A ring configuration provides the ultimate utilization of the intrinsic ferrite material properties. Toroidal cores are used in a wide variety of applications such as power input filters, ground-fault interrupters, common-mode filters and in pulse and broadband transformers.

• Toroids are listed by initial permeability classes and increasing dimension of the inside diameter.

• All toroidal cores are supplied burnished to break sharp edges.

• Toroids are tested for A_L values at 10 kHz. The square loop 85 material toroids are specified to a squareness ratio and not to an A_L value.

• Toroids with an outside diameter of 9.5mm (.375") or smaller can be supplied Parylene C coated. The Parylene coating will increase the "A" and "C" dimensions and decrease the "B" dimension a maximum of 0.038mm (.0015"). The ninth digit of a Parylene coated toroid part number is a "1". Click to see the material characteristics of Parylene C. Parylene C coating is RoHS compliant.

• Toroids with an outside diameter of 9.5mm (.375") or larger can be supplied with a uniform coating of thermo-set plastic coating. This coating will increase the "A" and "C" dimensions and decrease the "B" dimension a maximum of 0.5mm (.020"). The 9th digit of the thermo-set plastic coated toroid part number is a "2". Thermo-set plastic coating is RoHS compliant.

• Thermo-set plastic coated parts can withstand a minimum breakdown voltage of 1000 Vrms, uniformly applied across the "C" dimension of the toroid.

• The “C” dimension may be modified to suit specific applications.

• For any toroidal core requirement not listed in the catalog, please contact our customer service department for availability and pricing.

• Explaination of Part Numbers: Digits 1&2 = product class, 3&4 = material grade, 9th digit 1 = Parylene coating, 2 = thermo-set plastic coating.