Grommets offer simple connector screening

Edited by the Electronicstalk editorial team Feb 20, 2004

A new concept promises to simplify and speed up the creation of an effective EMI shield in multiway connector applications.

A new concept promises to simplify and speed up the creation of an effective EMI shield in multiway connector applications.

The connector grommet is extruded using Chomerics Cho-Seal 6370 conductive silicone elastomer.

The two-part assembly is designed to sit in a recess in one half of the housing and clamp down on the individual conductors when the second part of the housing is fitted and closed.

This ensures a good electrical connection and the creation of an effective EMI shield.

Clever design has resulted in just two different reversible parts being able to accommodate two-, four- and eight-way connectors.

Cho-Seal 6370 is a 60 shore A, UL94V0 rated flame retardant elastomer.

The material has a shielding effectiveness of 100dB from 50MHz to 10GHz.

A further important and useful characteristic of Cho-Seal 6370 is its corrosion resistance that results from its nickel graphite based formulation.

The conductive connector grommet offers significant benefits when compared to established methods of achieving an EMI shield.

The most popular technique in this type of application is to form the braiding around the cable into a grounding lead that is then either soldered to the chassis or secured using screws, nuts and washers.

This process is time consuming, offers poor repeatability and can prove unreliable over long periods of time.

In addition to custom profiles such as the conductive grommet, Cho-Seal 6370 is also available in a wide range of standard sizes and shapes.