DP83TC814S-Q1 - 100BASE-T1 Auto Ethernet PHY SGMII | TI
MPN: DP83TC814S-Q1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.9 | $4.90 |
| 10 | $4.45 | $44.50 |
| 100 | $3.9 | $390.00 |
| 500 | $3.45 | $1,725.00 |
| 1,000 | $3.05 | $3,050.00 |
DP83TC814S-Q1 Overview
An Ethernet PHY (physical layer transceiver) is the interface IC that converts digital MAC frames into analog signals suitable for transmission over a twisted-pair cable. Within the network signal chain, the PHY sits between the media access controller (MAC) in a processor or switch and the physical medium, performing serialization, line coding, equalization, and echo cancellation. In the 100BASE-T1 standard (IEEE 802.3bw, also known as Automotive Ethernet or Open Alliance BroadR-Reach), a single unshielded twisted pair carries full-duplex 100 Mbps traffic over up to 15 meters.
Key features of the DP83TC814S-Q1 include Open Alliance and IEEE 802.3bw compliance with Level IV emissions passing achieved through an integrated line filter (LPF), SAE J2962-3 EMC compliance, and configurable MAC interface I/O voltages of 3.3 V, 2.5 V, and 1.8 V with an optional separate voltage rail for the MAC interface pins. It supports MII, RMII, RGMII, and SGMII MAC interfaces, giving designers flexibility across host processors.
The device integrates a pseudo-random binary sequence (PRBS) frame generator fully compatible with internal loopbacks, allowing transmit and receive testing without a MAC attached. This accelerates production-line testing and board bring-up. The S-variant uniquely adds SGMII high-speed serialization for processors that only expose SGMII ports.
Typical applications include ADAS camera and radar links, domain and zonal control units, infotainment networks, and gateway ECUs that aggregate multiple 100 Mbps automotive Ethernet branches.
Design consideration: because the PHY is AEC-Q100 qualified for automotive environments, verify the power tree supports the configurable I/O rails early; the separate MAC-rail option avoids level shifters.
This page synthesizes datasheet specifications, drop-in alternatives, and design guidance not found in the manufacturer datasheet.
Drop-in alternatives for DP83TC814S-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 DP83TC814S-Q1 (same form factor and footprint) — differing in Package, EMC Compliance, MAC Interfaces, Pin Compatibility, Product Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DP83TC814R-Q1
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →DP83TG720S-Q1
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →DP83TC814S-Q1 Specifications
| Network Standard | IEEE 802.3bw 100BASE-T1 (Open Alliance compliant) |
| Data Rate | 100 Mbps |
| MAC Interfaces | MII, RMII, RGMII, SGMII |
| TC10 Sleep/Wake | Not supported (S variant) |
| MAC Interface I/O Voltage | Configurable: 3.3 V, 2.5 V, 1.8 V |
| Separate MAC Rail | Optional separate rail (3.3 V, 2.5 V, 1.8 V) |
| EMC Compliance | SAE J2962-3 compliant |
| Emissions Performance | Passes Level IV emissions with integrated LPF |
| Test Features | PRBS frame generator compatible with internal loopbacks |
| Qualification | AEC-Q100 qualified |
| Package | 36-pin VQFN wettable flank, 6.00 mm x 6.00 mm |
| Mounting Type | Surface Mount |
| Pin Compatibility | Pin-to-pin compatible with DP83TG720 (1000BASE-T1) |
| Outline Compatibility | Outline compatible with DP83TC811 |
| Application Market | Automotive |
DP83TC814S-Q1 36-pin vqfn wettable flank, 6.00 mm x 6.00 mm Pin Configuration Guide
Pin configuration for DP83TC814S-Q1 (36-pin vqfn wettable flank, 6.00 mm x 6.00 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 DP83TC814S-Q1.
Refer to the datasheet for full pin configuration.
Typical Applications
DP83TC814S-Q1 is suitable for 6 applications: ADAS Camera and Sensor Links, Zonal and Domain Control Units, Automotive Ethernet Gateways, Infotainment and Display Connectivity, Telematics and TCU Modules, Test and Production Line Fixtures.
ADAS Camera and Sensor Links
The DP83TC814S-Q1 fits ADAS camera and radar connectivity because 100BASE-T1 carries full-duplex 100 Mbps over a single unshielded twisted pair up to vehicle-scale lengths, reducing harness weight and cost versus legacy LVDS cabling. Its Level IV emissions performance achieved with the integrated low-pass filter and SAE J2962-3 EMC compliance directly address the radiated-emissions limits that camera links near antennas must meet. The SGMII MAC interface connects directly to high-speed vision SoCs and switch silicon that expose SGMII ports, while the PRBS generator with internal loopback enables end-of-line sensor testing without a MAC in the path. Typical use places the PHY between an image-sensor bridge and a domain-controller switch port, with the wettable-flank VQFN package supporting AXI inspection on automotive assembly lines.
Recommended
Zonal and Domain Control Units
In zonal architecture, the DP83TC814S-Q1 serves as a compact 100 Mbps uplink from a zonal controller to the central gateway. Its four MAC interface options (MII, RMII, RGMII, SGMII) let one PHY design attach to virtually any host microcontroller or switch, and the configurable 3.3 V, 2.5 V, or 1.8 V I/O voltages with an optional separate MAC rail eliminate level shifters when the host runs at 1.8 V. AEC-Q100 qualification covers the under-hood and cabin temperature environments of zonal nodes, and the 6 mm x 6 mm 36-pin VQFN conserves board area in dense controller PCBs. Because it is pin-to-pin compatible with the DP83TG720 gigabit PHY, the same zonal PCB can be scaled to 1 Gbps uplinks without layout change.
Recommended
Automotive Ethernet Gateways
Gateway ECUs aggregating multiple in-vehicle network branches use the DP83TC814S-Q1 for each 100BASE-T1 port. The integrated low-pass filter that passes Level IV emissions removes the external common-mode filtering network per port, a meaningful BOM and area saving in an 8-port gateway. The PRBS generator with loopback enables per-port factory link validation during EOL test without MAC software involvement, shortening production test time. SGMII support on the S variant allows direct serialization into high-port-count switch fabrics, while MII/RGMII options serve smaller gateway designs. The optional separate MAC-interface rail lets a single gateway design mix 3.3 V legacy hosts and 1.8 V switch ports across different channels.
Recommended
Infotainment and Display Connectivity
Head units, displays, and audio amplifiers increasingly interconnect over automotive Ethernet, and the DP83TC814S-Q1 provides the 100 Mbps link for these branches. Its low-power operation suits always-on infotainment nodes that must meet vehicle standby budgets, and configurable I/O voltages interface cleanly with display SoCs running at 1.8 V. The SGMII interface of the S variant attaches to SoCs that expose only serialized media ports, while PRBS-based loopback testing verifies display links on the production line without a running MAC stack. AEC-Q100 qualification and wettable-flank packaging meet the inspection and reliability standards demanded of passenger-compartment electronics, and footprint compatibility with the DP83TG720 allows shared layouts across standard and high-bandwidth display variants.
Recommended
Telematics and TCU Modules
Telematics control units use 100BASE-T1 to distribute cellular backhaul data to in-vehicle ECUs, and the DP83TC814S-Q1 provides a robust, EMC-hardened PHY for this branch. The device's integrated filtering achieving Level IV emissions is valuable in TCUs mounted near the vehicle antenna module where radiated emissions limits are strictest. RMII and MII modes connect directly to telematics microcontrollers such as S9S12 and SPC5 family MCUs, while the configurable I/O rails adapt to 3.3 V or 1.8 V host banks. The PRBS loopback feature supports quick module-level verification during manufacturing, and AEC-Q100 qualification plus SAE J2962-3 compliance satisfy the qualification checklist for connected-vehicle electronics.
Recommended
Test and Production Line Fixtures
End-of-line and validation fixtures exploit the DP83TC814S-Q1 PRBS frame generator with internal loopbacks to verify Ethernet PHY function on boards under test without any MAC or protocol stack. A fixture loads register sequences over the MDI or management interface, commands PRBS transmission, and checks the returned pattern for bit errors - a deterministic pass/fail in seconds. The device's own AEC-Q100 qualified behavior means fixture results correlate with in-vehicle performance, and the same register-level approach validates the pin-compatible DP83TG720 on gigabit variants using identical tooling. Fixtures also use the SGMII port to inject traffic from standard lab testers into automotive links, bridging commercial test equipment and 100BASE-T1 hardware.
Recommended
Recommended Products Summary
Engineering reference data for DP83TC814S-Q1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DP83TC814R-Q1 | DP83TG720S-Q1 |
|---|---|---|---|
| Package | 36-pin VQFN wettable flank, 6.00 mm x 6.00 mm | 36-pin VQFN wettable flank - same | 36-pin VQFN wettable flank - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Network Standard | 100BASE-T1 (IEEE 802.3bw) | 100BASE-T1 (IEEE 802.3bw) | 1000BASE-T1 |
| Data Rate | 100 Mbps | 100 Mbps | 1000 Mbps |
| MAC Interfaces | MII, RMII, RGMII, SGMII | MII, RMII, RGMII (no SGMII) | SGMII |
| AEC-Q100 | Qualified | Qualified | Qualified |
Key Differentiators
- SGMII MAC interface for serialized host connectivity (vs DP83TC814R-Q1)
- Footprint-upgradeable to gigabit (vs DP83TG720S-Q1)
- Integrated emissions filtering (vs DP83TC814R-Q1)
Design Notes
The 36-pin VQFN wettable-flank package is chosen specifically to enable automated optical and AXI inspection of the side solder fillets on automotive assembly lines. During layout, follow TI's datasheet PCB layout guidelines for the 100BASE-T1 MDI pair: keep the differential pair impedance-controlled at 100 ohms, match trace lengths, and place the integrated-LPF network exactly as shown in the datasheet application schematic since Level IV emissions compliance depends on it. Route SGMII as 85-ohm differential pairs with minimal stubs.
The MAC interface I/O is configurable for 3.3 V, 2.5 V, or 1.8 V, and an optional separate rail can power the MAC interface pins independently of the main I/O. Plan the power tree before schematic capture: if the host MCU runs at 1.8 V and other board peripherals at 3.3 V, use the separate MAC rail to avoid level translators entirely. Verify per the datasheet electrical characteristics table (section 7.5) that each rail's sequencing and decoupling recommendations are met; the datasheet documents integrated MAC series termination of approximately 50 ohms on RX_D[3:0], RX_ER, RX_DV, and RX_CLK.
Two frequent mistakes with this family: first, assuming the DP83TC811 is drop-in compatible - it is only outline compatible per the TI datasheet, so substituting it on a DP83TC814 footprint will fail; second, selecting the R variant when the design depends on SGMII, since DP83TC814R-Q1 omits that interface. Also note that this S variant does not support TC10 sleep/wake-up; if power-saving wake demands exist, verify the requirement against the family options before committing.
Compliance Information
AEC-Q100 qualified per TI datasheet. SAE J2962-3 EMC compliant. Open Alliance and IEEE 802.3bw compliant. RoHS/REACH/lead-free status not stated in the verified data captured for this page - confirm on the TI product page.
