New chip ferrite beads are first to achieve 20A rating

Murata has launched the BLE32SN series of chip ferrite beads. These are claimed to be the world's first chip-type noise suppression components to have 20A current rating. They will be employed to offer noise suppression in circuits with large current flows, such as the battery charging systems and powertrains of EVs, as well as in industrial equipment.

Previously, no chip-type noise suppression filter could achieve a 20A current rating. This meant multiple chips had to be mounted in parallel, adding to the BoM costs and taking up valuable board real estate. By specifying the new series, a small number of chips will be required - allowing space savings and weight reductions.

By using advanced structural simulation techniques, the company's engineers have been successful in developing a proprietary internal electrode design. This improves the electrode volume of these chips compared with those employing a conventional arrangement. It has resulted in a notable lowering of their DC resistance characteristics. Consequently, heat generation is lowered, so less thermal management is required - enabling further cost and weight savings to be benefitted from.

This series ferrite beads have a compact form factor, with 3.2mm x 2.5mm x 2mm dimensions. They can support an operational temperature range of -55C to +125C or -55C to +150C, depending on customers' application needs.