Surface mount ferrite beads for automotive designs
Murata has launched a series of surface mount ferrite beads in a 1608 chip package specifically for automotive applications.
The BLM18SP_SH1 ferrite beads use a new internal electrode fabrication approach that improves the impedance characteristics while lowering the DC series resistance. Compliant with the AEC-Q200 automotive stress resistance tests for passive components, there are five devices in the range with impedance values from 30 Ω to 1 kΩ and rated current from 1.2 to 6 A. The impedance is specified at 100 MHz, and rated current at 85°C. The ferrite beads support an -55°C to +125°C operational temperature range with derating.
As the amount of electronics-based automotive systems continues to increase, so does the need to reduce the potential for electromagnetic interference to impact safe operation. Many of the new automotive applications such as advanced driver assistance systems (ADAS) use a variety of complex and sophisticated electronic components and modules that are extremely sensitive to stray electromagnetic interference. Ferrite beads are an essential component to lower conducted and radiated electromagnetic emissions from power lines.
Compared to Murata‘s current BML21PG series ferrite beads in a 2012 (2.0 mm x 1.25 mm) package, the BLM18SP_SH1 series is half the size at 1.6 mm x 0.8 mm. As board space is at a premium for all applications, reducing the size of the EMI noise suppression components leaves more space for other devices.
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