June 2007

EMC filters

SIFI-F 2-line filters for medical applications

The new, compact 2-line filters of the SIFI-F (B84111F*M) series are now also available in a medical version. Not only do they offer all the advantages of the standard SIFI-F version, they also boast an extremely low maximum leakage current of 2 μA. With its compact dimensions, the SIFI series from EPCOS is therefore well suited for medical applications such as ultrasound devices, X-ray systems, or other medical diagnostic devices where low leakage current is a critical factor.


Despite their compact design, they offer very good suppression of symmetrical and asymmetrical interference. Applications for all three of the important approvals, namely UL, cUL and ENEC, have been submitted. The SIFI-F, along with the larger SIFI-G and SIFI-H, is designed for the climate category of up to +100 °C. Filters for all current strengths up to 36 A are available from stock as samples.

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