Affect the RJ45 connector PIN pin contact resistance and reliability of the four major factors

RJ45 connector The contact resistance of the PIN pin is mainly affected by factors such as contact material, vertical pressure, surface shape, voltage and current.

1, RJ45 Connector contact material

RJ45 Connector Electrical connector technical conditions for different materials produced with the specifications of the plug contacts, provides a different contact resistance assessment indicators. Rapid separation of environmentally friendly electrical connector General specification GJB101-86 provides a diameter of 1mm plug contact contact resistance, copper alloy ≤ 5mΩ, iron alloy ≤ 15mΩ.

2, RJ45 Connector the surface of the contact surface vertical pressure

RJ45 Connector The vertical pressure of the contact surface refers to the force generated by the surface in contact with each other and perpendicular to the contact surface. With the increase of vertical pressure, the number and area of contact micro points increase gradually, and the contact microstring changes from elastic deformation to plastic deformation. As the resistance is gradually reduced, leaving the contact resistance is reduced.

The contact pressure is mainly dependent on the geometry of the contact and the material properties.

3, RJ45 Connector surface morphology

RJ45 Connector The surface morphology includes the shape of the design and the state of the environment in which the surface of the contact piece may be mechanically attached to the surface of the contact surface due to dust, rosin, oil, etc., which is easily embedded with the particulate matter Hidden in the contact surface of the micro-pits, so that the contact area is reduced, contact resistance increases, and very unstable. Second, due to the physical adsorption and chemical adsorption formed by the pollution film, the metal surface is mainly chemical adsorption, it is in the physical adsorption with the electronic migration caused by. Therefore, some high reliability requirements of the product, such as aerospace electrical connectors must have a clean assembly production environment conditions, improve the cleaning process and the necessary structural seal measures, the use of units must have a good storage and use of operating conditions The

4, RJ45 Connector the use of voltage

RJ45 Connector When the voltage reaches a certain threshold, the contact film is broken, and the contact resistance is rapidly decreased. However, due to the thermal effect of the film near the accelerated chemical reaction, the film has a certain repair effect. So the resistance is non-linear. In the vicinity of the threshold voltage, the small fluctuations in voltage drop can cause the current to change within 20 or several times. So that the contact resistance has undergone great changes, do not understand this situation will test and use the contact when the error.