CSRF Series
Foil on Ceramic Current Sensing Chip Resistor
Features:
•
•
•
•
•
•
•
High power rating – up to 2W
Low inductance – typically less than 0.2nH
Wide resistance range (0.003Ω – 0.100Ω)
Current handling up to 40 amps
TCR down to ±50 ppm/°C
Non-standard resistance values available
RoHS compliant / lead-free
Stackpole Electronics, Inc.
Resistive Product Solutions
Electrical Specifications
Type / Code
CSRF0805
CSRF1206
CSRF2010
CSRF2512
Old Package
Code
NA
1/2
1
2
Power Rating (Watts)
@ 70ºC
0.5W
0.5W
1W
2W
Resistance Temperature
Coefficient(1)
±50 ppm/ºC
±100 ppm/ºC
±50 ppm/ºC
±100 ppm/ºC
±50 ppm/ºC
±100 ppm/ºC
±50 ppm/ºC
Ohmic Range (Ω) and Tolerance
1%
5%
0.010 - 0.100
0.005 - 0.010
0.011 - 0.100
0.003 - 0.010
0.011 - 0.100
0.003 - 0.010
0.011 - 0.100
0.010 - 0.100
0.005 - 0.010
0.011 - 0.100
0.003 - 0.010
0.011 - 0.100
0.003 - 0.010
0.011 - 0.100
(1) Contact factory for TCR parameter for values below 0.01Ω
Please refer to the High Power Resistor Application Note (page 4) for more information on designing and
implementing high power resistor types.
Mechanical Specifications
Type / Code
CSRF0805
CSRF1206
CSRF2010
(3mΩ - 5mΩ)
CSRF2010
(≥5mΩ)
CSRF2512
(3mΩ - 5mΩ)
CSRF2512
(≥6mΩ)
L
Body Length
0.079 ± 0.008
2.00 ± 0.20
0.126 ± 0.008
3.20 ± 0.20
0.197 ± 0.010
5.00 ± 0.25
0.197 ± 0.010
5.00 ± 0.25
0.250 ± 0.010
6.35 ± 0.25
0.252 ± 0.008
6.40 ± 0.20
W
Body Width
0.049 ± 0.006
1.25 ± 0.15
0.063 ± 0.008
1.60 ± 0.20
0.098 ± 0.008
2.50 ± 0.20
0.098 ± 0.008
2.50 ± 0.20
0.126 ± 0.008
3.20 ± 0.20
0.126 ± 0.008
3.20 ± 0.20
H
Body Height
0.024 ± 0.008
0.60 ± 0.20
0.030 ± 0.010
0.75 ± 0.25
0.039 ± 0.006
1.00 ± 0.15
0.039 ± 0.006
1.00 ± 0.15
0.035 ± 0.012
0.90 ± 0.30
0.031 ± 0.006
0.80 ± 0.15
a
Top Termination
0.016 ± 0.010
0.40 ± 0.25
0.020 ± 0.008
0.50 ± 0.20
0.037 ± 0.006
0.95 ± 0.15
0.031 ± 0.006
0.80 ± 0.15
0.039 ± 0.006
1.00 ± 0.15
0.037 ± 0.010
0.95 ± 0.25
b
Bottom Termination
0.020 ± 0.014
0.50 ± 0.35
0.022 ± 0.010
0.55 ± 0.25
0.037 ± 0.006
0.95 ± 0.15
0.031 ± 0.006
0.80 ± 0.15
0.039 ± 0.006
1.00 ± 0.15
0.039 ± 0.012
1.00 ± 0.30
Unit
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
Rev Date: 06/07/2012
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
1
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CSRF Series
Foil on Ceramic Current Sensing Chip Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Performance Characteristics
Test
Load Life
Test Method
MIL-STD-202F-Method 108A
RCWV at 70°C; 1.5hrs ON; 0.5hrs OFF
Total 1024 ± 24hrs
MIL-STD-202F-Method 210E
260 ± 5°C for 10 ± 1sec
MIL-STD-202F-Method 208H
245 ± 5°C for 2 ± 0.5sec
MIL-STD-202F-Method 107G
-55°C to 150°C, 100 cycles
JIS-C-5202-5.5
5x rated power for 5 sec
125ºC: 1000 hous
MIL- STD-202F-Method 106G
MIL-STD-202F-Method 302
Apply 100Vdc for 1 minute
Test Specification
± 1%
Typical
≤
0.5%
Resistance to Soldering Heat
Solderability
Thermal Shock
Short Time Overload
High Temperature Exposure
Moisture Resistance
Insulation Resistance
Operating Temperature Range: -55°C to +170°C
± 1%
minimum 95% coverage
± 1%
± 1%
± 1%
± 1%
1MΩ minimum
≤
0.3%
> 95%
≤
0.3%
≤
0.3%
≤
0.2%
≤
0.5%
≥
1MΩ
Power Derating Curve:
100
Percent Rated Power (%)
80
60
40
20
-55ºC
80ºC
170ºC
0
-60
-40
-20
0
20
40
60
80
100
Ambient Temperature (ºC)
120
140
160
180
Rev Date: 06/07/2012
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
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marketing@seielect.com
CSRF Series
Foil on Ceramic Current Sensing Chip Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
High Power Chip Resistors and Thermal Management
Stackpole has developed several surface mount resistor series in addition to our current sense resistors,
which have had higher power ratings than standard resistor chips. This has caused some uncertainty and
even confusion by users as to how to reliably use these resistors at the higher power ratings in their designs.
The data sheets for the RHC, RMCP, RNCP, CSR, CSRN, CSRF, CSS, and CSSH state that the rated
power assumes an ambient temperature of no more than 100 degrees C for the CSS / CSSH series and 70
degrees C for all other high power resistor series. In addition, IPC and UL best practices dictate that the
combined temperature on any resistor due to power dissipated and ambient air shall be no more than 105C.
At first glance this wouldn’t seem too difficult, however the graph below shows typical heat rise for the CSR
½ 100 milliohm at full rated power. The heat rise for the RMCP and RNCP would be similar. The RHC with
its unique materials, design, and processes would have less heat rise and therefore would be easier to
implement for any given customer.
The 102 degrees C heat rise shown here would indicate there will be additional thermal reduction techniques
needed to keep this part under 105C total hot spot temperature if this part is to be used at 0.75 watts of
power. However, this same part at the usual power rating for this size would have a heat rise of around 72
degrees C. This additional heat rise may be dealt with using wider conductor traces, larger solder pads and
land patterns under the solder mask, heavier copper in the conductors, vias through PCB, air movement, and
heat sinks, among many other techniques. Because of the variety of methods customers can use to lower
the effective heat rise of the circuit, resistor manufacturers simply specify power ratings with the limitations
on ambient air temperature and total hot spot temperatures and leave the details of how to best accomplish
this to the design engineers. Design guidelines for products in various market segments can vary widely so it
would be unnecessarily constraining for a resistor manufacturer to recommend the use of any of these
methods over another.
Note:
The final resistance value can be affected by the board layout and assembly process, especially the size of the
mounting pads and the amount of solder used. This is especially notable for resistance values
≤
50 mΩ.
This should be taken into account when designing.
Rev Date: 06/07/2012
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
4
www.seielect.com
marketing@seielect.com
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