VAR (Vishay Audio Resistor)
Vishay Foil Resistors
Ultra High Precision, High Resolution Z-Foil Audio Resistor, with TCR of ± 0.2 ppm/°C, Tolerance to ± 0.01 % and Noise < - 40 dB
Any value at any tolerance available within resistance range
INTRODUCTION 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.
While the regular foil resistors are already widely acknowledged as the leading resistors for audio applications, the special “naked Z-foil resistor” design without mold or encapsulation, adds an additional dimension for reducing signal distortion and increasing clarity in signal processing.
Our application engineering department is available to advise and to make recommendations. For non-standard technical requirements and special applications, please contact us.
FIGURE 1 - TYPICAL TCR CURVE Z-FOIL
FEATURES
• Temperature coefficient of resistance (TCR): - 55 °C to + 125 °C, 25 °C ref. ± 0.2 ppm/°C typical (see table 1)
• Rated power: to 0.4 W at + 70 °C
Pb-free Available
RoHS*
COMPLIANT
• Tolerance: to ± 0.01 %
• Load life stability: to ± 0.01 % at 70 °C, 2000 h at rated power
• Resistance range: 10 Ω to 100 kΩ (higher or lower values of resistance are available)
• Electrostatic discharge (ESD) above 25 000 V
• Non inductive, non capacitive design
• Rise time: 1 ns without ringing
• Current noise: < - 40 dB
• Thermal EMF: 0.05 µV/°C typical
• Voltage coefficient: < 0.1 ppm/V
• Low inductance: < 0.08 µH typical
• Non hot spot design
• Terminal finishes available: lead (Pb)-free tin/lead alloy
+ 500 + 400 + 300 + 200 ΔR + 100 R0 (ppm)- 100 - 200 - 300 - 400 - 500
0.05 ppm/°C
- 0.1 ppm/°C - 0.16 ppm/°C
0.1 ppm/°C 0.14 ppm/°C 0.2 ppm/°C
- 55 - 25
0 + 25 + 60 + 75 + 100 + 125 Ambient Temperature (°C)
APPLICATIONS • High precision amplifiers • High-end speaker system • High-end audio circuit • Transducer • High fidelity audio amplifier
TABLE 1 - RESISTANCE VERSUS TCR (- 55 °C to + 125 °C, + 25 °C Ref.)
RESISTOR
RESISTANCE VALUE (Ω)
TYPICAL TCR AND MAXIMUM SPREAD (ppm/°C)
100 to < 100K
± 0.2 ± 1.8
VAR
50 to < 100
± 0.2 ± 2.8
10 to < 50
± 0.2 ± 3.8
Note: • For other values and tighter tolerances, please contact application engineering using the footer below
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63140 Revision: 12-Feb-08
For any questions, contact:
[email protected]
TIGHTEST TOLERANCE (%) 0.01 0.01 0.02
www.vishay.com 1
VAR (Vishay Audio Resistor)
Vishay Foil Resistors Ultra High Precision, High Resolution Z-Foil Audio Resistor,
with TCR of ± 0.2 ppm/°C, Tolerance to ± 0.01 % and Noise < - 40 dB
FIGURE 2 - STANDARD DIMENSIONS
L
W
H
LL LS
Soldered PCB
Lead Material #22 AWG Round Solder Coated Copper
This product is fragile and may be damaged
if mishandled.
Vishay assu.