VCS1610 (Kelvin Connection)
Vishay Foil Resistors
High Precision Foil Surface Mount Current Sensing Chip
Resistors with TCR of ± 2 ppm/°C, Load Life Stability of ± 0.02 %,
ESD Immunity up to 25 kV and Fast Thermal Stabilization
FEATURES
Temperature coefficient of resistance (TCR):
± 2.0 ppm/°C typical (- 55 °C to + 125 °C,
+ 25 °C ref.) (see table 1)
Tolerance: to ± 0.5 %
Load life stability:
± 0.02 % at 70 °C, 2000 h at rated power
Power rating: 0.25 W at + 70 °C
Resistance range: 0.1
to 1
(for higher or lower
values please contact Vishay application engineering
department)
Vishay Foil resistors are not restricted to standard values;
specific “as required” values can be supplied at no extra
cost or delivery (e.g. 0.2345
vs. 0.2
)
Electrostatic discharge (ESD) up to 25 000 V
Thermal stabilization time < 1 s
Short time overload
0.005 %
Non-inductive, non-capacitive design
Thermal EMF: 0.05 µV/°C typical
Current noise: < - 42 dB
Rise time: 1 ns effectively no ringing
Voltage coefficient: < 0.1 ppm/V
Non inductive: < 0.08 µH
Weight: 0.027 mg
Compliant to RoHS directive 2002/95/EC
Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vishaypg.com
For improved performances, please see VCS1610Z
TERMINATIONS
Two lead (Pb)-free options are available:
Gold plated or tin plated
Tin/lead plated
TABLE 1 - TOLERANCE AND TCR VS.
RESISTANCE VALUE
(- 55 °C to + 125 °C, + 25° Ref.)
VALUE
()
0R5 to 1R
0R1 to 0R5
Note
TOLERANCE
0.5 %, 1 %
0.5 %, 1 %
TYPICAL
TCR
± 2 ppm/°C
± 2 ppm/°C
MAXIMUM
TCR
± 10 ppm/°C
± 15 ppm/°C
• Tighter tolerances and higher values are available. Please
contact application engineering
foil@vishaypg.com
INTRODUCTION
Why should I use the VCS1610?
The VCS1610 is a current sensing solution that was
developed with a low TCR to meet demands for new and
stable resistive product solutions in the industry today. This
resistor is most-often used to monitor a current that is directly
proportional to some physical characteristic (such as
pressure, weight, etc) being measured by an analog sensor.
The resistor converts the current to a voltage that is
representative of the physical characteristic and feeds that
voltage into control circuits, instrumentation, or other
indicators.
Variations induced in the resistor, not representative of the
monitored characteristic, can be caused by high TCR
response to both ambient temperature and self-heating and
can feed erroneous signals into the system. Resistance is
usually kept low to reduce the I²R self-heating (Joule effect)
portion of the error while minimizing the stresses that cause
long-term resistance changes. It is critical for this resistor to
reach thermal equilibrium quickly in circuits that require fast
response or where the current changes quickly.
The VCS1610 is used where the emphasis is on accuracy
and repeatability under stress conditions in applications
requiring precision resistor performance up to 0.25 W and up
to 70 °C. Applications as EB systems, switching power
supplies, force-balanced scales all rely on current sense
resistors to develop a precise voltage proportional to the
current. The VCS1610 is a four terminal resistor which is
essential to achieve high accuracy and stability.
Why use Kelvin connections?
Four-terminal connections or Kelvin connections are
required in these low ohmic value resistors to measure a
precise voltage drop across the resistive element. The
4-terminal configuration eliminates the IR-drop error voltage
that would be present in the voltage sense leads if a standard
two-terminal resistor were used.
In current sense resistors the contact resistance and the
terminations resistance may be greater than that of the
resistive element itself so lead connection errors can be
significant if only two terminal connections are used.
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63137
Revision: 25-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
1
VCS1610 (Kelvin Connection)
Vishay Foil Resistors
Why is the VCS1610 vital to avoid Thermal EMF
(parasitic effect)?
When the junction of two dissimilar metals is heated, a
voltage is generated across the junction creating a DC-offset
error signal. This voltage is proportional to the temperature
difference across the junction and is called a Thermal
Electro-motive Force (Thermal EMF), or thermocouple.
Thermal EMF is an important consideration in low ohmic
current sensing resistors used mostly in DC circuits (there is
no effect in AC circuitry). The VCS1610 is the ideal solution
to minimize the effect of thermal EMF through the use of
appropriate materials between the resistive layer and the
terminations.
Should I be concerned about ESD impact on my
resistor?
Electrostatic Discharge (ESD) is known to produce
catastrophic failures in thin-film and thick-film (cermet)
resistors at only 3000 V. On the other hand, the Bulk Metal
Foil resistor withstands ESD events up to 25 000 V because
its thicker resistance element and greater metallic mass
afford much higher energy-handling capability than either the
much thinner thin-film resistor or the sparse,
non-homogeneous metallic content of the thick film resistor.
Should I be concerned about stability?
In order to select the resistor technology most appropriate to
the application, a designer must take into account all normal
and extraordinary stresses the resistor will experience in the
application. In addition, the designer must consider the cost
and reliability impact involved when it becomes necessary to
add costly additional compensating circuitry when
inadequate resistors are selected. The stability of Bulk Metal
Foil resistors, together with the advantages already
mentioned, as well as the other basic advantages apparent
in their specifications will not only provide unequalled
performance in the circuit but will eliminate all the costs
associated with extra compensation circuitry.
With VCS1610, only a minimal shift in resistance value will
occur during its entire lifetime. Most of this shift takes place
during the first few hundred hours of operation, and virtually
no change is noted thereafter.
FIGURE 1 - POWER DERATING CURVE
(1)
Percent of Rated Power
- 55 °C
100
75
50
25
0
- 75
+ 70 °C
- 50
- 25
0
+ 25
+ 50
+ 75 + 100 + 125 + 150 + 175
Ambient Temperature (°C)
Note
(1)
Power rating: 0.25 W at + 70 °C
FIGURE 2 - DIMENSIONS
in inches (millimeters)
L
Mounting
Pads (4)
I
2
0.110
(2.794)
A
E
1
0.020
(0.508)
0.060
(1.524)
I
1
R
E
2
B
H
W
E
2
I
1
0.200
(5.08)
E
1
I
2
Top View
Bottom View
INCHES
Solder Pad Layout
MILLIMETERS
4.06 ± 0.25
2.54 ± 0.25
1.02 maximum
1.14 ± 0.13
0.76 ± 0.25
Electrical Schematic
L
H
W
A
B
0.160 ± 0.010
0.100 ± 0.010
0.040 maximum
0.045 ± 0.005
0.030 ± 0.010
www.foilresistors.com
2
For any questions, contact:
foil@vishaypg.com
Document Number: 63137
Revision: 25-Mar-10
VCS1610 (Kelvin Connection)
Vishay Foil Resistors
FIGURE 3 - TYPICAL RESISTANCE/TEMPERATURE CURVE
+ 150
+ 100
+ 50
± 2 ppm/°C (+ 25 °C Reference)
0
Δ
R
R
(ppm)
- 50
- 100
- 150
- 200
- 50
- 25
0
+ 25
+ 50
+ 75
+ 100
+ 125
Ambient Temperature (°C)
TABLE 2 - PERFORMANCE SPECIFICATIONS
TEST
Thermal Shock 5 x (- 65 °C to + 150 °C)
Low Temperature Operation
Short Time Overload
High Temperature Exposure
Resistance to Soldering Heat
Moisture Resistance
Load Life 2000 h at 70 °C
Note
• Measurement error 0.001 R
MIL-PRF-55342
R
LIMITS
± 0.10 %
± 0.10 %
± 0.10 %
± 0.10 %
± 0.2 %
± 0.2 %
± 0.5 %
TYPICAL
R
LIMITS
± 0.005 % (50 ppm)
± 0.005 % (50 ppm)
± 0.005 % (50 ppm)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.02 % (200 ppm)
TABLE 3 - GLOBAL PART NUMBER INFORMATION
(1)
NEW GLOBAL PART NUMBER: Y11200R40500D9W (preferred part number format)
DENOTES PRECISION
Y
VALUE
R
=
CHARACTERISTICS
0
= tin/lead plated
9
= tin plated
19
= gold plated
1 to 999
= custom
Y
1
1
2
0
0
R
4
0
5
0
0
D
9
W
PRODUCT CODE
1120
= VCS1610
RESISTANCE TOLERANCE
D
F
G
J
K
= ± 0.5 %
= ± 1.0 %
= ± 2.0 %
= ± 5.0 %
= ± 10.0 %
PACKAGING
W
= waffle pack
R
= tape and reel
FOR EXAMPLE: ABOVE GLOBAL ORDER Y1120 0R40500 D 9 W:
TYPE: VCS1610
VALUES: 0.405
ABSOLUTE TOLERANCE: ± 0.5 %
TERMINATION: lead (Pb)-free
PACKAGING: waffle pack
Note
(1)
For non-standard requests or additional values, please contact application engineering.
Document Number: 63137
Revision: 25-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
3
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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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