Now you can add a stencil to any PCB fabrication order. Simply place your PCB order as usual, and choose from a variety of stencil types and sizes, one to fit each of your stencil requirements.
Need to order a replacement stencil for boards previously manufactured by Sunstone? No problem! Just access the board order via your account order history at any time, and order a stencil directly from your history.
See the chart below for more details on the stencils available.
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The sole purpose of an SMT stencil is to transfer solder paste to a bare circuit board. A stainless steel foil is laser cut creating an opening for every surface mount device on the board. Once the stencil is properly aligned on top of the board, solder paste is applied over the openings (making a single pass, using a metal squeegee blade). When the stainless steel foil is separated from the board, solder paste will remain, ready for placement of the SMD. This process, as opposed to hand soldering methods, ensures consistency and saves time. Want so see an example of this process with step-by-step photos?
Stainless steel foil thickness and aperture opening size control the volume of paste deposited on the board. Too much solder paste causes solder balling, bridging, and tomb-stoning. A lack of solder paste creates insufficient solder joints. All of which compromise the electrical functionality of the board.
Proper foil thickness is chosen based on the types of devices being loaded on the board. Component packages such as 0603 capacitors or 0.020” pitch SOICs, will require a thinner solder paste stencil than larger packages such as 1206 capacitors or 0.050” pitch SOICs. Solder paste stencil thickness ranges from 0.001” to 0.030”. The typical foil thickness used on the majority of boards is anywhere from 0.004” to 0.007”. Now offering nano coating on select stencils and sizes! "Nano coating” is a two part, wipe on process, made up of hydrophobic elements that repel flux and solder, resulting in improved paste release for extremely small components. The coating is applied to the contact side of the stencil prior to shipment, making the stencil ready to use right out of the box. This coating is recommended for fine pitch QFN’s, fine pitch IC’s, micro BGA’s, and 0201 component types. Need more information? Check out the Stencils FAQ page.
http://www.sunstone.com/pcb-products/pcb-solder-stencils
Current state, opening paragraph:
Sunstone Circuits is now offering stencils as part of Quickturn, Full Feature, and PCB123® orders. Simply place your PCB order as usual, and choose from a variety of stencil types and sizes, one to fit each of your stencil requirements. See the chart below for more details on the stencils available.
Desired state, opening copy:
Low profiles (1/2” thick frame) 29x29 framed stencil.
Framed Stencils or glue-in stencils are laser cut stencil foils permanently mounted in a stencil frame using a mesh border to tightly stretch the stencil foil taut in the frame. These solder paste stencils are designed for high volume screen printing on printed circuit boards. They are recommended for printed circuit board assembly when doing production runs. Our framed stencils provide optimum solder paste volume control. Framed stencils have smooth aperture walls and can be used for 16 Mil pitch and below and for Micro BGAs.
Frameless Stencils are laser cut stencils designed to work with stencil tensioning systems also known as Reusable Stencil Frames like the Universal Frame These solder paste stencils do not need to be permanently glued in a frame. Frameless Stencils are significant less expensive than Framed Stencils and reduce storage space requirements.
Frameless Stencils are designed for screen printing on printed circuit boards. They are recommended for prototype printed circuit board assembly or short runs. Our Frameless Stencils provide optimum solder paste volume control. They have smooth aperture walls and can be used for 16 Mil pitch and below and for Micro BGA's.
Prototype Stencils (standard to 10”x12”) are laser cut stencils custom-made for your own printed circuit boards using your Gerber Paste file. Comes with a squeegee blade and board holders. These frameless solder paste stencils were specially designed for manual printing. Oversized (above 10”x12”) $175
Prototype Stencils (standard 10”x12”), a squeegee blade and board holders. Plus the stencil kit comes with Leaded or Lead Free solder paste, pick & place tool, temperature marker (331-379 degrees), 1 pair of gloves and 2 alcohol wipes.
Rework Stencils are laser cut stencils typically used to manually print a single component on a printed circuit board. They are mainly used for PCB rework but can used for prototype PCB assembly of simple boards. The flaps are for the purpose of holding the stencil between the thumb and finger.
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