Why Are Printed Circuit Boards Usually Green?

Views: 188 Author: Site Editor Publish Time: Origin: Site

What is a printed circuit board or PCB?

The printed circuit board is also known as printed wires, PCB for short. The insulation board is used as a raw material with a conductive pattern and hole cut to a certain size (such as holes fixed to the part, holes fixed with holes, etc.) to replace the pad of the electronic devices and connect between the electronic parts.

 In addition, the PCB is an important supporter of electronic components, electronic components, and electrical connections. So the reason why a printed circuit board is electronic printing.

The most common colors used for printing component legends are white for boards with a green, blue or red anti-sold mask, and black when the mask is white or yellow. However, there are other options available according to the needs of each client.

White component legend over red mask

One way to obtain better costs in the manufacture of the printed circuit board is to evaluate the real need for this component legend on both sides, and sometimes even only on the face of the components.

These cases occur mainly on boards with very few components and that the assemblers already perform the work with “eyes closed”. Of course, the presence of the legend offers a more professional appearance to the sign, but in situations where the sign does not even appear to the end customer and any cost reduction is important, the real advantage of keeping the legend must be analyzed.

Caption with little information

It is quite common to find boards with only a few characters on the solder side of the board, which was kept for mere distraction and was not even necessary. Its presence on the board ends up contributing to an increase in cost and even increasing the production delivery time.

PCB

What role do PCBs play?

PCBs play a role in avoiding errors with manual wiring, automatic insertion or assembly of electronic components with a soldering iron, as well as PCB consistency testing and good quality of electronic devices, improving labor productivity and cost savings to improve costs after PCB use electronic devices.

How is the printed circuit board evolving?

The printed circuit board retains its own trends from single-layer to double-layer, multilayer and flexible. It can be seen that PCB is showing great momentum in the process of developing electronic devices with PCB development for high accuracy, high density and reliability, and works well in saving costs, improving properties and shortening volume.

There is no doubt that our same view is the development of PCB manufacturing technology trends in the future, moving towards high density, high precision, small hole size, small wires, low pitch, reliability, multilayer, high speed, light and thin type. Hat further improves PCB production, saves costs, reduces pollution, and low-volume PCB production.

History of printed circuit boards (PCBs)

Paul Eisler, Austria, the first person to manufacture a printed circuit board since 1936, took advantage of a radio PCB. And in 1943 the printed circuit board was used in military radio in America and in 1948, PCBs were officially used for business purposes. Thus, the printed circuit board was popular and has been in great boom since the mid-1950s.
The connection of the electronic components is based on a wired connection before the PCB arrives. Now, however, the wire is only used for the experiment in the lab; there is no denying that PCBs should play a leading role in the electronics industry.

What does the PCB contain?

PCBs are mainly used for bench, holes, mounting holes, wires, components, connectors, charges, electrical boundaries, etc. They play a different role than the following:

  • Pad: Used for soldering coated through the hole in the component pin.
  • Through hole: There is an intermediate copper and non-metal through and through the metal to connect the component pins between each layer.
  • Mounting hole: Used to secure the printed circuit board.
  • Wiring : Connecting the electrical copper foil of the component pins.
  • Connector: For connecting components to a PCB.
  • Charger: Used for the copper cladding of the earth grid, so it has a great effect on reducing impedance control.
  • Electrical Limit: To ensure the size of the PCB and the components must not exceed their limits.

PCB

What are the benefits of PCBs?

The popularity of PCBs is that PCBs have some special advantages.

High Density: High density PCBs have been upgraded for decades with improvements in integrated circuit integration and assembly techniques.

High reliability: You can make sure that the PCB is good to test for a long time.

Determinability: There are some requirements for PCB properties; this can have a big impact on PCB design with standardization design. Such as time saving and high production are efficient.

Manufacturability: It can be produced by standardization, sizing and automation, and thanks to modernization management, the quality of PCB production is consistent.

Testability: Set up a great test mode and standard to test and detect PCB yield and shelf life.

Mountablity: The PCB is not only easy to connect, but also manufactures automatically and normally. In addition, the PCB and some components are mounted on large parts and the machine.

Sustainability: Standardization of components as PCBs and components are highly designed and manufactured. So it is convenient and fast to change and restore after dismantling the system.

Why are printed circuit boards usually green?

There is confusion as to why printed circuits are usually green in color for electronics hobbies and engineers. However, what is the color of the PCB before we learn the question? It's actually called a solder mask. The purpose of the solder mask is to protect against electronic traces of moisture and dust and to control the flow of molten solder. And there are other colors for PCB, such as yellow, blue, red, black, etc.,

so why green?

First, it has the most popular and long history of making the solder mask green. In fact, cheaper than other colors.

Second, as we all know, every forum needs PCB manufacturing and PCB assembly, with some processes going through the yellow site of PCB manufacturing. What’s more, you need to do the HAL, PCBA, and AOI tests with SMT soldering, which have optical positioning calibration to make the color green easier and more efficient.

Third, it is clear that there are some common colors for PCBs such as red, yellow, green, blue and black. As a problem with the process, a lot of testing the lines relies on workers to visually check in the past, it’s hard and hard to do this work in hard light, so the color green is good for their eyes. Fortunately, the flying probe test is popular. However, the color green continues.

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