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

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

Whether the PCB circuit board is being manufactured or stored, it is necessary to avoid circuit board failures caused by moisture. The following is an analysis of common failure causes of PCB circuit boards caused by moisture:

Common faults of PCB circuit boards

Circuit boards used in humid environments, because the air contains relatively large humidity, when the humidity is too high, it will turn into water droplets and fall on the circuit board. After falling on the circuit board, the water droplets will spread on the circuit board., Will be attached 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 droplets 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 the working state 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 line mold will appear When the circuit board is interrupted, 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.(Circuit board factory)