303144, 303145
Models # 303144 and 303145 - Fixed Resistors CSM2512 and CSM3637
with Screen/Test Flow in Compliance with EEE-INST-002 (Tables 2A and
3A, Film/Foil, Level 1) MIL-PRF-55342 and MIL-PRF-49465
FEATURES
Temperature coefficient: ± 20 ppm/°C max.
(- 55 °C to + 125 °C, + 25 °C ref.) (see Table 1)
Surface mount configuration
Four terminal (Kelvin) design: allows for precision accurate
measurements
Power rating: 1 W to 3 W
Resistance tolerance: ± 0.5 %
Resistance range: 2 m to 200 m
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. 2.345 m vs. 2 m)
Short time overload: 0.2 % typical
Thermal EMF: 3 µV/°C
Maximum current: up to 38 A
Terminal finish: tin/lead alloy
For prototype units, append a “U” to the model number
(example: 303144U). These units have all of the table 2A
(page 3) 100 % tests performed, with no destructive
qualification testing required (table 3A, page 3). For more
information, please contact
foil@vpgsensors.com
For oriented performances please contact Application
Engineering
303144 and 303145 are low value current sense resistors,
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.
The four terminal devices separate 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.
Vishay Foil Resistors' application engineering department is
available to advise and make recommendations.
B
I
A
Zin
~
∞
=
V
R
C
I
D
FIGURE 1 - POWER DERATING CURVE
Percent of 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
Tightest Tolerance
Temperature Coefficient Max.
(- 55 °C to + 125 °C, + 25 °C ref.)
Operating Temperature Range
Weight (maximum)
Document Number: 63166
Revision: 21-Dec-15
0.09 g
For any questions, contact
foil@vpgsensors.com
± 20 ppm/°C (3 m to < 100 m)
± 25 ppm/°C (100 m to 200 m)
303144
3 m to 200 m
1W
18 A
± 0.5 %
± 25 ppm/°C (2 m to
3 m)
± 25 ppm/°C (100 m to 200 m)
± 20 ppm/°C (> 3 m to < 100 m)
0.29 g
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303145
2 m to 200 m
3 W ( 2 m to 10 m)
2 W (> 10 m to 200 m)
38 A
- 55 °C to + 125 °C, ref. + 25 °C
303144, 303145
FIGURE 2 - DIMENSIONS AND IMPRINTING
in inches (millimeters)
303144 DIMENSIONS
(1)
303145 DIMENSIONS
(1)
H
H
A
B
L
T
W
B
A
L
T
W
303144 LAND PATTERN
I
1
E
1
e
I
2
I
Kelvin Connection
I
1
, I
2
- Current
E
1
, E
2
- Sense
a
b
E
2
d
c
303145 LAND PATTERN
E
1
I
1
E
2
c
I
2
I
a
d
b
DIMENSIONS - TOLERANCES ± 0.010 (± 0.254)
MODEL
RESISTANCE RANGE (m)
3 to < 5
303144
5 to < 7
7 to 200
303145
2 to 200
0.360 (9.144)
0.370 (9.398)
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)
0.086 (2.184)
0.061 (1.549)
0.032 (0.813)
0.030 (0.762)
0.032 (0.813)
A
B
LAND PATTERN DIMENSIONS - TOLERANCES ± 0.003 (± 0.076)
MODEL
RANGE
0R003 to 0R0049
303144
0R005 to 0R0069
0R007 to 0R2
303145
Note
(1)
a
0.120 (3.05)
0.083 (2.10)
0.065 (1.65)
0.116 (2.95)
b
0.145 (3.68)
0.145 (3.68)
0.145 (3.68)
0.390 (9.91)
c
0.045 (1.14)
0.045 (1.14)
0.045 (1.14)
0.066 (1.68)
d
0.021 (0.53)
0.021 (0.53)
0.021 (0.53)
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)
0.178 (4.52)
0R002 to 0R2
White dot indicates top side of part for mounting purposes
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For any questions, contact
foil@vpgsensors.com
Document Number: 63166
Revision: 21-Dec-15
303144, 303145
NOTES
Tightest absolute tolerance: 0.5 % for any value within the pertinent ohmic value range.
Measurement error allowed for
R
limits: 0.0005
For prototype units, append a “U” to the model number (example: 303144U). These units have all of the table 2A 100 % tests
performed, with no destructive qualification testing required.
TABLE 2 - EEE-INST-002
(Table 2A Film/Foil, level 1)
100 % TESTS/INSPECTIONS
(1)
RC Record
Thermal Shock
RC Record
High Temperature Exposure
RC Record
Final Inspection
Visual Inspection
Mechanical Inspection
In tolerance
25 x (- 65 °C to + 150 °C)
R
= 0.1 %
+ 170 °C, 100 h, no power
In tolerance
R
= 0.2 %
5 % PDA on
R,
10 % PDA on out of tolerance
Magnification 30 x to 60 x
Dimensions, workmanship, 3 units sample size
Note
(1)
VFR will perform a pre-cap visual inspection 100 % in the production flow prior to overcoating
TABLE 3 - EEE-INST-002
(Table 3A Film/Foil, level 1)
DESTRUCTIVE TESTS - MIL-PRF-49465
(2)
Sample size: 3(0)
Group 2
Solderability
MIL-STD-202, method 208
Sample size: 10(0) - mounted on FR4
TCR measurement per
MIL-STD-202, method 304
- 55 °C/+ 25 °C/+ 125 °C
Low temperature storage
per MIL-PRF-49465
Low temperature operation
per MIL-PRF-55342
Short time overload per
MIL-STD-49465
303144: 3 m to < 100 m: ± 20 ppm/°C
100 m to 200 m: ± 25 ppm/°C
303145: 2 m to
3 m: ± 25 ppm/°C
> 3 m to < 100 m: ± 20 ppm/°C
100 m to 200 m: ± 25 ppm/°C
R
= 0.2 %
- 55 °C ± 2 °C, 24 h ± 4 h
ambient no load dwell for 2 h to 8 h at + 25 °C
R
= 0.2 %
- 65 °C ambient no load dwell for 1 h
rated power for 45 min
no load dwell at + 25 °C for 24 h ± 4 h
R
= 0.5 %
5 x rated power at + 25 °C for 5 s, not to exceed maximum current rating
Group 3
Sample size: 9(0) - mounted on FR4
Resistance to soldering
heat
Moisture resistance per
MIL-STD-202, method 106
(7a and 7b not required)
Sample size: 9(0)
Group 5
Shock per MIL-STD-202,
method 213, condition I
Vibration per MIL-STD-202,
method 204, condition D
Group 6
R
= 0.05 %
100G, 6 ms axes Z and Y, 10 shocks per axis
R
= 0.05 %
10 Hz to 2000 Hz, 20G 2 axes, 6 h per axis
R
= 0.05 %
10 s to 12 s at + 260 °C reflow method
R
= 0.05 %
240 h, no power
Group 4
Sample size: 12(0) - mounted on FR4
Life test per
MIL-PRF-49465
R
= 1 %
2000 h, + 70 °C, rated power
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
3
Document Number: 63166
Revision: 21-Dec-15
303144, 303145
TABLE 3 - EEE-INST-002
(Table 3A Film/Foil, level 1)
DESTRUCTIVE TESTS - MIL-PRF-49465
(2)
Sample Size: 10(0) - mounted on FR4
Group 7B
Solder mounting integrity
per MIL-PRF-55342
303144: 3 kg force, 30 s
303145: 5 kg force, 30 s
Sample size: 5(0) - mounted on FR4
Group 9
High temperature exposure
per MIL-PRF-49465
Sample size:
For 303144: 12
For 303145: 4
Outgassing
Notes
(2)
Units selected randomly from lots which successfully passed the table 2A testing
(3)
Optional, per customer request.
Measurement error allowed for
R
limits: 0.0005
.
R
= 0.3 %
1000 h, + 170 °C ± 7 °C, no power
Group 10
(3)
Per ASTM E595
PART NUMBER IDENTIFICATION
Model #
Base Model
Value Range
303144
CSM2512
3 m to 200 m
303145
CSM3637
2 m to 200 m
Part Number:
{Model} - {Value} - {Tolerance} - {Termination} - {Packaging}
Absolute Tolerance
0.5 %
Code
D
Termination
Tin/lead
Code
B
Packaging
Waffle
Tape and reel
Code
W
T
Example:
303144 - 0R1 - DBW
303144, 100 m, 0.5 %, tin/lead termination, waffle packaging
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For any questions, contact
foil@vpgsensors.com
Document Number: 63166
Revision: 21-Dec-15
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
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No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or by any
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Please contact authorized VPG personnel to obtain written terms and conditions regarding products designed for such
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Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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