Document Number: 63009 For any questions, contact: foil@vishay.com www.vishay.com
Revision: 08-Jan-09 1
VSR Series
Vishay Foil Resistors
Bulk Metal® Foil Technology Industrial Precision Resistors
with TCR of ± 4 ppm/°C and Tolerance of ± 0.01 %
INTRODUCTION
Bulk Metal® Foil technology out performs all other resistor
technologies available today for applications that require
high precision and high stability.
This technology has been pioneered and developed by
VISHAY, and products based on this technology are the
most suitable for a wide range of applications.
Generally Bulk Metal Foil technology allows us to produce
customer orientated products designed to satisfy challenging
and specific technical requirements.
The VSR series of resistors is a low cost version of the well
established S series of resistors. These resistors are made
of foil elements so all of the inherent performance of foil is
retained. They do not however, have the same TCR or
tolerance ranges (see table 1 for details). These products
find a wide range of usage in high end stereo equipment and
some grades of test and measurement equipment.
Standoffs are dimensioned to provide a minimum lead
clearance of 0.010" between the resistor body and the
printed circuit board, when the standoffs are seated on the
board. This allows for proper cleaning after the soldering
process.
Our applications engineering department is available to
advise and to make recommendations for non standard
technical requirements and special applications, please
contact us.
FEATURES
•Temperature coefficient of resistance (TCR) (1):
± 4 ppm/°C (0 °C to + 60 °C)
± 8 ppm/°C (- 55 °C to + 125 °C, + 25 °C ref.)
•Resistance range: 0.5 Ω to 1 MΩ (higher or lower
values of resistance are available)
•Vishay Foil resistors are not restricted to standard values,
we can supply specific “as required” values at no extra cost
or delivery (e.g. 1K2345 vs. 1K)
•Tolerance: to ± 0.01 % (100 ppm)
•Load life stability: to ± 0.005 % at 70 °C, 2000 h at rated
power
•Electrostatic discharge up to 25 000 V
•Non inductive, non capacitive design
•Rise time: 1 ns effectively no ringing
•Current noise: - 40 dB
•Thermal EMF: 0.05 µV/°C typical
•Voltage coefficient: < 0.1 ppm/V
•Inductance: 0.08 µH
•Matched sets available
•Terminal finish: lead (Pb)-free
tin/lead alloy
•Prototype samples available from 72 h. For more
information, please contact foil@vishay.com
•For better performances please review the S Series
datasheet
Note
(1) For values below 50 Ω please contact application engineering
APPLICATIONS
•Industrial
•Medical
•Audio (high end stereo equipment)
•Test and measurement equipment
•Precision amplifiers
* Pb containing terminations are not RoHS compliant, exemptions may apply
FIGURE 1 - POWER DERATING CURVE
200 %
175 %
150 %
125 %
100 %
75 %
50 %
25 %
0
- 75 - 50 - 25 0 + 25 + 50 + 75 + 100 + 125 + 150 + 175 + 200
Ambient Temperature (°C)
Percent of Rated Power at + 125 °C
- 55 °C + 70 °C
Double Rated Power
Rated Power
∆
Safe operation
for < 150 ppm
R after 2000
hours load-life.
FIGURE 2 - TRIMMING TO VALUES
(Conceptual Illustration)
Mutual Inductance
Reduction due
to Change in
Current Direction
Current Path
Before Trimming
Note: Foil shown in black, etched spaces in white
Interloop Capacitance
Reduction in Series
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
Current Path
After Trimming
VSR Series
Vishay Foil Resistors
www.vishay.com For any questions, contact: foil@vishay.com Document Number: 63009
2Revision: 08-Jan-09
Note
(1) 0.200" (5.08 mm) lead spacing available - specify VSRJ.
FIGURE 3 - IMPRINTING AND DIMENSIONS
LS
Model Number
VISHAY
XXXX
VSR4
ST
H
L
Date Code
W
Front View
Lead Material #22 AWG
Round Solder Coated Copper
10
Week
07
Year
Rear View
Resistance
Value Code
Tolerance
100R01
0.01 %
LL
SW
TABLE 1 - MODEL SELECTION
MODEL
NUMBER
RESISTANCE
(
Ω
)
POWER
at
+ 70 °C
POWER
at
+ 125 °C
MAXIMUM
WORKING
VOLTAGE
DIMENSIONS LOAD LIFE
STABILITY
(MAXIMUM
Δ
R)
MAXIMUM
TEMPERATURE
COEFFICIENT
OF RESISTANCE
(+ 25 °C REF.)
TIGHTEST
TOLERANCE %
VS. LOWEST
RESISTANCE
VALUE (
Ω
)
INCHES mm
VSR
1 to 150K 0.3 W 0.2 W 300 W: 0.105 ± 0.010
L: 0.300 ± 0.010
H: 0.326 ± 0.010
ST: 0.010 minimum
SW: 0.040 ± 0.005
LL: 1.000 ± 0.125
LS: 0.150 ± 0.005
1)
2.67 ± 0.25
7.62 ± 0.25
8.28 ± 0.25
0.254 minimum
1.02 ± 0.13
25.4 ± 3.18
3.81 ± 0.13
0.05 %
2000 hours
at + 125 °C
0 °C to + 60 °C
± 4 ppm/°C
- 55 °C to + 125 °C
± 8 ppm/°C
± 0.01/50
± 0.02/30
± 0.05/5
± 0.1/2
± 0.5/1
up to 100K
VSRJ
(1).
0.25 W 0.15 W
over 100K
VSR4
1 to 500K 0.5 W 0.4 W 350 W: 0.160 maximum
L: 0.575 maximum
H: 0.413 maximum
ST: 0.035 ± 0.005
SW: 0.050 ± 0.005
LL: 1.000 ± 0.125
LS: 0.400 ± 0.020
4.06 maximum
14.61 maximum
10.49 maximum
0.89 ± 0.13
1.27 ± 0.13
25.4 ± 3.18
10.16 ± 0.51
± 0.005/100
± 0.01/50
± 0.02/30
± 0.05/5
± 0.1/2
± 0.5/1
up to 200K
0.25 W 0.2 W
over 200K
VSR5
1 to 750K 0.75 W 0.6 W 350 W: 0.160 maximum
L: 0.820 maximum
H: 0.413 maximum
ST: 0.035 ± 0.005
SW: 0.050 ± 0.005
LL: 1.000 ± 0.125
LS: 0.650 ± 0.020
4.06 maximum
20.83 maximum
10.49 maximum
0.89 ± 0.13
1.27 ± 0.13
25.4 ± 3.18
16.51 ± 0.51
up to 300K
0.4 W 0.3 W
over 300K
VSR6
0.5 to 1M 1.0 W 0.8 W 500 W: 0.260 maximum
L: 1.200 maximum
H: 0.413 maximum
ST: 0.035 ± 0.005
SW: 0.050 ± 0.005
LL: 1.000 ± 0.125
LS: 0.900 ± 0.020
6.60 maximum
30.48 maximum
10.49 maximum
0.89 ± 0.13
1.27 ± 0.13
25.4 ± 3.18
22.86 ± 0.51
up to 400K
0.5 W 0.4 W
over 400K
FIGURE 4 - TEMPERATURE COEFFICIENT OF RESISTANCE
+ 400
+ 200
0
- 200
- 4000 + 25
- 140
Temperature, °C
+ 140
+ 100
- 100
ΔR
R
(ppm)
+ 60
+ 4 ppm/°C
- 4 ppm/°C
Document Number: 63009 For any questions, contact: foil@vishay.com www.vishay.com
Revision: 08-Jan-09 3
VSR Series
Vishay Foil Resistors
Note
(1) For non-standard requests, please contact application engineering.
TABLE 2 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y0075100K250A9L (preferred part number format)
DENOTES PRECISION VALUE CHARACTERISTICS (1)
YR = Ω
K = kΩ
M = MΩ
0 = standard
9 = lead (Pb)-free
1 - 999 = custom
PRODUCT CODE RESISTANCE TOLERANCE PACKAGING
0075 = VSR
0789 = VSRJ
0020 = VSR4
0021 = VSR5
0022 = VSR6
T= ± 0.01 %
Q= ± 0.02 %
A= ± 0.05 %
B= ± 0.1 %
C= ± 0.25 %
D= ± 0.5 %
F= ± 1.0 %
L = bulk pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0075 100K250 A 9 L:
TYPE: VSR
VALUE: 100.25 kΩ
ABSOLUTE TOLERANCE: ± 0.05 %
TERMINATION: lead (Pb)-free
PACKAGING: bulk pack
HISTORICAL PART NUMBER EXAMPLE: VSRT 100K25 A B (will continue to be used)
VSR T 100K25 A B
MODEL TERMINATION OHMIC VALUE RESISTANCE
TOLERANCE PA C K A G I N G
VSR
VSRJ
VSR4
VSR5
VSR6
T = lead (Pb)-free
None = tin/lead alloy
100.25 kΩT= ± 0.01 %
Q= ± 0.02 %
A= ± 0.05 %
B= ± 0.1 %
C= ± 0.25 %
D= ± 0.5 %
F= ± 1.0 %
B = bulk pack
0751 0K20Y0 A95 L0
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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Vishay
All product specifications and data are subject to change without notice.
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(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
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The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
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