RTO 20
www.vishay.com
Vishay Sfernice
20 W Power Resistor, Thick Film Technology, TO-220
FEATURES
• 20 W at 25 °C heatsink mounted
• High power dissipation to size ratio
• Wide resistance range from 0.01
to 550 k
• Negligible inductance
• Easy mounting
• TO-220 package: compact and easy to mount
• Material categorization: for definitions of compliance
please see
www.vishay.com/doc?99912
Two versions of this thick film resistor are available:
Models
Available
DESIGN SUPPORT TOOLS
click logo to get started
• A radial leaded version for PCB mounting
• A flat lead version for surface mounting
The well known TO-220 package is compact and easy to
mount.
DIMENSIONS
in millimeters
RTO 20F - LEADED
4.5
RTO 20C - FOR SURFACE MOUNTING
4.5
1.3
10.1
Ø 3.6
1.3
10.1
Ø 3.6
12.5
15
8.8
12.5
15
8.8
2
13.7
1.6
3
0.3
5.08
• Only for RTO 20 version C = during surface mount soldering temperature profile
must not cause the metal tab of this device to exceed 220 °C.
Ø 0.8
5.08
2.5
Note
• Tolerances unless stated: ± 0.4 mm
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
RTO 20
Note
(1)
E24 series
SIZE
TO-220
RESISTANCE RATED POWER
RANGE
P
25 °C
W
(1)
0.010 to 550K
20
LIMITING ELEMENT
VOLTAGE
U
L
V
500
TOLERANCE
±%
1, 2, 5, 10
TEMPERATURE
COEFFICIENT
± ppm/°C
150
CRITICAL
RESISTANCE
12.5K
MECHANICAL SPECIFICATIONS
Mechanical Protection
Resistive Element
Substrate
Connections
Weight
Insulated case
Thick film
Alumina onto base of nickel coated
copper
Tinned copper
2.2 g max.
TECHNICAL SPECIFICATIONS
Dissipation and
Associated
Thermal Resistance
and Nominal Power
Dielectric Strength
MIL STD 202
Insulation Resistance
Inductance
Onto a heatsink
20 W at + 25 °C
R
TH (j - c)
: 6.5 °C/W
Free air:
2 W at +25 °C
2000 V
RMS
- 1 min - 10 mA max.
(between terminals and heatsink)
10
6
M
0.1 μH
ENVIRONMENTAL SPECIFICATIONS
Temperature Range
Climatic Category
Sealing
Flammability
-55 °C to 155 °C
55 / 155 / 56
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: 50005
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 20
www.vishay.com
Vishay Sfernice
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 60115-1/60068-2-14
5 cycles
-55 °C to +155 °C
EN 60115-1
1000 h Pr at +25 °C
EN 60115-1
56 days RH 95 %
NF EN 140 000
1000 h - 40 % Pr at +100 °C
MIL STD 202, Method 204 C Test D
MIL STD 202, Method 211 Test A1
IEC 60115-1
IEC 60068-2-27
Saw tooth: 100
g/6
ms
REQUIREMENTS
± (0.25 % + 0.005
)
PERFORMANCE
TESTS
Momentary Overload
Rapid Temperature Change
Load Life
Humidity (Steady State)
High Temperature Exposure
Vibration
Terminal Strength
Shock
± (0.5 % + 0.005
)
± (1 % + 0.005
)
± (0.5 % + 0.005
)
± (0.5 % + 0.005
)
± (0.2 % + 0.005
)
± (0.2 % + 0.005
)
± (0.5 % + 0.005
)
RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR
Resistance Values
Tolerances
Typical Temperature
Coefficient Range
(-55 °C to +155 °C)
± 900 ppm/°C
0.01
0.015
± 1 % at ± 10 %
± 700 ppm/°C
± 250 ppm/°C
± 150 ppm/°C
0.1
0.5
Note
• For very low ohmic values, TCR for information
CHOICE OF THE HEATSINK
The user must choose the board 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:
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: Special Features table.
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 RTO 20 power rating 10 W at ambient temperature +25 °C
Thermal resistance R
TH (j - c)
: 6.5 °C/W
Considering equation
(1)
we have:
T
= 155 °C - 25 °C = 130 °C
T
P
130
10
R
TH (j - c)
+ R
TH (c - h)
+ R
TH (h - a)
=
------
=
-------
= 13 °C/W
-
-
R
TH (c - h)
+ R
TH (h - a)
= 13 °C/W - 6.5 °C/W = 6.5 °C/W
Revision: 16-Nov-17
Document Number: 50005
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 20
www.vishay.com
OVERLOADS
In any case the applied voltage must 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.
Spring clip can also be used to mount the component on an
heatsink (ex: Kunze, clip KU4-498).
120
MARKING
Model, style, resistance value (in
),
tolerance (in %),
manufacturing date, Vishay Sfernice trademark.
ENERGY CURVE
100
RATED POWER IN %
100
ENERGY IN JOULES
10
75
1
50
0.1
25
0.01
0
0
20
40
60
80
100
120
140 155
HEATSINK TEMPERATURE IN °C
0.001
10
-7
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
OVERLOAD DURATION IN s
PACKAGING
POWER CURVE
100 000
Tube of 50 units
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: 50005
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 20
www.vishay.com
Vishay Sfernice
U68
RESISTANCE VALUE
5%
TOLERANCE
±1%
±2%
±5%
± 10 %
xxx
CUSTOM DESIGN
Optional
on request:
special TCR,
shape etc.
TU50
PACKAGING
e3
LEAD (Pb)-FREE
ORDERING INFORMATION
RTO
MODEL
20
STYLE
F
CONNECTIONS
F:
radial leads
C:
surface mount
GLOBAL PART NUMBER INFORMATION
R
T
O
0
2
0
F
R
6
8
0
0
J
T
E
3
GLOBAL
MODEL
RTO
STYLE
020
DIELECTRIC
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
Revision: 16-Nov-17
Document Number: 50005
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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