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
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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
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
Percent of Rated Power at + 125 °C
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:
[email protected]
Document Number: 63140 Revision: 12-Feb-08
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 app.