What is the reliability of the RJ45 connector contact resistance?

1、Contact Material

Electrical connector technical conditions for different materials made with the same standard insert contact, rules different contact resistance check objectives. Gjb101-86, general specification for agile, environmentally resistant electrical connectors, contact resistance of 1mm diameter inserts, copper alloy ≤5m ω, iron alloy ≤15m ω.

2、RJ45 connector surface shape

The surface shape includes the planned shape and the environmental condition of the location. The surface of the contact may be a slackened surface film formed by the accumulation of dust, rosin, oil, etc. , the surface film with particles can be easily embedded in the contact surface of the micro-pits, so that the contact area is reduced, contact resistance is increased, and extremely unstable. Second, because of the physical adsorption and chemical adsorption formed by the fouling film, the metal surface is the first chemical adsorption, it is in the physical adsorption with the removal of electrons occurred. Therefore, it is necessary for some high reliability products, such as electrical connectors for aerospace, to have clean installation and production environment conditions, perfect cleaning skills and necessary structural sealing methods, it is necessary for the operating unit to have excellent storage and operating conditions.

3、The vertical pressure on the surface of the contact

The vertical pressure on the contact surface is the force that occurs on the contact surface and is perpendicular to the contact surface. With the increase of vertical pressure, the number and area of contact microdots increase gradually, and the contact microdots change from elastic deformation to plastic deformation. The contact resistance decreases as the contact resistance decreases. The positive contact pressure mainly depends on the shape and material function of the contact parts.

4、Apply voltage

When the applied voltage reaches a certain threshold, the contact film will break down, and the contact resistance will decline quickly. However, due to the thermal effect, the chemical reaction in the vicinity of the film is accelerated, which has a certain correction effect on the film. So the resistance is nonlinear. At the threshold voltage, a slight wobble in the voltage drop can cause the current to vary in a range of perhaps 20 or dozens of times. Make contact resistance to change a lot, do not understand this situation will be in the test and use of contact error