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MALVERN, PENNSYLVANIA — May 2, 2011 — Vishay Precision Group, Inc. (NYSE: VPG) today announced that its Vishay Foil Resistors division has released the CSM3637P, a new low-value current sense resistor with an improved power rating of 5 W, maximum current handling up to 40 A, and an absolute TCR of ±15 ppm/°C maximum. The resistance value range for the CSM3637P is 3 mΩ to 100 mΩ. Any “as required” value (such as 10.2345 mΩ vs. 10 mΩ) is available within that range at no extra charge and with no additional delivery time.
The high 5 W rating of the CSM3637P, which represents a key advance for this device type, is enabled by the installed heat sink on top of the resistive element, allowing better heat dissipation. The four-terminal device is also designed with its current leads separated from the voltage sensing leads, significantly reducing termination resistance.
A further benefit of the CSM3637P is its low thermal EMF of less than 3 μV/°C, enabled by a design in which the welded terminals make intimate contact with the chip and thus minimize temperature differentials. This construction reduces the “battery effect” or parasitic voltage exhibited by most current-sensing resistors, while protecting pure current-to-voltage conversion from such interference in DC applications.
The CSM3637P features an improved load-life stability of ±0.2% at +70°C for 2000 h at rated power, an absolute TCR of ±15 ppm/°C from −55°C to +125°C (+25°C ref.), and a tolerance of ±0.1%. Its load-life stability represents an approximate five-fold improvement over typical current-sensing resistors, which means better stability for voltage division and precision current sensing applications in switching linear power supplies, power amplifiers, measurement instrumentation, bridge networks, and medical and test equipment.
The low absolute TCR provided by the CSM3637P reduces errors due to temperature changes and thus reduces a major source of uncertainty in current measurement, even for systems that need to work in extremely high temperatures or radiation rich environments, including down-hole oil exploration and well logging equipment or the deep-sea underwater repeaters used for cross-ocean communications.
The stability of the CSM3637P can be further enhanced by post manufacturing operations (PMOs) expressly developed for Bulk Metal® Foil resistors, which include temperature cycling, short-time overload, and accelerated load life.
Samples and production quantities of the CSM3637P are available now, with lead times of five working days for samples, and six weeks for standard orders.
About Vishay Foil Resistors
Vishay Foil Resistors is a division of Vishay Precision Group, producing the most precise and stable type of resistors available. The portfolio comprises products in a variety of resistor configurations and package types to meet the needs of a wide range of applications: discrete resistors and resistor networks in surface mount and through-hole (leaded) configurations; customized chip resistor networks; precision trimming potentiometers; and discrete chips for use in hybrid circuits. The foil resistors and current sensors are used in applications requiring a high degree of precision and stability, such as in medical testing equipment, high performance audio equipment, precision measuring instruments and aerospace and military applications.
About Vishay Precision Group
Vishay Precision Group (VPG) produces sensors based on precision resistive foil technology, and sensor-based systems. It provides vertically integrated products and solutions for multiple growing markets in the areas of stress, force, weight, pressure and current measurements. As a spin-off from Vishay Intertechnology, VPG’s decades-long track record encompasses innovations in foil precision resistors, current sensors, and strain gages, which have served as a foundation for VPG’s more recent expansion into strain gage instrumentation, load cells and transducers, weighing modules and complete systems for process control and on-board weighing. Vishay Precision Group may be found on the Internet at www.vishaypg.com.