Bus lines contain many lines that switch on and off simultaneously. Especially on data and address bus lines, an instantaneous large current flows into the GND and power supply lines. Therefore, it is necessary to suppress the current flow on the signal lines. The BLM Series (Chip Ferrite Bead) is generally used for this purpose.

On the control bus line, especially at high operating speeds and high noise levels, a filter with resistance components is used, such as the NFR21G Series (Chip "EMIFIL®").