CSM3637S
Bulk Metal
®
Foil Technology High Precision, Current Sensing, Power
Surface Mount, Metal Strip Resistor with Improved Stability 0.05 %,
Resistance Value from 10 m, Rated Power to 2 W and TCR to 0 ± 20 ppm/°C
FEATURES
Temperature coefficient of resistance (TCR):
(- 55 °C to + 125 °C, + 25 °C ref.)
± 20 ppm/°C maximum
Load life stability to ± 0.05 % (70 °C, 2000 h
at rated power)
Power rating: 2 W
Resistance tolerance: ± 0.2 %
INTRODUCTION
The CSM3637S is a low value current sense resistor,
providing 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.
There are many current sense resistors on the market, until
now the combination of very stable and precise resistors
with low TCR as much as 0 ppm/°C ± 20 ppm/°C, tight
tolerance of ± 0.2 % and excellent load life stability of
± 0.05 % (2000 h, + 70 °C at rated power) were not easily
available.
The key performance of the new CSM3637S is stability,
which is the ability of this resistor to maintain its value with
time under nominal load at various environmental
conditions.
These specifications are based on tests performed in
accordance with methods prescribed by appropriate
MIL-PRF standards.
The four terminal device separates the current leads from
the voltage drop sensing leads. This configuration
eliminates the effect of the lead wire resistance from points
A to B and C to D.
A key feature of the CSM3637S is its low thermal EMF
design. The welded terminals make intimate contact with
the chip thereby minimizing temperature variations.
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
Resistance range: 10 m to 100 m
Vishay Foil resistors are not restricted to standard values;
specific “as required” values can be supplied at no extra
cost or delivery (e.g. 10.2345 m vs. 10 m)
Short time overload: 0.1 %
Proprietary processing technique produces extremely low
resistance values with improved stability
All welded construction
Solderable terminations
Very low inductance 0.5 nH to 5 nH
Excellent frequency response to 50 MHz
Low thermal EMF (< 3 µV/°C)
Maximum current: up to 14 A
Four terminal (Kelvin) design: allows for precise and
accurate measurements
Terminal finishes available: lead (Pb)-free or tin/lead alloy
Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vpgsensors.com
Screening in accordance with EEE-INST002 available
(per MIL-PRF-55342 and MIL-PRF-49465; see 303144
and 303145 datasheets)
For better performances please contact Application
Engineering
FIGURE 1 - POWER DERATING CURVE
+ 70 °C
100
Rated Power (%)
80
60
40
20
0
- 65 - 50
- 25
0
25
50
75
100
125
150
170
~
∞
=
V
Ambient Temperature (°C)
* Pb containing terminations are RoHS compliant, exemptions may apply
Document Number: 63168
Revision: 5-Mar-15
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
1
CSM3637S
TABLE 1 - PERFORMANCE SPECIFICATIONS
PARAMETER
Resistance Range
Power Rating at 70 °C
Maximum Current
Tightest Tolerance
Temperature Coefficient Maximum (- 55 °C to + 125 °C, + 25 °C ref.)
Operating Temperature Range
Weight (maximum)
CSM3637S
10 m to 100 m
2W
14 A
± 0.2 %
± 20 ppm/°C
- 65 °C to + 170 °C
0.29 g
FIGURE 2 - DIMENSIONS AND IMPRINTING
in inches (millimeters)
CSM3637S DIMENSIONS
(1)
CSM3637S LAND PATTERN
E
1
I
1
E
2
c
A
B
I
W
I
2
d
b
H
L
T
a
DIMENSIONS - TOLERANCES ± 0.010 (± 0.254)
RESISTANCE RANGE (m)
10 to 100
RESISTANCE RANGE (m)
10 to 100
L
0.360 (9.144)
i
0.178 (4.52)
W
0.370 (9.398)
b
0.390 (9.91)
H
0.025 (0.635)
-
-
T
0.086 (2.184)
a
0.116 (2.95)
A
0.061 (1.549)
c
0.066 (1.68)
B
0.032 (0.813)
d
0.024 (0.610)
LAND PATTERN DIMENSIONS - TOLERANCES ± 0.003 (± 0.076)
Note
(1)
White dots indicate top side of part for mounting purposes
TABLE 2 - CSM3637S 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
Note
• Measurement error 0.0005R per MIL-PRF-49465
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
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 %
-
MAXIMUM
R
LIMITS
0.2 %
0.2 %
0.2 %
0.2 %
0.3 %
0.1 %
0.05 %
0.05 %
0.05 %
0.1 %
www.vishayfoilresistors.com
2
For any questions, contact
foil@vpgsensors.com
Document Number: 63168
Revision: 5-Mar-15
CSM3637S
CSM3637S CONSTRUCTION
1. Resistive element
2. Copper terminal with solderable finish
3. Terminal-to-element weld
4. High temperature encapsulation
TABLE 3 - GLOBAL PART NUMBER INFORMATION
(1)
NEW GLOBAL PART NUMBER: Y14720R10000E0R (preferred part number format)
DENOTES PRECISION
Y
VALUE
R
=
CHARACTERISTICS
0
= standard part, tin/lead termination
9
= standard part, lead (Pb)-free termination
1 to 999
= custom
Y
1
4
7
2
0
R
1
0
0
0
0
E
0
R
PRODUCT CODE
1472
= CSM3637S
RESISTANCE TOLERANCE
E
C
D
F
= ± 0.2 %
= ± 0.25 %
= ± 0.5 %
= ± 1.0 %
PACKAGING
W
= waffle pack
R
= tape and reel
FOR EXAMPLE: ABOVE GLOBAL ORDER Y1472 0R10000 E 0 R:
TYPE: CSM3637S
VALUE: 100.0 m
ABSOLUTE TOLERANCE: ± 0.2 %
TERMINATION: standard tin/lead
PACKAGING: tape and reel
HISTORICAL PART NUMBER: CSM3637S 0R1000 E B T (will continue to be used)
CSM3637S
MODEL
0R1000
OHMIC VALUE
0R1000
= 0.100
E
C
D
F
E
ABS. TOLERANCE
= ± 0.2 %
= ± 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.
Document Number: 63168
Revision: 5-Mar-15
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
3
Legal Disclaimer Notice
Vishay Precision Group, Inc.
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(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.
VPG makes no warranty, representation or guarantee other than as set forth in the terms and conditions of purchase.
To the maximum extent permitted by applicable law, VPG disclaims (i) any and all liability arising out of the
application or use of any product, (ii) any and all liability, including without limitation special, consequential or
incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular purpose,
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
are based on VPG’s knowledge of typical requirements that are often placed on VPG products. It is the customer’s
responsibility to validate that a particular product with the properties described in the product specification is suitable for
use in a particular application. You should ensure you have the current version of the relevant information by contacting
VPG prior to performing installation or use of the product, such as on our website at vpgsensors.com.
No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or by any
conduct of VPG.
The products shown herein are not designed for use in life-saving or life-sustaining applications unless otherwise
expressly indicated. Customers using or selling VPG products not expressly indicated for use in such applications do
so entirely at their own risk and agree to fully indemnify VPG for any damages arising or resulting from such use or sale.
Please contact authorized VPG personnel to obtain written terms and conditions regarding products designed for such
applications.
Product names and markings noted herein may be trademarks of their respective owners.
Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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