LC filters for EMI suppression

17 May 2017 Passive Components

The MEM1005PP251T is a new LC filter for EMI suppression, made by TDK.

With dimensions of just 1,0 x 0,5 x 0,35 mm it is ideally suited for use in smartphones and base stations.

The usual method for suppressing interference in the communication frequency bands of smartphones and other devices is to use capacitors or inductors, or a combination of these components. In contrast to discrete solutions, the MEM1005PP251T combines two capacitors and an inductance in the form of a Pi filter in a single component. As a result, 61% less space is required and there is a reduction in the overall number of components.

Thanks to the special design, the component offers very low-loss operation and a DC resistance of just 0,8 Ω, which represents a reduction of 69% when compared to previous products. The new filter offers a rated current of 350 mA, which is 3,5 times more than the MEM1608P series, and is designed for a very wide temperature range from -55°C to +125°C.

The attenuation in the frequency range from 700 MHz to 3 GHz, which is used by mobile communications, is in excess of 30 dB. This means that interference is well suppressed and reception sensitivity increases.

For more information contact Pieter Engelbrecht, Avnet South Africa, +27 (0)11 319 8600, [email protected], www.avnet.co.za

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