EMI filtering for the LIN bus is highly recommended and should be done to mitigate any EMI issues (from or into the transceiver) as well as help with transient pulses and ESD strikes. In addition to the LIN messages themselves radiating noise with rising and falling edges as well as asymmetrical waveforms, noise from the rest of the vehicle can penetrate the LIN bus. This can be done through cabling, the GND, or the battery line itself. The battery line is an especially nasty culprit of noise, since it is connected to every other system in the vehicle, though isolation and heavy filtering from other ECUs help with this.

The bare minimum bus filtering consists of a shunt capacitor at the commander and each responder node. Careful consideration must be taken as to not overload the capacitance on the bus, as this slows down the edges too much and corrupts the interpretation of bits on the bus. Typical values for bus capacitance are 220 pF at the responder nodes, and up to ten times that value at the commander node. Other methods used are inductors in line with the bus, ferrite beads, and inductor-capacitor-inductor T-filters. Ferrite beads and T-filters tend to be a little more expensive, so inductors are more standard practice. This creates an LC filter along the bus, which is a suitable low-cost suppression technique.