CSM2512S
Bulk Metal
®
Technology High Precision, Current Sensing, Power Surface
Mount, Metal Strip Resistor with Improved Stability 0.05 %, Resistance
Value from 10 m, Rated Power to 1 W and TCR to 0 ± 15 ppm/°C
FEATURES
Temperature coefficient of resistance (TCR):
(- 55 °C to + 125 °C, + 25 °C ref.)
± 15 ppm/°C maximum
± 10 ppm/°C maximum on special request
Load life stability to ± 0.05 % (70 °C, 2000 h
at rated power)
Power rating: 1 W
Resistance tolerance: ± 0.1 %
Resistance range: 10 m to 100 m
Vishay Foil resistors are not restricted to standard values,
we can supply specific “as required” values at no extra cost
or delivery (e.g. 10.2345 m vs. 10 m)
Short time overload: ± 0.1 % typical
Thermal EMF: < 3 µV/°C
Maximum current: up to 10 A
Surface mount configuration
Four terminal (Kelvin) design: allows for precision accurate
measurements
Terminal finishes available: lead (Pb)-free, tin/lead alloy
Screening in accordance with EEE-INST002 available
(Per MIL-PRF-55342 and MIL-PRF-49465; see
datasheets of 303144 and 303145 )
Prototype quantities available in just 5 working days or
sooner. For more information, please contact
foil@vpgsensors.com
For better performances please contact Application
Engineering
The CSM’s series of low value current sense resistors
provides power and precision in a four terminal, surface
mount configuration. Its all welded construction is made
up of a Bulk Metal
®
resistive element with plated copper
terminations.
Vishay Foil Resistors’ application engineering department is
available to advise and make recommendations.
For non-standard technical requirements and special
applications, please contact
foil@vpgsensors.com.
B
I
A
Zin
R
C
I
D
FIGURE 1 - POWER DERATING CURVE
+ 70 °C
100
~
∞
=
V
Rated Power (%)
80
60
40
20
0
- 65 - 50
- 25
0
25
50
75
100
125
150
170
Ambient Temperature (°C)
TABLE 1 - PERFORMANCE SPECIFICATIONS
PARAMETER
Resistance Range
Power Rating at 70 °C
Maximum Current
Maximum Working Voltage
Tightest Tolerance
Temperature Coefficient Maximum (- 55 °C to + 125 °C, + 25 °C ref.)
Operating Temperature Range
Weight (maximum)
* Pb containing terminations are RoHS compliant, exemptions may apply
Document Number: 63145
Revision: 4-Mar-15
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
1
CSM2512S
10 m to 100 m
1W
10 A
(P x R)
1/2
± 0.1 %
± 15 ppm/°C, ± 10 ppm/°C is available
- 65 °C to + 170 °C
0.09 g
CSM2512S
ABOUT CSM
(Low Ohm Value 10 m to 100 m)
The CSM2512S series of low value current sense resistors
provides power and precision in a four terminal, surface
mount configuration. Its all welded construction is made up
of a Bulk Metal
®
resistive element with plated copper
terminations. For low value resistors in precision applications
it is necessary to use four-terminal Kelvin connections to
obtain a precise voltage drop across the resistive element.
In these applications, the contact resistance and the terminal
resistance may have the same order of magnitude or be
even greater than that of the element resistance itself. Thus,
significant error is introduced because the high temperature
coefficient of resistance of the leads and the contact
resistance are unavoidably incorporated into the
measurements when the current sense resistor has only two
leads.
Because the ability to measure low values to tolerances of
0.1% or tighter is a concern to both the manufacturer and the
user, many situations require coordination of measurement
standards between both parties. Coordination is often
accomplished by exchange of serialized units with recorded
readings to align measurement practices and specific
reference standards. The problem is compounded when
high-precision current sensors under moderate to high
power experience self-heating (Joule effect) which causes
the in-service resistance value to be different from that
obtained using low current measurement equipment.
Therefore, the measurement conditions must be defined and
accepted at the time of spec preparation-that is, resistance
value as determined by specified current and measured
IR-drop following a specified period of stabilization.
Measurement equipment is available from a number of
sources with varying stated accuracies. Traditional passive
current sensors and shunts generate heat under power,
which changes their resistance, and thus their voltage
output. The CSM’s low absolute TCR reduces errors due to
temperature gradients, thus reducing a major source of
uncertainty in current measurement. The CSM can withstand
unconventional environmental conditions, including the
extremely
high
temperatures
and
radiation-rich
environments of down-hole oil exploration and well logging,
or the deep-sea underwater repeaters in cross-ocean
communications. The stability of the CSM can be further
enhanced by post-manufacturing operations (PMO), such as
temperature cycling, short-time overload, and accelerated
load life which are uniquely applicable to Bulk Metal
®
Foil
resistors. The device features a low thermal electromotive
force (EMF) that is critical in many precision applications.
Thermal EMF in DC applications induces a voltage offset in
the resistor that is equivalent to adding a small battery into
the circuit.
The CSM’s all-welded construction is a Bulk Metal
®
resistive
element with welded copper terminations, plated for
soldering. The terminations make a true continuous contact
with the resistive layer along the entire side of the resistive
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For any questions, contact
foil@vpgsensors.com
Document Number: 63145
Revision: 4-Mar-15
element, thereby minimizing temperature variations. Also,
the resistor element is designed to uniformly dissipate power
without creating hot spots, and the welded terminations
material is compatible with the element material. These
design factors result in a very low thermal-EMF(<3 µV/°C)
resistor, because in addition to the low thermal EMF
compatibility of the metals, the uniformity and thermal
efficiency of the design minimizes the temperature
differential across the resistor, thereby assuring low thermal
EMF generation at the leads. This further reduces the
“battery effect” exhibited by most current-sensing or
voltage-reference resistors. Thus, the parasitic voltage
generated at the junction of two dissimilar metals, which is
especially important in low-value current-sensing resistors, is
minimized, while the pure current-to-voltage conversion is
protected from such interference in DC applications.
The stability problems associated with analog circuits are
very pervasive, but knowledgeable selection of a few
high-quality resistors, networks, or trimming potentiometers
in critical locations can greatly improve circuit performance,
long-term application-related performance, as well as the
designer’s peace-of-mind. Additionally, the overall system
cost is often reduced when a knowledgeable designer
concentrates costs in a few exceptionally stable components
with minimal deviation and whose load and environmental
stability can often eliminate the necessity of additional
compensating circuitry or temperature-controlling systems.
The higher reliability and better overall system performances
also achieve excellent product results in the field, enhancing
market acceptance and product reputation. Designers often
unnecessarily pay for tighter tolerances than required simply
to accommodate the resistance stability shifts they know to
be imminent in an application due to the large
application-related changes in the components they
selected. Selection of a high-stability component like the
CSM in these applications eliminates the need for shift
allowance due to “planned instability” and allows the use of
looser initial tolerances than would otherwise be necessary.
CSM2512S
FIGURE 2 - DIMENSIONS AND IMPRINTING
in inches (millimeters)
CSM2512S DIMENSIONS
(1)
CSM2512S LAND PATTERN
I
1
e
E
1
E
2
I
2
B
d
b
c
H
L
T
A
W
I
Kelvin Connection
I
1
, I
2
- Current
E
1
, E
2
- Sense
a
DIMENSIONS - TOLERANCES ± 0.010 (± 0.254), * ± 0.015 (± 0.381)
RESISTANCE RANGE ()
0.01 to 0.1
L
0.250 (6.350)
W
0.125 (3.175)
H
0.025 (0.635)
T
0.030 (0.762)
A
0.030 (0.762)*
B
0.032 (0.813)*
LAND PATTERN DIMENSIONS - TOLERANCES ± 0.003 (± 0.076)
RESISTANCE RANGE ()
0.01 to 0.1
l
0.160 (4.06)
b
0.145 (3.68)
e
0.055 (1.39)
a
0.065 (1.65)
c
0.045 (1.14)
d
0.021 (0.53)
Note
(1)
White dots indicate top side of part for mounting purposes
TABLE 2 - CSM2512S PERFORMANCE SPECIFICATIONS
TEST
Thermal Shock
Load Life Stability
Bias Humidity
Short Time Overload
High Temperature Exposure
Low Temperature Storage
Moisture resistance
Shock
Vibration
Resistance to Soldering Heat
Solderability
Document Number: 63145
Revision: 4-Mar-15
CONDITIONS
- 55 °C to + 150 °C, 1000 cycles, 15 min at
each extreme
2000 h, 70 °C at rated power
85 °C, 85 % humidity
10 % bias, 1000 h
5 x rated power for 5 s
1000 h, 170 °C
MIL-PRF-49465
MIL-STD-202, method 106, 0 % power,
7a and 7b not required
100 g, 6 ms
(10 Hz to 2000 Hz) 20 g
10 s to 12 s at + 260 °C
MIL-STD-202
For any questions, contact
foil@vpgsensors.com
MIL-PRF-49465B
R
LIMITS
± (0.5 % + 0.0005R)
± (1.0 % + 0.0005R)
± (0.5 % + 0.0005R)
± (0.5 % + 0.0005R)
± (1.0 % + 0.0005R)
± (0.5 % + 0.0005R)
± (0.5 % + 0.0005R)
± (0.1 % + 0.0005R)
± (0.1 % + 0.0005R)
± (0.25 % + 0.0005R)
95 % coverage
TYPICAL
R
LIMITS
0.1 %
0.05 %
0.05 %
0.1 %
0.2 %
0.05 %
0.02 %
0.02 %
0.02 %
0.05 %
-
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3
MAXIMUM
R
LIMITS
0.2 %
0.2 %
0.2 %
0.2 %
0.3 %
0.1 %
0.05 %
0.05 %
0.05 %
0.1 %
CSM2512S
FIGURE 3 - LOAD LIFE RESULTS OF CSM2512S VS. CSM2512
CSM2512S 0R05
Load Life 2000 HRS @ 1 W @ +70°C (15 units)
1500
1000
500
3000
2500
2000
1500
1000
CSM2512 0R05
Load Life 2000 HRS @ 1 W @ +70°C (15 units)
R/R (ppm)
R/R (ppm)
500
0
500
1000
1500
2000
-1000
-1500
-2000
-2500
-3000
0
0
-500
-1000
-1500
500
1000
1500
2000
2500 -500 0
Time (Hours)
Time (Hours)
TABLE 3 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y44870R10000B0R (preferred part number format)
DENOTES PRECISION
Y
VALUE
R
=
CHARACTERISTICS
(1)
0
= standard part, tin/lead termination
9
= standard part, lead (Pb)-free termination
1 - 999
= custom
Y
4
4
8
7
0
R
1
0
0
0
0
B
0
R
PRODUCT CODE
4487
= CSM2512S
RESISTANCE TOLERANCE
B
C
D
F
= ± 0.1 %
= ± 0.25 %
= ± 0.5 %
= ± 1.0 %
PACKAGING
W
= waffle pack
R
= tape and reel
FOR EXAMPLE: ABOVE GLOBAL ORDER Y4487 0R10000 B 0 R:
TYPE: CSM2512S
VALUE: 100.0 m
ABSOLUTE TOLERANCE: ± 0.1 %
TERMINATION: standard tin/lead
PACKAGING: tape and reel
HISTORICAL PART NUMBER: CSM2512S 0R1000 B B T (will continue to be used)
CSM2512S
MODEL
0R1000
OHMIC VALUE
0R1000
= 0.100
B
C
D
F
B
ABS. TOLERANCE
= ± 0.1 %
= ± 0.25 %
= ± 0.5 %
= ± 1.0 %
B
TERMINATION
S
= lead (Pb)-free
B
= tin/lead
T
PACKAGING
T
= tape and reel
W
= waffle pack
Note
(1)
For non-standard requests, please contact application engineering.
www.vishayfoilresistors.com
4
For any questions, contact
foil@vpgsensors.com
Document Number: 63145
Revision: 4-Mar-15
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Vishay Precision Group, Inc.
Disclaimer
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(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.
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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
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responsibility to validate that a particular product with the properties described in the product specification is suitable for
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Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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