Murata offers a variety of Film and Wire Wound type common mode choke coils well suited to suppress common mode noise in applications where a good ground is unavailable.
DLP11 / 31 Series : A film type common mode choke coil series that realizes high impedance in a small size with ferrite and film processing technology.
Also available in a two component package array for high density mounting .
DLW5 / 21 / 31 Series : A wire wound type common mode choke coil series that offers high common mode impedance at high frequencies for excellent noise suppression.