Molex Distributor

MX123™ Sealed Connection Systems


Molex's high-performance MX123™ connection system offers the smallest packaging size in the industry


Molex's MX123™ Sealed Connection SystemsMolex's fully sealed, high-performance MX123™ connection system offers the smallest packaging size in the industry, designed for transportation power-train applications that accommodate low-level signal and high-current load requirements.

MX123 is a fully sealed, high-performance connection system optimized for transportation power-train applications in the most challenging under-hood environments. MX123 connection systems are used in on-engine automotive applications, off-road construction, and industrial equipment. The MX123 system maintains low and stable contact resistance under severe temperatures and vibrations.

The system consists of lever (mate-assist) receptacles that reduce harness-assembly complexity by integrating the housing, lever, Positive Latch Reinforcement (PLR), and Connector Position Assurance (CPA) components. Sealing performance and package size are optimized by utilizing interfacial and matte-seal technologies. The matte-seal technology reduces package size and harness-assembly complexity by allowing closer center-to-center terminal spacing and eliminating the need for crimping individual cable seals. The interfacial seal is interior to the connector shroud, protecting if from damage during harness handling. The header pins are protected from scooping by a center wall that extends longer than the terminal length. This innovative connection system is based on two terminal systems, 064-size and 280-size terminals, to provide optimal electrical performance. The 064-size terminal system has increased normal force and selective precious plating, required to maintain performance characteristics in the most demanding environments.

Features Applications
  • Receptacle and header housings with 6 unique mechanical polarization options and unique color coding
  • Wire dress available in two options: 0 and 180° orientation
  • Anti-scooping features
  • Integrated TPA and CPA
  • Available with pin deletes (knock out patterns)
  • Optional header terminal filtering
  • PCB tail customization: available with solder-tail or
    compliant-pin technology
  • Header placement flexibility
  • Precious plating
  • Lever retention lock on harness connector
  • Automotive
    • Audio, navigation, infotainment
    • Automotive vehicles
    • Body electronics
    • Construction Equipment
    • Industrial vehicles and equipment
    • Power train
    • Recreational vehicles
  • Commercial Vehicle
    • Heavy equipment systems

Digi-Key P/N Manufacturer P/N Description
WM7419-ND 0345860001 CONN GROMMET SEAL PLUG 0.64MM Datasheet
WM7409-ND 0345650003 CONN COVER WIRE DRESS 73-80POS
WM7415-ND 0345660803 CONN RCPT HOUSING 80POS CRIMP
WM7413-ND 0345660203 CONN RCPT HOUSING 73POS CRIMP
WM7417-ND 0345760703 CONN RCPT HOUSING 56POS CRIMP
WM7411-ND 0345660103 CONN RCPT HOUSING 73POS CRIMP