The VAR, composed of Vishay’s Bulk Metal® Z-foil technology, with improved sound quality, provides a combination of low noise and low inductance/capacitance, making it unrivalled for applications requiring low noise and distortion-free properties.
Temperature coefficient of resistance (TCR): ± 0.05 ppm/°C typical (0 °C to + 60 °C,+ 25 °C ref.) ± 0.2 ppm/°C typical (0 °C to + 125 °C, + 25 °C ref.)
Rated power: to 0.4 W at + 70 °C
Resistance tolerance: to ± 0.01 % (0.005% is available)
Load life stability: to ± 0.005 % at 70 °C, 2000 h at rated power
Resistance range: 10 Ω to 100 kΩ
"Naked Z-foil resistor" design without molding or encapsulation adds an additional dimension for reducing signal distortion and increasing clarity in signal processing.
Electrostatic discharge (ESD) at least to 25 000 V
Non-inductive, non-capacitive design
Rise time: 1 ns, effectively no ringing
Current noise: 0.010 µV (RMS)/Volt of Applied Voltage (< - 40 dB)
Thermal EMF: 0.05 µV/°C
Voltage coefficient: < 0.1 ppm/V
Thermal stabilization time < 1 s (nominal value achieved within 10 ppm of steady state value)
Inductance: < 0.08 µH typical
The Z-Foil chip in the VAR has been especially treated to increase load life stability.