High Temperature IHSR Inductor Offers Higher Current Density for Multi-Phase Power Supplies


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High Temperature IHSR Inductor Offers Higher Current Density for Multi-Phase Power Supplies

Vishay Intertechnology released its first device in new IHSR series of high temperature commercial inductors. Designed for multi-phase, high current power supplies and filters in computer, industrial, and telecom applications, the Vishay Dale IHSR-4040DZ-51 can reduce DCR 50% over typical power inductors and a 20 % profile reduction over similar ferrite products. In addition, the inductor boasts an unprecedented standard DCR tolerance of 5 %, with 3 % available for more accurate current sensing.


With a frequency range up to 5 MHz, the IHSR-4040DZ-51 is optimized for energy storage in DC/DC converters and high current filtering up to the self-resonant frequency (SRF) of the inductor. The intended applications of the device include notebooks, desktop PCs, and servers; low profile, high current power supplies and filters; and DC/DC converters for distributed power systems.


The IHSR-4040DZ-51’s low typical DCR of 0.520 mΩ and inductance of 0.130 µH allow for higher current density than competing technologies, while its 4 mm profile enables slimmer end products. The inductor offers high temperature operation to +155 °C, rated current to 92 A, and handles high transient current spikes without saturation. The device is available in the 10 mm by 10 mm 4040 case size; additional case sizes will be offered in the future.


Packaged in a 100 % lead (Pb)-free shielded, composite construction that reduces buzz noise to ultra low levels, the inductor offers high resistance to thermal shock, moisture, and mechanical shock. The IHSR-4040DZ-51 is RoHS-compliant, halogen-free, and Vishay Green.


Device Specification Table

Case size


Profile (mm)


Inductance (µH)


DCR typ. (mΩ)


DCR max. (mΩ)


Heat rating current (A)

72 A

Saturation current (A)

63(1) / 92(2)

SRF typ. (MHz)



Samples and production quantities of the new inductor are available now, with lead times of 12 weeks for large orders

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