QualiEco Resources
Glossary and Abbreviations - PCB Glossary
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Alphabet N
- NC DrillNumeric Control drill machine used to drill holes at exact locations of a PCB specified in NC Drill File.
- NC drill fileA text file which tells an NC drill where to drill its holes.
- NegativeA reverse-image copy of a positive, useful for checking revisions of a PCB and is often used for representing inner layer planes. When a negative image is used for an inner-layer it would typically have clearances (solid circles) and thermals (segmented donuts) that either isolate holes from the plane or make thermally relieved connections respectively.
- NetA collection of terminals all of which are, or must be, connected electrically. Also known as signal.
- NetlistList of names of symbols or parts and their connection points which are logically connected in each net of a circuit. A netlist can be captured from properly prepared schematic-drawing files of an electrical CAE application.
- NodeA pin or lead to which at least two components are connected through conductors.
- NotationA diagram on PCB to indicate the orientation and location of components.
- NomenclatureIdentification symbols applied to the board by means of screen printing, inkjetting, or laser processes.
- NotchIt is also called a slot, it can be seen only on the external side of the board, generally seen in mechanical layers used for routing.
- NPTHNon-plated Through Hole. We recommend that you include a drill drawing to identify the non-plated holes in your design. Because design packages often calculate the amount of clearance around a nonplated hole differently than a plated hole, the non-plated holes can end up with less allowance for passing through solid copper ground and power planes. While this is not a problem when the nonplated information is supplied in a drill drawing, it only becomes one if the non-plated information is omitted. The result being mounting holes that short the power and ground planes together. Remember to always identify your non-plated holes.
- Number of HolesThis is the total number of holes in the board. There is no influence on price and no limit to quantity of holes on 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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