Factors That Influence the Reliability of Microvias in PCBs

Influence the Reliability of Microvias in PCBs

A printed circuit board (PCB) is the heart of a high-tech electronic product. It establishes a conductive pathway through layers of insulating material sandwiched together and is plated with copper to connect all the layers. It is these connections that are the foundation of a device’s functionality and reliability. One of the primary determinants of this reliability is the size and quantity of microvias that connect layers in an HDI PCB.

When designing a PCB with microvias, there are many different factors that influence the overall reliability of these structures. For example, the type of copper fill used in the microvias pcb impacts their durability and conductivity. This is because different types of copper have different thermal properties and will react differently with the insulating material. Another important factor is the location of the microvia on the circuit board. The location will have a direct impact on whether the microvia can survive reflow, as well as its intended service life.

In addition, the way a microvia is designed impacts its manufacturing reliability. Depending on the aspect ratio and stack count of the microvia, it can be more or less likely that the copper will be successfully deposited within the hole with minimal misregistration. The amount of stress a microvia is under during assembly and usage will also impact its reliability. The higher the stress level, the more likely that the copper bond will break or erode.

Factors That Influence the Reliability of Microvias in PCBs

To mitigate these issues, the PCB fabricator needs to ensure that they can reliably plate the microvias in order to guarantee their durability and conductivity. They can do this by ensuring that the microvias are not too close to each other and that the aspect ratio is below a certain threshold. It is also recommended that the stack count of the microvias is limited to a number that is easy for them to handle, which is typically 1-2.

Finally, the type of microvias is also important as they can be either stacked or staggered. Staggered microvias look more like elevator shafts whereas stacked microvias are aligned in a sequence moving down the layers of the PCB. Both options are good choices but the stacked option is usually preferred as it is easier to fabricate and provides better stability.

Despite their many benefits, it is critical to understand the factors that impact the reliability of microvias pcb. It is not uncommon for these structures to experience failures when exposed to rigorous testing conditions. This is why it is so important to work with a trusted PCB fabricator who offers extensive quality control measures such as thorough inspection and accelerated testing. These tests will allow you to know the results of your boards and what changes need to be made before production runs. This is the only way to ensure that your microvias will be able to withstand reflow and the expected service life of your device.

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