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   Date: 7th Jan 2010

Murata has commercialized 0603 size chip ferrite beads

Murata said it has commercialized 0603 size chip type ferrite beads, BLM03AX, that reduce undesired noise radiation in electronic equipment.

Murata has reduced DC resistance within a component by approximately 50% by developing Murata's own new material and introducing a new process to realize the world's smallest DC resistance in the size category.

Murata has also reduced impedance variance when exposed to environmental stress such as thermal shock and high temperature load while increasing reliability over the previous model.

Chip ferrite beads are inserted into signal lines or power lines as noise suppression components. When used for power lines, DC resistance within the component results in a voltage drop. Large DC resistance causes a voltage drop reducing IC operation margin during low battery voltage. Making resistance small will limit the level of voltage drop consequently allowing the equipment to operate at lower battery voltage. Therefore, in order to lengthen battery operation time, components with small DC resistance must be made available.

BLM03AX is even smaller than the 1005 size (1.0x0.5mm) model Murata has commercialized in January 2009.

Also BLM03AX comes in a wide range of impedance lineups between 10 Ohm at 100MHz and 1,000 Ohm at100MHz at large rated currents up to 1,000mA.

BLM03AX has impedance characteristics emerging at a low frequency suitable for general signal lines and power lines

The suggested applications for the BLM03AX are Portable information equipment such as note-size PCs, netbooks and MIDs, Mobile phones, Digital still cameras, and portable audio players terminology.


Part Number Impedance @100MHz Rated Current DC Resistance
BLM03AX100SN1 10 Ohm (Typ.) 1,000mA 0.05 Ohm Max.
BLM03AX800SN1 80 Ohm ±25% 500mA 0.18 Max.
BLM03AX121SN1 120 Ohm ±25% 450mA 0.23 Max.
BLM03AX241SN1 240 Ohm ±25% 350mA 0.38 Max.
BLM03AX601SN1 600 Ohm ±25% 250mA 0.85 Max.
BLM03AX102SN1 1,000 Ohm ±25% 200mA 1.25 Max.

Operating Temperature Range: -55 Deg C - +125 Deg C

Availability: 50 million units per month in December 2009
Price: Sample price at 5-yen/per unit
Patents: 4 patents pending

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