303144, 303145
Models 303144 and 303145
Resistors CSM2512 and CSM3637
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 mΩ to 200 mΩ
• 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 mΩ vs. 2 mΩ)
• 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
B
I
A
Zin
~
∞
=
V
R
C
I
D
INTRODUCTION
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.
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.)
Weight (maximum)
±20 ppm/°C (3 mΩ to <100 mΩ)
±25 ppm/°C (100 mΩ to 200 mΩ)
0.09 g
303144
3 mΩ to 200 mΩ
1W
18 A
±0.5%
±25 ppm/°C (2 mΩ to ≤3 mΩ)
±25 ppm/°C (100 mΩ to 200 mΩ)
±20 ppm/°C (>3 mΩ to <100 mΩ)
0.29 g
303145
2 mΩ to 200 mΩ
3 W ( 2 mΩ to 10 mΩ)
2 W (>10 mΩ to 200 mΩ)
38 A
Document No.: 63166
Revision: 06-Jul-2017
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foil@vpgsensors.com
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1
303144, 303145
Figure 2 – Dimensions and Imprinting
in inches (millimeters)
303144 DIMENSIONS
303145 DIMENSIONS
(1)
(1)
H
H
A
B
L
T
W
A
L
T
W
B
303144 LAND PATTERN
I
1
e
E
1
E
2
I
2
I
Kelvin Connection
I
1
, I
2
- Current
E
1
, E
2
- Sense
a
b
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 (mΩ)
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
0R002 to 0R2
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)
Note
(1)
White dot indicates top side of part for mounting purposes
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Document No.: 63166
Revision: 06-Jul-2017
303144, 303145
GENERAL NOTES
• Tightest absolute tolerance: 0.5% for any value within the pertinent ohmic value range.
• Measurement error allowed for ΔR limits: 0.0005 Ω.
• 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 × (–65°C to +150°C)
ΔR = 0.1%
+170°C, 100 h, no power
In tolerance ΔR = 0.2%
5% PDA on ΔR, 10% PDA on out of tolerance
Magnification 30 × to 60 ×
Dimensions, workmanship, 3 units sample size
Note
(1)
Vishay Foil Resistors 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
(1)
Group 2
Sample size: 3(0)
Solderability
Sample size: 10(0) – mounted on FR4
TCR measurement per
MIL-STD-202, method 304
–55°C/+25°C/+125°C
303144: 3 mΩ to <100 mΩ: ±20 ppm/°C
100 mΩ to 200 mΩ: ±25 ppm/°C
303145: 2 mΩ to ≤3 mΩ: ±25 ppm/°C
>3 mΩ to <100 mΩ: ±20 ppm/°C
100 mΩ to 200 mΩ: ±25 ppm/°C
ΔR = 0.2%
–55°C ±2°C, 24 h ±4 h
ambient no load dwell for 2 h to 8 h at +25°C
ΔR = 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
ΔR = 0.5%
5 × rated power at +25°C for 5 s,
not to exceed maximum current rating
ΔR = 0.05%
10 s to 12 s at +260°C reflow method
ΔR = 0.05%
240 h, no power
ΔR = 0.05%
100G, 6 ms axes Z and Y, 10 shocks per axis
ΔR = 0.05%
10 Hz to 2000 Hz, 20G 2 axes, 6 h per axis
ΔR = 1%
2000 h, +70°C, rated power
MIL-STD-202, method 208
Group 3
Low temperature storage per MIL-PRF-49465
Low temperature operation per MIL-PRF-55342
Short time overload per MIL-STD-49465
Sample size: 9(0) – mounted on FR4
Group 4
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
Sample size: 12(0) – mounted on FR4
Group 6
Life test per MIL-PRF-49465
(1)
Units selected randomly from lots which successfully passed the table 2A testing
Document No.: 63166
Revision: 06-Jul-2017
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foil@vpgsensors.com
www.vishayfoilresistors.com
3
303144, 303145
Table 3 – EEE-INST-002 (Table 3A Film/Foil, Level 1) Destructive Tests – MIL-PRF-49465
(1)
, Cont.
Sample Size: 10(0) – mounted on FR4
Group 7B
Solder mounting integrity per MIL-PRF-55342
Sample size: 5(0) – mounted on FR4
Group 9
High temperature exposure per MIL-PRF-49465
Sample size:
Group 10
(2)
For 303144: 12
For 303145: 4
Outgassing
Notes
(1)
Units selected randomly from lots which successfully passed the table 2A testing
(2)
Optional, per customer request.
Measurement error allowed for ΔR limits: 0.0005 Ω.
Per ASTM E595
ΔR = 0.3%
1000 h, +170°C ±7°C, no power
303144: 3 kg force, 30 s
303145: 5 kg force, 30 s
Figure 3 – Part Number Information
Model #
Base Model
CSM2512
303144
CSM3637
303145
Value Range
Part Number:
3m
to 200 m
2m
to 200 m
{Model} - {Value} - {Tolerance} - {Termination} - {Packaging}
Absolute Tolerance
0.5%
Code
D
Termination
Tin/lead
Code
B
Packaging
Tape and reel
Waffle
Code
W
T
Example:
303144 - 0R1 - DBW
303144, 100 m
, 0.5%, tin/lead termination, waffle packaging
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foil@vpgsensors.com
Document No.: 63166
Revision: 06-Jul-2017
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Vishay Precision Group, Inc.
Disclaimer
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Document No.: 63999
Revision: 15-Jul-2014
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