Why are most PCBs green?

We see the color of the PCB board is actually the color of the soldermask, different colors of soldermask in the manufacturing role and different impact, resulting in the final manufacturer's choice is different.

The first is in the production of solder resist is needed to better let the ultraviolet light through, to ensure that the exposure needs to be exposed to the place, and different colors of solder resist on the ultraviolet light has a different impact, of which the green, blue and red light transmittance is higher, and is more suitable for the coating.

Secondly in the line inspection need to have circuit part and no circuit part has higher difference, using yellow and green such lighter color contrast is more obvious, and black and red such darker color contrast is more difficult to distinguish, so yellow and green is more suitable.

In addition, during machine and manual inspection, the color of the yellow solder resist would cause the difference between the yellow background and the solder joints to be less obvious, which is not conducive to efficient inspection, so yellow was excluded.

Finally, the green color has better comfort in the manual visual inspection, less likely to produce visual fatigue, so the green solder resist has become the mainstream, making the green PCB the most in demand, the output is much higher than the other colors, making the price cheaper, so most of the PCBs we see are green.

Of course, some businesses have special needs, will also customize different colors of PCB, black and blue PCB is currently the second most common color in addition to green, but the price is also more expensive, so it will generally be seen in the positioning of higher products, the future with the increase in demand for players, we will see more colorful PCB.

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