Used in solder paste applications, our multi-use stainless steel stencils provide absolute quality and precision. The current and most widely used technology for soldering components onto a Printed Circuit Board (PCB) is Surface Mount Technology (SMT).
While older soldering method of pin through-hole soldering use liquid solder, SMT use a physical paste form of solder then melt this paste in a heated oven to form the solder joint.
SMT method provides several advantages over liquid-solder method: reduced time of production; increased production capacity; increased density of components that can be mounted onto a PCB; reducing needed design surface area of a PCB to produce a more compact product.
The sole purpose of an SMT stencil is to transfer solder paste to a bare circuit board.A well designed stencil can help to prevent 60% to 70% of SMT solder defects through the soldering process. The three commonly-occurring stencil printing defects include the following: misaligned print; erroneous stencil printing due to improper printing parameters; misalignment between PCB fiducials vs. stencil fiducials.
The fabrication of a stencil starts when a stainless steel foil is laser cut to create an opening for every surface mount device on the board, using the design Gerber files for the PCB project. 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.
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.
At PCB International, we offer many different stencil ordering options; some of which are listed below:
|Hand Stencil||$99||Single component rework stencil, bent up on two sides for handling|
|Prototype Stencil||$99||Prototype stencil (up to 10” x 12”), squeegee, and board holder|
|Oversized Prototype Stencil||$139||Prototype stencil (exceeding 10” x 12”), squeegee, and board holder.|
|Basic Proto Stencil Kit||$99||Basic Prototype Stencil Kit (up to 10" x 12"), Stencil, squeegee, and board holder.|
|Prototype Stencil Kit-Leaded||$159||Prototype stencil (up to 10” x 12”), leaded solder paste, pick & place tool, temperature marker (331° thru 379°), 1 pair of gloves, and 2 alcohol wipes.|
|Oversized Prototype Stencil Kit-Leaded||$179||Prototype stencil (exceeding 10” x 12”), leaded solder paste, pick & place tool, temperature marker (331° thru 379°), 1 pair of gloves, and 2 alcohol wipes|
|Prototype Stencil Kit-Lead Free||$149||Prototype stencil (up to 10” x 12”), lead free solder paste, pick & place tool, temperature marker (390° thru 450°), 1 pair of gloves, and 2 alcohol wipes.|
|Oversized Prototype Stencil Kit-Lead Free||$179||Prototype stencil (exceeding 10” x 12”), lead free solder paste, pick & place tool, temperature marker (390° thru 450°), 1 pair of gloves, and 2 alcohol wipes.|
|Prototype Flat Foil||$99||Flat foil used for hand printing|
|Frameless Stencil for Universal Frame||$149||Frameless stencil to fit an interchangeable plate system. Includes SMT, PRO 2, QTS, SPR|
|Frameless Stencil for Zelflex Protect 22.5 x 22.5||$199||Frameless stencil for use in a Zelflex Protect Frame|
|8 x 10 Cast Framed Stencil||$199||Cast Aluminum 8 x 10 framed stencil|
|12 x 12 Cast Framed Stencil||$199||Cast Aluminum 12 x 12 framed stencil|
|12 x 17 Cast Framed Stencil||$219||Cast Aluminum 12 x 17 framed stencil|
|15 x 15 Cast Framed Stencil||$219||Cast Aluminum 15 x 15 framed stencil|
|20 x 20 Cast Framed Stencil||$249||Cast or Extruded 20 x 20 framed stencil|
|29 x 29 Cast Framed Stencil||$269||Extruded Aluminum 29 x 29 framed stencil|
|29 x 29 Low Profile Framed Stencil||$269||Low Profile (1/2” thick frame) 29 x 29 framed stencil|
|20 x 20 Extruded Framed Stencil||$249||Extruded Frame 20 x 20 Stencil|
|23 x 23 Extruded Framed Stencil||$259||Extruded Frame 23 x 23 Stencil|
|23 x 25 Extruded Framed Stencil||$259||Extruded Frame 23 x 25 Stencil|
|29 x 29 Extruded Framed Stencil||$269||Extruded Frame 29 x 29 Stencil|
|SPR Plate (16" x 19" APS20)||$150||SPR Plate (16" x 19" APS20)|
|Fuji4000 Framed Stencil||$299||Extruded Aluminum Frame for Fuji 4000|
|Pick and Place Tool||$35||Pick and Place Hand Tool|
|Solder Paste Only-Lead Free 12 grams||$31||Lead Free RoHS solder paste - ZeroLead No-Clean Solder Paste 12 grams in a 10cc syringe. Part# ZLSP-10cc|
|Solder Paste Only-Leaded 12 grams||$29||Leaded solder paste - ZephPaste Eutectic Solder Paste SPE-0012 - No-Clean 63Sn/37Pb Solder Paste 12 grams in a 10cc syringe.|
|QTS 20 x 20 Universal Frame||$1,650||QTS 20 x 20 Universal Frame|
|Pro 2 20 x 20 Universal Frame||$890||Pro 2 20 x 20 Universal Frame|
|SMT 20 x 20 Universal Frame||$1,450||SMT 20 x 20 Universal Frame|
|AssemblyPro Fixture||$99||Fixture for assembling double sided PCB’s. Requires a Prototype stencil for each side of the board. Fixture custom machined to order. This product has a 2 day lead time from receipt of order.|
|Metal Charge||$40||Stencil thickness less that 0.004” and over 0.008”|