CSM Series
Bulk Bulk Metal
®
High
Metal® echnology Technology High Precision, Current Sensing,
T
Precision,
Current
Sensing,
Power
Surface
Mount,
Metal Resistor
Strip
Power Surface Mount, Metal Strip Resistor
with Resistance Value from 1 mΩ, Rated Power up to 3 W
and TCR to 0±15 ppm/°C Maximum
FEATURES
• Temperature coefficient of resistance:
±15 ppm/°C max. (–55°C to +125°C, +25°C ref.);
±10 ppm/°C max. (–55°C to +125°C, +25°C ref.)
is available on request (see table 1)
• Power rating: 1 W to 3 W
• Resistance tolerance: ±0.1%
• Resistance range: 1 mΩ to 200 mΩ
• Bulk Metal
®
Foil resistors are not restricted to standard
values, specific “as required” values can be supplied at
no extra cost or delivery (e.g., 2.3456 mΩ vs. 2 mΩ)
• Load life stability to ±0.2% (70°C, 2000 h
at rated power)
• Short time overload: ±0.1% typical
• Thermal EMF: 3 µV/°C (DC offset error, significant
for low values)
• Maximum current: up to 54 A
• Proprietary processing techniques produce low TCR,
tight tolerance and improve stability
• Low inductance <5 nH
• Solderable terminations
• Excellent frequency response to 50 MHz
•
Screening in accordance with EEE-INST002
available (per MIL-PRF-55342 and MIL-PRF-49465;
see 303144 and 303145 datasheets)
• Terminal finishes available: lead (Pb)-free, tin/lead alloy
• Quick prototype quantities available,
please contact:
foil@vpgsensors.com
• For better performance please contact:
application engineering
INTRODUCTION
No minimum order quantity and any value at any
tolerance available within resistance range.
The Vishay Foil Resistors (VFR) 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
R
C
I
D
Zin
~
∞
=
V
Four terminal (Kelvin) design: allows for precise and
accurate measurements.
Figure 1 – Power Derating Curve
Rated Power (%)
100
80
60
40
20
0
–65 –50
–25
0
25
50
75
100
125
150
170
+70°C
Ambient Temperature (°C)
Notes
* This datasheet provides information about parts that are RoHS-compliant and/or parts that are non-RoHS-compliant. For example,
parts with lead (Pb) terminations are not RoHS compliant. Please see the information/tables in this datasheet for details.
4138-EN
Rev 11-Jan-2021
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
1
CSM Series
Table 1 – Specifications
PARAMETER
Resistance Range
Power Rating at 70°C
Maximum Current
(2)
Tolerance
Temperature Coefficient Max.
(–55°C to +125°C, +25°C Ref.)
CSM2512
1 mΩ to 200 mΩ
1 W
(1)
31 A
±0.5% (1 mΩ to <3 mΩ)
±0.1% (3 mΩ to 200 mΩ)
±50 ppm/°C (1 mΩ to <3 mΩ)
±15 ppm/°C (3 mΩ to 200 mΩ)
(3)
±10 ppm/°C (3 mΩ to 10 mΩ)
is available on request
(4)
–65°C to +170°C
(P × R)
1/2
0.09 g
CSM3637
3 W (1 mΩ to 10 mΩ)
2 W (>10 mΩ to 200 mΩ)
54 A
±0.5% (1 mΩ to <2 mΩ)
±0.1% (2 mΩ to 200 mΩ)
±25 ppm/°C (1 mΩ to <3 mΩ)
±15 ppm/°C (3 mΩ to 200 mΩ)
(3)
±10 ppm/°C (1 mΩ to 10 mΩ)
is available on request
(4)
Operating Temperature Range
Maximum Working Voltage
Weight (Maximum)
0.29 g
Notes
(1)
For values above 0.1 Ω derate linearly to 80% rated power at 0.5 Ω
(2)
Maximum current for a given resistance value is calculated using I = P/R
(3)
Loose TCR is available on request: 35ppm/C (3mΩ to 200mΩ)
(4)
Please contact application engineering:
foil@vpgsensors.com
ABOUT CSM
(Low Ohm Value 1 mΩ to 200 mΩ)
New high-precision Bulk Metal
®
surface-mount Power
Metal Strip
®
resistor of 1 mΩ to 200 mΩ that features
an improved load-life stability of ±0.2% at +70°C for
2000 h at rated power, an absolute TCR of ±15 ppm/°C
maximum from –55°C to +125°C, +25°C ref., and a
tolerance of ±0.1%.
Typical current sensing resistors offer a load-life stability
of ≥ 1% through a 2000 h workload. The improved
resistance stability of the CSM Series makes it ideal for
tightened-stability voltage division and precision current
sensing applications in switching linear power supplies,
power amplifiers, measurement instrumentation, bridge
networks, and medical and test equipment. In addition,
the CSM Series complies with EEE-INST-002
(MIL-PRF 55342 and MIL-PRF 49465) for military and
space applications.
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.
The CSM’s all-welded construction is composed of a Bulk
Metal
®
resistive element with welded copper terminations,
plated for soldering. The terminations make true ohmic
contact with the resistive layer along the entire side of
the resistive 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.
Notes
* This datasheet provides information about parts that are ROHS-compliant and/or parts that are non-ROHS-compliant. For example ,
parts with lead (Pb) terminations. Please see the information /tables in this datasheet for details.
www.vishayfoilresistors.com
2
For any questions, contact
foil@vpgsensors.com
4138-EN
Rev 11-Jan-2021
CSM Series
Additionally, the overall system cost is often reduced
when a knowledgeable designer concentrates costs in
a few exceptionally stable components whose proven
minimal-deviation 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
be necessary with current-sensing resistors based on
other technologies.
The Key Applications
Applications requiring accuracy and repeatability under
stress conditions such as the following:
•
•
•
•
•
•
•
•
•
•
•
•
Switching and linear power supplies
Precision current-sensing
Power management systems
Feedback circuits
Power amplifiers
Measurement instrumentation
Precision instrumentation amplifiers
Medical and automatic test equipment
Satellites and aerospace systems
Commercial and Military avionics
Test and measurement equipment
Electronic scales
Figure 2 – Dimensions and Imprinting
in inches (millimeters)
CSM2512 DIMENSIONS
(1)
CSM3637 DIMENSIONS
(1)
H
H
A
B
L
T
W
A
L
T
W
B
CSM2512 LAND PATTERN
I
1
e
E
1
E
2
I
2
I
Kelvin Connection
I
1
, I
2
- Current
E
1
, E
2
- Sense
a
b
d
c
CSM3637 LAND PATTERN
E
1
I
1
E
2
c
I
2
I
a
d
b
Dimensions – Tolerances ±0.010 (±0.254),* ±0.015 (±0.381)
MODEL
RESISTANCE RANGE (mΩ)
1 to < 5
CSM2512
5 to < 7
7 to 200
CSM3637
1 to < 2
2 to 200
0.360 (9.144)
0.360 (9.144)
0.370 (9.398)
0.370 (9.398)
0.025 (0.635)
0.025 (0.635)
0.250 (6.350)
0.125 (3.175)
0.025 (0.635)
L
W
H
T
0.087 (2.210)
0.047 (1.194)
0.030 (0.762)
0.138 (3.505)
0.086 (2.184)
0.061 (1.55)
0.061 (1.549)
0.032 (0.813)
0.032 (0.813)
0.030 (0.762)* 0.032 (0.813)*
A
B
Land Pattern Dimensions – Tolerances ±0.003 (±0.076)
MODEL
RANGE
0R001 to 0R0049
CSM2512
0R005 to 0R0069
0R007 to 0R2
CSM3637
0R001 to 0R0019
0R002 to 0R2
a
0.120 (3.05)
0.083 (2.10)
0.065 (1.65)
0.168 (4.27)
0.116 (2.95)
b
0.145 (3.68)
0.145 (3.68)
0.145 (3.68)
0.390 (9.91)
0.390 (9.91)
c
0.045 (1.14)
0.045 (1.14)
0.045 (1.14)
0.066 (1.68)
0.066 (1.68)
d
0.021 (0.53)
0.021 (0.53)
0.021 (0.53)
0.024 (0.610)
0.024 (0.610)
e
0.055 (1.39)
0.055 (1.39)
0.055 (1.39)
–
–
I
0.050 (1.27)
0.125 (3.17)
0.160 (4.06)
0.074 (1.88)
0.178 (4.52)
Note
(1)
White dot indicates top side of part for mounting purposes
4138-EN
Rev 11-Jan-2021
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
3
CSM Series
Table 2 – CSM Series 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
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
MIL-PRF-49465B
∆R LIMITS
±(0.5%+0.0005R)
±(1.0%+0.0005R)
CSM2512/CSM3637
TYPICAL ∆R LIMITS
(1)
MAXIMUM ∆R LIMITS
(1)
0.1%
0.2%
0.05%
0.1%
0.2%
0.05%
0.02%
0.02%
0.02%
0.05%
–
0.3%
1.0%
0.2%
0.3%
0.3%
0.1%
0.05%
0.05%
0.05%
0.1%
–
Figure 4 - Bais Humidity Test of CSM2512 and CSM3637
5 x rated power for 5 s
(See note (3) from table 1)
1000 h, 170°C
–55°C for 24 h
MIL-STD-202, method 106,
0 power, 7a and 7b not required
100 g, 6 ms, 5 pulses
(10 Hz to 2000 Hz) 20 g
10 s to 12 s at +260°C
MIL-STD-202
±(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
Note
(1)
Measurement error allowed for ΔR limits: 0.0005 Ω.
FIGURE 6 – LOAD LIFE RESULTS OF CSM2512
Figure 3 – Load Life Results of CSM2512
CSM2512 0R05
Load Life 2000HRS @ 1W @ +70C (15 units)
3000
2500
2000
1500
1000
∆R/R (ppm)
500
0
-500 0
-1000
-1500
-2000
-2500
-3000
Time (Hours)
500
1000
1500
2000
2500
2500
FIGURE 8 – Pulse Test II
CSM3637 0R005 Pulse Test - 10 units
35 Pules of 0.2msec @ 20A, 0.5 msec @ 3A)
www.vishayfoilresistors.com
4
25
Average Resistance deviation: 13.3ppm
foil@vpgsensors.com
STD=27.3 ppm, Mesurment Error=0.0005R
For any questions, contact
4138-EN
Rev 11-Jan-2021
CSM Series
Figure 4 – Thermal Shock Results of CSM3637 and CSM2512
Thermal Shock (– 55°C to +150°C) x 1000 Cycles
20 Units Each Type and Value
2000
1500
1000
R/R (ppm)
500
0
–500
–1000
–1500
–2000
CSM3637 0R1
CSM3637 0R2
CSM2512 0R1
CSM2512 0R2
Type and Value
Figure 5 – Bias Humidity Results of CSM3637 and CSM2512
Bias Humidity 1000 Hrs @ +85°C @ 85% RH
10 Units Each Type and Value
1000
800
600
400
R/R (ppm)
200
0
–200
–400
–600
–800
–1000
CSM3637 0R2
CSM3637 0R1
CSM2512 0R1
CSM2512 0R2
Type and Value
4138-EN
Rev 11-Jan-2021
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
5
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