PCB Manufacturing Tolerances


PCB manufacturing tolerances
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Last updated on September 2nd, 2022 at 01:57 pm

PCB Manufacturing tolerance is critical factors to consider in the manufacturing process. If these aren’t met, your final product could be delayed. PCB design tolerances vary by PCB manufacturing facility, which can affect a number of factors including stack up and target impedance. Knowing these factors will help you avoid costly delays. Below are a few examples of PCB manufacturing tolerances. If you have questions, check out our FAQs.

IPC-6012 Conductor Width and Thickness

The IPC-6012 conductor width and thickness standards require that the conductors’ plated holes have clearances of at least 0.010″ from the pad’s edge. This is to ensure that the IPC-6012 annular ring is intact. The soldermask clearances should also be 0.03″ greater than the pad’s edge to prevent swelling, which is sometimes referred to as “soldermask swell.” If the two pads are within 0.010″ of each other, special processing is required.

Maximum thickness rating for PCBs

The thickness of a PCB is important, as it affects its performance and is a critical element for the overall design. To get the best performance, it should be the perfect thickness for the use. Here is some information on the various PCB thickness standards and their implications. A PCB’s maximum thickness rating is defined by the type of application. The maximum thickness for a PCB is typically between 0.020″ and 0.270″ thick.

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Drill depth tolerances for vias

PCB manufacturers need to consider the drill depth tolerances for vias in order to manufacture accurate printed circuit boards. The depth of the holes is governed by the barrel plating class and the aspect ratio, which is an important design parameter. For example, the maximum drill depth for thin-walled copper vias is 10:1; however, for multi-layered boards, the maximum drill depth is one layer.

Warping of the PCB during the depressing process

The depressing process is one of the most critical steps in the manufacturing process. However, it also introduces a risk of PCB warping during the soldering process. Warped PCBs can create a problem during the soldering process since the warped areas increase the stress and heat during the joining process. Fortunately, there are ways to avoid PCB warping before it begins.

Communication of PCB manufacturing tolerances

PCB manufacturing tolerances are an important part of the manufacturing process, and can determine a PCB’s performance. However, most manufacturers have no idea how to determine the appropriate tolerances for their products. Fortunately, Rigiflex engineers have a few suggestions for designers and manufacturers. They recommend using mid-range tolerances and sourcing boards to fit the design. However, it’s important to remember that using very strict tolerances can increase manufacturing and assembly time and costs.


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