The CSTLS4M00G56-A0 is a surface-mount 4mm x 4mm x 0.85mm-high ceramic low-pass filter made by Murata. It has an insertion loss of 14.3 dB at 3 GHz and 69 dB of attenuation at 5.5 GHz and allows a low-pass cutoff frequency of 4GHz. The part operates in the 0.5 to 5.5 GHz frequency range with a passband of 30 to 4 GHz, great for high-volume designs. This low-pass filter has an input-rejection ratio of >40 dB, so RF signals, such as cellular signals, do not interfere with signals sent from other sources. Murata’s CSTLS4M00G56-A0 is RoHS compliant and halogen-free, making it suitable for use in automotive and telecommunication applications.