DLW21SN900SQ2L

DLW21SN900SQ2L is a wire-wound common-mode choke from Murata in a 2012 case (2.0 x 1.2 x 1.2 mm), with common-mode impedance of 90 Ω ±25% at 100 MHz, and Murata's PIM record lists this part as In Production. The rest of the record: rated current 330 mA, rated voltage 50 V DC, withstanding voltage 125 V DC, DC resistance 0.35 Ω maximum, insulation resistance 10 MΩ minimum, operating range −40 °C to +85 °C. The final L is the 180 mm embossed-tape reel at 2,000 pieces. The selection point is a two-line choke in the 0805-class footprint for USB and low-speed differential pairs — the impedance sits at 100 MHz, where the common-mode noise on those lines lives. Selection advice: common-mode impedance is not differential loss; check Murata's mode-separated curves so the signal pair you protect is not the thing you attenuate.