RTOP
Vishay Sfernice
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
FEATURES
•
1 % tolerance available
•
High power rating = 200 W
•
Wide ohmic value range = 0.046 to 1 MΩ
•
Non inductive
•
Easy mounting
•
Low thermal rzpadiation of the case
•
Standard Isotop case (SOT 227 B)
RoHS
COMPLIANT
This series of thick film power resistors include modules which can incorporate up to 2 different resistor values in the same
SOT 227B package. Two types of terminations are available along with a 4 terminal device for measurement applications in the
case of the single resistor version. This product range benefits from Vishay Sfernice’s experience in thick film power resistor
technology i.e high power: volume ratio, low tolerance or individual resistors and excellent overload capabilities (due to the
trimming technique).
DIMENSIONS
in millimeters
RTOP
V Connections
10 12.6
4
16
30
39
12.6
25
Ø 4.2
• Tolerances unless otherwise specified: ± 0.3 mm
MECHANICAL SPECIFICATIONS
Mechanical Protection
Substrate
Resistive Element
End Connections
Tightening Torque Connections
Tightening Torque Heatsink
Insulated case
Alumina on insulated base
Cermet
V connections: screw M4 x 6
1 Nm
2 Nm
ELECTRICAL SPECIFICATIONS
Resistance Range
Standard Tolerance
Power Rating
Temperature Coefficient
Standard
0.046 to 1 MΩ
± 1 % to ± 10 %
50 W to 200 W at + 25 °C
ENVIRONMENTAL SPECIFICATIONS
Temperature Range
Climatic Category
- 55 °C to + 125 °C
55/125/56
± 300 ppm/°C (R < 1)
± 150 ppm/°C (R > 1)
> 10
6
MΩ
Insulation Resistance
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1
For technical questions, contact: sfer@vishay.com
Document Number: 50045
Revision: 25-Mar-07
RTOP
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
PERFORMANCE
TESTS
CONDITIONS
NF EN 140000 CEI 115_1
2.5 Pn/5 seconds
NF EN 140000 CEI 68214 Test Na
5 cycles - 55 °C +125 °C
NF EN 140000 CEI 115_1
Pn at 25 °C 1000 hours
MIL STD 202 Method 103 B Test D
56 days 95 % R.H.
TYPICAL DRIFTS
< ± (0.25 % + 0.05
Ω)
< ± (0.25 % + 0.05
Ω)
< ± (0.5 % + 0.05
Ω)
< ± (0.5 % + 0.05
Ω)
Vishay Sfernice
Momentary Overload
Rapid Temperature Change
Load Life
Humidity (Steady State)
SPECIAL FEATURES
MODEL
Power Rating at + 25 °C
chassis mounted resistors
unmounted resistors
Thermal Resistance (per resistor)
Limiting Voltage
Dielectric Strength
1)
connections/chassis
Dielectric Strength
1)
connections/resistors
Ohmic Value Range
Tolerance
RTOP 200
RTOP 100
DRTOP 100
DRTOP 50
200 W
5W
0.5 °C/W
1500 V
2500 V, 1 Minute
10 mA Max
-
0.046 to 1 MΩ
± 1 % to ± 10 %
100 W
5W
1 °C/W
1500 V
2500 V, 1 Minute
10 mA Max
-
100 W
3.5 W
0.5 °C/W
500 V
2500 V, 1 Minute
10 mA Max
2500 V, 1 Minute
10 mA Max
50 W
3.5 W
1 °C/W
500 V
2500 V, 1 Minute
10 mA Max
2500 V, 1 Minute
10 mA Max
0.092 to 1 MΩ
± 1 % to ± 10 %
R
Electrical Diagrams
R2
R1
R
Shunt Version
Note
1. MIL STD 202 Method 301
Document Number: 50045
Revision: 25-Mar-07
For technical questions, contact: sfer@vishay.com
www.vishay.com
2
RTOP
Vishay Sfernice
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
OVERLOADS
The applied power is 2.5 x rated power for 5 s with a max
voltage of 2 x nominal voltage.
Accidental overload:
The values indicated in the graph
below are applicable to resistors in air or mounted onto a
heatsink.
In case of multi-resistor devices, (DRTOP, TROP and
QROP) the results apply to each resistor value in the device.
CHOICE OF THE HEATSINK
The user must choose the heatsink 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:
ΔT
-
P
=
----------------------------------------------------------------------
(
1
)
[
RTH
(
j
–
c
)
+
RTH
(
c
–
a
) ]
P:
expressed in W
ΔT:
difference between maximum working temperature
and room temperature.
R
TH
: (j-c): thermal resistance value measured between
resistive layer and outer side of the resistor. It is the
thermal resistance of the component (see Table
Special Features).
R
TH
: (c-a): thermal resistance value measured between
outer side of the resistor and room temperature. It is
the thermal resistance of the heatsink depending on
the heatsink itself (type, shape) and the quality of the
fastening device.
Example:
R
TH
: (c-a) for RTOP 200 power rating 130 W at ambient
temperature + 30 °C.
Thermal resistance (see table 1) R
TH
(j-c): 0.5 °C/W
ΔT ≤
125 °C - 30 °C -
≤
95 °C
ΔT
95
R
TH
(j - c)
+
R
TH
(c - a)
=
-------
=
---------
=
0.73 °C/W
-
P
130
R
TH
(j - c)
≤
0.5 °C/W
R
TH
(c - a)
≤
0.73 °C/W - 0.5 °C/W
≤
0.23 °C/W
RECOMMENDATIONS FOR MOUNTING
ONTO A HEATSINK
Surfaces in contact must be carefully cleaned.
The heatsink must have an acceptable flatness:
from 0.05 mm to 0.1 mm/100 mm.
Roughness of the heater must be around 6.3 µm.
In order to improve thermal conductivity, surfaces in contact
(alumina, heatsink) are laid on with a silicone grease (type SI
340 from Rhône-Poulenc or Dow 340 from Dow Corning).
Tightening torque on heater: 2 Nm
For the electrical connections, it is recommended to use
M4 x 6 screws and if necessary a washer of 1mm thickness.
The recommended screw tightening torque is 1 Nm.
ENERGY CURVE
1000
100
ENERGY IN JOULES
10
1
0.1
0.01
1.10
-7
1.10
-6
1.10
-5
1.10
-4
1.10
-3
1.10
-2
1.10
-1
1
OVERLOAD DURATION IN SECONDS
RTOP
DRTOP
www.vishay.com
3
For technical questions, contact: sfer@vishay.com
Document Number: 50045
Revision: 25-Mar-07
RTOP
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
POWER RATING CHART
The temperature of the heater should be maintained in the limit specified. To improve the thermal conductivity, surfaces in
contact should be laid on with a silicon grease and the torque applied on the screw for tightening should be around 2 Nm.
100
Vishay Sfernice
80
% RATED POWER
60
40
20
0
0
20
40
60
80
100
120
140
HEATSINK TEMPERATURE IN DEGREES CELSIUS
MARKING
Series, style, ohmic value (in), tolerance (in %), manufacturing date, VISHAY trade mark.
PACKAGING
Base of 10 units
ORDERING INFORMATION
RTOP
DRTOP
MODEL
RTOP
DRTOP
200
50
STYLE
100
50
5U
150U
OHMIC
VALUE
±1%
5%
15U
R1
T1
±%
5%
R2
CONNECTIONS
V: Screw
VS: RTOP Shunt
CUSTOM
DESIGN
Optional
PACKAGING
LEAD
(Pb)-FREE
V
V
XXX
BO10
e
ABSOLUTE TOLERANCE PER
RESISTOR
Optional
±1%
±2%
±5%
± 10 %
To be precise
for each
resistor
SAP PART NUMBERING GUIDELINES
RTOP
200
V
5R00
VALUE
DRTOP
MODEL
050
STYLE
V
CONNECTIONS
151
VALUE 1
151
VALUE 2
J
TOLERANCE
B
PACKAGING
F
B
Document Number: 50045
Revision: 25-Mar-07
For technical questions, contact: sfer@vishay.com
www.vishay.com
4
Legal Disclaimer Notice
Vishay
Notice
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's
terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express
or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify Vishay for any damages resulting from such improper use or sale.
Document Number: 91000
Revision: 08-Apr-05
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