IMPROVED PRODUCT
Bulk Metal
®
Foil Technology High Precision 4-Terminal Power
Current Sensing Resistors with TCR as low as ± 1 ppm/°C Maximum,
Tolerance ± 0.1 % and Rise Time 1.0 ns Effectively No Ringing
VCS331, VCS332
Vishay Foil Resistors
Document Number: 63153 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 29-Mar-10 1
INTRODUCTION
The VCS331 and VCS332 offer precision Bulk Metal® Foil
technology resistors as low as 0.25 with a temperature
coefficient down to 1 ppm/°C maximum and unmatched long
term stability. The 4 terminal current sensing resistors, when
mounted on a heat sink, can sustain 10 W continuously
without an appreciable change in resistance (0.15 %
maximum). The typical 50 % power derating specification
associated with other technologies is not necessary. A
choice of lead configurations is available.
Our application engineering department is available to
advise and make recommendations. For non-standard
technical requirements and special applications, please
contact us.
FEATURES
Temperature coefficient of resistance (TCR):
down to ± 1 ppm/°C max. (see table 2)
Tolerance: to ± 0.1 % (see table 1)
Power rating (heat-sinked): 10 W
Load life stability: ± 0.01 % (100 ppm) at 25 °C,
2000 h at rated power
Resistance range: 0.25 to 500
Vishay Foil resistors are not restricted to standard
values; specific “as required” values can be supplied
at no extra cost or delivery (e.g. 1R2345 vs. 1R)
Electrostatic discharge (ESD) up to 25 000 V
Non-inductive, non-capacitive design
Rise time: 1.0 ns effectively no ringing
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
Thermal stabilization time < 1 s (nominal value achieved
within 10 ppm of steady state value)
Terminal finish: lead (Pb)-free or tin/lead alloy
Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vishaypg.com
For better performances, please contact application
engineering
Notes
(1) Tighter tolerance is available - for more details contact application engineering
(2) The lower of the two limitations (power or current) is decisive
(3) Heatsink - aluminum (6" length x 4" width x 2" height x 0.04" thick)
* Pb containing materials are not RoHS compliant, exemptions may apply
TABLE 1 - CHARACTERISTICS
MODEL NUMBER RESISTANCE RANGE BEST TOLERANCE (1) POWER RATING (2)
at + 25 °C MAXIMUM CURRENT (2)
VCS331, VCS332 0.25 < R < 500 ± 0.1 % 10 W on heat sink (3)
or 3 W in free air 5 A
TABLE 2 - TCR CHART (maximum)
(0 °C TO + 60 °C)
0.25 to < 1 ± 3 ppm/°C
1 to < 10 ± 2 ppm/°C
10 to < 500 ± 1 ppm/°C
FIGURE 1 - POWER DERATING CURVE
(Further Derating Not Necessary)
+ 100
+ 75
+ 50
+ 25
0
Ambient Temperature °C
Percent of
Rated Power
- 55 °C + 25 °C
- 50 + 50
0+ 100 + 150 + 200
IMPROVED PRODUCT
VCS331, VCS332
Vishay Foil Resistors
www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63153
2Revision: 29-Mar-10
FIGURE 2 - TRIMMING TO VALUES
(conceptual illustration)
FIGURE 3- DIMENSIONS in inches (millimeters) AND SCHEMATIC
Model VCS331 (E Lead Rectangular) Model VCS332 (Round Leads)
MODEL
L1
± 0.008
(± 0.20)
L2
± 0.008
(± 0.20)
H1
MAX.
H2
± 0.008
(± 0.20)
W1
MAX.
W2
MAX.
LL
MIN.
LS
± 0.020
(± 0.51)
LT
± 0.020
(± 0.51)
D1
NOM.
D2
NOM.
P
NOM.
T
NOM.
VCS331 1.340
(34.04)
0.701
(17.81)
1.063
(27.00)
0.197
(5.00)
0.210
(5.33)
0.087
(2.21)
0.216
(5.49)
0.689
(17.50)
1.083
(27.51)
0.138
(3.51)
0.040
(1.02)
0.040
(1.02)
0.016
(0.41)
VCS332 1.340
(34.04)
0.701
(17.81)
1.024
(26.01)
0.197
(5.00)
0.210
(5.33)
0.087
(2.21)
1.000
(25.40)
0.689
(17.50)
1.083
(27.51)
0.138
(3.51)
0.040
(1.02)
0.032
(0.81) -
Note: Foil shown in black, etched spaces in white
Mutual
Inductance
Reduction due
to Opposing
Current in
Adjacent Lines
Current Path
Before Trimming
Interloop
Capacitance
Reduction
in Series
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing Resistance
Current Path
After Trimming
VISHAY
VCS331
0R3000 1%
B9825
VISHAY
VCS332
8R2000 0.1%
B9825
D1
D2
L1
L2
H1
H2
W1
W2
LL
LS
LT
p
D1
D2
L1
L2
H1
H2
W1
W2
LL
LS
LT
pT
I
1
E
1
I
2
E
2
I
V
IR
IMPROVED PRODUCT
VCS331, VCS332
Vishay Foil Resistors
Document Number: 63153 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 29-Mar-10 3
Notes
(1) R’s plus additional 0.0005 for measurement error
Note
(1) For non-standard requests, please contact application engineering
TABLE 3 - VISHAY VCS331, VCS332 PERFORMANCE
TEST OR CONDITION VCS331, VCS332 PERFORMANCE (1)
TYPICAL R LIMITS MAXIMUM R LIMITS
Thermal Shock 0.01 % 0.02 %
Short Time Overload (5 x rated power for 5 s) 0.01 % 0.02 %
Terminal Strength 0.02 % 0.05 %
High Temperature Exposure (2000 h at + 150 °C) 0.02 % 0.05 %
Moisture Resistance 0.03 % 0.05 %
Low Temperature Storage (24 h at - 55 °C) 0.005 % 0.01 %
Shock (specified pulse) 0.01 % 0.02 %
Vibration (high frequency) 0.01 % 0.02 %
Load Life (rated power, + 25 °C, 2000 h) 0.01 % 0.02 %
Resistance Tolerance 0.1 % 1 %
Thermal EMF 0.2 µV/°C max. (E terminal)
Weight 8.1 g maximum
TABLE 4 - GLOBAL PART NUMBER INFORMATION (1)
NEW GLOBAL PART NUMBER: Y09600R25000B9L (preferred part number format)
DENOTES PRECISION VALUE CHARACTERISTICS
YR = 0 = standard
9 = lead (Pb)-free
1 to 999 = custom
PRODUCT CODE RESISTANCE TOLERANCE PACKAGING
0960 = VCS331
0944 = VCS332
B= ± 0.1 %
D= ± 0.5 %
F= ± 1.0 %
G= ± 2.0 %
J= ± 5.0 %
L = bulk pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0960 0R25000 B 9 L:
TYPE: VCS331
VALUE: 0.25
ABSOLUTE TOLERANCE: ± 0.1 %
TERMINATION: lead (Pb)-free
PACKAGING: bulk
HISTORICAL PART NUMBER: VCS331T 0R2500 B B (will continue to be used)
VCS331 T 0R2500 B B
MODEL TERMINATION RESISTANCE VALUE TOLERANCE PACKAGING
VCS331
VCS332
T = lead (Pb)-free
None = tin/lead alloy
0.25 B= ± 0.1 %
D= ± 0.5 %
F= ± 1.0 %
G= ± 2.0 %
J= ± 5.0 %
B = Bulk Pack
9600 250RY0 B90 L0
Vishay Precision Group
Document No.: 63999
Revision: 27-Apr-11
www.vishaypg.com
1
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Document No.: 63999
Revision: 27-Apr-11
