These markings are placed on the silkscreen of a circuit board to aid in identifying where a particular component or element is located and that the specificationin the case of componentsmatches what is given in the board’s BOM. This is also suitable for PCBs with solder thieves and teardrop solder pads. Reference designators are used to specify an assembly, subassembly, component, or other element type. Mounting holes, pilot hole: It is recommended that the locations of the mounting holes and pilot holes on the PCB be labelled as “M **” and “P **,” respectively.ĭirection of travel: For the PCBs that are required to be fed into equipment, such as wave soldering equipment, in a specific orientation, the direction of travel should be indicated on the board. Silkscreen characters, polarity and direction labels must not be covered by components.įor components installed horizontally (such as lying electrolytic capacitors), the silkscreen should include the component outline on the corresponding position.
#Silkscreen pcb code
The recommended position of the bar code on a typical board is shown in the figure below the position on non-standard boards can use this for reference.Ĭomponent labels, mounting holes and positioning holes must be indicated on the silkscreen clearly and should be located by the relevant features. The barcode should be orientated horizontally or vertically on the PCB, refrain from orientating the barcode at any other angle. The top and bottom sides of the PCB should also be marked with ‘T’ and ‘B’ (or similar). The font should be chosen such that it can be easily read. PCB board name and version: Board name and version should be placed on the top side of the PCB. The color is typically white, although other colors are also available. The graphics and text on PCB a circuit board is usually printed with a permanent non-conductive epoxy ink.
#Silkscreen pcb serial
The contents of the silkscreen can include PCB name, version, component serial number, polarity and direction label, barcode box, mounting hole location code, component footprint, board direction of travel indicator, anti-static label, heatsink label, etc. The silkscreen layer is the top layer of the PCB and serves as a reference indicator for placing components on the PCB. Any silkscreen text should follow the convention of left to right, top to bottom. Special requirements should be specified in the PCB’s drill hole layerįor high-density PCB design, the contents of the silkscreen can be chosen according to specific requirements. White should be the default silkscreen ink color. The minimum spacing between both is 6mil. The silkscreen must not overlap with solder pads or Fiducials. Recommended spacing between silkscreen objects is h 8mil. Designers must ensure that the silkscreen character’s height is large enough to be read by the naked eye (recommended h 50mil).
The width of the silkscreen line should be greater than 5mil.
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