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RPS 500
Vishay Sfernice
Power Resistors for Mounting onto a Heatsink
Thick Film Technology
FEATURES
• High power rating: 500 W
• High overload capability up to 2 times rated
Power (see energy curve)
• Heatsink mounting
• Low thermal radiation of the case
This range has been developed specifically for electrical traction applications and is capable of dissipating 500 W at + 70 °C. The
remarkable performance characteristics are evident when used in severe pulse conditions. The copper base allows easy
mounting on the heatsink and provides optimal dissipation conditions.
DIMENSIONS in millimeters
RPS 500D
73
56
RPS 500A
73
56
RoHS
COMPLIANT
6
10.5
26 ± 1
Ø 7.2
60
Ø 21
* Tolerances unless stated: ± 0.2 mm
Ø 4.2
57
33.5
35.8
2 M4 USEFUL
DEPTH: 8
MECHANICAL SPECIFICATIONS
Mechanical Protection Insulated case
Substrate Alumina onto base of
nickel coated copper
Resistive Element
Cermet
End Connections Screws M4 (M5 on
request)
Tightening Torque on Connections 2 Nm
Tightening Torque on Heatsink 4 Nm
Weight 250 g ± 10 %
ENVIRONMENTAL SPECIFICATIONS
Temperature Range - 55 °C to + 125 °C
10.5
6
Ø 21
26 ± 1
Ø 7.2
60
Ø 4.2
57
38.1
ELECTRICAL SPECIFICATIONS
Resistance Range 0.24 to 1M E24 series
Tolerances ± 1 % to ± 10 %
Rated Power (Pr
Chassis Mounted at 70 °C
(Case Temperature)
Thermal Resistance of the
Component
Temperature Coefficient, TC
Limiting Element Voltage U
Dielectric Strength
Insulation Resistance
Inductance < 50 nH
)
70
(1)
500 W continuous load
R
: 0.11 °C/W
th(j-c)
± 300 ppm/°C < 1 Ω
± 150 ppm/°C > 1 Ω
L
MIL STD 202 Method 301:
> 10
5 kV
L: 7 kV
6
MΩ under U
- H: 12 kV
RMS
1 min/10 mA max.
IEC 60115-1
RMS
2 M4 USEFUL
DEPTH: 8
RMS
= 500 V
ins
DC
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50047
1 Revision: 14-Nov-08
RPS 500
Power Resistors for Mounting onto a Heatsink
Vishay Sfernice
Thick Film Technology
PERFORMANCE
TESTS CONDITIONS REQUIREMENTS
Momentary Overload
Rapid Temperature Change
Load Life (Chassis Mounted)
Humidity (Steady State)
Note:
(1)
Resistors are not tested and guaranteed in cycling conditions
IEC 60115-1/IEC60068-2-14 Test Na
Pr (i.e. 500 W)/1000 h/70 °C (no cycling)
MIL STD 202 Method 103 B and D
RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR
Ohmic < 1 Ω > 1 Ω
Standard Tolerance ± 5 % ± 5 %
Standard TCR (- 55 °C to + 125 °C) ± 300 ppm/°C ± 150 ppm/°C
Tolerance on Request ± 1 %, ± 2 %, ± 10 %
IEC 60115-1
2 Pr/10 s U
5 cycles - 55 °C to + 125 °C
56 days 95% RH/40 °C
= 5000 V
L
IEC 60115-1
< ± (0.25 % + 0.05 Ω)
< ± (0.25 % + 0.05 Ω)
(1)
< ± (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 ratio:
-------------------------------------------------------------
P
=
R
ΔT
+[]
TH j c–()RTH c a–()
1()
P: Expressed in W
ΔT: Difference between maximum working temperature and room temperature.
R
: Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal
TH (j - c)
resistance of the component: 0.11 °C/W.
R
: Thermal resistance value measured between outer side of the resistor and room temperature. It is the thermal
TH (c - 4)
resistance of the heatsink, depending on the heatsink itself (type, shape) and the quality of the fastening device.
RECOMMENDATIONS FOR MOUNTING ONTO A HEATSINK
Surfaces in contact must be carefully cleaned.
The heater must have an acceptable flatness: 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 silicon grease (type
SI 340 Rhône-Poulenc or Dow Corning).
The fastening of the resistor to the heatsink is under pressure control of two screws tightened at 4 Nm for full power availability
The following accessories are supplied with each product: 2 off CHC M4 x 16/16 class 12.9 for heatsink mounting,
2 off TH M4 x 6/6 and 2 M4 contact lock washers for connections.
Document Number: 50047 For technical questions, contact: sfer@vishay.com
Revision: 14-Nov-08 2
www.vishay.com
RPS 500
Vishay Sfernice
Power Resistors for Mounting onto a Heatsink
Thick Film Technology
OVERLOADS
Short time overload: 2 Pn/10 s
Accidental overload: The values indicated in the graph below are applicable to resistors in air or mounted onto a heatsink.
ENERGY CURVE
10 000
1000
100
ENERGY IN JOULES
10
1
-7
-6
1.10
1.10
-5
1.10
OVERLOAD DURATION IN S
-4
1.10-31.10-21.10
1.10
POWER RATING CHART
The heatsink temperature should be maintained at the values specified in fig. 2.
To optimise the thermal conduction, contacting surfaces should be coated with silicone grease and heatsink mounting screws
tightened to 4 Nm.
100
-1
1
80
60
40
% RATED POWER
20
0
0 20 40 60 80 100 120 140
HEATSINK TEMPERATURE IN °C
PACKAGING
Box of 15 units
MARKING
Series, style, ohmic value (in ), tolerance (in ), tolerance (in %), manufacturing date, VISHAY trade mark.
ORDERING INFORMATION
RPS 500 DH 100 Ω 10 % XXX BO15 E
MODEL STYLE CONNECTIONS
Optional
H: Dielectric
strength 12 kV
L: Dielectric
strength 7 kV
RESISTANCE VALUE TOLERANCE
± 1 %
± 2 %
± 5 %
± 10 %
CUSTOM DESIGN
Options
on request
TCR, shape,
etc.
PACKAGING LEAD (Pb)-FREE
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50047
3 Revision: 14-Nov-08
RPS 500
Power Resistors for Mounting onto a Heatsink
Thick Film Technology
SAP PART NUMBERING GUIDELINES
0500DH4 R JP SR 70B
GLOBAL
MODEL
RPS500 D = Diagonal
STYLE DIELECTRIC OHMIC VALUE TOLERANCE PACKAGING SPECIAL
H = Dielectric
connections
A = Straight
connections
strength 12 kV
L = Dielectric
strength 7 kV
The first four digits are
significant figures and the
last digit specifies the
number of zeros to follow.
R designates decimal point.
48R70 = 48.7 Ω
47R0 = 47 Ω
1001 = 1 kΩ
4R70 = 4.7 Ω
R240 = 0.24 Ω
F = 1 %
G = 2 %
J = 5 %
K = 10 %
Vishay Sfernice
B = Box 15 pieces
N = Box 15 pieces
N/A (1 to 14 pieces
by Box)
As applicable
ZAx.
Document Number: 50047 For technical questions, contact: sfer@vishay.com
Revision: 14-Nov-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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