Ferrites and filters combine and protect

A Micromark C and CD product story

Edited by the Electronicstalk editorial team Nov 1, 2004

New ferrite beads offering high impedance in the gigahertz range address the issue of HF noise in miniature portable applications such as handsets.

New ferrite beads offering high impedance in the gigahertz range address the issue of HF noise in miniature portable applications such as handsets.

A new solution for noise suppression in digital broadcast circuitry and a high frequency SMD trimmer, have also been added to the range from Micromark C and CD.

The new 0402 ferrite bead Murata BLM15HG and BLM15HD series EMI filters from Micromark C and CD offer high impedance in the GHz frequency range to address HF noise in miniature digital circuits.

Ideal for portable systems combining such circuits with radio antenna, such as mobile phone handsets and remote monitoring equipment, the tiny filters are also suitable for EMI suppression for laptops, PDAs and other equipment where erroneous operation caused by a local oscillation signal in mobile phones is a risk.

Featuring low DC resistance and high rated current, the series is temperature rated at -55 to +125C and features Ni+Sn plating in termination.

In addition, Micromark C and CD has extended the range of values available in the compact Murata NFA21SL series of four circuit-combined LC filters to include cutoff frequencies ranging from 80 to 300MHz.

Ideal for noise suppression in LCD signal lines and digital TV and other broadcast circuits, unique materials offer extremely steep insertion loss characteristics when compared with other ceramic-based devices.

The array construction offers exceptional space savings, with dimensions as low as 2.0 x 1.25 x 0.5in for the low profile models.

The new TZW4 high voltage and high frequency SMD ceramic trimmer capacitor with top adjustment has been developed to address growing requirements for impedance matching in microwave circuits.

It features compact dimensions of 4.2 x 5.2 x 2.5mm, a high withstand voltage of 550V and an extremely high self-resonant frequency of more than 3GHz at 1.5pF.

In addition, a non-electrical contact construction, with the rotor as a middle electrode, provides high reliability and the device features high Q in VHF, UHF and microwave bands.