Chip Ferrite Beads Support 8.5A and 12A Lines

When it comes to chip ferrite beads for use for power line noise suppression and EMI filtering in power supplies, one major consideration for their selection is a high rated current value. Responding to that requirement, Murata Manufacturing Co., Ltd. has added chip ferrite beads that boast 8.5A and 12A ratings in the 0805 and 1206 chip sizes and are designed for use in general-purpose and automotive applications.

Chip ferrite beads are used for either signal lines or power lines. Of these two, when it comes to using the beads for power lines, the rated current value of the beads is extremely significant as an indicator that determines whether they can indeed be used. The maximum rated current value supported by conventional chip ferrite beads in the 2.0x1.2mm and 3.2x1.6mm sizes has been 6A.

By optimizing both materials and internal structure, Murata has now added chip ferrite beads with ratings of 8.5A and 12A to its line-up, thus extending the range of the products’ applications. Despite the small chip sizes of 0805 and 1206, the new chip ferrite beads successfully achieve the high rated current levels of 8.5A and 12A.

The new chip ferrite beads are offered in six part numbers: For general applications the BLM21SN300SN1 (0805 size) and BLM31SN500SN1 (1206 size); For automobile powertrain safety applications the BLM21SN300SH1 (0805 size) and BLM31SN500SH1 (1206 size); and For automotive infotainment applications the BLM21SN300SZ1 (0805 size) and BLM31SN500SZ1 (1206 size).