Murata has introduced a series of chip ferrite beads with a 20A current rating, aiming them at the battery charging systems and powertrains of electric vehicles, as well as in industrial equipment.
Called the BLE32SN series, its members are 3.2 x 2.5 x 2mm (1210 or metric 3225) and operate over -55 to +125°C or -55°C to +150°C.
“By leveraging advanced structural simulation techniques, Murata engineers have created a proprietary internal electrode design,” according to the company. “This increases the electrode volume of these chips compared with those using a conventional arrangement. It has resulted in a significant lowering of their dc resistance. Consequently, heat generation is reduced, so less thermal management is needed.”
All the parts are rated at 20A up to 125°C, then the higher temperature versions derate linearly to 10mA at 150°C.
All parts have identical 600μΩ max dc resistance and 12Ω ±5Ω impedance at 100MHz.
*watch this space: having scoured the product pages and data sheets to discover what technical reason suits the …SH1 to power train use while the …SZ1 is for infotainment, Electronics Weekly has got nowhere, and so has asked Murata.
Update: Murata responds:
The difference between H- type and Z- type as well as S- type vs B- type is in the design and selection of material for the termination to fulfil the different requirements in terms of reliability.
Example product page: BLE32SN120SZ1