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
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
DESIGN SUPPORT TOOLS
Models
Available
click logo to get started
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
15 ± 0.3
30
38
12.6
25
Ø 4.2
Note
• Tolerances unless otherwise specified: ± 0.3 mm
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
DRTOP50
RTOP100
DRTOP100
RTOP200
SIZE
RESISTANCE RANGE
0.091 to 1M
SOT-227B
0.046 to 1M
0.046 to 1M
RATED POWER
P
25 °C
W
50
100
200
TOLERANCE
±%
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
TEMPERATURE
COEFFICIENT
± ppm/°C
150, 300
150, 300
150, 300
MECHANICAL SPECIFICATIONS
Mechanical Protection
Resistive Element
Substrate
End Connections
Tightening Torque Connections
Tightening Torque Heatsink
Weight
Revision: 16-Nov-17
Insulated case
Cermet
Alumina on insulated base
V connections: screw M4 x 6
1 Nm
2 Nm
30 g max.
ENVIRONMENTAL SPECIFICATIONS
Temperature Range
Climatic Category
-55 °C to +125 °C
55 / 125 / 56
TECHNICAL SPECIFICATIONS
Temperature Coefficient
(-55 °C to +125 °C)
Insulation Resistance
Standard
± 300 ppm/°C (R < 1)
± 150 ppm/°C (R > 1)
> 10
6
M
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
Momentary Overload
CONDITIONS
IEC 60115-1
2.5 Pr/5 s
U
S
< 2 U
L
IEC 60115-1
5 cycles, -55 °C, +125 °C
IEC 60115-1
Pr at 25 °C, 1000 h
IEC 60115-1 / IEC 60068-2-3 Test Ca
56 days, 95 % RH / 40 °C
REQUIREMENTS
< ± (0.25 % + 0.05
)
< ± (0.25 % + 0.05
)
< ± (0.5 % + 0.05
)
< ± (0.5 % + 0.05
)
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 U
L
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 min
10 mA max.
-
0.046
to 1 M
± 1 % to ± 10 %
100 W
5W
1 °C/W
1500 V
2500 V, 1 min
10 mA max.
-
100 W
3.5 W
0.5 °C/W
500 V
2500 V, 1 min
10 mA max.
2500 V, 1 min
10 mA max.
50 W
3.5 W
1 °C/W
500 V
2500 V, 1 min
10 mA max.
2500 V, 1 min
10 mA max.
0.091
to 1 M
± 1 % to ± 10 %
R
R2
R1
Electrical Diagrams
R
Shunt version
Note
(1)
MIL-STD-202 Method 301
Revision: 16-Nov-17
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
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)
Tightening Torque on Heatsink
RTOP
2 Nm
Vishay Sfernice
• 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:
T
P =
-------------------------------------------------------------------------------------------
R
TH (j - c)
+ R
TH (c - h)
+ R
TH (h - a)
P:
T:
Expressed in W
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 - 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
R
TH (h - a)
: Thermal resistance of the heatsink
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
T
= 125 °C - 30 °C
95 °C
R
TH (j - c)
= 0.112 °C/W
R
TH (c - h)
+ R
TH (h - a)
= 0.73 °C/W - 0.5 °C/W
0.23 °C/W
T
P
95
130
R
TH (j - c)
+ R
TH (c - h)
+ R
TH (h - a)
=
------
=
-------
= 0.73 °C/W
-
-
Revision: 16-Nov-17
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
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.
Vishay Sfernice
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.
100
ENERGY CURVE
1000
ENERGY IN JOULES
100
RTOP
RATED POWER IN %
80
60
10
DRTOP
40
1
20
0.1
0
0
0.01
10
-7
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
10
0
20
40
60
80
100
120
140
HEATSINK TEMPERATURE IN °C
OVERLOAD DURATION IN s
PACKAGING
POWER CURVE
1 000 000
Box of 10 units
100 000
POWER IN W
10 000
RTOP
DRTOP
1000
100
10
-7
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
10
0
OVERLOAD DURATION IN s
MARKING
Series, style, ohmic value (in), tolerance
manufacturing date, Vishay Sfernice trademark.
(in
%),
Revision: 16-Nov-17
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
±1%
±%
V
ORDERING INFORMATION
RTOP
200
5U
DRTOP
50
150U
5%
15U
R1
T1
5%
R2
V
XXX
BO10
e
MODEL
RTOP
DRTOP
STYLE
100
50
OHMIC
VALUE
ABSOLUTE TOLERANCE PER
RESISTOR
Optional
±1%
±2%
±5%
± 10 %
To be precise for
each resistor
CONNECTIONS
V: screw
VS: RTOP shunt
CUSTOM
DESIGN
Optional
PACKAGING
LEAD
(Pb)-FREE
GLOBAL PART NUMBER INFORMATION
R
T
O
P
1
0
0
V
5
R
0
0
J
B
MODEL
RTOP
SIZE
100
200
LEADS
V
= screw
VS
= RTOP shunt
OHMIC VALUE
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
TOLERANCE
F
=1%
G
=2%
J
=5%
K
= 10 %
PACKAGING
B
= box
10 pieces
SPECIAL
As applicable
Ex
= UA1
GLOBAL PART NUMBER INFORMATION
D
R
T
O
P
0
5
0
V
1
0
3
1
0
3
J
B
GLOBAL
MODEL
DRTOP
SIZE
050
100
LEADS
V
= screw
VALUE No. 1
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
47R
= 47.0
222
= 2.20 k
VALUE No. 2
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
47R
= 47.0
222
= 2.20 k
TOLERANCE
F
=1%
G
=2%
J
=5%
K
= 10 %
PACKAGING
B
= box
10 pieces
SPECIAL
As applicable
Ex
= UA1
Revision: 16-Nov-17
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
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