CSM3637F
Bulk Metal
BulkMetal®FoilT
®
Foil Technology High Precision, Current Sensing,
echnologyHighPrecision,CurrentSensing,
PowerSurfaceMountResistor
Power Surface Mount Resistor
with Rated Power up to 3 W and TCR ±10 ppm/°C
FEATURES
• Temperature coefficient of resistance (TCR):
10 ppm/°C max. (–55°C to +125°C, +25°C ref.)
For tighter TCR please contact us.
• Power rating: 3 W
• Resistance tolerance: to ±0.1%
• Resistance range: 20 mΩ to 200 mΩ
• Load-life stability: to ±0.05% typical
(70°C, 2000 h at rated power)
• Short-time overload: 0.02% typical
• Power coefficient of resistance (PCR), “∆R due to self
heating”: 5 ppm/W at rated power
• Electrostatic discharge (ESD): at least to 25 kV
• Solderable terminations
• Terminal finish available: lead (Pb)-free, tin/lead alloy
• Quick prototype quantities available; please contact
foil@vpgsensors.com
Top View
Bottom View
B
I
A
R
C
I
D
Zin
~
∞
=
V
Four terminal (Kelvin) design:
allows for precise and accurate measurements.
INTRODUCTION
Model CSM3637F is a surface mount chip resistor
designed with 4 pads for Kelvin connection. Utilizing
Bulk Metal
®
Foil as the resistance element, it provides
enhanced characteristic capabilities resulting in
superior performance when compared with other
resistor technologies. The unique combination of Z Foil
technology along with the designed 4 pads lead frame
configuration results in significant reduction of the
component’s sensitivity to applied power changes such
as power coefficient of resistance (PCR) and thermal
resistance.
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)
Table 1—Specifications
Parameter
Resistance range
Power rating at 70°C
Maximum current
(2)
Tolerance
Temperature coefficient maximum
(–55°C to +125°C, +25°C Ref.)
Operating temperature range
Maximum working voltage
Weight (maximum)
Notes
(1)
Contact application engineering for values outside this range.
(2)
Maximum current for a given resistance value is calculated using I = √P/R .
(3)
For tighter TCR, please contact application engineering: foil@vpgsensors.com.
Note
* 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.
9670-EN
Rev 01-Jul-2020
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
1
Value
20 mΩ to 200 mΩ
(1)
2 W: 20 mΩ to <50 mΩ; 3 W: 50 mΩ to 200 mΩ
10 A
±0.1
±15 ppm/°C, R <100 mΩ; ±10 ppm/°C
(3)
R ≥100 mΩ
–65°C to +170°C
(P x R)
1/2
0.29 g
CSM3637F
ABOUT CSM3637F
The CSM3637F is a current sensing solution that was
developed with a low TCR to meet demands for stable
resistive product solutions in the industry. As it is critical
for this resistor to reach thermal equilibrium quickly in
circuits that require fast response or where the current
changes swiftly, the CSM3637F is used where the
emphasis is on accuracy and repeatability under stress
conditions in applications requiring precision resistor
performance up to 3 W. 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 4-pad CSM3637F Bulk Metal
®
Foil surface mount
resistor features an improved load-life stability of max
±0.05% at + 70°C for 2000 h (rated power), a TCR of
±10 ppm/°C maximum from –55°C to +125°C, +25°C ref.,
and a tolerance of ±0.1%.
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 Land Pattern
in Inches (Millimeters)
CSM3637F DIMENSIONS
TOP VIEW
Resistive element
Lead frame
CSM3637F LAND PATTERN
BOTTOM VIEW
Ceramic substrate
E
1
mi
Ter
s
nal
I
1
I
2
e
a
E
2
c
d
b
H
L
T
W
B
A
Note: Recommended stencil thickness 6 mil minimum.
Kelvin Connection
I
1
, I
2
— Current
E
1
, E
2
— Sense
Dimensions—Tolerances ±0.010 (±0.254)
L
0.365 (9.271)
a
0.116 (2.95)
W
0.375 (9.525)
b
0.390 (9.91)
H
0.040 (1.016)
c
0.066 (1.68)
T
0.091 (2.311)
d
0.024 (0.610)
A
0.058 (1.473)
e
0.178 (4.52)
B
0.040 (1.016)
Land Pattern Dimensions—Tolerances ±0.003 (±0.076)
www.vishayfoilresistors.com
2
For any questions, contact
foil@vpgsensors.com
9670-EN
Rev 01-Jul-2020
CSM3637F
Table 3—Performance Specifications
Test/Condition
Thermal shock
–65°C to +150°C, 5 cycles, 15 min at each extreme
Load-life stability
2000 h, +70°C at rated power
Short-time overload
5 x rated power, 5 s
High temperature exposure
1000 h, 170°C
Moisture resistance
MIL-STD-202, method 106, 0 power, 7a and 7b not
required
Shock
100 g, 6 ms, 5 pulses
Resistance to soldering heat
10 s to 12 s at +260°C
Note
(1)
Measurement error allowed for ∆R limits: 0.0005 Ω.
MIL-PRF-49465B
ΔR
LIMITS
±(0.5% +0.0005R)
±(1.0% +0.0005R)
±(0.5% +0.0005R)
±(1.0% +0.0005R)
±(0.5% +0.0005R)
±(0.1% +0.0005R)
±(0.25% +0.0005R)
Resistance
Value
50 mΩ to 200 mΩ
20 mΩ to <50 mΩ
≥100 mΩ
50 mΩ to <100 mΩ
20 mΩ to <50 mΩ
20 mΩ to 200 mΩ
20 mΩ to 200 mΩ
20 mΩ to 200 mΩ
20 mΩ to 200 mΩ
20 mΩ to 200 mΩ
Typical
ΔR
Limits
(1)
0.03%
0.05%
0.05%
0.2%
0.5%
0.02%
0.2%
0.005%
0.02%
0.03%
Max
ΔR
Limits
(1)
0.05%
0.1%
0.1%
0.5%
1%
0.03%
0.3%
0.01%
0.05%
0.05%
Figures 3—Global Part Number Information
(1)
NEW GLOBAL PART NUMBER: Y14750R20000B0R (preferred part number format)
DENOTES PRECISION
Y
VALUE
R
=Ω
CHARACTERISTICS
0
= standard
9
= lead (Pb)-free
1 to 999
= custom
Y
1
4
7
5
0
R
2
0
0
0
0
B
0
R
1475
= CSM3637F
PRODUCT CODE
RESISTANCE TOLERANCE
B
= ± 0.1%
C
= ± 0.25%
D
= ± 0.5%
F
= ± 1.0%
W
= waffle
R
= tape and reel
PACKAGING
TYPE: CSM3637F
VALUE: 200.0 mΩ
ABSOLUTE TOLERANCE: ± 0.1%
TERMINATION: standard tin/lead
PACKAGING: tape and reel
CSM3637F
MODEL
FOR EXAMPLE: ABOVE GLOBAL ORDER Y1487 0R20000 B 0 R:
HISTORICAL PART NUMBER STYLE: CSM3637F 0R2000 B B T (will continue to be used)
0R2000
OHMIC VALUE
0.200
B
ABS. TOLERANCE
B
= ± 0.1%
C
= ± 0.25%
D
= ± 0.5%
F
= ± 1.0%
B
S
= lead (Pb)-free
B
= tin/lead
TERMINATION
T
T
= tape and reel
W
= waffle pack
PACKAGING
Note
(1)
For non-standard requests, please contact application engineering
9670-EN
Rev 01-Jul-2020
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
3
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Vishay Precision Group, Inc.
Disclaimer
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Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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