The World's Smallest Ferrite Bead Noise Filter ~ Contributing to the Miniaturization and High Performance of IoT and Wearable Devices ~

  • Noise Suppression Products / EMI Suppression Filters / ESD Protection Devices


Murata Manufacturing Co., Ltd.
Chairman of the Board and President:
Tsuneo Murata

Murata Manufacturing Co., Ltd. (head office: Nagaokakyo-shi, Kyoto; Chairman of the Board and President: Tsuneo Murata) has commercialized the world’s smallest*1 ferrite bead noise filter BLMME Series, which helps reduce the size and increase the performance of IoT and wearable devices.

1. Background of Development

Noise filters are vital components of the power supply circuits and signal circuits of today’s electronic devices, and in some cases as many as 100 of these components are used in the latest smartphones, which are increasingly compact while delivering higher performance. In the interests of saving as much space as possible as devices continue to shrink, these noise filters need to be further miniaturized.
Moreover, in the IoT area, where the market is forecast to expand rapidly following the launch of fifth-generation cellular networks (5G), communication circuits will be embedded in various small devices, which is expected to further increase the demand for ultra-small noise filters.

The new products have achieved an approximately 50% smaller base area compared to existing models thanks to a further increase in the accuracy of Murata’s microfabrication technique used to miniaturize the multilayer products comprising the internal coil.

2. Key Features

The World’s Smallest Size

With dimensions of 0.3×0.15×0.225mm(L × W × T), the new products’ base area is 56% smaller than that of existing models*2. This helps reduce its footprint in electronic circuits substantially, thereby contributing to denser circuit design.

Equal Characteristics and Performance to Existing Models Maintained
Generally, there is a problem in that the smaller ferrite bead noise filters become, the more disadvantageous the impedance and DC residence characteristics become. However, thanks to Murata’s microfabrication technique, the new products achieve an equivalent performance to that of larger conventional products.
(Performance: impedance 150Ω (100 MHz), DC resistance 0.70Ω)

3. Future Development

Sample shipments of the products have begun as the BLMME Series ferrite bead noise filter and mass production is scheduled to begin in June 2019.
At the outset of shipping, a single type with an impedance of 150Ω will be made available, and in future we will develop a wide array of products with diverse features to match market and specific customer requirements.
Anticipated uses are not limited to smartphones but include a variety of electronic devices including home electronics, wearable devices, and electric vehicles such as self-driving cars, as well as drones and industrial machinery.

  The world’s smallest ferrite bead noise filter based on an internal survey, as of November 2018.
  Compared with a ferrite bead noise filter with the size of 0.4×0.2×0.2㎜(L×W×T).

Murata in Brief

Murata Manufacturing Co., Ltd. is a worldwide leader in the design, manufacture and sale of ceramic-based passive electronic components & solutions, communication modules and power supply modules. Murata is committed to the development of advanced electronic materials and leading edge, multi-functional, high-density modules. The company has employees and manufacturing facilities throughout the world. For more information, visit Murata's website at