Will EMC filtering components fail in low-temperature environments at the edge box?

Edge computing boxes may experience filter failure at temperatures as low as -40°C. The capacitance of MLCC X7R capacitors drops to below 80% of room temperature, leading to a decrease in filter cutoff frequency shift and suppression capability. The impedance of PBZ1608E600Z0T ferrite beads increases with decreasing temperature; at -40°C, the impedance increases by approximately 20%, which, while beneficial for filtering, may cause DC-DC oscillation. The inductance of CML4532A-101T common-mode inductors remains relatively stable at low temperatures due to the low temperature coefficient of the NiZn core material. Countermeasures include:

1) using X7R or COG capacitors with sufficient tolerance;

2) avoiding excessively high DCR (Displacement Chromatography) in ferrite beads, which can cause difficulties in low-temperature startup;

3) conducting full-function low-temperature testing of critical circuits such as clock power supplies.

The CMLA4532A-101T automotive series from EAST Electronics has passed AEC-Q200 testing (-55°C-150°C) and boasts high reliability, recommended for wide-temperature edge computing boxes.