PRELIMINARY
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CSM3637F
For any questions, contact
foil@vpgsensors.com
Document No.: 63265
Revision: 12-Feb-2018
Bulk Metal® Foil Technology High Precision, Current Sensing, Power Surface Mount Resistor
Bulk Metal® Foil Technology High Precision, Current Sensing,
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
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.
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.
Document No.: 63265
Revision: 12-Feb-2018
Top View Bottom View
Figure 1—Power Derating Curve
–65 –50 –25 0255075 100 125 150 170
Ambient Temperature (°C)
100
80
60
40
20
0
Rated Power (%)
+ 70 °C
CSM3637F
I
A
R
Zin
I
D
V
=
~
∞
BC
Table 1—Specifications
Parameter Value
Resistance range 20 mΩ to 200 mΩ(1)
Power rating at 70°C 2 W: 20 mΩ to <50 mΩ; 3 W: 50 mΩ to 200 mΩ
Maximum current(2) 10 A
Tolerance ±0.1
Temperature coefficient maximum (–55°C to +125°C, +25°C Ref.) ±15 ppm/°C, R <100 mΩ; ±10 ppm/°C(3) R ≥100 mΩ
Operating temperature range –65°C to +170°C
Maximum working voltage (P x R)1/2
Weight (maximum) 0.29 g
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.
Four terminal (Kelvin) design:
allows for precise and accurate measurements.
PRELIMINARY
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CSM3637F
For any questions, contact
foil@vpgsensors.com
Document No.: 63265
Revision: 12-Feb-2018
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)
Kelvin Connection
I1, I2 — Current
E
1
, E
2
— Sense
CSM3637F LAND PATTERN
e
a
d
c
b
E1
E2
I1
I2
CSM3637F DIMENSIONS
BOTTOM VIEW
TOP VIEW
W
B
A
L
T
H
Terminals
Lead frame
Resistive element
Ceramic substrate
Dimensions—Tolerances ±0.010 (±0.254)
L W H T A B
0.365 (9.271) 0.375 (9.525) 0.040 (1.016) 0.091 (2.311) 0.058 (1.473) 0.040 (1.016)
Land Pattern Dimensions—Tolerances ±0.003 (±0.076)
a b c d e
0.116 (2.95) 0.390 (9.91) 0.066 (1.68) 0.024 (0.610) 0.178 (4.52)
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CSM3637F
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Document No.: 63265
Revision: 12-Feb-2018
Table 3—Performance Specifications
Test/Condition MIL-PRF-49465B
ΔR LIMITS
Resistance
Value
Typical
ΔR Limits(1)
Max
ΔR Limits(1)
Thermalshock
–65°C to +150°C, 5 cycles, 15 min at each extreme ±(0.5% +0.0005R) 50 mΩ to 200 mΩ 0.03% 0.05%
20 mΩ to <50 mΩ 0.05% 0.1%
Load-life stability
2000 h, +70°C at rated power ±(1.0% +0.0005R)
≥100 mΩ 0.05% 0.1%
50 mΩ to <100 mΩ 0.2% 0.5%
20 mΩ to <50 mΩ 0.5% 1%
Short-time overload
5 x rated power, 5 s ±(0.5% +0.0005R) 20 mΩ to 200 mΩ 0.02% 0.03%
High temperature exposure
1000 h, 170°C ±(1.0% +0.0005R) 20 mΩ to 200 mΩ 0.2% 0.3%
Moisture resistance
MIL-STD-202, method 106, 0 power, 7a and 7b not
required
±(0.5% +0.0005R) 20 mΩ to 200 mΩ 0.005% 0.01%
Shock
100 g, 6 ms, 5 pulses ±(0.1% +0.0005R) 20 mΩ to 200 mΩ 0.02% 0.05%
Resistance to soldering heat
10 s to 12 s at +260°C ±(0.25% +0.0005R) 20 mΩ to 200 mΩ 0.03% 0.05%
Note
(1) Measurement error allowed for ∆R limits: 0.0005 Ω.
Figures 3—Global Part Number Information(1)
NEW GLOBAL PART NUMBER:
Y14750R20000B0R (preferred part number format)
DENOTES PRECISION VALUE CHARACTERISTICS
YR = Ω0 = standard
9 = lead (Pb)-free
1 to 999 = custom
PRODUCT CODE RESISTANCE TOLERANC
EP
ACKAGING
1475 = CSM3637F B = ± 0.1%
C = ± 0.25%
D = ± 0.5%
F = ± 1.0%
W = waffle
R = tape and reel
FOR EXAMPLE: ABOVE GLOBAL ORDER Y1487 0R20000 B 0 R:
TYPE: CSM3637F
VALUE: 200.0 mΩ
ABSOLUTE TOLERANCE: ± 0.1%
TERMINATION: standard tin/lead
PACKAGING: tape and reel
HISTORICAL PART NUMBER STYLE: CSM3637F 0R2000 B B T (will continue to be used)
CSM3637F 0R2000 BBT
MODEL OHMIC VALUE ABS. TOLERANCETERMINATION PACKAGING
0.200 B = ± 0.1%
C = ± 0.25%
D = ± 0.5%
F = ± 1.0%
S = lead (Pb)-free
B = tin/lead
T = tape and reel
W = waffle pack
Note
(1
)
For non-standard requests, please contact application engineering
4750 200RY1 B00 R0
Vishay Precision Group, Inc.
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Document No.: 63999
Revision: 15-Jul-2014
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