A PCB stencil is a sheet of stainless steel with laser-cut openings used to place solder paste on a PCB board for surface mount component placement. The PCB stencil is used to deposit solder paste on designated places on a bare PCB board so that components can be placed and perfectly aligned on the board.
Its main function is to accurately deposit the accurate amount of solder paste on SMT pads so that the solder joint between the pad and the component is perfect concerning the electrical connection and mechanical strength.
PCB stencils are manufactured by creating openings through lasers on a stainless steel foil based sheet at the positions where Surface Mount components need to be placed on a board. Then, this stencil is placed on the top of the PCB and aligned perfectly using positioning points called fiducial marks. After alignment, the solder paste is applied with a metal squeegee blade. As a result of this, the solder paste gets placed on the PCB board where the surface mount components need to be placed. So when the stencil is removed, components can be placed on the board.
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