The FMNS4004 from Fairview Microwave is a Noise Source with Frequency 0.2 to 3000 MHz, Excess Noise Ratio (ENR) 51 dB, Flatness ±2 dB, Temperature Coefficient 0.01 dB/Degree C, Voltage Coefficient 0.1 dB/%V. Tags: Surface Mount. More details for FMNS4004 can be seen below.