What are the effects of moisture on chip resistors and capacitors?

bluefox0919

What are the effects of moisture on chip resistors and capacitors? [Copy link]

The current situation is that the original circuit boards are all coated with moisture-proof paint. But I don't know why a batch was shipped without being coated. I would like to ask if the resistors and capacitors are exposed to moisture, in addition to the change in resistance value, will the capacitance value also change? I don't consider the circuit design, I only consider the results of the materials, thank you.

懒猫爱飞

There will definitely be changes

chunyang

The main impact of moisture is not on the capacitance and resistance values. As long as the product is qualified, there will be no obvious impact. You can refer to the device manual for details. The problem lies in the PCB, especially when there is dust or other adsorbent dirt and then moisture, which will significantly reduce the insulation. In other words, there will be many unpredictable "loops" on the PCB, and these loops will certainly change the circuit characteristics. As for whether it will affect the normal operation of the circuit, it depends on the specific circuit and the degree of moisture.

kiki110

Poor welding

kevinyang

What to buy affects

abbiy

Influencing parameters

bluefox0919

chunyang posted on 2018-8-14 13:55 The main impact of moisture is not on the capacitance and resistance values. As long as the product is qualified, there will be no obvious impact. You can refer to the device manual for details. The problem is...

Generally speaking, the quality of the manufacturer determines the parameters of the device. However, external factors can also affect the unpainted circuit.

qwqwqw2088

When used in a humid environment, the components will definitely change. In fact, it is anti-corrosion. The resistor legs are oxidized. Generally, the circuit board is coated with three-proof paint.

采样电阻

Resistors are prone to moisture, so you can use moisture-proof resistors and anti-sulfurization resistors. We recommend Jebsen resistors.