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Molex MX123 80 circuit mated header and receptacle.

MX123 Connectors

Designed for transportation power-train applications requiring reliable connections in high-vibration under-the-hood environments, the MX123 Sealed Connection System offers a rugged, fully-sealed interface with the smallest packaging size in the industry.

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Circuits Current Wire AWG
49 to 80 11.0A, 25.0A 22 to 18

PCB Headers

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Molex MX123 header.

Connector Accessories

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Molex MX123 circuit dress cover.

Features and Benefits

Automotive powertrain OEM’s have needed a connection system specifically designed for engine and transmission control module applications. These modules are located in harsh, high-vibration environments under the hood or chassis of automobiles, so connector retention and durability are very important requirements. In order to seamlessly fit into the modules, packaging size is an important attribute for these applications as well.

The MX123 Sealed Connection System is certified to GMW3191 specs, which means that the product has been tested, and has performed well in, very harsh, hot, high-vibration environments. The system utilizes matte-seal technology to create an extremely resilient sealed connector system with the smallest packaging size in the industry. Multiple polarization, wire-dress and PCB-tail options and integrated TPA and CPA components assist in keeping the interface mated and free up valuable time in the assembly process.

GMW3191 specifications
Designed specifically for high-vibration under-the-hood applications
Meets IP67, IP68 and IP69k sealing specs, Temp Class III operating temperature specs and Vibe Class I vibration specs

Center-wall feature
Prevents scooping
Extends past the length of the terminals to enable connection in blind-mate conditions

Header terminal filtering
Eliminates cross talk between adjacent circuits in up-integrated systems

PCB tail customization: solder-tail or compliant-pin technology
Enhances PCB design flexibility

Precious-metal plating
Stabilizes contact resistance under severe temperature and vibration conditions

Matte-seal technology
Allows closer center-to-center terminal spacing, which reduces packaging size to the smallest in the industry
Eliminates the need for crimping individual cable seals
Reduces harness-assembly complexity

Integrated TPA and CPA components
Assists mating reliability
Protects against un-mating in high-vibration environments. Reduces assembly complexity

Six unique mechanical polarization options and unique color coding
Offers the ability to use multiple connectors on one module while eliminating the risk of cross-mating incorrect connectors

Two wire-dress options
Creates flexibility in wire-routing design with both 0° and 180° orientations

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Rugged Reliability for Powertrain Wiring Applications

Conditions are tough under the hood. Meeting the harsh demands of powertrain applications in the automotive and commercial vehicle industries, MX123 Sealed Connectors combine small package size with rugged features. The design boasts terminal position assurance (TPA) and connector position assurance (CPA) to resist vibration effects while meeting GMW3191 and IP67, IP68 and IP69k seal rating specifications.

Applications by Industry

Audio, navigation, infotainment
Automotive Vehicles
Body Electronics
Construction Equipment
Industrial Vehicles and Equipment
Power Train
Recreational Vehicles

This is not a definitive list of applications for this product. It represents some of the more common uses.