PCB Legend Printing - China PCBA Supplier

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A printed circuit board (PCB) legend is a layer of text that is applied to the PCB to identify components and offer additional helpful information. Legend text is printed as a final stage in the circuit board manufacturing process on top of the solder mask. It is sometimes referred to as silkscreen or component identification.

A legend helps guarantee that parts are assembled correctly and continue to work when they reach customers by displaying the right orientation and positioning of components as well as offering additional information about the circuit board. Thus, you ought to always intend to have a legend on your circuit boards. It should have a legible font in either white or black ink, and any text you put on your circuit board should adhere to the clearance requirements specified by the manufacturer to ensure that the entire legend is visible.

A legend is often printed on one or both sides of the PCB. It contains the component designators, switch settings, test points and other indications helpful in assembling, testing, servicing, and sometimes using the circuit board.

Even while a PCB might not technically need a legend to work, the information in this text is essential for end users to assemble, test, and debug the board. Typical details seen in a PCB legend include the following:

There are three methods to print the legend.

Silk screen printing epoxy ink was the established method. It was so common that legend is often misnamed silk or silkscreen.

Liquid photo imaging is a more accurate method than screen printing.

Ink jet printing is new but increasingly used. Ink jet can print variable data, unique to each PWB unit, such as text or a bar code with a serial number.