CSM3637P
Vishay Foil Resistors
Ultra High Precision, Surface Mount Metal Strip Resistor with
Increased Power to 5W (40A max), Resistance Values from 3 m,
and TCR to ± 15 ppm/°C
FEATURES
Resistance range: 3 m to 100 m
NEW
Temperature coefficient of resistance (TCR):
15 ppm/°C maximum
(- 55 °C to + 125 °C, + 25 °C ref.)
INTRODUCTION
Load life stability: ± 0.2 % (70 °C, 2000 h at rated
power)
The CSM3637P 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.
Power rating: to 5 W (see Table 1)
Resistance tolerance: to ± 0.1 %
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)
There are many current sense resistors on the market. Until
now the combination of very stable and precise resistors
with low TCR of ± 15 ppm/°C maximum, tight tolerance of
± 0.1 % and load life stability of ± 0.2 % (2000 h, + 70 °C at
rated power) was not easily available.
Short time overload: ± 0.1 % typical
Proprietary processing technique produces extremely low
resistance values with improved stability
The key performance of the new CSM3637P is its high rated
power up to 5W. This option became available due to a
special design which consists of a heat sink on the top of the
resistive element, thus allowing a better heat dissipation.
All welded construction
Solderable terminations
Very low inductance 0.5 nH
Excellent frequency response to 50 MHz
These specifications are based on tests performed in
accordance with methods prescribed by appropriate
MIL-PRF standards (MIL-PRF-55342 and MIL-PRF-49465).
Low thermal EMF < 3 µV/°C (DC offset error, significant for
low values)
The four terminal device separates the current leads from
the voltage sensing leads. This configuration eliminates the
effect of the lead wire resistance from points A to B and
C to D.
Maximum current: up to 40 A
Four terminal (Kelvin) design: allows for precise and
accurate measurements
Terminal finishes available: lead (Pb)-free, tin/lead alloy
In addition, a key feature of the CSM3637P is its low thermal
EMF design (very important for low ohmic value DC
applications). The welded terminals make intimate contact
with the chip thereby minimizing temperature differentials.
Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vishaypg.com
Our application engineering department is available to
advise and make recommendations.
For better performances, please contact us
For non-standard technical requirements and special
applications, please contact: foil@vishaypg.com
FIGURE 1 - POWER DERATING CURVE
+ 70 °C
100
B
C
80
60
40
20
0
R
I
I
A
D
- 65 - 50
- 25
0
25
50
75
100
125
150 170
Ambient Temperature (°C)
V
~
=
Zin
∞
* Pb containing terminationOPDs are RoHS compliant, exemptions may apply
Document Number: 63210
Revision: 31-Oct-11
For any questions, contact: foil@vishaypg.com
www.vishayfoilresistors.com
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