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RPH 100
Vishay Sfernice
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
FEATURES
• High power rating
• Low thermal radiation of the case
• Wide ohmic value range
• Easy mounting
• High overload capabilities
• Reduced size and weight
This new style has been developed as an extension to RCH range. Through the use of thick film technology, a non-inductive
solution for power resistors is available which are rated up to 100 W at + 25 °C. The terminations position prevents any risk of an
electrical arc to the heatsink. This resistor series can replace and offer advantages to standard wirewound devices.
DIMENSIONS in millimeters
RPH 100
Ø 4.2
Ø 4.2
V Connections
42.4
65.5
35
4
16.6
26 37
18.6 21.6
46.7
MECHANICAL SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
Mechanical Protection Insulated case
Substrate Alumina on metallic
base of nickel coated
aluminum
Resistive Element Cermet
End Connections V connections:
Screws M4 x 6
Tightening Torque Connections 1 Nm
Tightening Torque Heatsink 3 Nm
Weight 60 g
ENVIRONMENTAL SPECIFICATIONS
Thermal Resistance RTH (j-c) 0.55 °C/W
Temperature Range - 55 °C + 125 °C
Climatic Category 55/125/56
www.vishay.com For technical questions, contact: sfer@vishay.com
1 Revision: 10-Oct-08
Resistance Range
Toler an ce s
Power Rating:
Continuous
Momentary
Temperature Coefficient
Standard
Limiting Element Voltage
Dielectric Strength MIL STD 202
Insulation Resistance
Inductance
U
L
0.092 Ω to 1 MΩ E24 series
± 1 % to ± 10 %
100 W at 25 °C
chassis mounted 0.45 °C/W
10 W at 25 °C
Free air
400 W at 25 °C for 5 s
± 300 ppm/°C < 1
± 150 ppm/°C > 1
1900 V
5 kV
1 min 10 mA max.
RMS
> 106 M
< 0.1 µH
Document Number: 50046
Ω
Ω
RMS
Ω
RPH 100
Power Resistor for Mounting onto a Heatsink
Vishay Sfernice
Thick Film Technology
PERFORMANCE
TESTS CONDITIONS REQUIREMENTS
Short Time Overload NF EN 140000 CEI 115_1
/5 s US < 2 U
4 P
n
Rapid Temperature Change NF EN 140000 CEI 68214 Test Na
5 cycles - 55 °C + 125 °C
Load Life (Chassis Mounted 0.45 °C/W)
Humidity (Steady State) MIL STD 202 Method 103 B Test D
NF EN 140000
P
at 25 °C 1000 h
n
56 days 95 % RH
L
RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR
Ohmic Value < 1 Ω > 1 Ω
Standard Tolerance ± 5 % ± 5 %
Standard TCR ± 300 ppm/°C ± 150 ppm/°C
Tolerance On Request ± 1 % - ± 2 %
< ± (0.25 % + 0.05 Ω)
< ± (0.25 % + 0.05 Ω)
< ± (0.5 % + 0.05 Ω)
< ± (0.5 % + 0.05 Ω)
CHOICE OF THE HEATSINK
The user must choose according to the working conditions of the component (power, room temperature).
Maximum working temperature must not exceed 125 °C. The dissipated power is simply calculated by the following ratios:
--------------------------------------------------------------- ---=
P
R
TH
ΔT
jc–()RTHca–()+[]
1()
P: Expressed in W
T: Difference between maximum working temperature and room temperature.
R
: (j-c): thermal resistance value measured between resistive layer and outer side of the resistor.
TH
It is the thermal resistance of the component: 0.55 °C/W.
RTH: (c-a): thermal resistance value measured between outer side of the resistor and room temperature.
It is the thermal resistance of the heatsink itself (type, shape) and the quality of the fastening device.
Example:
: (c-a) for RPH 100 power rating 80 W at ambient temperature + 40 °C.
R
TH
Thermal resistance R
(j-c): 0.55 °C/W
TH
Considering equation (1) we have:
ΔT ≤ 125 °C - 40 °C ≤ 85 °C
ΔT
85
-------
(j-c) + RTH (c-a) = = = 1.06 °C/W
R
TH
(c-a) ≤ 1.06 °C/W - 0.55 °C/W ≤ 0.51 °C/W
R
TH
------
P
80
RECOMMENDATIONS FOR MOUNTING ONTO A HEATSINK
Surfaces in contact must be carefully cleaned.
The heatsink must have an acceptable fl atness: from 0.05 mm to 0.1 mm/100 mm.
Roughness of the heatsink must be around 6.3 µm.
In order to improve thermal conductivity, surfaces in contact (alumina, heatsink) should be coated with a silicone grease (type
SI 340 from Rhône-Poulenc or Dow 340 from Dow Corning).
The fastening of the resistor to the heatsink is under pressure control of four screws (not supplied).
Tightening torque: 3 Nm
In order to improve the dissipation, either forced-air cooling or liquid cooling may be used.
Do not forget to respect an insulation value between two resistors (dielectric strength in dry air 1 kV/mm).
Document Number: 50046 For technical questions, contact: sfer@vishay.com
Revision: 10-Oct-08 2
www.vishay.com
RPH 100
Vishay Sfernice
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
OVERLOADS
In any case the applied voltage must be lower than 2 Un.
< 2 Un < 3800 V.
U
max.
Short time overload: 4 P
Accidental overload: The values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink.
/5 s.
n
ENERGY CURVE
1000
100
10
ENERGY IN JOULES
1
0.1
1.10 1.10
-6
-7
1.10
-5
-4
1.10-31.10-21.10
1.10
OVERLOAD DURATION IN s
-1
1
POWER RATING CHART
For resistor mounted onto a heatsink with thermal resistance of 0.45 °C/W.
100
80
60
40
% RATED POWER
20
0
0 20 40 60 80 100 120 140
AMBIENT TEMPERATURE IN °C
MARKING
Series. style, ohmic value (in Ω). tolerance (in %), manufacturing date, SFERNICE trade mark.
ORDERING INFORMATION
RCH 25 3.3 kΩ ± 5 % R XXX
MODEL STYLE RESISTANCE VALUE TOLERANCE
CONNECTIONS
CUSTOM DESIGN
Optional
± 1 %
± 2 %
± 5 %
V: M4 screw
Options
on request
TCR, shape,
etc.
www.vishay.com For technical questions, contact: sfer@vishay.com
Document Number: 50046
3 Revision: 10-Oct-08
RPH 100
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
GLOBAL PART NUMBER INFORMATION
100V100 2 BP HR 0J
GLOBAL
MODEL
RPH 100 F = Faston type
SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING SPECIAL
V = M4 screw
The firts four digits are
significant figures and the
last digit specifies the
number of zeros to follow.
R designates decimal point.
27000 = 2700 Ω = 2K7 Ω
48R70 = 48.7 Ω
48701 = 48 700 Ω
10002 = 100 kΩ
R0100 = 0.01 Ω
R6800 = 0.68 Ω
F = 1 %
G = 2 %
J = 5 %
K = 10 %
Vishay Sfernice
B = Box 5 pieces As applicable
Ex = XXX
Document Number: 50046 For technical questions, contact: sfer@vishay.com
Revision: 10-Oct-08 4
www.vishay.com
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
document or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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