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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: foil@vishay.com
TIGHTEST TOLERANCE
(%)
0.01
0.01
0.02
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No Preview Available !

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 assumes no
responsibility for
damage caused by
improper handling.
TABLE 2 - SPECIFICATIONS
RESISTANCE RANGE
(Ω)
MAXIMUM
WORKING
VOLTAGE
10 to 100K
200
AMBIENT
POWER RATING
at
+ 70 °C
at
+ 125 °C
0.4 W
0.2 W
DIMENSIONS
INCHES
W: 0.080 max.
L: 0.250 max.
H: 0.310 max.
LL: 1.000 ± 0.125
LS: 0.150 ± 0.005
mm
W: 2.03 max.
L: 6.35 max.
H: 7.87 max.
LL: 25.4 ± 3.18
LS: 3.81 ± 0.13
FIGURE 3 - POWER DERATING CURVE
200 % - 55 °C
175 %
+ 70 °C
Double Rated Power
150 %
125 %
100 %
Rated Power
75 %
50 %
25 %
0
- 75 - 50 - 25 0 + 25 + 50 + 75 + 100 + 125 + 150 + 175 + 200
Ambient Temperature (°C)
FIGURE 4 - TRIMMING TO VALUES
(Conceptual Illustration)
Interloop Capacitance
Reduction in Series
Mutual Inductance
Reduction due
to Opposing
Current in
Adjacent Lines
Current Path
Before Trimming
Current Path
After Trimming
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
Note: Foil shown in black, etched spaces in white
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For any questions, contact: foil@vishay.com
Document Number: 63140
Revision: 12-Feb-08

No Preview Available !

VAR (Vishay Audio Resistor)
Ultra High Precision, High Resolution Z-Foil Audio Resistor, Vishay Foil Resistors
with TCR of ± 0.2 ppm/°C, Tolerance to ± 0.01 %
and Noise < - 40 dB
TABLE 3 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y070680K5000T9L (preferred part number format)
DENOTES PRECISION
RESISTOR
Y
VALUE
R=Ω
K = kΩ
AER*
0 = standard part, tin/lead termination
9 = standard part, lead (Pb)-free termination
1 - 999 = custom
Y0 7 0 6 8 0K5 0 0 0 T 9 L
PRODUCT CODE
0706 = VAR
RESISTANCE TOLERANCE
T = ± 0.01 %
Q = ± 0.02 %
A = ± 0.05 %
B = ± 0.1 %
C = ± 0.25 %
D = ± 0.5 %
F = ± 1.0 %
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0706 80K5000 T 9 L:
TYPE: VAR
VALUE: 80.5 kΩ
ABSOLUTE TOLERANCE: ± 0.01 %
TERMINATION: lead (Pb)-free
PACKAGING: bulk pack
Note
* Application engineering release: for non-standard requests, please contact application engineering.
PACKAGING
L = bulk pack
Document Number: 63140
Revision: 12-Feb-08
For any questions, contact: foil@vishay.com
www.vishay.com
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