DE-9 Plug with Grounding Indents
The Molex 1731091043 is a 9-position D-Sub plug from the F, FCT 173109 series, configured as a DE-9 (shell size 1) with machined male pins arranged in two rows. This is the standard-density layout used for RS-232 serial, instrumentation, and industrial control interfaces where 9 signal circuits are needed in a compact, keyed shell. The steel shell with tin plating and grounding indents provides a low-impedance path to chassis ground, bleeding shield currents before they couple into the signal pins. The housing is glass-filled polyester rated UL94 V-0, and the contacts are machined from copper alloy.
Grounding Indents and Shell Design
This is a practical EMC feature for assemblies where the cable shield terminates at the backshell — the indents ensure the shield path is continuous through the mated pair, reducing radiated emissions and susceptibility in industrial environments with motor drives or switching power supplies nearby.