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All measurements below are given in mm. To convert mm to mils, divide mm by 0.0254 (i.e., 2.54 mm / 0.0254 = 100 mil). C Clearance between package body and PCB. H Height of package from pin tip to top of package. T Thickness of pin. L Length of package body only. L W Pin width. L L Pin length from package to pin tip. P
The thou, or mil, is most commonly used in engineering and manufacturing in non-metric countries. For example, in specifying: 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.
A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil (one thousandth of an inch or 0.0254 mm). It is equal to π /4 square mils or approximately 5.067 × 10 −4 mm 2 .
PCB via current capacity chart showing 1 mil plating via current capacity & resistance versus diameter on a 1.6 mm PCB. In printed circuit board (PCB) design, a via consists of two pads in corresponding positions on different copper layers of the board, that are electrically connected by a hole through the board.
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).
1 square mil is equal to: 1 millionth of a square inch (1 square inch is equal to 1 million square mils) 6.4516 × 10 −10 square metres; about 1.273 circular mils (1 circular mil is equal to about 0.7854 square mils). 1.273 ≈ 4 / π and 0.7854 ≈ π / 4 .
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Length (system unit unit-code symbol or abbrev. notes sample default conversion combination output units SI: megametre: Mm Mm US spelling: megameter 1.0 Mm (620 mi) kilometre