The Vishay inductors feature a low DCR in a 4040 case size with a 4-mm profile

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:

Case size 4040
Profile (mm) 4.0
Inductance (µH) 0.130
DCR typ. (mΩ) 0.520
DCR max. (mΩ) 0.546
Heat rating current (A) 72
Saturation current (A) 63(1) / 92(2)
SRF typ. (MHz) 151


(1) DC current (A) that will
cause L0 to drop approximately 20%
(2) DC current (A) that will cause L0 to drop approximately

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.