Today I will tell you how to identify the PCB surface treatment process by color?

The outer layer of the surface of the circuit board usually has three colors: gold, silver, light red. Gold is the most expensive, silver is less expensive, and light red is the cheapest. So, how to distinguish PCB manufacturing surface treatment process by color?

Distinguish PCB surface treatment process by color

1. Gold

Gold is real gold, and even though it's only a thin layer, it accounts for nearly 10% of the board's cost. The purpose of using gold is to facilitate welding and to prevent corrosion. The gold-plated layer is mostly applied to the gold finger of the circuit board, the shrapnel of the connector, the pad of the component, etc.

2. Silver

The silver circuit board is called a tin-sprayed board, and a layer of tin is sprayed on the outer layer of the copper circuit, which is conducive to soldering. The tin plate has little effect on the components that have been soldered, but for the solder pads that are exposed to the air for a long time, due to insufficient reliability, it is very easy to oxidize and corrode after long-term use, so that poor contact occurs. .

3. Light red

Organic solder flux is OSP. It is an organic substance rather than a metal. The price is cheaper than HASL. Before soldering, it is necessary to ensure that the inner copper foil will not be oxidized. During the heating process of soldering, the organic flux film is released. OSP can weld copper wires and components together when soldering, but it is mainly not resistant to corrosion. If an OSP circuit board is exposed to the air for more than 10 days, components cannot be soldered.

The above are the knowledge points shared with you to identify the PCB surface treatment process by color. If you want to know more, you can pay attention to PCBAMake. If you need to know more about PCB prototype, SMT PCB patch, PCBA service, etc., welcome to feel free Very message.