QualiEco Resources
Glossary and Abbreviations - PCB Glossary
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Alphabet M
- Major DefectA defect that is likely to result in failure of a unit or product by materially reducing its usability for its intended purpose.
- MaskA material applied to enable selective etching, plating, or the application of solder to a PCB. Also called solder mask or resist.
- Master aperture listAny aperture list which is used for two or more PCB’s is called master aperture list for that set of PCB.
- MeaslingDiscrete white spots or crosses below the surface of the base laminate that reflect a separation of fibers in the glass cloth at the weave intersection.
- Metal FoilThe plane of conductive material of a printed board from which circuits are formed. Metal foil is generally copper and is provided in sheets or rolls.
- Micro-SectioningThe preparation of a specimen of a material, or materials, used in metallographic examination. This usually consists of cutting out a cross-section followed by encapsulation, polishing, etching, and staining.
- MicroviaUsually defined as a conductive hole with a diameter of 0.005" or less that connects layers of a multilayer PCB. Often used to refer to any small geometry connection holes created by laser drilling.
- MilOne thousandth of an inch.
- Minimum Traces & SpacingTraces are the “Wires” of the Printed Circuit Board (also known as tracks). Spaces are the distances between traces, the distances between pads, or the distances between a pad and a trace. How wide is the smallest trace (line, track, wire), or space between traces or pads? Whichever is less of the two governs the order form selection.
- Mounting HoleA hole that is used for the mechanical support of a printed board or for the mechanical attachment of components to a printed board.
- Minimum Conductor WidthThe smallest width of any conductors, such as traces, on a PCB.
- Minimum Conductor SpaceThe smallest distance between any two adjacent conductors, such as traces, in a PCB.
- Minor DefectA defect that is not likely to result in the failure of a unit of product or that does not reduce the usability for its intended purpose.
- Multilayer PCBThe pads and traces are on both sides and also there are traces embedded within the board. Such PCB’s are called Multilayer PCB.
PCB Design Tips
When designing a PCB, try to limit
the amount of draws you use.
Draws use a lot of memory and slows the programming time. Ex.: Use a flash for pads instead of draws. If for some reason we need to increase or decrease that pad size, it can easily be done by changing the D-code but if they are done with draws it could be a nightmare.
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