Design PCBs for Harsh Environments
Some electronics must be able to operate reliably in harsh environments where there are temperature extremes, humidity, sand, dust, chemicals or toxic vapors. Such conditions are commonly found in the military and defence industry where PCBs need to be able to withstand vibration, shock and electromagnetic interference.
In addition, a circuit board must be able to work in the presence of a wide range of chemicals including corrosive liquids, gases, solvents and salt spray. It must also be able to cope with mechanical vibrations that can cause damage to components and the entire PCB.
The first step in designing a PCB for harsh environments is to determine the conditions it will be subjected to. This information will allow the designer to create a pcb board that will be able to resist environmental hazards and maintain its functionality in a harsh environment.
There are many ways to protect a PCB from the effects of harsh environments, but one of the most effective methods is to encapsulate the entire assembly. This means that the assembly will be placed in a material that is unable to penetrate the hazard and will also provide an electrically insulating layer. This is a good option for PCBs that are designed to withstand harsh environments, but it is not appropriate for PCBs that need to be easily serviced.
How to Design PCBs for Harsh Environments
In order to understand how a PCB is made, you must know what terms such as current maximums, signal types, impedance, and capacitance mean. These are all important factors to consider when designing a PCB for harsh environments and there are numerous resources available online that can help you understand these terms in more detail.
Another way to ensure that a PCB will be able to work in harsh environments is to use conformal coating. This is a type of film that can be applied to the surface of a circuit board and it plays an essential protective role in stopping the circuitry from being eroded by chemicals, moisture and other pollutants. It can help to significantly increase the safety factor of a circuit board and also prolong its lifespan in harsh environments.
Choosing the correct resin for a PCB can also be an important consideration when creating it for harsh environments. Depending on the severity of the harsh environment, there may be a range of temperatures that can be experienced by the circuit board and it is vital that the resin chosen has high chemical resistance in the extreme temperatures.
Using a PCB manufacturer that specializes in creating custom PCBs for harsh environments is a great way to ensure that your device will be able to withstand the harshest conditions. A company like PCBCOMING will be able to create a customized PCB solution that is designed for the specific needs of your device and will be able to withstand temperature fluctuations, moisture ingress and chemical exposure. It will also be able to incorporate design techniques that will protect the device from vibrations and shock.
