Bobbins are an economical and well-proven core design for many applications where relatively low but stable inductance values are required.

• For higher frequency designs, use small bobbins in 43 material.

• For power applications, bobbins in 77 material are specified for AL and dc bias limits.

• Bobbins in Figures 2-5 can be supplied with a uniform coating of thermo-set plastic coating which can withstand a minimum breakdown of 500Vrms. This coating will change the dimensions a maximum of 0.5mm (.020"). The last digit of the thermo-set plastic coated part is an "8". Bobbins in Figure 5 can be supplied with notches at one end only. This changes the last digit of the part number to a "7". Bobbins of this type can also be provided with a themo-set plastic coating. The last digit becomes a "6".

• The listed dimensions are for assembled bobbins without thermo-set plastic.

• Bobbins are tested for A_L value at 1kHz < 10 gauss.

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

• Explanation of Part Numbers: Digits 1&2 = product class, 3&4 = material grade, last digit 6 or 8 = coated bobbin, last digit 7 = product modifier.