MX123™ Sealed Connection System
2.54mm (.100”) Pitch
FEATURES AND SPECIFICATIONS
Molex has developed a fully-sealed, high-performance MX123™ connection system that offers the
smallest packaging size in the industry, designed for transportation power-train applications that
accommodate low-level signal and high-current load requirements
31386 53-Circuit Vertical Headers
31387 73- and 80-Circuit
Vertical Headers
34566 73- and 80-Circuit Lever
(Mate-Assist) Receptacles
34576 49- and 56-Circuit Lever
(Mate-Assist) Receptacles
34565 73- and 80-Circuit
Wire Dress Covers
The MX123 is a fully sealed, high-performance
connection system that has been optimized for
transportation power-train applications in the most
challenging under-hood environments. MX123
connection systems are currently 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 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- 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.
The system consists of lever (mate-assist) receptacles The MX123 lever receptacles mate with the MX123
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 by eliminating
the need for crimping individual cable seals. The
interfacial seal is interior to the connector shroud,
protecting if from damage during harness handling.
vertical headers. The headers have been designed to
provide customer flexibility by offering two
mounting-style options, three PCB electrical
strategies and multiple-plating options. The headers
are designed to be vertically mounted from the top
or bottom of a casting. They are available for
through-hole solder processing, compliant-pin, or
wire-bonding technologies with precious plating
(Gold or Silver). For more information on the Molex
MX123 connection system, visit:
34575 49- and 56-Circuit
Wire Dress Covers
33467, 33468
MX64
Receptacle Terminals
34586 0.64mm (.025")
TerminalService Tool
www.molex.com/ind/mx123.html.
D
B
C
A
B
A
MX123 Headers Mounted on a Under-Hood Engine Control Module
A: Up-Integrated Module (Custom from Molex)
B: 73-Circuit Lever Receptacle (Series 34566)
A: 80-Circuit Header (Series 31387)
B and C: 73-Circuit Header (Series 31387)
D: 56-Circuit Header (Series 31386)