NVIDIA/Mellanox MMA4X00-NS400 Compatible 400G OSFP DR4 Transceiver Module

MMA4X00-NS400 is the NVIDIA/Mellanox Ethernet reference for this 400GBASE-DR4 module. The HT compatible version uses a single-port OSFP RHS/Flat Top housing, four 100G PAM4 lanes at 1310nm and an MPO-12/APC single-mode interface for transmission up to 500m.

OEM Part Number: MMA4X00-NS400HT Part Number: OSFP-DR4-400G-FL

Product Highlights

• NVIDIA/Mellanox MMA4X00-NS400 compatible identification
• 400G DR4 with 4x100G-PAM4 electrical and optical modulation
• Single-port OSFP RHS/Flat Top design
• 1310nm DFB transmission up to 500m
• MPO-12/APC single-mode interface
• Built-in TX and RX CDR with FEC support
• DOM monitoring and 0 to 70°C commercial operation

This module addresses 400G Ethernet links that require more reach than multimode SR4 optics while remaining within a 500m single-mode channel. It can be used in data-center switch-to-switch, switch-to-server and accelerator-network connections where the host specifies MMA4X00-NS400 and the cabling plant uses MPO-12/APC. Four parallel 1310nm optical lanes carry the 400G DR4 signal.

The electrical and optical modulation is 4x100G-PAM4, with built-in transmit and receive CDR. Host port configuration, FEC behavior and firmware support must match the remote equipment. The same OSFP housing is used by several optical standards, so selection should always include the OEM part number rather than only the module shape.

MMA4X00-NS400 is a 500m DR4 reference. MMS4X00-NS400 is a separate DR4L reference rated for 100m, while MMA4Z00-NS400 is an SR4 multimode product for short-reach applications. These part numbers are not alternate spellings of one module. Confirm whether the project requires DR4, DR4L or SR4 before ordering.

A 500m rating does not remove the need for link-budget control. The specified power budget is 3dB, so connector, splice and patch-panel losses must be included. Use single-mode MPO-12/APC cabling and do not mate APC connectors with UPC connectors; the different end-face geometry can cause high loss or physical damage.

The RHS/Flat Top format is intended for compatible single-port OSFP host cages and adapter-card thermal designs. It differs mechanically from IHS/Finned Top modules. Check the host cage and heat-sink arrangement before installation, maintain the equipment manufacturer's airflow requirements, and do not force a flat-top module into a cage intended for a different thermal format.

This mechanical check is as important as optical compatibility. A module may have the correct DR4 optics yet still be unsuitable for a host if the heat-sink format is wrong. Provide the switch, DGX system, ConnectX adapter or BlueField platform model when requesting confirmation.

The module is programmed for equipment that recognizes MMA4X00-NS400. Testing covers EEPROM identification, optical transmit and receive levels, link establishment and diagnostic monitoring. Host hardware and firmware revisions can affect third-party module acceptance, so customers should supply the exact platform and software release for a pre-order compatibility review.

During commissioning, verify the expected 400G interface and DOM readings on both ends. If no link is established, inspect APC connector cleanliness and polarity, confirm single-mode cabling, and check FEC and port settings before replacing hardware.

Quote OEM part number MMA4X00-NS400 and HT part number OSFP-DR4-400G-FL with the required quantity. Also state the NVIDIA/Mellanox host model and whether the cage requires RHS/Flat Top. Standard supply uses HT factory identification; neutral labeling, customer packaging and project-specific compatibility coding are available for discussion.

Is this an original NVIDIA/Mellanox transceiver? No. It is an HT-manufactured compatible alternative for equipment that specifies MMA4X00-NS400.

Is MMA4X00-NS400 the same as MMS4X00-NS400? No. This page covers 400G DR4 at 500m; MMS4X00-NS400 is the separate DR4L 100m reference.

Which fiber connector is required? Use MPO-12/APC single-mode cabling and verify polarity and total channel loss. The maximum stated reach is 500m.

Does the Flat Top housing fit every OSFP port? No. Confirm that the host supports the single-port RHS/Flat Top mechanical and thermal format.

Every module undergoes visual inspection, optical performance checks, compatibility verification and diagnostic testing before packing. Protective anti-static packaging or blister trays and outer cartons are used for transport. Custom labels and project packing lists can be arranged for volume orders.

Standard products normally ship within one to three working days. Courier, air freight and sea freight options are available worldwide, and goods can be shipped on the customer's courier account or to an appointed forwarder.