RTOP
www.vishay.com
Vishay Sfernice
Power Resistors for Mounting Onto a Heatsink
Thick Film Technology
FEATURES
• 1 % tolerance available
• High power rating = 200 W
• Wide ohmic value range = 0.046 Ω to 1 MΩ
• Non inductive
• Easy mounting
• Low thermal radiation of the case
• Standard isotope case (SOT-227 B)
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
LINKS TO ADDITIONAL RESOURCES
3D 3D
3D Models
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
15 ± 0.3
10 12.6
30
38
4
12.6
25
Ø 4.2
Note
• Tolerances unless otherwise specified: ± 0.3 mm
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
DRTOP50
RTOP100
DRTOP100
RTOP200
SIZE
SOT-227B
RATED POWER
P25 °C
W
TOLERANCE
±%
TEMPERATURE
COEFFICIENT
± ppm/°C
0.091 to 1M
50
1, 2, 5, 10
150, 300
0.046 to 1M
100
1, 2, 5, 10
150, 300
0.046 to 1M
200
1, 2, 5, 10
150, 300
RESISTANCE RANGE
Ω
MECHANICAL SPECIFICATIONS
Flammability
Resistive Element
Substrate
End Connections
ENVIRONMENTAL SPECIFICATIONS
Insulated case
Cermet
V connections: screw M4 x 6
1 Nm
Tightening Torque Heatsink
2 Nm
Revision: 13-Apr-2021
-55 °C to +125 °C
Climatic Category
55 / 125 / 56
Alumina on insulated base
Tightening Torque Connections
Weight
Temperature Range
30 g max.
TECHNICAL SPECIFICATIONS
Temperature Coefficient
(-55 °C to +125 °C)
Insulation Resistance
Standard
± 300 ppm/°C (R < 1)
± 150 ppm/°C (R > 1)
> 106 MΩ
Document Number: 50045
1
For technical questions, contact: sferfixedresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
RTOP
www.vishay.com
Vishay Sfernice
PERFORMANCE
TESTS
CONDITIONS
REQUIREMENTS
IEC 60115-1
2.5 Pr/5 s US < 2 UL
< ± (0.25 % + 0.05 Ω)
IEC 60115-1
5 cycles, -55 °C, +125 °C
< ± (0.25 % + 0.05 Ω)
IEC 60115-1
Pr at 25 °C, 1000 h
< ± (0.5 % + 0.05 Ω)
IEC 60115-1 / IEC 60068-2-3 Test Ca
56 days, 95 % RH / 40 °C
< ± (0.5 % + 0.05 Ω)
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 UL
Dielectric Strength (1)
Connections/Chassis
Dielectric Strength (1)
Connections/Resistors
RTOP 200
RTOP 100
DRTOP 100
DRTOP 50
200 W
5W
100 W
5W
100 W
3.5 W
50 W
3.5 W
0.5 °C/W
1 °C/W
0.5 °C/W
1 °C/W
1500 V
1500 V
500 V
500 V
2500 V, 1 min
10 mA max.
2500 V, 1 min
10 mA max.
2500 V, 1 min
10 mA max.
2500 V, 1 min
10 mA max.
-
-
2500 V, 1 min
10 mA max.
2500 V, 1 min
10 mA max.
Ohmic Value Range
0.046 Ω to 1 MΩ
0.091 Ω to 1 MΩ
Tolerance
± 1 % to ± 10 %
± 1 % to ± 10 %
R
R2
R1
Electrical Diagrams
R
Shunt version
Note
(1) MIL-STD-202 method 301
Revision: 13-Apr-2021
Document Number: 50045
2
For technical questions, contact: sferfixedresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
RTOP
www.vishay.com
Vishay Sfernice
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 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)
RTOP
Tightening Torque on Heatsink
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
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 = ------------------------------------------------------------------------------------------R TH (j - c) + R TH (c - h) + R TH (h - a)
P:
Expressed in W
ΔT:
Difference between maximum working temperature and room temperature
RTH (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)
RTH (c - h): Thermal resistance value measured between outer side of the resistor and upper side of the heatsink
This is the thermal resistance of the interface (grease, thermal pad), and the quality of the fastening device
RTH (h - a): Thermal resistance of the heatsink
Example:
RTH (c - a): For RTOP 200 power rating 130 W at ambient temperature +30 °C.
Thermal resistance (see table 1) RTH (j - c): 0.5 °C/W
ΔT = 125 °C - 30 °C ≤ 95 °C
ΔT
95
RTH (j - c) + RTH (c - h) + RTH (h - a) = ------- = ------- = 0.73 °C/W
P
130
RTH (j - c) = 0.112 °C/W
RTH (c - h) + RTH (h - a) = 0.73 °C/W - 0.5 °C/W ≤ 0.23 °C/W
Revision: 13-Apr-2021
Document Number: 50045
3
For technical questions, contact: sferfixedresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
RTOP
www.vishay.com
Vishay Sfernice
OVERLOADS
POWER RATING
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.
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
RATED POWER IN %
ENERGY CURVE
ENERGY IN JOULES
1000
100
RTOP
10
DRTOP
1
80
60
40
20
0.1
0
0
0.01
10-7
20
40
60
80
100
120
140
HEATSINK TEMPERATURE IN °C
10-6
10-5
10-4
10-3
10-2
10-1
100
OVERLOAD DURATION IN s
PACKAGING
POWER CURVE
Box of 10 units
1 000 000
POWER IN W
100 000
10 000
RTOP
DRTOP
1000
100
10-7
10-6
10-5
10-4
10-3
10-2
10-1
100
OVERLOAD DURATION IN s
MARKING
Series, style, ohmic value (in), tolerance
manufacturing date, Vishay Sfernice trademark.
Revision: 13-Apr-2021
(in
%),
Document Number: 50045
4
For technical questions, contact: sferfixedresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
RTOP
www.vishay.com
Vishay Sfernice
ORDERING INFORMATION
RTOP
200
5U
DRTOP
50
150U
±1%
5%
±%
15U
5%
R1
MODEL
STYLE
RTOP
DRTOP
100
50
OHMIC
VALUE
V
T1
XXX
BO10
e
CONNECTIONS
CUSTOM
DESIGN
PACKAGING
LEAD
(Pb)-FREE
V: screw
VS: RTOP shunt
Optional
R2
ABSOLUTE TOLERANCE PER
RESISTOR
To be precise for
each resistor
Optional
±1%
±2%
±5%
± 10 %
V
GLOBAL PART NUMBER INFORMATION
T
R
O
P
1
0
0
V
5
R
0
0
J
B
MODEL
SIZE
LEADS
OHMIC VALUE
TOLERANCE
PACKAGING
SPECIAL
RTOP
100
200
V = screw
VS = RTOP shunt
The first three digits are
significant figures and the
last digit specifies the
number of zeros to follow.
R designates decimal point.
48R7 = 48.7 Ω
4871 = 4870 Ω
1002 = 10 000 Ω
R010 = 0.01 Ω
R680 = 0.68 Ω
2710 = 2.7 kΩ
F=1%
G=2%
J=5%
K = 10 %
B = box
10 pieces
As applicable
Ex = UA1
GLOBAL PART NUMBER INFORMATION
D
R
T
GLOBAL
MODEL
DRTOP
Revision: 13-Apr-2021
O
P
0
5
0
V
1
0
3
1
0
3
J
B
SIZE
LEADS
VALUE No. 1
VALUE No. 2
TOLERANCE
PACKAGING
SPECIAL
050
100
V = screw
The first two
digits are
significant
figures and the
last digit
specifies the
number of
zeros to follow.
R designates
decimal point.
103 = 10 kΩ
470 = 47.0 Ω
222 = 2.20 kΩ
The first two
digits are
significant
figures and the
last digit
specifies the
number of
zeros to follow.
R designates
decimal point.
103 = 10 kΩ
470 = 47.0 Ω
222 = 2.20 kΩ
F=1%
G=2%
J=5%
K = 10 %
B = box
10 pieces
As applicable
Ex = UA1
Document Number: 50045
5
For technical questions, contact: sferfixedresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
RTOP
www.vishay.com
Vishay Sfernice
GLOBAL PART NUMBER INFORMATION
D
R
T
O
P
MODEL
SIZE
LEADS
DRTOP
050
100
V = screw
1
0
0
V
1
0
VALUE (two values are
identical and cannot be coded
in three digits) in four digits
The first three digits are
significant figures and the
last digit specifies the
number of zeros to follow.
R designates decimal point.
1012 = 10.1 kΩ
48R7 = 48.7 Ω
2241 = 2.24 kΩ
1
2
J
B
TOLERANCE
PACKAGING
SPECIAL
F=1%
G=2%
J=5%
K = 10 %
B = box
10 pieces
As applicable
Ex = UA1
RELATED DOCUMENTS
APPLICATION NOTES
Potentiometers and Trimmers
www.vishay.com/doc?51001
Guidelines for Vishay Sfernice Resistive and Inductive Components
www.vishay.com/doc?52029
Revision: 13-Apr-2021
Document Number: 50045
6
For technical questions, contact: sferfixedresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
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RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
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“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
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liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
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about the suitability of products for a particular application. It is the customer's responsibility to validate that a particular product
with the properties described in the product specification is suitable for use in a particular application. Parameters provided in
datasheets and / or specifications may vary in different applications and performance may vary over time. All operating
parameters, including typical parameters, must be validated for each customer application by the customer's technical experts.
Product specifications do not expand or otherwise modify Vishay's terms and conditions of purchase, including but not limited
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Revision: 01-Jan-2022
1
Document Number: 91000
