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Bourns Introduces Shielded Inductors that Keep Noise Down in Power-Dense DC-DC Converters
According to the company, the series covers inductance values of 0.24 to 4.70 μH while delivering saturation current (ISAT) of 1.6 to 5.5 A and heating currents (IRMS) of 1.1 to 3.5 A. The high saturation current is supported without core collapse under the load, and it can be maintained across the full operating temperature range, which spans from −40 to 125°C. The small footprint is designed to be dropped into compact power-conversion circuits with minimal changes to the circuit board.
Inside the Inductors: Metal-Alloy Powder Core Covered in Shielding
The mini-inductors are made from a metal-alloy powder core. It offers high resistivity that suppresses eddy currents and reduces core losses at high switching frequencies, preserving signal integrity in noise-sensitive designs, said Bourns.
The shielded construction of the SRP2008DP contains magnetic flux, reducing radiated emissions that can interfere with adjacent components on the PCB. The contained flux minimizes magnetic coupling to nearby traces and components, reducing the risk of interference in densely populated layouts. On top of that, the 0.8-mm low-profile package fits height-constrained designs where vertical space is limited for traditional, bulky shielded inductors.
“As electronic systems grow more sophisticated while shrinking in size, the components inside them have to keep pace,” said Wedley, adding that the new series “gives engineers all the safety, signal integrity, and compliance benefits of a shielded, high-current inductor in a footprint that doesn’t compromise their layout.”
