RTOP
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Revision: 06-Apr-18 1Document Number: 50045
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
Power Resistors for Mounting Onto a Heatsink
Thick Film Technology
DESIGN SUPPORT TOOLS
FEATURES
•1 % tolerance available
• High power rating = 200 W
• Wide ohmic value range = 0.046 to 1 M
• 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
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).
Note
• Tolerances unless otherwise specified: ± 0.3 mm
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Available
Models
DIMENSIONS in millimeters
STANDARD ELECTRICAL SPECIFICATIONS
MODEL SIZE RESISTANCE RANGE
RATED POWER
P25 °C
W
TOLERANCE
± %
TEMPERATURE
COEFFICIENT
± ppm/°C
DRTOP50
RTOP100
DRTOP100
RTOP200
SOT-227B
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
12.6
10
4
15 ± 0.3 30 38
12.6
25
Ø 4.2
V Connections
RTOP
MECHANICAL SPECIFICATIONS
Mechanical Protection Insulated case
Resistive Element Cermet
Substrate Alumina on insulated base
End Connections V connections: screw M4 x 6
Tightening Torque Connections 1 Nm
Tightening Torque Heatsink 2 Nm
Weight 30 g max.
ENVIRONMENTAL SPECIFICATIONS
Temperature Range -55 °C to +125 °C
Climatic Category 55 / 125 / 56
TECHNICAL SPECIFICATIONS
Temperature Coefficient
(-55 °C to +125 °C) Standard ± 300 ppm/°C (R < 1)
± 150 ppm/°C (R > 1)
Insulation Resistance > 106 M
RTOP
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Revision: 06-Apr-18 2Document Number: 50045
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
Note
(1) MIL-STD-202 Method 301
PERFORMANCE
TESTS CONDITIONS REQUIREMENTS
Momentary Overload IEC 60115-1
2.5 Pr/5 s US < 2 UL< ± (0.25 % + 0.05 )
Rapid Temperature Change IEC 60115-1
5 cycles, -55 °C, +125 °C < ± (0.25 % + 0.05 )
Load Life IEC 60115-1
Pr at 25 °C, 1000 h < ± (0.5 % + 0.05 )
Humidity (Steady State) IEC 60115-1 / IEC 60068-2-3 Test Ca
56 days, 95 % RH / 40 °C < ± (0.5 % + 0.05 )
SPECIAL FEATURES
MODEL RTOP 200 RTOP 100 DRTOP 100 DRTOP 50
Power Rating at +25 °C
Chassis Mounted Resistors
Unmounted Resistors
200 W
5 W
100 W
5 W
100 W
3.5 W
50 W
3.5 W
Thermal Resistance (per Resistor) 0.5 °C/W 1 °C/W 0.5 °C/W 1 °C/W
Limiting Voltage UL 1500 V 1500 V 500 V 500 V
Dielectric Strength (1)
Connections/Chassis
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.
Dielectric Strength (1)
Connections/Resistors - -
2500 V, 1 min
10 mA max.
2500 V, 1 min
10 mA max.
Ohmic Value Range 0.046 to 1 M0.091 to 1 M
Tolerance ± 1 % to ± 10 % ± 1 % to ± 10 %
Electrical Diagrams
R
R
Shunt version
R2
R1
RTOP
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Revision: 06-Apr-18 3Document Number: 50045
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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)
• 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:
P: Expressed in W
T: 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
T = 125 °C - 30 °C 95 °C
RTH (j - c) + RTH (c - h) + RTH (h - a) = = = 0.73 °C/W
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
Tightening Torque on Heatsink RTOP
2 Nm
PT
RTH (j - c) RTH (c - h) RTH (h - a)
++
-------------------------------------------------------------------------------------------=
T
P
-------
95
130
--------
RTOP
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Revision: 06-Apr-18 4Document Number: 50045
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
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.
ENERGY CURVE
POWER CURVE
MARKING
Series, style, ohmic value (in), tolerance (in %),
manufacturing date, Vishay Sfernice trademark.
POWER RATING
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.
0.01
0.1
1
10
100
1000
ENERGY IN JOULES
OVERLOAD DURATION IN s
RTOP
DRTOP
10-7 10-6 10-5 10-4 10-3 10-2 10-1 100
100
1000
10 000
100 000
1 000 000
10-7 10-6 10-5 10-4 10-3 10-2 10-1 100
POWER IN W
OVERLOAD DURATION IN s
RTOP
DRTOP
PACKAGING
Box of 10 units
0 20 40 60 80 100 120 140
0
20
40
60
80
100
RATED POWER IN %
HEATSINK TEMPERATURE IN °C
RTOP
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Revision: 06-Apr-18 5Document Number: 50045
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
ORDERING INFORMATION
RTOP 200 5U ± 1 % ± % V
DRTOP 50 150U 5 % 15U 5 % V XXX BO10 e
R1 T1 R2
MODEL STYLE OHMIC
VALUE
ABSOLUTE TOLERANCE PER
RESISTOR
CONNECTIONS CUSTOM
DESIGN
PACKAGING LEAD
(Pb)-FREE
RTOP
DRTOP
100
50
Optional
± 1 %
± 2 %
± 5 %
± 10 %
To be precise for
each resistor
V: screw
VS: RTOP shunt
Optional
GLOBAL PART NUMBER INFORMATION
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
4871 = 4870
1002 = 10 000
R010 = 0.01
R680 = 0.68
2710 = 2.7 k
F = 1 %
G = 2 %
J = 5 %
K = 10 %
B = box
10 pieces
As applicable
Ex = UA1
GLOBAL PART NUMBER INFORMATION
GLOBAL
MODEL SIZE LEADS VALUE No. 1 VALUE No. 2 TOLERANCE PACKAGING SPECIAL
DRTOP 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 k
470 = 47.0
222 = 2.20 k
The first two
digits are
significant
figures and the
last digit
specifies the
number of
zeros to follow.
R designates
decimal point.
103 = 10 k
470 = 47.0
222 = 2.20 k
F = 1 %
G = 2 %
J = 5 %
K = 10 %
B = box
10 pieces
As applicable
Ex = UA1
J BOP100V5 0
RTR0
J BOP 0 5 0 V1 3R T 0
D130
RTOP
www.vishay.com Vishay Sfernice
Revision: 06-Apr-18 6Document Number: 50045
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
GLOBAL PART NUMBER INFORMATION
MODEL SIZE LEADS
VALUE (two values are
identical and cannot be coded
in three digits) in four digits
TOLERANCE PACKAGING SPECIAL
DRTOP 050
100
V = screw 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 k
48R7 = 48.7
2241 = 2.24 k
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
J BOP 1 0 0V 1 1
RT02
D
Legal Disclaimer Notice
www.vishay.com Vishay
Revision: 08-Feb-17 1Document Number: 91000
Disclaimer
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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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Parameters provided in datasheets and / or specifications may vary in different applications and performance may vary over
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