VPG Releases New FRSM Series of Ultra-High-Precision Z1-Foil Chip Resistors

With exceptional load-life stability of ±0.0025% (25 ppm) at 70°C and rated power for 2,000 hours and ±0.005% for 10,000 hours, low typical TCR of ±0.05 ppm/°C from 0°C to +60°C and ±0.2 ppm/°C from -55°C to +125°C, +25°C ref., power TCR (ΔR due to self-heating) of 5 ppm at rated power, and tight tolerances to ±0.01%.



The FRSM series is based on Vishay Foil Resistors' next-generation Z1-Foil technology. FRSM devices excel over all previous stability standards for precision resistors with an order-of-magnitude improvement in temperature stability, load-life stability, and moisture resistance. These new benchmark levels of performance provide design engineers with the tools to build circuits not previously achievable, while reducing costs in the most critical circuits by eliminating the need for corrective circuitry.



In addition to their remarkably improved load-life stability of ±0.0025%, the resistors are noise-free and provide ESD protection of 25 kV or more for increased reliability. The devices' solid element alloy is matched to the substrate, forming a single entity with balanced resistance versus temperature characteristics for an unusually low and predictable TCR over a wide temperature range from -55°C to more than +175°C. The adhesive that holds the foil to the flat substrate withstands high temperatures, pulsing power, moisture incursions, shock and vibration, and low-temperature exposure, while still holding securely to the foil element. Resistance patterns are photo-etched into the element to permit the trimming of resistance values to very tight tolerances as low as 0.01%.



Offered in six chip sizes from 0603 to 2512, the FRSM series features a wide resistance range from 5 Ω to 125 kΩ. Within this range, any as required value (e.g. 1.2345 kΩ vs. 1 kΩ) can be supplied at no extra cost or delivery time. The resistors feature power ratings to 750 mW at +70°C, a rise time of 1.0 ns with effectively no ringing, a thermal stabilization time of <1 s (nominal value achieved within 10 ppm of steady state value), current noise of 0.010 μVrms/V of applied voltage (<-40 dB), and a voltage coefficient of <0.1 ppm/V. The RoHS-compliant devices offer a non-inductive (<0.08 μH), non-capacitive design, and are available in matched sets upon request.



The FRSM series is optimized for a wide variety of demanding high-precision, high-temperature applications, including space and aviation. The devices provide exceptional levels of performance for differential amplifiers, switching power supplies, weighing systems, electron microscopes, measurement systems, mass flow meters, pressure controllers, medical instrumentation, down-hole equipment, data acquisition and control systems, and more.



Samples and production quantities of the FRSM series are available now, with lead times of five days for samples, and eight weeks for standard orders.