VPG Announces First Ultra-High-Precision Z-Foil Surface-Mount Current
Sensing Chip Resistor to Combine High Power to 1 W With Low TCR of +/-0.2
MALVERN, Pa. -- April 15, 2013
Vishay Precision Group, Inc. (NYSE: VPG) today announced that its Vishay Foil
Resistors brand (VFR) has released a new ultra-high-precision Z-Foil
surface-mount current sensing chip resistor that is the industry’s first such
device to combine a high power rating of 1 W at +70°C and low TCR of ±0.2
ppm/°C typical from -55°C to +125°C, +25°C ref. By dissipating up to 1 W in
the 1625 package size, the VCS1625ZP allows designers to use a single device
to measure larger currents than previously possible. For high-power
applications, the device offers tight tolerances to ±0.2% (0.1% and 0.05% are
available) and a four-terminal Kelvin configuration for increased accuracy.
The VCS1625ZP features a power coefficient (ΔR due to self-heating) of 5 ppm
at rated power, a thermal stabilization time of <1 ns (nominal value achieved
within 10 ppm of steady state value), and a wide resistance range from 0.3 Ω
to 10 Ω. Any resistance value within this range is available at any tolerance
with no additional cost or lead time effect. The resistor offers a rise time
of 1.0 ns with effectively no ringing, short time overload of <0.005% (50
ppm), current noise of 0.010 µVrms/V of applied voltage (<-40 dB), and a
voltage coefficient of <0.1 ppm/V.
Offering the utmost in electrostatic discharge (ESD) immunity, the device
withstands ESD to at least 25 kV, for increased reliability, and offers a
non-inductive (<0.08 μH), non-capacitive design. The Bulk Metal^® Foil
technology of the VCS1625ZP provides a significant reduction of the resistive
component’s sensitivity to ambient temperature variation (TCR) and to the
self-heating effect caused by changing loads. This allows designers to
guarantee a high degree of stability and accuracy in fixed-resistor
applications. In addition, the resistor’s design results in a very low thermal
EMF of 0.05 μV/°C typical, which is critical in precision applications.
The VCS1625ZP’s load-life stability of 0.015% at +70°C for 2000 hours at rated
power is an order of magnitude better than typical current sensing resistors.
The device’s improved stability makes it ideal for tightened-stability
reference voltage and precision current sensing applications in forced-balance
electronic scales, measurement instrumentation, bridge networks, motor
controllers, and medical and test equipment. In addition, the resistor can be
tested in accordance with EEE-INST-002 (MIL-PRF 55342) for military and space
The all-welded construction of the VCS1625ZP is composed of a Bulk Metal Foil
resistive element with plated copper terminations. The flat terminations make
intimate contact with the resistive layer along the entire side of the
resistive element, thereby minimizing temperature variations. In addition to
the low thermal EMF compatibility of the device’s metals, the uniformity and
thermal efficiency of the design minimize the temperature differential across
the resistor, thereby assuring low thermal EMF generation at the terminations.
This further reduces the thermal EMF voltage, or “battery effect,” exhibited
by most current sensing or voltage reference resistors.
The device released today is characterized by extremely low excess noise when
compared with other resistor technologies. Additionally, the current in
adjacent current carrying paths runs in opposing directions, cancelling the
parasitic inductance of these paths. Also, path-to-path capacitances are
connected in series, which has the effect of minimizing the parasitic
capacitance of the resistor. The low-inductance/capacitance device is
characterized by non-measurable peak-to-peak signal distortions.
The VCS1625ZP is available with tin/lead or lead (Pb)-free gold or tin
termination options, and with additional post-manufacturing operations (PMO)
to extend the operating temperature from +150°C to well above +200°C.
Samples and production quantities of the VCS1625ZP are available now, with
lead times of five working days for samples and eight weeks for standard
Further information about the VCS1625ZP 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.
Link to detailed product info: http://www.vishaypg.com/ppg?63155
Link to product photo: http://www.flickr.com/photos/47034298@N02/8615161436
Vishay Precision Group
Marti Spalding, +1 919-374-5515
Director, Global MarCom
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