NFZ Chip Noise Filters Murata Electronics NFZ Chip Noise Filters are designed for noise suppression of audio lines such as Class D amplifiers. These NFZ noise filters can suppress noise in the range of 700MHz up to 2GHz without distorting the audio waveform. The series features low DC resistance, a rated DC current range of 180mA to 305mA, and excellent solder heat resistance. Murata Electronics NFZ Chip Noise Filters operate in a temperature range of -55°C to +125°C. The exceptional solder heat resistance is made possible by the nickel barrier structure of the external electrodes.