NVIDIA/Mellanox QDD-ER8-400G Compatible 400G QSFP-DD ER8 Transceiver Module
The QDD-ER8-400G compatible module serves equipment requiring a 400G QSFP-DD interface with 1310nm optics and a 40km rating. Connection is through Duplex LC (UPC). Product data, application guidance and factory verification are presented together to support project teams keep OEM references, delivery records and port schedules aligned.
OEM Part Number: QDD-ER8-400GHT Part Number: QDD-ER8-400G
Product Highlights
- Compatible alternative to NVIDIA/Mellanox QDD-ER8-400G
- 400G connectivity at 425Gbps
- Optical wavelength: 1310nm
- Specified reach: 40km
- Duplex LC (UPC) / SMF interface
- Digital diagnostic monitoring: Supported
- Operating temperature: 0 to 70°C (32 to 158°F)
Specifications
| HT Part Number | QDD-ER8-400G |
|---|---|
| Manufacturer | HT |
| Form Factor | QSFP-DD |
| Max Data Rate | 425Gbps |
| Wavelength | 1310nm |
| Max. Cable Distance | 40km |
| Connector | Duplex LC (UPC) |
| Media | SMF |
| Transmitter Type | LWDM EML |
| Receiver Type | APD |
| TX Power | -0.6~5.6dBm |
| RX Power | -16.1~-3.4dBm |
| Power Budget | 15.5dB |
| Modulation | 8x 50G PAM4 |
| Max. Power Consumption | 14W |
| Extinction Ratio | 6dB |
| DDM/DOM | Supported |
| Commercial Temperature Range | 0 to 70°C (32 to 158°F) |
| DSP | TX and RX |
| Inbuilt FEC | No |
| Core Size | G.652/9um |
| Packaging Technology | BOX |
| Protocols | IEEE 802.3cn, QSFP-DD MSA, CMIS 4.0 |
Project Documentation and Traceability
Large deployments are easier to audit when the order code, optical standard and endpoint record agree. Keep the OEM reference in the compatibility document and the HT part number on the packing list. Labels and carton groups can be arranged by rack or port plan so installers need not identify modules by appearance. For this model, the principal parameters are data rate 425Gbps, wavelength 1310nm, rated reach 40km.
NVIDIA/Mellanox Compatibility and Factory Testing
Factory verification starts with the expected QDD-ER8-400G identity and finishes with an operating host link. EEPROM data, diagnostic visibility and the stated optical parameters are assessed together. Equipment model, hardware revision and software release can be reviewed before dispatch where platform behavior is uncertain.
Applications and Optical Link Design
Use this module for equipment interconnection over the specified single-mode fiber plant, including enterprise backbone, campus, metro or data-center interconnect links according to its rated distance. Confirm that both ends use the same optical standard and wavelength plan, and allow for connector, splice and patch-panel loss within the stated power budget.
Before deployment, check the host port type, supported data rate and firmware requirements. The 400G interface configuration must match the remote equipment; sharing a QSFP-DD housing alone does not make two transceiver types interoperable.
Before commissioning, measure the complete single-mode channel against the stated budget for 40km. Inspect every Duplex LC (UPC) connection and record diagnostic power where supported. Both ends must agree on rate, wavelength and optical standard.
Optical Acceptance, Diagnostics and Handling
For this model, the specified transmit-power range is -0.6~5.6dBm; the stated optical power budget is 15.5dB. During commissioning, record the host diagnostic readings after the link has stabilized and compare them with those limits. DOM values are useful operational indicators, but they do not replace calibrated optical measurements when a link is marginal. Investigate unexpected loss through connector inspection, cleaning and a channel measurement before replacing the module. Diagnostic monitoring is listed as Supported. Before every insertion, keep dust caps in place until the patch lead is ready, avoid touching the optical end face and use an appropriate inspection and cleaning procedure. Do not look into an active optical interface.
Frequently Asked Questions
Is this an original NVIDIA/Mellanox transceiver?
No. It is an HT-manufactured compatible alternative for equipment that specifies QDD-ER8-400G, not an original NVIDIA/Mellanox-branded module.
Which fiber and connector are required?
Use Duplex LC (UPC) with SMF. The specified maximum reach is 40km, subject to fiber quality and total link loss.
Can it be mixed with another wavelength or reach version?
Only when the two ends share the same optical standard, wavelength plan and supported data rate. Check the exact part numbers and link budget rather than relying only on the module form factor.
Ordering Information
When ordering, specify QDD-ER8-400G, QDD-ER8-400G, quantity and intended host platform. Project labels can repeat these details for receiving and asset records. Neutral labels, customer packaging and project-specific compatibility review are available on request.
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
Before packing, the module receives interface inspection, identification and link checks. Protective packaging avoids pressure on the connector and latch. Customer references, rack groups and project packing lists can be added for volume orders.
