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  2. Printed circuit board - Wikipedia

    en.wikipedia.org/wiki/Printed_circuit_board

    Copper thickness of PCBs can be specified directly or as the weight of copper per area (in ounce per square foot) which is easier to measure. One ounce per square foot is 1.344 mils or 34 micrometers thickness. Heavy copper is a layer exceeding three ounces of copper per ft 2, or approximately 0.0042 inches (4.2 mils, 105 μm) thick. Heavy ...

  3. Thousandth of an inch - Wikipedia

    en.wikipedia.org/wiki/Thousandth_of_an_inch

    The thickness of items such as paper, film, foil, wires, paint coatings, latex gloves, plastic sheeting, and fibers For example, most plastic ID cards are about 30 thou (0.76 mm) in thickness. Card stock thickness in the United States, where mils are also called points. [2] Gauge (diameter) of strings in stringed instruments [3] [4]

  4. Ounce - Wikipedia

    en.wikipedia.org/wiki/Ounce

    The most common unit of measure for the copper thickness on a printed circuit board (PCB) is ounces (oz), as in mass. It is the resulting thickness when the mass of copper is pressed flat and spread evenly over a one-square-foot area. 1 oz will roughly equal 34.7 μm. [19]

  5. List of electronic component packaging types - Wikipedia

    en.wikipedia.org/wiki/List_of_electronic...

    Problematically, some manufacturers are developing metric 0201 components with dimensions of 0.25 mm × 0.125 mm (0.0098 in × 0.0049 in), [31] but the imperial 01005 name is already being used for the 0.4 mm × 0.2 mm (0.0157 in × 0.0079 in) package. These increasingly small sizes, especially 0201 and 01005, can sometimes be a challenge from ...

  6. Copper foil - Wikipedia

    en.wikipedia.org/wiki/Copper_foil

    Electrodeposited copper foil, also known as electrolytic copper foil, is produced by electroplating copper onto a rolling drum in a highly controlled manner. This type of copper foil has uniform thickness and excellent electrical conductivity, making it ideal for high-performance electronic applications. Rolled Annealed (RA) Copper Foil

  7. Perfboard - Wikipedia

    en.wikipedia.org/wiki/Perfboard

    Software for PCB layout can often be used to generate perfboard layouts as well. In this case, the designer positions the components so all leads fall on intersections of a 0.1 inches (2.54 mm) grid. In this case, the designer positions the components so all leads fall on intersections of a 0.1 inches (2.54 mm) grid.

  8. Motherboard form factor - Wikipedia

    en.wikipedia.org/wiki/Motherboard_form_factor

    In computing, the motherboard form factor is the specification of a motherboard – the dimensions, power supply type, location of mounting holes, number of ports on the back panel, etc.

  9. UL 94 - Wikipedia

    en.wikipedia.org/wiki/UL_94

    Tests are generally conducted on a 5 × 1 ⁄ 2 in (127 × 12.7 mm) specimen of the minimum approved thickness. For 5VA and 5VB ratings, tests are performed on both bar and plaque specimens, and the flame ignition source is approximately five times as severe as that used for testing the other materials.

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