Surface-Mount C & Pi Filters: SBSM, SBSP & SBSG Syfer / Knowles Surface-Mount C and Pi Filters: SBSM, SBSP, and SBSG are surface-mount EMI filters that offer X7R and C0G dielectrics as well as EMI filtering performance up to 1GHz and higher. The SBSP series has a 1A rated current, the SBSG series has a 5A rated current, and the SBSM series has a 10A rated current. These filters are ideal for telecom, power supplies, industrial equipment, and aerospace applications.