Factors Influencing Your PCB Thickness Decision
2. Crunching the Numbers
Okay, so we know PCB thickness matters. But how do you actually choose the right one? Don’t worry, it’s not rocket science (although, it could be for some applications!). Several factors come into play, and understanding them is key to making an informed decision. Lets get to it!
First off, application. What’s this PCB going to be used for? A tiny wearable device needs a much thinner board than, say, a high-power amplifier. Consider the physical constraints of your product enclosure. A thick PCB might simply not fit in a compact design. For example, a simple LED circuit can use a thinner PCB thickness. Meanwhile something more serious like a medical device or something for the military needs to be more robust!
Next, layer count. More layers usually mean a thicker board. Think about it: you’re stacking more material on top of each other. Standard PCBs often have 2 or 4 layers, while more complex designs can have 8, 16, or even more. Higher layer counts are common in high-density designs where space is at a premium and complex routing is required.
Third, copper weight. This refers to the thickness of the copper traces on your PCB. Heavier copper (i.e., thicker copper) is needed for higher current applications. And guess what? Heavier copper often requires a thicker PCB to provide adequate support and prevent warping during manufacturing. Warping is a big no-no because it can lead to component placement issues and soldering problems, which is a hassle to resolve!