RHC Series
High Power Thick Film Chip Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Features:
•
•
•
•
•
•
Handles 2W of power
Resistances from 0.1Ω to 1MΩ
RoHS compliant and halogen free
TCR of ± 100 ppm/ºC
1% and 5% tolerances
Runs significantly cooler than standard thick film 2512 chip
Electrical Specifications
Electrical Specifications
Maximum
Working
Voltage
(1)
Type / Code
Package
Type
Power Rating
(Watts) @ 70ºC
Maximum
Overload
Voltage
Resistance
Temperature
Coefficient
Ohmic Range (Ω) and Tolerance
1%, 5%
RHC2512
2512
2W
200V
Note: (1) Lesser of √P*R or maximum working voltage
400V
±100 ppm/ºC
0.1 - 1M
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
RHC2512
L
Body Length
0.248 ± 0.008
6.30 ± 0.20
W
Body Width
0.126 ± 0.008
3.20 ± 0.20
H
Body Height
0.024 ± 0.004
0.60 ± 0.10
a
Top Termination
0.028 ± 0.008
0.70 ± 0.20
b
Bottom Termination
0.087 ± 0.008
2.20 ± 0.20
Unit
inches
mm
Recommended Pad Layout
Type / Code
RHC2512
L
Total Length
0.315
8.00
W
Total Width
0.138
3.50
D
Pad Depth
0.118
3.00
Unit
inches
mm
Performance Characteristics
Test
Moisture Resistance
Load Life
Resistance to Soldering
Temperature Cycling
Thermal Shock
Short Time Overload
Insulation Resistance
Typical
±1% + 0.05Ω for <10Ω and ±1% for ≥10Ω
≥1MΩ
Operating Temperature Range: -55ºC to +155ºC
Rev Date: 04/30/2018
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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RHC Series
High Power Thick Film Chip Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Power Derating Curve:
100
-55ºC
70ºC
Percent Rated Power (%)
80
60
40
20
155ºC
0
-60
0
20
40
60
80
100
120
140
160
180
Ambient Temperature (ºC)
Hot Spot and Terminal Temp.:
Cº
140
120
100
80
60
40
20
0
0
Hot Spot
Solder Joint
1
2
1
2
Load (w)
1
2
Repeated Overload:
Test condition:
Voltage (Power): 2.0, 2.25, 2.5, 2.75, 3.0, 3,25 times of rated voltage. (8W, 10.1W, 12.5W, 15.1W, 18W, 21.1W)
Applied time:
Each voltage 5 seconds.
As a reference test, the RMC was tested with the same rated voltage and testing substrate.
Rev Date: 04/30/2018
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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RHC Series
High Power Thick Film Chip Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Packaging Specifications – Embossed Plastic Tape
Type
RHC2512
Type
RHC2512
A
0.134 ± 0.004
3.40 ± 0.10
P2
0.079 ± 0.002
2.00 ± 0.05
B
0.260 ± 0.004
6.60 ± 0.10
P0
0.157 ± 0.004
4.00 ± 0.10
W
0.472 ± 0.008
12.00 ± 0.20
D0
0.061 ± 0.002
1.55 ± 0.05
F
0.217 ± 0.002
5.50 ± 0.05
t1
0.010 ± 0.002
0.25 ± 0.05
E
0.069 ± 0.004
1.75 ± 0.10
t2
0.039 ± 0.004
1.00 ± 0.10
P1
0.157 ± 0.004
4.00 ± 0.10
Unit
Inches
mm
Unit
Inches
mm
Reel Specifications
Type
RHC2512
A
7.087 ± 0.118
180.00 ± 3.00
B
2.362 ± 0.039
60.00 ± 1.00
C
0.512 ± 0.008
13.00 ± 0.20
D
0.827 ± 0.031
21.00 ± 0.80
E
0.079 ± 0.020
2.00 ± 0.50
W1
0.512 ± 0.012
13.00 ± 0.30
W2
0.606 ± 0.039
15.40 ± 1.00
Unit
Inches
mm
Rev Date: 04/30/2018
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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RHC Series
High Power Thick Film 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°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 105°C. 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°C heat rise shown here would indicate there will be additional thermal reduction techniques needed
to keep this part under 105°C 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°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, via 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 ≤ 50mΩ.
This should be taken into account when designing.
Rev Date: 04/30/2018
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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RHC Series
High Power Thick Film Chip Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
RoHS Compliance
Stackpole Electronics has joined the worldwide effort to reduce the amount of lead in electronic components and to
meet the various regulatory requirements now prevalent, such as the European Union’s directive regarding “Restrictions
on Hazardous Substances” (RoHS 2). As part of this ongoing program, we periodically update this document with the
status regarding the availability of our compliant components. All our standard part numbers are compliant to EU
Directive 2011/65/EU of the European Parliament.
RoHS Compliance Status
Standard
Product
Series
RHC
Description
Package /
Termination
Type
SMD
Standard
Series
RoHS
Compliant
YES(1)
Lead-Free Termination
Composition
Lead-Free
Mfg. Effective Date
(Std Product Series)
Jul-04
Lead-Free
Effective Date
Code
(YY/WW)
04/27
High Power Thick Film
Surface Mount Chip Resistor
Note (1): RoHS Compliant by means of exemption 7c-I.
100% Matte Sn over Ni
“Conflict Metals” Commitment
We at Stackpole Electronics, Inc. are joined with our industry in opposing the use of metals mined in the “conflict region”
of the Eastern Democratic Republic of the Congo (DRC) in our products. Recognizing that the supply chain for metals
used in the electronics industry is very complex, we work closely with our own suppliers to verify to the extent possible
that the materials and products we supply do not contain metals sourced from this conflict region. As such, we are in
compliance with the requirements of Dodd-Frank Act regarding Conflict Minerals.
Compliance to “REACH”
We certify that all passive components supplied by Stackpole Electronics, Inc. are SVHC (Substances of Very High
Concern) free and compliant with the requirements of EU Directive 1907/2006/EC, “The Registration, Evaluation,
Authorization and Restriction of Chemicals”, otherwise referred to as REACH. Contact us for complete list of REACH
Substance Candidate List.
Environmental Policy
It is the policy of Stackpole Electronics, Inc. (SEI) to protect the environment in all localities in which we operate. We
continually strive to improve our effect on the environment. We observe all applicable laws and regulations regarding
the protection of our environment and all requests related to the environment to which we have agreed. We are
committed to the prevention of all forms of pollution.
Rev Date: 04/30/2018
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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