RTO 50
www.vishay.com
Vishay Sfernice
50 W Power Resistor, Thick Film Technology, TO-220
FEATURES
• 50 W at 25 °C heatsink mounted
• Adjusted by sand trimming
• Leaded or surface mount versions
• High power to size ratio
• Non inductive element
• Material categorization: for definitions of compliance
please see
www.vishay.com/doc?99912
DESIGN SUPPORT TOOLS
Models
Available
click logo to get started
Because of the knowledge and experience in Thick Film technology, Vishay Sfernice has been able to develop a high power
resistor in a TO-220 package called RTO 50. The special design of this component allows the dissipation of 50 W when mounted
on a heatsink. The ohmic value is adjusted by sand trimming. This process does not generate hot spots as in laser trimming,
which could lead to microcracks on each side of the curve. This process improves the reliability and the stability of the resistor
and at the same time gives a good overload capability.
DIMENSIONS
in millimeters
RTO 50F - LEADED
4.5
10.1
Ø 3.6
1.3
RTO 50C - FOR SURFACE MOUNTING
4.5
10.1
Ø 3.6
1.3
12.5
15
8.8
12.5
15
8.8
2
3
13.7
1.6
5.08
0.3
Ø 0.8
5.08
2.5
• Only for RTO 50 version C = during surface mount soldering, the
soldering temperature profile must not cause the metal tab of this
device to exceed 220 °C.
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
RTO 50
Note
(1)
E24 series
SIZE
TO-220
RESISTANCE RATED POWER
RANGE
P
25 °C
W
(1)
0.010 to 550K
50
LIMITING ELEMENT
VOLTAGE
U
L
V
500
TOLERANCE
±%
1, 2, 5, 10
TEMPERATURE
COEFFICIENT
± ppm/°C
150
CRITICAL
RESISTANCE
5K
MECHANICAL SPECIFICATIONS
Mechanical Protection
Resistive Element
Connections
Weight
Molded
Thick film
Tinned copper alloy
2.2 g max.
TECHNICAL SPECIFICATIONS
Dissipation and Associated
Thermal Resistance
and Nominal Power
Dielectric Strength
MIL STD 202 (301)
Insulation Resistance
Inductance
Onto a heatsink
50 W at +25 °C
R
TH (j - c)
: 2.6 °C/W
Free air: 2.25 W at +25 °C
2000 V
RMS
- 1 min
10 mA max.
10
6
M
0.1 μH
ENVIRONMENTAL SPECIFICATIONS
Temperature Range
Climatic Category
Sealing
Flammability
-55 °C to 155 °C
55 / 155 / 156
Sealed container, solder immersion
IEC 60695-11-5,
2 applications 30 s separated by 60 s
DIMENSIONS
Standard Package
TO-220 insulated case
Note
• Not compatible with RoHS reflow profile
Revision: 16-Nov-17
Document Number: 50035
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
RTO 50
www.vishay.com
Vishay Sfernice
PERFORMANCE
TESTS
Momentary Overload
CONDITIONS
EN 60115-1
2 Pr 5 s for R < 2
1.6 Pr 5 s for R
2
U
S
< 1.5
U
L
EN 60115-1
60 068-2-14
5 cycles -55 °C to +155 °C
EN 60115-1
Pr at +25 °C, 1000 h CEI 115_1
EN 60115-1
56 days RH 95 %
MIL STD 202
method 204 C test D
MIL STD 202
method 211 test A1
REQUIREMENTS
± (0.25 % + 0.05
)
Rapid Temperature Change
Load Life
Humidity (Steady State)
Vibration
Terminal Strength
± (0.5 % + 0.05
)
± (1 % + 0.05
)
± (0.5 % + 0.05
)
± (0.2 % + 0.05
)
± (0.2 % + 0.05
)
RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR
Resistance Values
Tolerances
Temperature Coefficient
(-55 °C to +155 °C)
Standard
± 900 ppm/°C
0.01
0.015
± 1 % at ± 10 %
± 700 ppm/°C
± 250 ppm/°C
± 150 ppm/°C
0.1
0.5
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 155 °C. The dissipated power is simply calculated by the following ratio:
1
T
P =
-------------------------------------------------------------------------------------------
R
TH (j - c)
+ R
TH (c - h)
+ R
TH (h - a)
P:
T:
R
TH (j - c)
:
R
TH (c - h)
:
R
TH (h - a)
:
Example:
Expressed in W
Difference between maximum working temperature and room temperature
Thermal resistance value measured between resistive layer and outer side of the resistor. It is
the thermal resistance of the component: (Special Features Table)
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
Thermal resistance of the heatsink
R
TH (c - a)
: For RTO 50 power rating 13 W at ambient temperature +30 °C
Thermal resistance R
TH (j - c)
: 2.6 °C/W
Considering equation
(1)
we have:
T
155 °C - 30 °C = 125 °C
-
R
TH (j - c)
+ R
TH (c - h)
+ R
TH (h - a)
=
------
=
-------
= 9.6 °C/W
-
T
P
125
13
R
TH (c - a)
+ R
TH (h - a)
9 .6 °C/W - 2.6 °C/W
7 °C/W
Revision: 16-Nov-17
Document Number: 50035
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
RTO 50
www.vishay.com
OVERLOADS
The applied voltage must always be lower than the
maximum overload voltage of 750 V.
The values indicated on the graph below are applicable to
resistors in air or mounted onto a heatsink.
Vishay Sfernice
POWER RATING
The temperature of the heatsink should be maintained within
the limits specified.
To improve the thermal conductivity, surfaces in contact
should be coated with a silicone grease and the torque
applied on the screw for tightening should be around 1 Nm.
MARKING
Model, style, resistance value (in
),
tolerance (in %),
manufacturing date, Vishay Sfernice trademark.
RATED POWER IN %
100
ENERGY CURVE
100
80
60
ENERGY IN JOULES
10
40
1
20
0.1
0
0
25
50
100
150
200
0.01
HEATSINK TEMPERATURE IN °C
0.001
10
-7
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
PACKAGING
Tube of 50 units
OVERLOAD DURATION IN s
POWER CURVE
100 000
POWER IN W
10 000
1000
100
10
-7
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
OVERLOAD DURATION IN s
Revision: 16-Nov-17
Document Number: 50035
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
RTO 50
www.vishay.com
Vishay Sfernice
100K
RESISTANCE VALUE
± 1%
TOLERANCE
± 1%
± 2%
± 5%
± 10%
XXX
CUSTOM DESIGN
optional
on request:
special TCR,
shape, etc.
TU50
PACKAGING
e1
LEAD (Pb)-FREE
ORDERING INFORMATION
RTO
MODEL
50
STYLE
F
CONNECTIONS
F: radial leads
C: surface mount
GLOBAL PART NUMBER INFORMATION
R
T
O
0
5
0
F
R
6
8
0
0
J
T
E
1
GLOBAL
MODEL
RTO
SIZE
050
LEADS
F
= radial leads
C
= surface mount
OHMIC VALUE
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
48701
= 48 700
10002
= 100 000
R0100
= 0.01
R6800
= 0.68
27000
= 2700
= 2.7 k
TOLERANCE
F
=1%
G
=2%
J
=5%
K
= 10 %
PACKAGING
T
= tube
Size 30 and 50:
tube 50 pieces
RELATED DOCUMENTS
APPLICATION NOTES
Potentiometers and Trimmers
Guidelines for Vishay Sfernice Resistive and Inductive Components
www.vishay.com/doc?51001
www.vishay.com/doc?52029
Revision: 16-Nov-17
Document Number: 50035
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
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
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 in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular
purpose, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of
typical requirements that are often placed on Vishay products in generic applications. Such statements are not binding
statements 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 to the warranty expressed therein.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk.
Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for
such applications.
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. Product names and markings noted herein may be trademarks of their respective owners.
© 2017 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED
Revision: 08-Feb-17
1
Document Number: 91000
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