability with other OEM-approved 100BASE-T1 nodes. The exposed-pad 36-VQFN (6x6 mm) fits the dense multi-channel gateway layout where dozens of transceivers share limited board area. Because gateways must support wake/sleep over Ethernet, the INH pin integration into the module's power tree is essential; TI's E2E forum provides explicit guidance on INH drive configuration. Verify each port's magnetics and common-mode choke selection against the datasheet reference design for EMC compliance in CISPR 25 testing.
Recommended
Infotainment and Display Backbones
In-vehicle infotainment head units and rear-seat displays use 100BASE-T1 links to distribute audio, video, and control data. The DP83TC811R-Q1 provides the physical layer for these links with 100 Mbps full-duplex throughput over one unshielded twisted pair, reducing harness cost in door, pillar, and overhead routing. Integrated LED status outputs give production-line and service technicians link-state indication without software polling. The low-power PHYTER design keeps the thermal load manageable in sealed display enclosures with passive cooling only. When routing RGMII between the display SoC and the PHY, keep traces length-matched and short; TI's application note on suggested schematic capture (referenced on the TI product page and E2E forum) provides a validated reference topology that simplifies design reuse across multiple display variants.
Recommended
Body Domain Controllers
Body-domain controllers consolidating lighting, door, seat, and access functions increasingly adopt Ethernet as a backbone, and the DP83TC811R-Q1 provides a cost-optimized 100BASE-T1 PHY for these nodes. Its AEC-Q100 (Q1) grade covers the under-dash and door-module temperature environments, and the single twisted-pair interface simplifies routing through narrow harness channels in door looms. The INH pin enables partial-networking wake schemes so body modules can sleep at microamp-level budgets and wake on Ethernet traffic, which is critical for always-on access features. Because body modules are cost-sensitive, the DP83TC811R-Q1's basic feature set (without the higher-diagnostics tiers of the DP83TC812R-Q1/813R-Q1) matches the required functionality at the lowest family price point. Follow the datasheet reference schematic for the magnetics-free capacitive-coupling option where permitted by the OEM.
Recommended
Automotive Ethernet Conformance Test and Development Boards
Test benches and development boards validating 100BASE-T1 compliance use the DP83TC811R-Q1 as a reference PHY because it is the widely deployed IEEE 802.3bw implementation in current vehicle platforms. The 36-VQFN (6x6 mm) footprint on a development carrier allows probing of MII/RMII/RGMII signals, the 25-MHz clock tree, and the MDI pair during EMC and protocol testing. The integrated LED outputs give immediate visual link-status feedback during bring-up, and the INH pin behavior can be characterized for power-sequencing verification. TI's compare-products tool and E2E forum threads (including schematic-review threads for the DP83TC811RWRNDTQ1 variant) provide community-validated reference schematics that accelerate board bring-up. Use the same-family members to test diagnostics coverage across the PHYTER portfolio on a single board.
Recommended
Industrial and Off-Highway Vehicle Networks
Beyond passenger cars, the DP83TC811R-Q1 serves construction, agricultural, and industrial mobile machinery adopting automotive Ethernet standards. Its AEC-Q100 (Q1) qualification exceeds typical industrial requirements, giving margin in high-vibration, wide-temperature off-highway environments. The 100 Mbps 100BASE-T1 single twisted-pair link is used for camera clusters (rear-view and surround-view mandated on many machine categories), telematics gateways, and controller-area interconnects. The xMII interface support lets designs share MCU platforms between road-vehicle and off-highway product lines, amortizing firmware investment. Because these machines often lack the strict EMC laboratories of OEM automotive programs, still design the MDI common-mode filtering per the datasheet reference design to pass generic industrial emissions limits; the low-power PHY helps in passively cooled sealed control boxes common in agricultural equipment.
Recommended
Recommended Products Summary
Engineering reference data for DP83TC811R-Q1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DP83TC811-Q1 | DP83TC812R-Q1 | DP83TC813R-Q1 | DP83TC814R-Q1 |
|---|---|---|---|---|---|
| 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 |
| Standard | IEEE 802.3bw (100BASE-T1) | IEEE 802.3bw (100BASE-T1) | IEEE 802.3bw (100BASE-T1) | IEEE 802.3bw (100BASE-T1) | IEEE 802.3bw (100BASE-T1) |
| Data Rate | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps |
| Automotive Qualification | AEC-Q100 (Q1) | AEC-Q100 (Q1) | AEC-Q100 (Q1) | AEC-Q100 (Q1) | AEC-Q100 (Q1) |
| Positioning per TI Compare Tool | Base 100BASE-T1 automotive PHY | Drop-in with upgraded functionality (adds SGMII) | Drop-in with upgraded functionality | Drop-in with upgraded functionality | Drop-in with upgraded functionality |
Key Differentiators
- Lowest-cost entry into the TI 100BASE-T1 automotive PHY family (vs DP83TC812R-Q1)
- Three MAC interface options covering common MCUs (vs DP83TC811-Q1)
- Proven TI E2E support base (vs NXP TJA1101AHN)
Design Notes
Clarify the INH pin configuration early in schematic capture. TI's E2E forum thread 'output drive stage of INH pin' addresses whether pull-up or pull-down resistors are required; assuming a default topology can cause the downstream power rail to remain disabled or fail to sleep. Consult the datasheet INH section and that E2E thread, and simulate the sleep/wake sequence with the actual resistor values before releasing the schematic.
When using the RGMII interface, match clock-to-data trace lengths within the datasheet skew budget and keep the RGMII bus under the maximum recommended length. RGMII at 125 MHz double-data-rate is the least forgiving of the three xMII options; if the layout is tight, prefer RMII, which uses a fixed 50 MHz reference and single-data-rate signaling. Follow the suggested schematic capture in TI's application note referenced on the product page.
The PHY requires a 25-MHz reference per the datasheet block diagram. Use an automotive-grade crystal meeting the datasheet frequency-tolerance spec, because 100BASE-T1 transmit compliance depends directly on clock accuracy. Place the crystal close to the XI/XO pins with short guard rings, and keep it away from the MDI pair and camera/display clock trees to prevent spurious coupling into compliance tests such as CISPR 25 emissions.
The 36-VQFN (6x6 mm) exposed pad is the primary thermal and ground return path. Solder the pad to a solid ground plane with an array of thermal vias per the datasheet layout guidelines. Before reusing an existing DP83TC811R-Q1 footprint for a family member, verify the exact package drawing in each datasheet - TI's E2E forum contains a thread noting package-description ambiguity for DP83TC811RWRNDRQ1 - and confirm with the latest revision.
Compliance Information
The -Q1 suffix designates AEC-Q100 automotive qualification per TI product page. RoHS/REACH/lead-free status not stated in provided data - verify on TI product page.
