SMT Stepped Stencil
SMT Stepped stencils provide practical, workable solutions in a number of different applications:
- Multilevel SMT stepped stencils vary the foil thickness locally to improve paste release on fine features or increase volumes on large or through-hole prints
- 3-D cavity stencils have topographies on the contact side to fit down into PCB cavities
- BGA ball drop stencils often have “standoffs” built into the contact side to prevent sticky flux buildup on the stencil or in the apertures.
- Semiconductor ball drop stencils are similar to BGA ball drop stencils, but far more precise due to their small scale
SMT Stepped stencils can be created by a variety of manufacturing processes. Chemical milling (Chemical Etching), Laser Welding (Step up only) & Micromachining.
Datum produce multi-level, micro-machined step stencils in one continuous operation creating stepped stencils without distortion or burrs. Micro-Milling is the most flexible stepping method, able to create unlimited shapes, patterns, wall profiles and cavities.
All Datum materials are compatible with micro milling; for walls as thin as 20 µm, Datum Tension is suggested.
SMT Stepped Stencil
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Welding locally changes the thickness of the foil by cutting identical slugs from the base stencil foil and the same material of a different thickness. The replacement piece is then welded into place in the base stencil before laser cutting. All Datum materials are compatible with laser welding processes.
Micromachining, or micromilling, uses a very precise CNC positioning system with very small, hard cutting tools to remove steel without distortion or burrs. It is the most flexible stepping method, able to create unlimited shapes, patterns, wall profiles and cavities. It is the most economical method of creating stencils with -multiple steps, or stencils that need contact side relief for board snuggers or labels. All Datum materials are compatible with micromilling; for walls as thin as 20 µm, Datum Tension is suggested.
Resources
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Stencil Stepping Datasheet US
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Stencil Stepping Datasheet UK
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