MALVERN, Pa.--(BUSINESS WIRE)--
Vishay Precision Group, Inc. (NYSE: VPG) today announced that its Vishay
Foil Resistors brand (VFR) has released two new ultra-high-precision
hermetically sealed Z-Foil power current sensing resistors with low TCR
of ±0.2 ppm/°C (from -55°C to +125°C, +25°C ref.), PCR (ΔR due to
self-heating) of 4 ppm/W typical, and tolerances to ±0.01%. Designed to
provide optimal performance when mounted on a chassis or cooled heat
sink, the hermetically sealed VHP4Z and VPR247Z offer power ratings of
10 W (heat sink) and 3 W (free air), and a four-terminal Kelvin
configuration for increased accuracy in high-power applications.
The VHP4Z and VPR247Z offer a welded construction and a screw-mount for
direct attachment to a metal heat sink. Hermetic sealing and a nitrogen
back-fill for the VPR247Z provide maximum protection against
environmental stresses to ensure long-term stability.
Ideal for applications such as test and measurement where rapid ΔR
stabilization and resistance stability under transient power conditions
are required, the devices offer excellent load-life stability down to
±0.005% typical (50 ppm) at 3 W (heat sink) at +25°C for 2,000 hours.
While the VHP4Z’s copper leads provide low thermal EMF, the VPR247Z
provides a significantly reduced size and weight and features
gold-plated copper leads for higher stability.
The VHP4Z and VPR247Z offer a thermal stabilization time of <1 s (within
10 ppm of steady state value) and a wide resistance range from 0.25 to
500 ohms. Any resistance value within this range is available at any
tolerance with no additional cost or lead time effect. The resistors
offer a rise time of 1.0 ns with effectively no ringing, current noise
of 0.010 µVrms/V of applied voltage (<-40 dB), and a voltage coefficient
of <0.1 ppm/V. The devices withstand ESD to at least 25 kV, for
increased reliability, and offer a non-inductive (<0.08 μH),
non-capacitive design.
“The VHP4Z and VPR247Z are based on our expertise in stress analysis and
proprietary methods of manufacturing precision 4-terminal resistors,”
said Yuval Hernik, Senior Director of Application Engineering for VFR.
“Their use of Z-Foil technology allows them to achieve a very low TCR
and PCR over a very wide temperature range. And since this important
specification is also influenced by the application’s assembly methods,
anticipated current fluctuations, and accuracy and response time
requirements, we are available to collaborate with our customers on
their designs for the most efficient design process.
“Every current sense resistor must have an error budget assigned to it
which, if exceeded, will cause the equipment to fall out of its
performance specification, or possibly fail. In addition to initial
tolerance, the error budget includes allowable shifts through shelf
life, assembly, TCR, shock, vibration, humidity exposure, thermal shock,
thermal EMF, load-life drift, ESD, radiation, and harmonic distortion.
The VHP4Z and VPR247Z are the perfect choice to accomplish the lowest
total end-of-life tolerance band.”
Samples and production quantities of the VHP4Z and VPR247Z are available
now, with lead times of five working days for samples and eight weeks
for larger orders.
Further information about the VHP4Z and VPR247Z and other Vishay Foil
Resistors products is available at www.vishayfoilresistors.com.
Follow Vishay Foil Resistors at http://twitter.com/foilresistor.
About Vishay Precision Group
Vishay Precision Group (VPG) is an internationally recognized designer,
manufacturer and marketer of: components based on its resistive foil
technology; sensors; and sensor-based systems specializing in the
growing markets of stress, force, weight, pressure, and current
measurements. VPG is a market leader of Foil Technology Products,
providing ongoing technology innovations in precision foil resistors and
foil strain gages, which are the foundation of the Company’s Force
Sensors Products and its Weighing and Control Systems. The product
portfolio consists of a variety of well-established brand names
recognized for precision and quality in the marketplace. To learn more,
visit VPG at www.vishaypg.com.
About VPG Foil Resistors
VPG Foil Resistors, a part of Vishay Precision Group (VPG), produces the
most precise and stable resistors available. Distinguished by the
premier brands Vishay Foil Resistors, Powertron, and Alpha Electronics,
the VPG Foil Resistors portfolio includes discrete resistors and
resistor networks in surface-mount and through-hole (fixed-lead)
configurations; customized chip resistor networks; precision trimming
potentiometers; and discrete chips for use in hybrid circuits. These
devices are used in applications requiring a high degree of precision
and stability, such as in medical testing equipment, semiconductor
equipment, precision measuring instruments, aerospace, and military
applications. To learn more, visit www.vishayfoilresistors.com.
Bulk Metal is a registered trademark of Vishay Precision Group, Inc.
Link to product photo:
http://www.flickr.com/photos/[email protected]/9254978055/sizes/l/in/photostream/
Link to detailed product information:
http://www.vishaypg.com/ppg?63239
Vishay Precision Group, Inc.
Marti Spalding, +1 919-374-5515
Director,
Global MarCom
[email protected]
Source: Vishay Precision Group, Inc.