Glossary & Terminology PCB Manufacturing QualiEco Canada

Glossary and Abbreviations - PCB Glossary

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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.

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