Vishay Intertechnology's VPR220Z ultra-high-precision Z-Foil resistor provides an industrial-grade absolute TCR of ±0.05ppm/°C from 0°C to +60°C and ±0.2ppm/°C from −55°C to +125°C, +25°C ref., a power rating up to 8W at +25°C per MIL-PRF-39009 (1.5W in free air), a power coefficient ("ΔR due to self heating") of ±5ppm at rated power, and a tolerance of ±0.01%.

The VPR220Z resistor is built on Vishay's "Z-Foil" technology, which provides a significant reduction of the resistive components sensitivity to ambient temperature variations (TCR) and applied power changes (PCR). Z-Foil improves stability, allowing designers to guarantee a high degree of accuracy in fixed-resistor applications.

The VPR220Z allows designers to achieve good performance by combining a range of ultra-high-precision specifications in a single device. These specifications include a load-life stability of ±0.005% (50ppm) for 2000 hours at +25°C; a low voltage coefficient of <0.1PPM/V; current noise of <-42dB; and thermal EMF of 0.05μV/°C. The resistor features a non-inductive (<0.08μH), non-capacitive design, and a 4-Kelvin connection for increased accuracy.

The VPR220Z has a thermal stabilization time of <1 second, compared to other resistor technologies which can take several seconds or even minutes to achieve a steady state thermal stabilization, and a nearly immeasurable 1.0-ns rise time without ringing. Optimised for military and space applications according to EEE-INST-002 screening, the resistor is built to handle unconventional environmental conditions with minimal drift.

Offering ESD immunity, the device withstands electrostatic discharges exceeding 25kV, for increased reliability. Within a resistance range of 5Ω to 10kΩ, any value at any tolerance is available through calibration at no additional cost. Featuring the TO-220 package, the VPR220Z is offered with lead (Pb)-free and tin/lead alloy finishes, and is available in a surface-mount version, the VPR220SZ.

Typical applications for the resistor will include dc-to-dc converters, precision current sensing, feedback circuits, and precision amplifiers in test and measurement instrumentation, medical systems, satellites and aerospace systems, commercial and military avionics, and weapons systems.

Both the VPR220Z and VPR220SZ ultra-high-precision resistors are available now, with lead times of 72 hours for samples, and three weeks for standard orders.

More information: www.vishay.com