Mellanox MAM1Q00A-QSA28 QSFP28 SFP28 Adapter Horizontal Full Body Main View

Mellanox MAM1Q00A-QSA28 QSFP28 to SFP28 100G to 25G Adapter Converter Module

US$85.00
Mellanox

Product Features

Condition : Brand new,Genuine，never used，in stock.
Pure Passive Adapter : Passive QSFP28-to-SFP28 mechanical adapter with no integrated retiming IC, signal amplification, or DSP.
Single-Lane Electrical Mapping : Routes SFP28 lane 1 directly to QSFP28 channel 1; the remaining 3 QSFP28 channels are electrically terminated to maintain signal integrity and suppress crosstalk.
Broad Transceiver & Cable Compatibility : Compatible with standard MSA-compliant SFP28, SFP+, and SFP optical transceivers, Direct Attach Copper (DAC) cables, and Active Optical Cables (AOCs).
Industry-Standard Compliance : Fully compliant with SFF-8402 (SFP28 MSA), SFF-8665 (QSFP28 MSA), and SFF-8636 management interface specifications, supporting standard I²C management.
Transparent EEPROM & DOM Pass-Through : Host equipment accesses the SFP28/SFP+ module's internal EEPROM and DDM/DOM digital diagnostic telemetry directly via the transparent I²C path for real-time link monitoring.
Multi-Generation Rate Support : Supports 25GbE (SFP28) and 10GbE (SFP+) operations in a single adapter (1GbE SFP support is subject to host switch/NIC port hardware capabilities).
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Specifications

Genuine Mellanox MAM1Q00A-QSA28 QSFP28 to SFP28 100G to 25G Adapter Converter

The Mellanox MAM1Q00A-QSA28 is a QSA28 (QSFP28 to SFP28) passive mechanical adapter that enables a single-lane QSFP28 interface to connect to a single-port SFP28 or SFP+ transceiver / cable. Designed for high-density Ethernet switches and network interface cards (NICs), this passive adapter allows users to plug 25GbE (SFP28) or 10GbE (SFP+) optical transceivers, AOCs or Direct Attach Copper (DAC) cables into a 100GbE QSFP28 port without any hardware modification.

Mellanox Part Number
MAM1Q00A-QSA28
Band
  Mellanox
Revision
Rev:A6
Form Factor
  QSFP+ to SFP28 Adapter (QSA28)
Input Interface
  QSFP28
Output Interface
SFP28/SFP+
Supported Speed
Host: 100Gbps; Client: 25Gbs/10Gbps
Fiber Type
  SMF
Supported Rate
25GbE / 10GbE
Host Connector
QSFP28 Male (100G Port)
Media Connector
SFP28 / SFP+ Female Cage
Hot Swappable
  Support
Origin
China
Operating Temperature
0°C to +70°C (Commercial)

Typical Applications


✨Flexible Port Reuse on Mellanox ConnectX-4/5/6 100G NICs

Enables 100G QSFP28 ports on ConnectX Series SmartNICs to seamlessly interface with 25G SFP28 or 10G SFP+ transceivers and cables.

✨High-Density Port Splitting on NVIDIA/Mellanox SN Series Switches

Maximizes Spectrum switch port efficiency by converting high-density 100G QSFP28 ports into single-lane 25G/10G interfaces without requiring extra breakout patch panels.

✨Mixed-Speed Architecture in Cloud Data Centers

Bridges the gap between 100G Top-of-Rack (ToR) switches and legacy 25G/10G server nodes, enabling incremental 25G server expansion using standard 100G switch infrastructure.

✨Cost-Effective Expansion for HPC & AI Compute Clusters

Provides a low-cost, ultra-low latency (<0.1ns) interconnection method for adding 25G compute/storage nodes into 100G InfiniBand/Ethernet HPC environments without replacing expensive switch modules.

✨Legacy Infrastructure Modernization

Reclaims unused 100G QSFP28 ports on legacy core/aggregation switches for new 25G/10G service node rollouts, extending hardware lifecycle and reducing CAPEX.

Technical Note: When deploying MAM1Q00A-QSA28 on NVIDIA/Mellanox SN switches or ConnectX NICs, ensure the port speed is explicitly configured to 25G or 10G in the host OS (e.g., MLNX-OS/Onyx, Cumulus Linux, or Windows/Linux NIC drivers).