RJ45 Network Connector PIN contact resistance and reliability of the four factors

The contact resistance of RJ45 network connector PIN PIN is mainly affected by the contact material, vertical pressure, surface morphology, service voltage and current and other factors. 1. The technical conditions of the network connector for contact parts are specified for the inserted contact parts of the same specification made of different materials

The contact resistance of RJ45 network connector PIN PIN is mainly affected by the contact material, vertical pressure, surface morphology, service voltage and current and other factors.

1. Contact material

The technical conditions of network connector specify different contact resistance assessment indexes for the plug-fitted contact parts of the same specification made of different materials. Quickly separate environmental electric connector total GJB101-86 norms, 1 mm diameter plug with contact element, the contact resistance of copper alloy 5 m or less Ω, ferroalloy Ω 15 m or less.

2. Surface vertical pressure of contact surface

The surface vertical pressure of a contact is the force generated by the surfaces in contact with each other and perpendicular to the contact surface. With the increase of vertical pressure, the number and area of contact micropoints increase gradually, and the contact micropoints transition from elastic deformation to plastic deformation. The contact resistance decreases as the concentration resistance decreases.

The contact positive pressure mainly depends on the geometry and material properties of the contact.

3. Surface morphology

The shape of the surface morphology including design and state of the environment, on the surface of the contact may be due to dust, rosin, oil and other mechanical attachment of sedimentary formation in contact surface is loose surface film, the film of table with a particulate matter easily embedded hidden in microscopic pits on the surface of the contact, the contact area, contact resistance increases, and unstable. Secondly, due to the fouling film formed by physical adsorption and chemical adsorption, the metal surface is mainly chemically adsorbed, which is generated by electron migration after physical adsorption. Therefore, for some products with high reliability requirements, such as aerospace electrical connectors must have clean assembly and production environment conditions, perfect cleaning process and necessary structural sealing measures, the use unit must have good storage and operation environment conditions.

4. Service voltage

When the service voltage reaches a certain threshold, the film layer of the contact part will be broken down, and the contact resistance will drop rapidly. However, the thermal effect accelerates the chemical reaction in the area near the film layer, which can repair the film layer to some extent. So the resistance is non-linear. Near the threshold voltage, small fluctuations in the voltage drop cause currents to vary by a factor of 20 or dozens. Make a significant change in the contact resistance, and failure to understand this can result in errors in testing and using the contact.