CD30D22HF Unshielded Telecom Power Inductors Sumida CD30D22HF Unshielded Telecom Power Inductors are magnetically unshielded and feature a ferrite drum core construction. These inductors have a moisture sensitivity level of 1 and an operating temperature range of -40°C to +125°C (including the coil's self temperature rise). Sumida CD30D22HF Unshielded Telecom Power Inductors are ideal as a DC-DC converter inductor for mobile phones, PDAs, MP3 players, digital still and video camera (DSC/DVC), and portable media players.