Stencil for quick turn pcb prototype

1. Stencil for Quick Turn PCB Prototype
Wonderful PCB®, the leading printed circuit board (PCB) prototype
manufacturer, has enhanced their services by offering SMT stencils
when placing an order within their quick turn and high quality
product lines. Stencils join a growing suite of PCB solutions that
includes Bundled Assembly, PCB Design Software and Free DFM.
With the new stencils addition, Wonderful PCB is continuing to
distinguish themselves as a comprehensive PCB manufacturer and
provider from other providers in the marketplace.
Stencils are used for even deposition of solder paste onto a bare
circuit board. Using the stencil, you deposit solder paste (a mix of
microscopic solder balls and flux) onto all of your pads with one
swipe of a squeegee. When paste the solder, need to spread ample
amount of solder paste across the entire upper length of the stencil.
The angle of your squeegee is important when swiping solder paste
over your laser cut stencil. Next, place all of your components on
your board. When placing your components, it is usually helpful to
give a very slight tap onto the freshly solder pasted pads to help
hold them in place before heating in toaster oven. You do not even
have to get it perfect, as the surface tension of the molten solder
will pull your components into alignment (if you designed your

2. footprints correctly!). Next, heat the board until the solder paste
melts (reflows) using a heat gun, a toaster, or an oven. Since you
never directly contact a component with a hot soldering iron tip,
there is less chance of damage to the component.
With the new availability of stencils, Wonderful PCB will experience
numerous benefits. All stencils feature the following:
1. Permanent, non-removable, and non-fading fiducials
2. Exclusive performance enhancing stencil design modifications,
tailored specifically for each customer
3. Time Savings (eliminates scheduling and documentation
downtime
4. 100% laser cut, ensuring the finest quality finish
5. All fixed frame stencils are double bonded to withstand extreme
wear
6. Plates available with safety features to protect against sharp
plate edges

3. By using the new addition of the stencils product line, Wonderful
PCB has greater confidence in the high quality SMT PCBA
production! More and more customers are satisfied with Wonderful
PCB SMT production line. Of course, your order for PCBA is always
welcomed in Wonderful PCB.
Here we provide some FAQ for your learning:
Q: Why would I need a PCB stencil?
A: The PCB stencil thickness is determined by the smallest
component land pattern. Stencils replace hand soldering of surface
mount devices, and the inconsistencies created by hand soldering.
Q: What are home base apertures and why would I need them?
A: Home base apertures are used to control solder balling and
tomb-stoning of chip components.
Q: What are Trapezoidal Apertures and why would I need them?
A: Trapezoidal Apertures are created by distorting the beam on the
laser, creating a draft in the aperture wall. Trapezoidal Apertures
are effective if you plan on a long dwell time between printing of
solder paste and placement of components. The taper in the

4. aperture wall causes the paste to sit on top of itself, rather than
sliding out the sides.
Miss Albee Deng
Wonderful PCB Limited
NO.32A,Building NO.1, XianDaiChengHuaTing,ChuangYeRoad|NanShan District,ShenZhen City 518054|
China T +86-755-86229518-642 |Email ： wonderful22@wonderfulpcb.com | Website
http://www.wonderfulpcb.com
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