Analysis of common failure causes of PCB circuit boards caused by moisture

by:A-TECH      2021-03-21
Whether the PCB circuit board is in production or storage, it is necessary to avoid circuit board failures caused by moisture. The following is the analysis of common failure causes of PCB circuit boards caused by humidity: circuit boards used in humid environments, because the air contains relatively large humidity, when the humidity is too large, they will turn into water droplets and fall onto the circuit board. After falling on the circuit board, the water droplets spread out on the circuit board, and will adhere to each pin or printed line of the electronic component. Since the electronic components currently used in the circuit board are all SOP or SSOP SMD components, when moisture is converted into water drops on the pins of the SSOP package integrated circuit, if the circuit board is in operation at this time, it will give the integrated circuit An invisible resistance is added between the pins, causing the circuit board in working condition to malfunction. If the moisture is converted into water droplets and drops between the pins of the electronic components on the circuit board, if the circuit board is just in a non-working or power-off state, it will not immediately cause harm to the circuit board, but the pins of the electronic components may After the printed lines are infiltrated by water droplets, the pins of the components will be rusted, and after a long time, the feet will be broken due to the corrosion and cause circuit board failure; after the printed lines are infiltrated by water droplets for a period of time, printed lines will appear When the circuit board is turned off, the circuit board cannot be operated when it is put into work. The above is the analysis of common failure causes of PCB circuit boards caused by humidity. Friends can formulate relevant measures based on these reasons to reduce or avoid circuit board failures in electronic equipment due to humidity.
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