1. Selection of pogo pin springs
Pogo pin springs are made of beryllium copper, stainless steel, and piano steel wires. Various materials have their own unique characteristics. In the field of spring design, some basic considerations are: working temperature, impedance, and elastic force requirements. The spring is basically silver-plated, and gold-plated for better electrical conductivity. Gold can better improve electrical conductivity and high thermal performance, as well as prevent oxidation and corrosion.
Second, the selection of pogo pin needle
The needle tube of the pogo pin is a deep-turned part. Usually, it needs to go through two processes of nickel plating and gold plating. First of all, it needs to be treated with nickel bottom. ) , gold plating is the usual surface treatment layer, and the thickness is basically 0.1~1.0 microns. For small-diameter and long blind-hole tubes, it is a challenge to plate the inner wall. Usually, we will open side holes at the bottom end to allow plating The liquid is fully refluxed at the bottom of the tube to ensure that the inner wall of the tube is deposited to the gold composition. Or we will inform the customer of the basic ratio of the design: length and inner diameter of the tube.
3. Selection of pogo pin needles
The needle shaft of the pogo pin is formed by turning and milling copper, which is basically gold-plated. It is the preferred treatment method because gold has excellent electrical conductivity and oxidation resistance. In addition, the thickness of gold plating definitely affects the life of the entire product, because of cost considerations we will choose the thickness of nickel bottom treatment and final gold plating. As for some other electroplating solutions, such as rhodium, palladium and some noble materials, different products will have some different needs.
Fourth, the spring pin assembly
After a finished pogo pin is produced, we need to assemble it to form a pogo pin connector. The terminals of pogo pin connectors are generally composed of plastic.