Can I use my solder paste stencil for SMD glue?

Quick answer：No!

When prepping a board for high-yield manufacturing, getting your stencil design right is absolutely critical. We occasionally see confusion between the design requirements for SMD Glue Stencils and standard Solder Paste Stencils.

It is crucial to distinguish between these two distinct tools. Using the wrong stencil setup will lead to immediate manufacturing defects, such as component washout during wave soldering or complete electrical failure.

The fundamental difference boils down to two things: they are generated from different Gerber layers, and they deposit material at completely different locations on your board.

Here is the breakdown to keep your designs error-free:

Solder Paste Stencils

Gerber Source: Derived from the SMD Paste layer.

Target Location: The apertures sit directly over the exposed copper pads. This is precisely where the solder needs to wet the pads and component leads to form reliable electrical joints during reflow.

SMD Glue Stencils

Gerber Source: Derived from a separate, dedicated Adhesive layer.

Target Location: The apertures target the solder mask between the pads, directly underneath the component body. The glue must be kept entirely away from the copper to ensure it doesn't insulate the pads and ruin your electrical connections.

Keep these layer distinctions in mind when generating your manufacturing files to ensure a smooth, defect-free assembly process!