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Vishay’s New Ultra- High-Precision, Surface-Mount Bulk Metal® Z-Foil Resistors for AMS Applications Are First to Combine ESD Immunity up to 25 kV, Long-Term Stability Down to ±0.005 % (50 ppm), and Low Typical TCR of ±0.2 ppm/°C
Devices Can Withstand 100-Cycle Thermal Shock with a Shift of < 20 ppm and Thermal Stabilization Time of < 1 Second; Vishay Foil Resistors are Available with “As Required” Values (e.g., 2049.67 Ω vs. 2000 Ω)with No Extra Cost or Lead Time
MALVERN, Pa. — Feb. 13, 2009 — Vishay Intertechnology, Inc. (VSH: NYSE) today announced that its new series of ultra- high-precision, wraparound surface-mount Bulk Metal® Z Foil (BMZF) resistors for avionics, military and space (AMS) applications is now available with post-manufacturing screening (PMO) in accordance with EEE-INST-002, DSCC, and EPPL. The new screening option is available for devices in the 0805 through 2512 case sizes.
Several PMO options are available to Vishay customers to further enhance the already-high stability of the new SMD wraparound devices based on the VSMP configuration. These include processing to remove the 100 ppm knee in the load life curve, such that the load life curve becomes virtually flat from time zero, and temperature cycling and elevated temperature exposure to further improve stability. Further information can be requested from foil@vishay.com.
The new SMD resistors for AMS applications are the industry’s first devices to provide high power ratings up to 750 mW at 70 °C with long-term stability down to ±0.005%, low typical TCR of ±0.2 ppm/°C, Power Coefficient of Resistance (“ΔR due to self heating”) of ±5 ppm at rated power, and tight tolerance of ±0.02 %.
Z-Foil improves stability by an order of magnitude compared to any other resistor technology, allowing designers to guarantee a high degree of accuracy in fixed resistor applications.
The stability problems associated with analog circuits are very pervasive, but knowledgeable selection of a few high-quality resistors, resistor networks, or trimming potentiometers in critical locations can greatly improve the efficiency of circuit design and long-term application-related performance.
With the new SMD resistors for AMS high reliability applications, any value from 10 Ω to 100 kΩ is available with a device that can retains its initial accuracy within several parts per million. This means that the instrument calibration cycle can be extended, or, in applications where no calibration cycle is possible (such as space applications), the designer can rely on anticipated shifts or specify further stabilization with well documented enhancements to ensure compliance with end-of-life design criteria.
Surface-Mount Bulk Metal® Z-Foil Resistors for AMS: Summary Table
Chip Size Maximum Power @ 70 °C Change in Resistance Resistance Range (ohms) Physical Dimensions
0805 200 mW ±0.005% @ 100 mW
±0.01% @ 200 mW
10 to 7,000 Ω 0.080 x 0.050 x 0.025 in.
2.03 x 1.27 x 0.64 mm
1206 300 mW ±0.005% @ 150 mW
±0.01% @ 300 mW
10 to 20,000 Ω 0.126 x 0.062 x 0.025 in.
3.20 x 1.57 x 0.64 mm
1506 300 mW ±0.005% @ 150 mW
±0.01% @ 300 mW
10 to 25,000 Ω 0.150 x 0.062 x 0.025 in.
3.81 x 1.57 x 0.64 mm
2010 500 mW ±0.005% @ 200 mW
±0.01% @ 500 mW
10 to 55,000 Ω 0.198 x 0.097 x 0.025 in.
5.03 x 2.46 x 0.64 mm
2512 750 mW ±0.005% @ 500 mW
±0.01% @ 750 mW
10 to 100,000 Ω 0.249 x 0.127 x 0.025 in.
6.32 x 3.22 x 0.64 mm
Designers often pay more than they need to for tighter tolerances simply to accommodate the resistance shifts they know to be inherent in a given application. Using the new SMD series (0805-2512) allows the use of looser tolerances than would be necessary with other resistor technologies. For example, after 2,000 hours under full rated load at 70 °C, the resistance shift experienced by this SMD series is just 0.005 % or more than an order of magnitude lower than the typical 1.0 % experienced by other resistor technologies.
Additional features include a low thermal EMF of less than 0.1 μV/°C, voltage coefficient below 0.1 ppm/V, inductance lower than 0.08 μH, and response time faster than 1 ns effectively no ringing. The noise generated by these resistors is less than -40 dB, or essentially noise-free.
A robust conventional wrap-around termination and top coating ensures safe handling during the mounting process and provides stability during the multiple thermal cyclings the device will experience over its lifetime.
Available in waffle-pack and tape-and-reel packaging, samples and production quantities of the new wrap-around AMS resistors with post-manufacturing screening are available now. Lead time for production quantities is six to eight weeks and can be accelerated on request.
Vishay Precision Group Inc. has ceased to be a subsidiary of Vishay Intertechnology Inc. and is an independent publicly owned company.