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Home » StencilCoach® » Passive Apertures

"Home Plate" Stencil Design: minimizes solder balling near passives

Instructions: This worksheet calculates the pad and stencil metrics for the "home plate" stencil design. Inputs are in the blue cells and StencilCoach® calculations are in the grey cells.

Definitions

  • A=Lmin-2Tmax
  • B=Pad Pitch=A+Y
  • C=Lmax+30
  • D=0.75Y
  • F=X-2
  • L=Passive length tolerances
  • Tmax=Passive max thickness
  • Wmax=Passive max width
  • X=Wmax+10
  • Y=0.5(C-A)

Land Patterns

Land Patterns

Stencil Apertures

Stencil Apertures
Input: mils

 

Output: mils

Aperture or Land

 

Aperture Only