Lead inductance of ferromagnetic materials and a method to reduce inductance at low frequencies

Author

Huang, C.C.

Author_Institution

VLSI Technol. Inc., San Jose, CA, USA

fYear

1990

fDate

20-23 May 1990

Firstpage

1109

Abstract

Data on the inductance of Alloy 42 and Kovar and its relationship to frequency are presented. The domain theory is applied to explain the relaxation phenomena of ferromagnetic materials vs. ferrites. The measured inductance of ferromagnetic materials and copper strips is compared with theoretical calculations. Also, a method of reducing the inductance of ferromagnetic materials at low frequencies is discussed. A transition state between 1 and 10 MHz in Alloy 42 and Kovar is found. Non-ferromagnetic materials (copper, solder, gold, silver, etc.) can be plated over the entire ferromagnetic material to reduce the inductance at low and high frequency. It is shown that there is no way to find the quantitative value of magnetic permeability of ferromagnetic material by measuring the inductance and employing the analytical formula at low-current (mA) and low-voltage (mV) conditions

Keywords

ferromagnetic properties of substances; ferromagnetic relaxation; inductance measurement; magnetic domains; packaging; 1 to 10 MHz; Alloy 42; FNi; FeNiCo; Kovar; domain theory; ferromagnetic materials; inductance; lead inductance; low-current conditions; low-voltage conditions; magnetic permeability; quantitative value; relaxation phenomena; transition state; Copper; Ferrites; Frequency; Gold; Inductance measurement; Lead; Magnetic materials; Permeability; Silver; Strips;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronic Components and Technology Conference, 1990. ., 40th

Conference_Location

Las Vegas, NV

Type

conf

DOI

10.1109/ECTC.1990.122323

Filename

122323