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Amidon Ferrite
Core Materials

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Material: 43 61 63 67 68 72 75 77 F J
Initial Perm. 850 125 40 40 20 2000 5000 2000 3000 5000
Max Perm. 3000 450 125 125 40 3500 8000 6000 4300 9500
Attenuate RF Noise 20-60 200-1000 500-2000 3500-1500 1000-5000 1-50 0.5-20 1-50 1-50 0.5-20
The Attenuate RF Noise row above is indicated in MHz.

MATERIAL 43 ( = 850) High volume resistivity. For medium frequency inductors and wideband transformers up to 50 MHz. Optimum frequency attenuation from 40 to 400 MHz. Available in toroidal cores, shield beads, multi-aperture cores and special shapes for RFI suppression.

MATERIAL 61 ( = 125 ) Offers moderate temperature stability and high 'Q' for frequencies 0.2 to 15 MHz . Useful for wide band transformers to 200 MHz and frequency attenuation above 200 MHz. Available in toroids, rods, bobbins and multi-aperture cores.

MATERIAL 63 ( = 40) For high 'Q' inductors in the 15 to 25 MHz frequency range. Available in toroidal form only.

MATERIAL 64 (= 250) Primarily a bead material having high volume resistivity. Excellent temperature stability and very goodshielding properties above 400 MHz.

MATERlAL 67 (= 40 ) Similar to the 63 material. Has greater saturation flux density and very good temperature stability. For high 'Q' inductors, (10 to 80 Mhz ). Wideband transformers to 200 MHz. Toroids only.

MATERIAL 68 ( = 20) High volume resistivity and excellent temperature stability. For high Q' resonant circuits 80 to 180 MHz. For high frequency inductors. Toroids only. (Material 68 has been discontinued, please refer to Material 61 or Material 67).

MATERIAL 73 ( = 2500) Primarily a ferrite bead material. Has good attenuation properties from 1 through 50 MHz. Available in beads and some broadband multi-aperture cores.

MATERIAL 77 ( = 2000) Has high saturation flux density at high temperature. Low core loss in the 1 kHz to 1 MHz range. For low level power conversion and wide band transformers. Extensively used for frequency attenuation from 0.5 to 50 MHz. Available in toroids, pot cores, E-cores, beads, broadband balun cores and sleeves. An upgrade of the former 72 material. The 72 material is still available in some sizes, but the 77 material should be used in all new design.

MATERIAL 'F' ( = 3000) High saturation flux density at high temperature. For power conversion transformers. Good frequency attenuation 0.5 to 50 MHz. Toroids only.

MATERIAL ' J '/75 ( = 5000 ) Low volume resistivity and low core loss from 1 kHz to 1MHz. Used for pulse transformers and low level wide band transformers. Excellent frequency attenuation from 0.5 to 20 MHz.

MATERIAL K (= 290 ). Used primarily in transmission line transformers from 1 to 50 MHz range. In toroidal form only.

MATERIAL W ( = 10,000). High permeability material used for frequency attenuation from 100 kHz to 1 MHz in EMI/RFI filters. Also used in broadband transformers.

MATERIAL H ( = 15,000). High h permeability material used for frequency attenuation under 200 kHz. Also used in broadband transformers. Available in toroidal form only.


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