PCB terminals and connectors
We are pleased to provide you with information on the materials, contact surfaces and insulation materials we use as follows.
All the metals used by Weidmüller are selected and processed with their surfaces treated according to the latest technical standards, and are compliant with the RoHS (Restriction of Hazardous Substances) EU Directive.
Steel parts are electrogalvanised and treated with an additional passivation technique. The surface protection conforms to the highest standards, is matched to the special requirements of the connection systems used and is RoHS-compatible. Experience gained from storage in outdoor test racks at different locations (industrial, marine, tropical and normal atmospheres) has been incorporated into the design of the surface protection.
The current-carrying materials copper, brass and bronze are characterised by a high conductivity plus good mechanical properties. The surfaces are usually given a coating of tin, which creates an extremely good, “malleable” contact with a low contact resistance. Apart from ensuring consistently good electrical properties, the tin coating provides excellent protection against corrosion. Solder connections are also given a coating of tin. In order to guarantee the long-term solderability (shelf life), the brass parts are given an additional nickel coating as a diffusion barrier. The nickel coating provides effective protection against the loss of zinc atoms from the brass.
The heart of a connector is its contacts. They make up the actual detachable connection. Two types of contacts make this possible: male and female connectors. The pin conducts the electrical connection along its outer surface. It is inserted into the socket, which conducts the electrical connection along the surface of its interior side. The contacts on OMNIMATE plug-in connectors consist of copper alloys. The contact surfaces have different galvanic coatings according to the operating conditions.
Tin-plated contact surfaces are the standard surfaces for OMNIMATE plug-in connectors at Weidmüller. These surfaces are ideally suited for normal operating conditions in the industrial environment, while high contact forces and the relatively low degree of hardness of the surface material ensure low contact resistances. Tin-plated contact surfaces are suitable for transmitting higher currents and voltages (>100 mV and >100 mA) and for low plugging cycles.
Due to its high conductivity, silver is excellently suited to high-current applications. OMNIMATE Power products come equipped with silver-plated contact surfaces, depending on their performance class.
Gold-plated contact surfaces are more resistant against climatic, corrosive and especially mechanical stress conditions. The latter mainly occur as a result of vibrations or high plugging cycles. Gold surfaces have the best properties for transmitting low currents and voltages (<100 mV and <3 mA).
Insulating materials In order to do justice to the different requirements placed on our products, it is necessary to use various insulating materials tailored to the particular application. None of the insulating materials used by Weidmüller contain any hazardous substances. Above all, we ensure that all our materials are free of cadmium. They contain no colour pigments based on heavy metals and do not lead to the formation of dioxin or furan.
Download: Overview of insulating materials as a PDF file
Wire connection technologies – From crimp connection to clamping yoke connection
Soldering and process – SMD and THR technology
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