CMS3-1-R is a surface-mount common-mode inductor designed for EMI filtering in DC-DC brick power supplies, discrete output supplies, and point-of-use power supplies. It features an inductance of 28 µH (minimum) with a maximum RMS current rating of 5.70 Amperes and a typical DC resistance of 0.005 O at 20°C for both winding pairs. The device provides 300 Vdc isolation (winding-to-winding hipot rating) with a 1:1 turns ratio and operates reliably across a temperature range of -40°C to +160°C. With ferrite core construction, UL94V-0 flammability compliance, and leakage inductance of 0.31 µH, the CMS3-1-R delivers effective noise attenuation up to 44 dB across frequencies up to 100 MHz, making it ideal for high-frequency EMI suppression in compact power conversion systems.