NVIDIA/Mellanox QDD-400G-4Q4xNAC Compatible 400G QSFP-DD 8 x 50G PAM4 to 4 x 100G QSFP28 4 x 25G NRZ Ethernet Active Electrical Copper Breakout Cable
This NVIDIA/Mellanox QDD-400G-4Q4xNAC compatible cable series provides 400G connectivity through a direct-attach configuration. It is an active electrical assembly intended for hosts supporting the stated retimed interface. The page brings together the series specifications, compatibility guidance and direct links to the individual length and OEM part-number pages used for ordering.
Series Part Number: QDD-400G-4Q4xNACHT Part Number: QDD-400G-4Q4xNAC
Product Highlights
- HT-manufactured compatible alternative for NVIDIA/Mellanox QDD-400G-4Q4xNAC
- 400G aggregate connectivity at 400Gbps
- AEC
- Length configurations covered: 3m (10ft)
- Conductor specification: 30AWG
- Power consumption: ≤8.5W @QSFP-DD, ≤3.5W @QSFP28
- Operating temperature: 0 to 70°C (32 to 158°F)
Available Lengths and Corresponding Part Numbers
The documented series configuration is 3m (10ft). Use the relevant OEM reference below together with the HT identity and required length when requesting a quotation. If another length carries a different OEM part number, it must be reviewed and ordered as that distinct configuration.
Compatible OEM Part Numbers
- QDD-400G-4Q4xNAC03
Specifications
| HT Part Number | QDD-400G-4Q4xNAC |
|---|---|
| Manufacturer | HT |
| Connector Type | QSFP-DD to 4x QSFP28 |
| Max Data Rate | 400Gbps |
| Minimum Bend Radius | 26.5mm |
| Wire AWG | 30AWG |
| Cable Length Options Covered | 3m (10ft) |
| Jacket Material | PVC (OFNR) |
| Commercial Temperature Range | 0 to 70°C (32 to 158°F) |
| Power Consumption | ≤8.5W @QSFP-DD, ≤3.5W @QSFP28 |
Project Documentation and Cable Identification
Large deployments are easier to audit when the order code, physical length and endpoint record agree. Keep the OEM reference in the compatibility document and use the HT part number on the packing list. Where several lengths arrive together, labels and carton groups can be arranged by rack or port plan so installers do not have to identify cables by appearance alone. For this series, keep the interface rate, AEC construction and length-specific OEM reference together throughout that review.
NVIDIA/Mellanox Compatibility and Factory Testing
Factory verification links the compatibility identity to the exact physical assembly described on this page. Identification, connector condition and live link behavior are checked before packing. Customers can submit equipment and firmware details with the project documentation for a more specific pre-order compatibility review. Series-level inspection is followed by the exact length and OEM configuration selected for dispatch. Functional verification includes link establishment and diagnostic indications where the host exposes them.
Applications and Deployment
Active electrical cables use signal recovery or retiming to support demanding high-speed electrical links. Deployment should begin with host support for the exact AEC configuration, followed by checks of per-end power, cooling and breakout operation. The two ends and cable are engineered and tested as one assembly. For this series, the listed interface is the stated interface and the aggregate rate is 400G.
Cable Construction and Routing
For this assembly, the conductor specification is 30AWG; the jacket material is PVC (OFNR); the minimum bend radius is 26.5mm; the operating temperature is 0 to 70°C (32 to 158°F); the power consumption is ≤8.5W @QSFP-DD, ≤3.5W @QSFP28. These parameters belong in the installation review rather than being treated as catalogue trivia. Route the cable through its intended managers without tension, avoid pressure close to the connector boots and leave enough space to operate the latches. Any service loop must respect the stated bend limit.
Ordering Information
Use the listed HT part number for ordering and retain the OEM reference as the host-compatibility cross-reference. Send quantities by length, along with any rack-based packing or label instructions. If the project has mixed equipment, include the host model for each group rather than relying only on the aggregate cable rate. For this series, follow the corresponding length link, quote that exact OEM part number and keep different lengths on separate order lines. HT part number QDD-400G-4Q4xNAC identifies the product family; the linked page provides the final length-specific identity.
Shipping and Lead Time
Standard configurations normally ship within one to three working days, with production lead times confirmed for larger quantities. International courier, air freight and sea freight are available; customer courier accounts and nominated forwarders are accepted.
Quality Assurance and Packaging
Inspection and link testing are completed before the cable enters its protective packaging. Project orders can be packed and labelled by length, rack or customer reference, with packing documentation that makes received quantities straightforward to reconcile against the installation schedule. Both connector ends are inspected as part of the complete assembly, and protective packing is selected to avoid tight bends during transport and storage.
Frequently Asked Questions
Is this an original NVIDIA/Mellanox cable?
No. It is an HT-manufactured compatible cable for equipment that specifies QDD-400G-4Q4xNAC, not an original NVIDIA/Mellanox-branded product.
Are different lengths and OEM part numbers separate products?
Yes. Where a length has its own OEM reference, follow the corresponding link above and order that exact part number on its own line. Do not substitute another length only because the connector arrangement is the same.
Does this AEC cable require separate modules at each end?
No. The connector ends and cable form one complete direct-attach assembly. The ends are not detachable standalone transceivers, and the complete product is tested together.
What information helps confirm compatibility?
Provide the equipment manufacturer and model, port type, hardware revision and software release, together with the required OEM reference, length and quantity. Breakout projects should also identify the intended lane configuration.
