High-temperature inductors deliver higher current density for multi-phase power supplies

By Gina Roos, editor-in-chief

Vishay Intertechnology, Inc. has launched the first device in its new IHSR series of high-temperature commercial inductors , touting a 50% reduction in direct current resistance (DCR) compared to typical power inductors and a 20% or greater profile reduction compared to similar ferrite products. The inductors also claim a standard DCR tolerance of 5%, with 3% available for more accurate current sensing.

The Vishay Dale IHSR-4040DZ-51  is designed for multi-phase, high-current power supplies and filters in computer, industrial, and telecom applications. Offering a frequency range up to 5 MHz, the device is optimized for energy storage in DC/DC converters and high-current filtering up to the self-resonant frequency (SRF) of the inductor (see table below). Applications 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 offers a low typical DCR of 0.520 mΩ and inductance of 0.130 µH, which enable higher current density than competing technologies, in a 4-mm profile. Key specs include high-temperature operation to 155°C, rated current to 92 A, and the capability to handle high-transient-current spikes without saturation. The first devices are available in a 10 x 10-mm 4040 case size. Other package sizes will be available in the future.

The IHSR-4040DZ-51 is RoHS-compliant, halogen-free, and Vishay Green . It’s housed in a 100% lead-free, shielded, composite construction that reduces buzz noise to ultra-low levels, said Vishay. The inductors also offer high resistance to thermal shock, moisture, and mechanical shock.

Device Specification Table:

Samples and production quantities are available now, with lead times of 12 weeks for large orders. Pricing for U.S. delivery is $0.65 each in quantities of 5,000.