ACM-21U-900-T is a wire wound common mode choke designed for USB 3.0 applications, featuring a compact 2.0 x 1.2 x 1.2 mm form factor with small size and low profile construction. The device provides 90 O common mode impedance at 100 MHz with a maximum DC resistance of 0.40 O and rated voltage of 20 Vdc, while maintaining virtually no effect on high-speed differential signals through suppressed differential mode impedance. It operates reliably across -40°C to +105°C and features an insulation resistance of 10 MO minimum, with a rated current of 280 mA. This component is ideal for eliminating common mode noise in high-speed differential mode signal transmission lines such as USB 3.0, making it essential for high-speed data communication systems requiring noise suppression without signal degradation.