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)
D
(D 24
4
.C
.)
VF
VF
FEATURES
R
APPLICATIONS
Instrumentation amplifiers
Bridge networks
Differential amplifiers
Military
Space
Medical
Automatic test equipment
Down-hole (high temperature)
V
in
R
1
-
+
R
2
V
out
VFD244
VFD244Z
TABLE 1 - RATED POWER PER ELEMENT
RESISTANCE
ELEMENT
VALUE
1
to < 100 k
MAXIMUM POWER
RATING AT 70 °C
PER ENTIRE
PACKAGE
1W
(not exceed 0.6 W
per element)
0.6 W
(not exceed 0.4 W
per element)
MAXIMUM POWER
RATING AT 125 °C
PER ENTIRE
PACKAGE
0.5 W
(not exceed 0.3 W
per element)
0.3 W
(not exceed 0.2 W
per element)
100 k to 150 k
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 µV
RMS
/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
5
to 10
2
to 5
1
to 2
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
± 2 ppm/°C ± 4.5 ppm/°C
± 2 ppm/°C ± 5.0 ppm/°C
± 2 ppm/°C ± 6.0 ppm/°C
TOLERANCE
ABSOLUTE
± 0.005 %
± 0.005 %
± 0.01 %
± 0.01 %
± 0.02 %
± 0.05 %
± 0.1 %
± 0.5 %
MATCH
0.005 %
0.01 %
0.02 %
0.02 %
0.04 %
0.05 %
0.1 %
0.2 %
TCR TRACKING (MAX.)
SAME VALUES
0.5 ppm/°C
1.0 ppm/°C
1.5 ppm/°C
2.0 ppm/°C
2.5 ppm/°C
3.0 ppm/°C
3.5 ppm/°C
4.0 ppm/°C
DIFFERENT VALUES
1.5 ppm/°C
2.0 ppm/°C
2.5 ppm/°C
3.0 ppm/°C
3.5 ppm/°C
4.0 ppm/°C
4.5 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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2
For any questions, contact
foil@vpgsensors.com
Document Number: 63175
Revision: 5-Mar-15
VFD244
FIGURE 2 - STANDARD PRINTING AND DIMENSIONS
in millimeters (inches)
Model VFD244 and Schematic
(2)
8.9
(0.350)
VFR
10.5
VFD244
(D.C.)
(0.413)
0.3
(0.012)
19.05 Min.
(1)
(0.75 Min.)
3.5
(0.138)
Match
Tolerance
(R
2
)
(Tol.)
(R
1
)
R
1
R
2
1
R1 Indicator
1
2
3
1
2
3
Ø 0.6
(0.024)
3
2
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
100 %
FIGURE 4 - TYPICAL RESISTANCE/
TEMPERATURE CURVE
+ 150
+ 100
- 55 °C
+ 70 °C
Rated Power
Percent of Rated Power at + 70 °C
75 %
Δ
R
50 %
+ 50
0
R
(ppm)
- 50
25 %
Recommended
operation for
< 150 ppm
ΔR
Δ
after 2000 h
load life
- 100
- 150
- 200
- 55 - 50
- 25
0
+ 25
+ 50
+ 75
+ 100
2 ppm/
°
C
+ 125
0
- 75
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
Y
VCODE
RESISTANCE
VALUE CODE
TOLERANCE MATCH
V
= 0.005 %
T
= 0.01 %
Q
= 0.02 %
A
= 0.05 %
B
= 0.1 %
D
= 0.5 %
F
= 1.0 %
PACKAGING
L
= bulk pack
Y
0
1
1
4
V
0
0
5
8
Q
T
9
L
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
HISTORICAL PART NUMBER: VFD244T 2K/20K TCR2 Q T B (will continue to be used)
VFD244
MODEL
VFD244
T
TERMINATION
T
= lead (Pb)-free
None
= tin/lead alloy
2K/20K
OHMIC VALUE
R
1
= 2 k
R
2
= 20 k
TCR2
TCR
CHARACTERISTIC
Q
ABSOLUTE
TOLERANCE
V
= ± 0.005 %
T
= ± 0.01 %
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.1 %
D
= ± 0.5 %
F
= ± 1.0 %
PRODUCT CODE
0114
= VFD244
CHARACTERISTICS
0
= standard
9
= lead (Pb)-free
1 to 999
= custom
T
TOLERANCE
MATCH
V
= 0.005 %
T
= 0.01 %
Q
= 0.02 %
A
= 0.05 %
B
= 0.1 %
D
= 0.5 %
F
= 1.0 %
B
PACKAGING
B
= bulk pack
Note
(1)
For non-standard requests, please contact application engineering
www.vishayfoilresistors.com
4
For any questions, contact
foil@vpgsensors.com
Document Number: 63175
Revision: 5-Mar-15
Legal Disclaimer Notice
Vishay Precision Group, Inc.
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(collectively, “VPG”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in
any other disclosure relating to any product.
The product specifications do not expand or otherwise modify VPG’s terms and conditions of purchase, including but
not limited to, the warranty expressed therein.
VPG makes no warranty, representation or guarantee other than as set forth in the terms and conditions of purchase.
To the maximum extent permitted by applicable law, VPG disclaims (i) any and all liability arising out of the
application or use of any product, (ii) any and all liability, including without limitation special, consequential or
incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular purpose,
non-infringement and merchantability.
Information provided in datasheets and/or specifications may vary from actual results in different applications and
performance may vary over time. Statements regarding the suitability of products for certain types of applications
are based on VPG’s knowledge of typical requirements that are often placed on VPG products. It is the customer’s
responsibility to validate that a particular product with the properties described in the product specification is suitable for
use in a particular application. You should ensure you have the current version of the relevant information by contacting
VPG prior to performing installation or use of the product, such as on our website at vpgsensors.com.
No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or by any
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The products shown herein are not designed for use in life-saving or life-sustaining applications unless otherwise
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Please contact authorized VPG personnel to obtain written terms and conditions regarding products designed for such
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Product names and markings noted herein may be trademarks of their respective owners.
Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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