Ferrite beads reduce EMI in automotive designs

Surface mount ferrite beads developed by Murata today are in a 1608 package, (i.e 1.6 x 0.8mm) and designed specifically for automotive applications.

The BLM18SP_SH1 series has been introduced in response to the increase in electronics-based automotive systems and the associated need to reduce the potential for electromagnetic interference (EMI).  Many new automotive applications, such as advanced driver assistance systems (ADAS), use complex electronic components and modules that are extremely sensitive to stray EMI. Ferrite beads are an essential component to lower conducted and radiated electromagnetic emissions from power lines, says Murata.

The BLM18SP_SH1 ferrite beads are based on a new internal electrode fabrication claimed to improve the impedance characteristics while lowering the DC series resistance. They are compliant with the AEC-Q200 automotive stress resistance tests for passive components. There are five components in the range, with impedance values from 30 Ohm to 1kOhm and rated current from 1.2 to 6.0A. Impedance is specified at 100MHz and rated current at 85 degrees C. The BLM18SP_SH1 ferrite beads support an operational temperature range of -55 to +125 degrees C, with derating.

The BLM18SP_SH1 is half the size of Murata’s BML21PG series ferrite beads which are constructed in a 2012 (2.0 x 1.25mm) package. This is critical where board space is at a premium. Reducing the size of the EMI noise suppression components allows more space to be available for the end-application.

Murata manufactures electronic components, modules and devices. The product range includes ceramic capacitors, resistors/thermistors, inductors/chokes, timing devices, buzzers, sensors and EMI suppression filters. In addition to ceramic capacitor manufacture, Murata also produces Bluetooth and Wi-Fi modules, board-mount DC/DC converters together with standard and custom AC/DC power supplies.

Established in 1944, Murata is headquartered in Japan and has European offices in Finland, France, Germany, Hungary, Italy, the Netherlands, Spain, Switzerland and the UK.


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