Smallest wire-wound chip inductors for signal line filters claimed

22 February 2006 Passive Components

Taiyo Yuden says that its new LBM2016 series of wire-wound chip inductors are now being mass produced at the rate of three million units per month, expecting to reach 10 m units by mid-year.

The EIA0806 case size (2,0 x 1,6 x 1,6 mm; L x W x H) LBM2016 is 43% smaller by volume than equivalent-rated inductors typically used for signal line filter applications in standard TVs, audio equipment, set-top boxes, AV equipment and other devices that require large numbers of signal lines and corresponding inductors, it says.

Signal line circuits incorporating an inductor and capacitor are used to isolate specific signal frequencies, a critical operational requirement of all modern electronics. This application requires inductors with a higher Q factor and narrower inductance tolerance than the type of power inductors typically used in DC-DC converter choke coils and IC input power circuits. However, adapting this same technology to LBM2016 series signal line inductors enabled Taiyo Yuden to significantly reduce chip size while retaining the high Q factor and narrow inductance tolerance of previous signal line inductors.

Further refinements included optimising the material compound ratios of the outer covering, redesigning the ferrite core, thickness and number of windings to eliminate all wasted space and optimise performance.

The LBM2016 series non-polarised electrodes also simplify manufacturability by allowing the device to be mounted, right side up, regardless of orientation. A total of 25 different part numbers are currently offered in the LBM2016 series.

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