What Makes Thickness a Crucial Parameter in Standard PCBs?

Standard PCBs are the PCBs designed and assembled according to general or standard application requirements. However, these standardized parameters may not mean just one value per parameter, rather it offers a range of frequently-preferred sizes and specifications for PCB manufacturing. The standard PCBs can be manufactured using different materials like aluminum, fiberglass, epoxies, etc. However, the standard parameters like thickness, number of layers, etc remain in compliance with the industry approved values. Out of all the parameters, the thickness is one parameter that is considered crucial for several reasons. This post discusses why thickness is a crucial parameter of standard PCBs and what an otherwise impact is.

Standard Thickness of Standard PCBs

Several contract manufacturers (CMs) of PCBs consider approx. 0.062inches i.e.; 1.57mm as the standard thickness for PCBs. Nowadays, with the advancement in technologies and increase in demand for small-sized and mid-sized PCBs, the PCB thicknesses like 0.031inches (0.78mm), 0.062inches (1.57mm), and 0.093inches (2.36mm) have gained popularity. These three sizes are standard thicknesses for most standard PCBs in modern electronics.

Importance of Standard Thickness

It is obvious to be curious about why the standard thickness is so important. The answer to this question lies in the following points.

  • The thickness of a PCB is responsible for the overall functionality and operation of mounted components. The thickness itself is not a single consideration, it includes thickness of a substrate layer, mounted components, and mapping. Therefore, if multiple layers are involved in the design, the integrated thickness of all layers must compensate for a standard thickness so that the mounted components and wires do not suffer impedance.
  • The thickness is also responsible for the introduction of conductivity and resistance during the operation of the PCB. Due to certain reasons, the thickness is considered a crucial parameter. However, had not the thickness been maintained, the following effects are seen.
  • Incorrect thickness leads to an increase in resistance or conductivity, which impacts the performance and sustainability of the PCB.
  • Incorrect thickness may result in additional impedance. The impedance is controlled by a layer of a dielectric, which is a part of the overall PCB thickness. Additional impedance can cause electrical short circuits in the wiring.

Now that the importance and impact of standard thickness in standard PCBs, it is also important to know the factors that may impact standard thickness.

Factors that Impact on Standard PCB Thickness

The factors that may impact the standard PCB thickness are listed below.

  • Copper Thickness
  • Number of Layers
  • Board Material
  • Operating Conditions
  • Depanelization Methods

These factors must be precisely calculated in order to maintain the standard thickness of the standard PCBs.

Acknowledging the importance of standard PCB thickness, this part is handled by experts during every PCB design process. To avoid manufacturing defects, it is important that you source standard PCB manufacturing services from experienced manufacturers like Rigiflex Technology, Inc. The company has been offering end-to-end PCB assembly services for over 20 years. Their long term market presence, quality production, and experienced staff make them an ideal manufacturer of standard and custom PCBs.