SFP28 stands for Small Form-factor Pluggable 28. A hot-pluggable form factor using a 25G electrical lane, widely deployed for 25G Ethernet and server access. The term is most useful when a project connects that definition to a concrete use case such as 25G Ethernet, server access.
The reference framework matters when specifying SFP28 for 25G Ethernet, server access. The mechanical, electrical, thermal, and management requirements normally come from the relevant MSA and host-platform specification. A product name or quotation that mentions SFP28 without that context is not yet a complete requirement.
SFP28 should not be treated as another name for QSFP-DD. SFP28 is defined here as a hot-pluggable form factor using a 25G electrical lane, widely deployed for 25G Ethernet and server access. By comparison, QSFP-DD means an eight-lane high-density form factor supporting 400G and 800G while retaining backward compatibility with many QSFP modules. The two concepts may appear in the same design, but they answer different engineering or purchasing questions.
Before approving SFP28 for 25G Ethernet, server access, check cage type, electrical lane mapping, power class, cooling, firmware, and backward compatibility. The final decision should be based on the complete link or commercial requirement rather than a familiar label such as QSFP28.
Frequently Asked Questions
How is SFP28 different from QSFP-DD?
SFP28 refers to a hot-pluggable form factor using a 25G electrical lane, widely deployed for 25G Ethernet and server access. QSFP-DD instead refers to an eight-lane high-density form factor supporting 400G and 800G while retaining backward compatibility with many QSFP modules. They can be related in one project, but one does not prove compliance with the other.
Where is SFP28 normally used?
Typical use includes 25G Ethernet, server access. The exact implementation still depends on the host equipment, link design, environment, and governing specification.
What should a SFP28 specification include?
It should state cage type, electrical lane mapping, power class, cooling, firmware, and backward compatibility. These details allow a supplier or engineer to verify the requirement instead of relying only on the term SFP28.
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