Carbonyl/Sponge Powdered Iron

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Used as a core material in RF circuits requiring high Q inductors from 50kHz to 500 MHz and broadband transformers above 50 MHz. Also available loaded into a rigid, resin matrix for use as a microwave absorber in coax or waveguide loads, attenuators, chokes and other dissipative elements for use from 100 kHz to over 40 GHz.

Property (Symbol) unit	Initial Permeability (u_i)	Temp. Stability (-55 to +125C) ppm/C	Particle Size µm	Density (D) g/cc	Recommended Frequency (f) MHz	Features
3120	8.5	35	1-3	5.0	10-200	carbonyl iron, higher Q at hi freq. (vs. 3118), high cost
3118	9	30	2-4	5.0	1-60	carbonyl iron, higher Q at hi freq. (vs. 3976), high cost
3976	10	95	3-5	5.0	0.1-40	carbonyl iron, high Q, most widely used, moderate cost
3900	20	280	7-9	6.5	0.05-10	reduced carbonyl iron, high Q, < 1 MHz, high permeability, high cost
3908	35	255	5-7	6.5	0.05-2	reduced carbonyl iron, medium Q, high permeability, high cost
3866	60	950	11-13	6.1	0.06-50	annealed sponge iron, high permeability, low Q, low cost

National Magnetics Group, Inc. National Magnetics Group, Inc.

Carbonyl/Sponge Powdered Iron

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