Amphenol Expands Liquid Cooling Connectors for AI, ESS & EV Systems

Amphenol Industrial Operations has expanded its Liquid Cooling Systems portfolio with new MQD, UQD/UQDB Rev 2.0 and SHQD connector families targeted at high‑density computing, energy storage systems and EV charging infrastructure.

The additions address different flow ranges and mechanical interfaces, allowing system designers to standardize on a coordinated set of liquid quick disconnects from tray level up to high‑flow sourceline connections.

Key features and benefits

• Broader coverage of cooling architecture from compact computer trays and blind‑mate server interfaces up to large‑diameter sourceline connections between coolant distribution units and manifolds.
• Quick disconnect operation across the family to support fast service, modularity and reduced downtime during maintenance or system upgrades.
• Dry‑break sealing concepts intended to minimize fluid loss and reduce the risk of spills when connecting or disconnecting under typical service conditions.
• Low flow resistance designs to help maintain coolant flow rates and reduce pumping losses in high‑density AI racks and power systems.
• Corrosion‑resistant materials, including stainless steel construction on selected series, for long‑term reliability with common water‑glycol coolants.
• Multiple termination options (threaded, hose barb, sanitary flange and others depending on series) to fit different hose and manifold concepts without additional adapters.
• QR code traceability on components to support asset tracking, configuration management and field service documentation.
• Compatibility with common coolants such as deionized water, ethylene glycol and propylene glycol according to the manufacturer’s datasheet, simplifying material qualification in existing platforms.

Typical applications

The expanded family targets modern liquid‑cooled power and computing platforms where air cooling alone is no longer sufficient.

• AI and high‑performance computing racks with direct‑to‑chip or cold‑plate cooling on trays and blades.
• Open Compute Project (OCP) aligned data center architectures requiring standardized quick disconnect interfaces at the rack or chassis level.
• Utility‑scale and commercial energy storage systems where dense battery and power conversion assemblies benefit from liquid cooling.
• High‑power DC fast EV charging equipment with liquid‑cooled cables, rectifier stages and power modules.
• Industrial and power conversion systems using coolant distribution units and manifolds for thermal management of inverters, converters and drives.

Where each series fits

SeriesMain role in systemTypical location in cooling loopMQDCompact quick disconnect for small‑diameter linesTray‑level and space‑constrained assemblies inside racksUQD / UQDBOCP‑aligned quick and blind‑mate interfacesRack/chassis interfaces, server and module docking pointsSHQDHigh‑flow sourceline connection with dry‑break safety featuresConnections between coolant distribution units and manifolds

Technical highlights

Although detailed numerical ratings should always be taken from the manufacturer’s datasheet, the main technical characteristics of the expanded Liquid Cooling Systems family can be summarized as follows.

MQD compact quick disconnect series

MQD is a small‑form‑factor liquid quick disconnect platform designed for tight spaces and modest flow requirements.

• Push‑pull locking mechanism for fast one‑handed operation in dense assemblies.
• Available in sizes 02, 03 and 04 to match smaller‑diameter liquid lines in tray‑level applications.
• Straight and right‑angle (90‑degree) connector versions to simplify routing within constrained rack geometries.
• Low flow resistance design suited to smaller circuits where pressure drop must be minimized to keep pump sizes reasonable.
• Corrosion‑resistant materials and seal compounds selected for compatibility with typical data center and power electronics coolants according to the manufacturer’s datasheet.
• QR code on the connector body for traceability and support of digital maintenance workflows.

UQD / UQDB Rev 2.0 for OCP‑aligned interfaces

The UQD/UQDB Rev 2.0 series is targeted at Open Compute Project based data center platforms and other systems adopting similar mechanical standards.

• UQD plug designed for quick plug‑in functionality in accessible interfaces.
• UQDB socket offering blind‑mate capability with self‑alignment features to tolerate typical rack tolerances and insertion paths.
• Rev 2.0 geometry aligned with updated OCP guidance, helping multi‑vendor interoperability where applicable.
• Standardized testing expectations defined in the revision to give system integrators clearer performance baselines.
• Improved flow performance compared with earlier versions, supporting higher heat loads per rack or chassis.
• Hybrid mating support that allows a UQD plug to mate with a UQDB socket, giving designers more flexibility when organizing manifold and chassis connections.

SHQD high‑flow sourceline series

SHQD addresses the high‑flow sections of the cooling loop where large volumes of coolant connect CDUs, manifolds and external loop components.

• Designed as a full‑flow connector with a bore optimized for minimal restriction in high‑capacity loops.
• Dual interlock safety features intended to help prevent accidental uncoupling and to reduce the risk of spills during service.
• Offered in nominal sizes around 1‑inch, 1.5‑inch and 2‑inch to cover a typical range of sourceline diameters in large systems.
• Rated flow performance up to 800 L/min according to the manufacturer’s datasheet, matching the needs of heavily loaded racks or multi‑rack manifolds.
• Multiple process connection options including thread, hose barb and sanitary flange versions to integrate directly with piping, hoses or stainless manifolds.

Family‑level characteristics

Across MQD, UQD/UQDB Rev 2.0 and SHQD, the Liquid Cooling Systems portfolio emphasizes:

• Dry‑break sealing concepts to limit fluid loss on disconnect and keep service areas cleaner.
• Low pressure drop across the connectors, which directly translates into lower pump power requirements or additional thermal headroom.
• Robust materials and seal selections with an eye toward galvanic compatibility and long service life in deionized water and glycol mixtures.
• QR code traceability as a standard feature on selected connectors, simplifying inventory control and field configuration checks.

Source

This article is based on an Amphenol Industrial Operations news release on the expansion of its Liquid Cooling Systems connector portfolio, complemented by related information from the manufacturer’s product pages and documentation.

References

1. Amphenol Industrial – Expanded Liquid Cooling Connectors for Thermal Management
2. Amphenol Industrial – Liquid Cooling Systems product overview