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Vishay Foil Resistors
Document No.: 63244
Revision: 02-Oct-2013
www.vishayfoilresistors.com
1
AUR (Z-Foil for Audio)
Ultra High-Precision Through-Hole Bulk Metal® Z-Foil Technology, Low Profile Conformally Coated for Audio Applications with TCR Down to 0.05 ppm/°C, Low Harmonic Distortion, and Noise Stabilization
AUR (Z-Foil for Audio)
Ultra High-Precision Through-Hole Bulk Metal
®
Z-Foil Technology, Low Profile Conformally Coated for
Audio Applications with TCR Down to 0.05 ppm/°C,
Low Harmonic Distortion, and Noise Stabilization
Document No.: 63244
Revision: 02-Oct-2013
FEATURES
• Temperature coefficient of resistance (TCR):
±0.05 ppm/°C nominal (0°C to +60°C)
±0.2 ppm/°C nominal (–55°C to +125°C, +25°C ref.)
(see Table 1)
• Tolerance: to ±0.01%
• Power rating: to 300 mW at +70°C
• Load life stability: to ±0.01% at 70°C, 2000 h at rated
power
• Resistance range: 5 Ω to 120 kΩ
• Vishay Foil resistors are not restricted to standard
values; specific “as required” values can be supplied at
no extra cost or delivery (e.g., 1K2345 vs. 1K)
• Significantly lower microphonics than any other resistor
technology
• Thermal stabilization time: <1 s (within 10 ppm of
steady state value)
• Electrostatic discharge (ESD): up to 25 kV
• Maximum working voltage: 300 V
• Non-inductive, non-capacitive design
• Rise time: 1 ns effectively no ringing
• Current noise of 0.010 μV
rms
/ V of applied voltage
(<–40 dB)
• Voltage coefficient <0.1 ppm/V
• Non-inductive: <0.08 μH
• Non hot spot design
• Terminal finish: lead (Pb)-free or tin/lead alloy
• Matched sets are available per request
RELATED FACTS AT A GLANCE
Please refer to FACTS #106, Selecting Resistors for Pre-
Amp, Amplifier, and Other High-End Audio Applications.
INTRODUCTION
Many manufacturers and users of precision electronic
equipment suffer needlessly from unexplained instabilities
and drifts due to noise effects and harmonic distortion.
They resign themselves to making constant adjustments
and troubleshooting. But in fact these can be avoided.
Instability is often traceable to a few supposedly “fixed”
resistors which are not really fixed at all. If these resistors
would only retain their original values, there would be
no need for costly controls and other compensating
circuitry. That’s why the only resistor for applications
such as these is Z Bulk Metal
®
Foil. In high-end audio
equipment, careful selection of resistors is one of the
best ways to avoid or minimize noise and distortion in the
signal path. Noise is an unwanted wide spectrum signal
that may be superimposed on any useful signal, including
DC. Resistors, like other passive components, are noise
sources to various degrees, depending upon resistance
value, temperature, applied voltage, and resistor type.
Many experiments have been done to show why some
resistors are “noisier” than others. But the only test
that audio experts and audiophiles have agreed on is
comparing the level of fidelity that results when different
resistor technologies are used in actual audio systems.
High-end analog audio applications require low intrinsic
noise, high linearity of amplification, and minimal dynamic
distortion. The typical audio amplifier consists of a voltage
preamplifier (preamp) and power amplifier (final driver).
The voltage preamplifier deals with low-level signals.
That is why its intrinsic noise level is critical. Resistors are
among the principal noise sources in the amplifiers. The
main requirements for the audio power amplifier are high
linearity of amplification and minimal dynamic distortion.
Vishay Foil resistors are characterized by very low intrinsic
non-linearity of the resistive element, which is made from
cold-rolled bulk metal.
The AUR, composed of VFR’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.
AURJ
AURAUR2J
AUR2
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