Will the high humidity environment at the edge of the box affect the performance of the filtering devices?

In high-humidity environments, moisture adsorbs onto the PCB surface and components of edge computing boxes, leading to a decrease in insulation resistance. MLCC filter capacitors may experience increased leakage current due to moisture absorption, resulting in a lower ESR and resonant frequency. While the DCR of ferrite beads may change slightly, the permeability and inductance of common-mode inductors decrease after moisture absorption, severely impacting filtering performance. Countermeasures include:

1. Applying a 50-100μm thick layer of conformal coating to the entire board to block moisture.

2. Selecting moisture-resistant components, such as potted common-mode inductors.

3. Adding moisture-proof covers to key filters.

4. Coating Y capacitors and TVS leads with protective adhesive.

Entech's automotive-grade components undergo a 1000-hour dual 85°C humidity test with parameter changes of less than 5%. For outdoor applications of edge computing boxes, a wide-temperature, moisture-resistant series is recommended.