Tiny LC filters suppress EMI

8th March 2017

Alice Matthews

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Whitepaper

A LC filter for EMI suppression has been presented by TDK Corporation. With dimensions of 1.0x0.5x0.35mm the MEM1005PP251T filters are suited for use in smartphones and base stations. Volume production began in March 2017. The usual method for suppressing interference in the communication frequency bands of smartphones and other devices is to use capacitors or inductances, 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 by TDK, the component offers low-loss operation and a DC resistance of 0.8Ω, which represents a reduction of 69% when compared to previous products. The new filter offers a rated current of 350mA, which is 3.5 times more than the MEM1608P series. With these properties the combination element offers the highest possible performance currently available in its class, according to the company.

In addition, the new filter is designed for a temperature range from -55 to 125°C, whereas previous series only covered the range from -40 to 85°C. Due to expansion of rated current and the wide temperature range, it allows a high degree of design flexibility.

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

In future, TDK will extend this product line to meet the design requirements for a broad spectrum of devices for wireless communication.