Magnetic sheet represses noise

TDK has released a magnetic sheet, the Flexield IRJ17, for noise suppressing applications.

It achieves magnetic permeability1 at the industry's highest levels, and excellent fire resistance.

A flexible sheet of Flexield IRJ17 as thin as 0.1mm can absorb noise at frequencies between 5MHz and 3GHz.

The product's ultra-high magnetic permeability means that more unwanted radiation can be blocked with less material, providing more effective noise suppression in space-constrained applications such as mobile phones.

Flexield magnetic sheets combine soft magnetic and polymer materials, and employ a magnetic powder created using powder composition and formation methods.

As a result of these developments, IRJ17 magnetic sheets exhibit outstanding attenuation effects on noise reflected from ICs and flexible printed circuit boards over a wide frequency range from low (above 5MHz) to high frequencies.

The noise control effects of IRJ17 magnetic sheets include high magnetic permeability (u = 180) and magnetic characteristics that are approximately 1.7 times better than those of earlier TDK products.

With regard to the fire resistance requirements of electronic components, IRJ17 magnetic sheets have obtained certification under the American UL94V-0 standard.

The Flexield IRJ17 is expected to find uses in numerous types of electronic devices, such as digital cameras and mobile phones that have become more compact and slimmer at the same time as providing more functions.

The use of magnetic sheets made of soft magnetic materials, capable of absorbing noise and converting it to thermal energy, can prevent noise from leaking outside devices and prevent harmful effects on other boards and components from internal reflection.

The IRJ17 extends TDK's range of magnetic sheets, which also includes the IRJ09 and IRJ04 products.

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