How to install pogo pins?
Analysis of the problem of abnormal gold plating of pogo pins in POGO PIN connectors
The pins of POGO PIN connector pogo pins are usually made of brass, which is a very active metal. When exposed to air, it reacts with oxygen in the air and the surface oxidizes.
Therefore, POGO PIN pogo pins must be surface-plated, more commonly gold-plated, nickel-plated, zinc-plated, silver-plated, etc. Today we will discuss some of the problems that POGO PIN pogo pins will encounter during the gold plating process.
The gold plating process plays an important role in POGOPIN pogo pin coating. At present, gold plating is still performed in the holes of a large number of pinhole components by barrel plating and vibration plating, except for some material pogo pins that are selectively plated with gold. . In recent years, the size of the connector has become more and more miniaturized, and the quality of gold plating in the hole of the pinhole portion has become more prominent. The quality requirements of users for the gold layer are also getting higher and higher, and some users also have higher and higher appearance quality of the gold layer. Even at very critical levels, these common quality issues can always improve the quality of the connector's gold plating to ensure the quality of the connector's gold plating. The reasons for these quality problems are discussed one by one.
1. The color of the gold-plated layer of the pogo pin is abnormal. The color of the gold-plated layer of the spring pin is inconsistent with the color of the ordinary gold layer, or the gold layer of different parts of the same auxiliary product has a different color. This is one of the most common problems with electroplating.
2. The influence of impurities in the pogo pin gold-plated raw material
When the impurities introduced into the plating solution exceed the tolerance of the gold plating solution, the color and brightness of the gold layer will be quickly affected. If affected by organic impurities, the gold layer will appear dull. The film is very dark and the position of the hair is not fixed. If metal impurities interfere, the effective range of current density will be narrowed. The Hall cell test shows that the current density of the test piece is not bright at the low end or plate at the high end and not plated at the low end. Reflecting that the electroplating is red or even blackened, the color change in the hole is more obvious.
3. The gold-plated current density of the pogo pin is too high.
Since the total area of the plated part is incorrectly calculated, the value is larger than the actual surface area, so the amount of gold plating current is too large, or when gold plating is used, the amplitude of gold plating is too small to crystallize all or part of the gold plating in the groove, and visually Watch gold. This layer is red.
The installation method of the pogo pin is:
1. Surface mount
The pogo pin is usually installed stably, and the bottom of the needle tube is a flat bottom design, so we can use a vertical or horizontal package, which makes it easier to solder with the PCB. Also, some needles have locating pins on the end so there is no offset and it will work better.
2. Installation method of straight solder tail
Ordinary plug-in package for easy soldering. In addition, we often use tail-end plug-in packages, which also gives pogo pin manufacturers more options in terms of space utilization.
3. Floating installation
Mainly adopts a double-head double-acting design, which is more suitable for connection without welding pressure, allowing engineers to have more space flexibility when making two-way board-to-board connections.
There are many other installation methods for POGO PIN pogo pins. We also need to choose according to our actual situation.
