Chip filters offer better suppression to 1 GHz

12 July 2006 Circuit & System Protection

The increasing operating speeds of ICs in DVD recorders, digital cameras and flat-screen televisions, etc, progressively demand improved EMI filtering.

To match this demand, Murata has enhanced the performance of its existing filters, improving noise suppression between 100 MHz and 1 GHz by 10 dB to over 50 dB, with no size increase.

In the new NFM18PS three-terminal capacitors, optimised electrode structures reduce ESL. At the same time radiated noise is further suppressed, the two improvements increasing noise suppression over a wider frequency range than existing designs. Voltage variation is also suppressed so that this development is ideal for the DC power lines of ICs working at the top of the speed range.

The 0603 chip style filter can be reflow-soldered at up to 260°C using Pb-free solder, preferably Sn-Ag-Cu. Packaging is in 8 mm paper tape containing 4000 for high-speed automatic processing.

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