VFD244
Bulk Metal® Foil Technology High Precision Voltage Divider Resistors
with TCR Tracking to 0.5 ppm/°C and
Tolerance Match to 0.005 % (50 ppm)
VF
VF
D2
(D
.C
.)
FEATURES
R
44
APPLICATIONS
R2
Instrumentation amplifiers
Bridge networks
Differential amplifiers
R1
Vin
-
Military
+
Space
Vout
VFD244
VFD244Z
Medical
Automatic test equipment
Down-hole (high temperature)
TABLE 1 - RATED POWER PER ELEMENT
MAXIMUM POWER
RATING AT 70 °C
PER ENTIRE
PACKAGE
MAXIMUM POWER
RATING AT 125 °C
PER ENTIRE
PACKAGE
1 to < 100 k
1W
(not exceed 0.6 W
per element)
0.5 W
(not exceed 0.3 W
per element)
100 k to 150 k
0.6 W
(not exceed 0.4 W
per element)
0.3 W
(not exceed 0.2 W
per element)
RESISTANCE
ELEMENT
VALUE
Temperature coefficient of resistance (TCR)
absolute: ± 2 ppm/°C typical
(- 55 °C to + 125 °C,+ 25 °C ref.)
TCR tracking: 0.5 ppm/°C
Tolerance: absolute and matching to 0.005 %
(50 ppm)
Resistance range: 1 to 150 k per resistive element
Vishay Foil resistors are not restricted to standard
values/ratios; specific “as requested” values/ratios can be
supplied at no extra cost or delivery (e.g. 1K2345 vs. 1K)
Power rating: up to 1 W at 70 °C, for the entire package,
divided proportionally between the two values
Load life ratio stability: < 0.005 % (50 ppm) 1 W at 70 °C
for 2000 h
Maximum working voltage: 350 V
Electrostatic discharge (ESD) up to 25 000 V
Non-inductive, non-capacitive design
Rise time: 1 ns effectively no ringing
Thermal stabilization time < 1 s (nominal value achieved
within 10 ppm of steady state value)
Current noise: 0.010 µVRMS/V of applied voltage (< - 40 dB)
Thermal EMF: 0.05 µV/°C typical
Voltage coefficient: < 0.1 ppm/V
Non-inductive: < 0.08 µH
Non hot spot design
Terminal finish: lead (Pb)-free or tin/lead alloy
Compliant to RoHS directive 2002/95/EC
Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vpgsensors.com
For better performances see VFD244Z (Z-Foil) datasheet
TABLE 2 - MODEL VFD244 SPECIFICATIONS
MODEL
RESISTANCE
VALUES
500 to 150 k
100 to 500
50 to 100
VFD244
25 to 50
10 to 25
ABSOLUTE TCR
(- 55 °C to + 125 °C, + 25 °C ref.)
TYPICAL AND MAX. SPREAD
± 2 ppm/°C ± 2.5 ppm/°C
± 2 ppm/°C ± 3.5 ppm/°C
± 2 ppm/°C ± 4.0 ppm/°C
TOLERANCE
TCR TRACKING (MAX.)
ABSOLUTE
MATCH
SAME VALUES
DIFFERENT VALUES
± 0.005 %
0.005 %
0.5 ppm/°C
1.5 ppm/°C
± 0.005 %
0.01 %
1.0 ppm/°C
2.0 ppm/°C
± 0.01 %
0.02 %
1.5 ppm/°C
2.5 ppm/°C
± 0.01 %
0.02 %
2.0 ppm/°C
3.0 ppm/°C
± 0.02 %
0.04 %
2.5 ppm/°C
3.5 ppm/°C
5 to 10
± 2 ppm/°C ± 4.5 ppm/°C
± 0.05 %
0.05 %
3.0 ppm/°C
4.0 ppm/°C
2 to 5
± 2 ppm/°C ± 5.0 ppm/°C
± 0.1 %
0.1 %
3.5 ppm/°C
4.5 ppm/°C
1 to 2
± 2 ppm/°C ± 6.0 ppm/°C
± 0.5 %
0.2 %
4.0 ppm/°C
5.0 ppm/°C
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63175
Revision: 5-Mar-15
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
1
VFD244
INTRODUCTION
Today, designers of analog circuits are demanding voltage
dividers that approach the ideal in Performance … stable,
high speed, high accuracy components that will operate with
assured, predictable reliability for years in a variety of
environments. Vishay Foil Resistors (VFR) is meeting those
demands with the VFD244 of unequalled performance. VFR
also adds the dimensions of convenience and economy to
resistors needs. Our long experience relieves the circuit
designer of the complicated, costly and wasteful procedure
of calculating the value of individual resistor components,
ordering and then stabilizing, aging or matching these units,
and literally assembling and testing his own resistor arrays.
The VFR approach to dividers is simple and straight forward,
our solution consists of any combination of resistors, and the
end result is what matters. As a consequence, the only data
VFR requires is the overall electrical performance
specifications, the environment operational, and the desired
physical requirements.
These four fundamental factors determine how “ideal” a
precision divider resistor will be:
1. Initial absolute resistance value or how closely the
absolute resistance value can be achieved
2. How precisely the value of individual resistors can be
controlled
3. How precisely the end of life tolerance is maintained
under a wide range of operating conditions and stress
factors (temperature, humidity, load, etc.)
4. Fast response without ringing and fast thermal
stabilization - and the ability of the resistor to react to rapid
switching without adversely affecting the circuit function.
Until the development of Vishay Foil resistors, precise
control of all four factors was virtually impossible. Vishay
Foil resistors are designed and manufactured to eliminate
the inter-parameter compromise inherent in all other types
of resistors. All important characteristics: tolerance, long
term stability, temperature coefficient, power coefficient,
ESD, noise, capacitance and inductance – are optimized,
approaching the theoretical ideal in total performance.
Resistor technologies before the development of Bulk
Metal® Foil resistors all compromised the theoretical ideal
performance in one or more ways. For example, the
winding of wire and the evaporation or the sputtering of
extremely thin metal each produce metallurgical changes
in the resistance materials and these noticeably
deteriorate the electrical characteristics. Such changes
are not predictable, and thus randomly alter performance
parameters. The form factor of other units also introduces
losses in high frequency performance, limits power
dissipation and prohibits size reduction.
Our application engineering department is available to
advise and make recommendations. For non-standard
technical requirements and special applications. Please
contact us.
FIGURE 1 - 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
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Document Number: 63175
Revision: 5-Mar-15
VFD244
FIGURE 2 - STANDARD PRINTING AND DIMENSIONS in millimeters (inches)
Model VFD244 and Schematic (2)
3.5
(0.138)
VFR
10.5
VFD244
(D.C.) (0.413)
Match
Tolerance
(R2)
(Tol.)
(R1)
8.9
(0.350)
1
0.3
(0.012)
R1
R2
R1 Indicator
19.05 Min. (1)
(0.75 Min.)
1
2
1
Ø 0.6
(0.024)
3
3
2
2
3
1
Dimensional Tolerance: ± 0.2 (0.008)
2.54 (0.100)
(1)
(2)
Lead wires: #22 AWG solder coated copper
Each resistor contains 2 chips of two resistive elements
FIGURE 3 - POWER DERATING CURVE
VFD244
Percent of Rated Power at + 70 °C
100 %
- 55 °C
FIGURE 4 - TYPICAL RESISTANCE/
TEMPERATURE CURVE
+ 70 °C
Rated Power
+ 150
+ 100
75 %
ΔR
50 %
- 50
- 100
Recommended
operation for
< 150 ppm ΔR
Δ
after
2000 h
load life
25 %
0
- 75
+ 50
0
R
(ppm)
2 ppm/° C
- 150
- 200
- 55 - 50
- 25
0
+ 25
+ 50
+ 75
+ 100
+ 125
Ambient Temperature (°C)
- 50
- 25
0
+ 25 + 50 + 75 + 100 + 125 + 150 + 175 + 200
Ambient Temperature (°C)
Note
• Power is divided proportionally between the 2 values (see table 1)
Document Number: 63175
Revision: 5-Mar-15
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
3
VFD244
TABLE 3 - GLOBAL PART NUMBER INFORMATION (1)
NEW GLOBAL PART NUMBER: Y0114V0058QT9L (preferred part number format)
DENOTES PRECISION
VCODE
TOLERANCE MATCH
PACKAGING
Y
RESISTANCE
VALUE CODE
V = 0.005 %
T = 0.01 %
Q = 0.02 %
A = 0.05 %
B = 0.1 %
D = 0.5 %
F = 1.0 %
L = bulk pack
Y
0
1
1
4
V
0
0
5
8
PRODUCT CODE
0114 = VFD244
RESISTANCE TOLERANCE
V = ± 0.005 %
T = ± 0.01 %
Q = ± 0.02 %
A = ± 0.05 %
B = ± 0.1 %
D = ± 0.5 %
F = ± 1.0 %
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0114 V0058 Q T 9 L:
TYPE: VFD244
VALUES: 2K/20K
ABSOLUTE TOLERANCE: ± 0.02 %
TOLERANCE MATCH: 0.01 %
TERMINATION: lead (Pb)-free
PACKAGING: bulk pack
Q
T
9
L
CHARACTERISTICS
0 = standard
9 = lead (Pb)-free
1 to 999 = custom
HISTORICAL PART NUMBER: VFD244T 2K/20K TCR2 Q T B (will continue to be used)
VFD244
T
2K/20K
TCR2
Q
T
B
MODEL
TERMINATION
OHMIC VALUE
TCR
CHARACTERISTIC
VFD244
T = lead (Pb)-free
None = tin/lead alloy
R1 = 2 k
R2 = 20 k
ABSOLUTE
TOLERANCE
V = ± 0.005 %
T = ± 0.01 %
Q = ± 0.02 %
A = ± 0.05 %
B = ± 0.1 %
D = ± 0.5 %
F = ± 1.0 %
TOLERANCE
MATCH
V = 0.005 %
T = 0.01 %
Q = 0.02 %
A = 0.05 %
B = 0.1 %
D = 0.5 %
F = 1.0 %
PACKAGING
B = bulk pack
Note
(1)
For non-standard requests, please contact application engineering
www.vishayfoilresistors.com
4
For any questions, contact
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Document Number: 63175
Revision: 5-Mar-15
Legal Disclaimer Notice
Vishay Precision Group, Inc.
Disclaimer
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not limited to, the warranty expressed therein.
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Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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