Impedance is also a parameter that customers who use pogo pin charging solutions are concerned about. So what does the contact impedance of the spring loaded pin mean? There is no truly clean metal surface in the atmosphere. Even a very clean metal surface will quickly form an initial oxide film layer of several microns once exposed to the atmosphere. Therefore, from a microscopic analysis, any contact surface is a contaminated surface.

pogo pin and pogo pin connector

Comprehensive analysis shows that the real pogo pin contact resistance has the  following parts:

  1. Centralized resistor

When current passes through the actual contact surface, the resistance displayed due to the current line contraction (or concentration) is called concentrated resistance or contraction resistance.

  1. Film resistance

The film resistance formed by the contact surface film layer and other pollutants. From the contact surface state analysis, the surface contamination film can be divided into a relatively solid film layer and a relatively loose impurity contamination layer. So to be precise, the film resistance can also be called the interface resistance.

  1. Conductor resistance

When actually measuring the contact resistance of the electrical connector contact, it is done at the contact lead end, so the contact resistance actually measured also includes the conductor resistance of the contact and the lead wire itself outside the contact surface. The conductor resistance mainly depends on the conductivity of the metal material (pogo pin raw material is brass) itself, and its relationship with the ambient temperature can be characterized by the temperature coefficient.

pogo pin

The contact impedance is related to the current size of the pogo pin. Many high-current solutions require lower impedance to achieve a high-current pogo pin of more than 5A. CFE provides you with various application solutions such as high-current pogopin and waterproof pogo pin. CFE has passed eight quality management system certifications and has a CNAS system-certified laboratory to ensure product quality. CFE has complete automated intelligent manufacturing equipment and adopts vertical integrated production management to provide one-stop magnetic pogo pin connector standard selection and customized solutions for customers in various fields.