RTO 20
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Revision: 16-Nov-17 1Document Number: 50005
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20 W Power Resistor, Thick Film Technology, TO-220
DESIGN SUPPORT TOOLS
The well known TO-220 package is compact and easy to
mount.
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:
• A radial leaded version for PCB mounting
• A flat lead version for surface mounting
Note
• Tolerances unless stated: ± 0.4 mm
Note
(1) E24 series
Note
• Not compatible with RoHS reflow profile
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Available
Models
DIMENSIONS in millimeters
STANDARD ELECTRICAL SPECIFICATIONS
MODEL SIZE
RESISTANCE
RANGE
RATED POWER
P25 °C
W
LIMITING ELEMENT
VOLTAGE UL
V
TOLERANCE
± %
TEMPERATURE
COEFFICIENT
± ppm/°C
CRITICAL
RESISTANCE
RTO 20 TO-220 0.010 to 550K (1) 20 500 1, 2, 5, 10 150 12.5K
RTO 20F - LEADED
4.5
1.3
8.8
Ø 0.8
10.1
13.7
12.5
5.08
15
Ø 3.6
2.5
RTO 20C - FOR SURFACE MOUNTING
4.5
1.3
8.8
10.1
12.5
5.08
15
Ø 3.6
0.3
1.6
3
2
• 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.
MECHANICAL SPECIFICATIONS
Mechanical Protection Insulated case
Resistive Element Thick film
Substrate Alumina onto base of nickel coated
copper
Connections Tinned copper
Weight 2.2 g max.
ENVIRONMENTAL SPECIFICATIONS
Temperature Range -55 °C to 155 °C
Climatic Category 55 / 155 / 56
Sealing Sealed container, solder immersion
Flammability
IEC 60695-11-5
2 applications 30 s
separated by 60 s
TECHNICAL SPECIFICATIONS
Dissipation and
Associated Onto a heatsink
Thermal Resistance
and Nominal Power
20 W at + 25 °C
RTH (j - c): 6.5 °C/W
Free air:
2 W at +25 °C
Dielectric Strength
MIL STD 202
2000 VRMS - 1 min - 10 mA max.
(between terminals and heatsink)
Insulation Resistance 106 M
Inductance 0.1 μH
DIMENSIONS
Standard Package TO-220 insulated case
RTO 20
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Revision: 16-Nov-17 2Document Number: 50005
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
• 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:
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: Special Features table.
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 RTO 20 power rating 10 W at ambient temperature +25 °C
Thermal resistance RTH (j - c): 6.5 °C/W
Considering equation (1) we have:
T = 155 °C - 25 °C = 130 °C
RTH (j - c) + RTH (c - h) + RTH (h - a) = = = 13 °C/W
RTH (c - h) + RTH (h - a) = 13 °C/W - 6.5 °C/W = 6.5 °C/W
PERFORMANCE
TESTS CONDITIONS REQUIREMENTS
Momentary Overload
EN 60115-1
2 Pr 5 s for R < 2
1.6 Pr 5 s for R 2
US < 1.5 UL
± (0.25 % + 0.005 )
Rapid Temperature Change
EN 60115-1/60068-2-14
5 cycles
-55 °C to +155 °C
± (0.5 % + 0.005 )
Load Life EN 60115-1
1000 h Pr at +25 °C ± (1 % + 0.005 )
Humidity (Steady State) EN 60115-1
56 days RH 95 % ± (0.5 % + 0.005 )
High Temperature Exposure NF EN 140 000
1000 h - 40 % Pr at +100 °C ± (0.5 % + 0.005 )
Vibration MIL STD 202, Method 204 C Test D ± (0.2 % + 0.005 )
Terminal Strength MIL STD 202, Method 211 Test A1 ± (0.2 % + 0.005 )
Shock
IEC 60115-1
IEC 60068-2-27
Saw tooth: 100 g/6 ms
± (0.5 % + 0.005 )
RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR
Resistance Values 0.01 0.015 0.1 0.5
Tolerances ± 1 % at ± 10 %
Typical Temperature
Coefficient Range
(-55 °C to +155 °C)
± 900 ppm/°C ± 700 ppm/°C ± 250 ppm/°C ± 150 ppm/°C
PT
RTH (j - c) RTH (c - h) RTH (h - a)
++
-------------------------------------------------------------------------------------------
1
=
T
P
-------
130
10
--------
RTO 20
www.vishay.com Vishay Sfernice
Revision: 16-Nov-17 3Document Number: 50005
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
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.
MARKING
Model, style, resistance value (in ), tolerance (in %),
manufacturing date, Vishay Sfernice trademark.
ENERGY CURVE
POWER CURVE
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).
0.001
0.01
0.1
1
10
100
ENERGY IN JOULES
OVERLOAD DURATION IN s
10-7 10-6 10-5 10-4 10-3 10-2 10-1
100
1000
10 000
100 000
POWER IN W
OVERLOAD DURATION IN s
10-7 10-6 10-5 10-4 10-3 10-2 10-1
PACKAGING
Tube of 50 units
RTO 20
www.vishay.com Vishay Sfernice
Revision: 16-Nov-17 4Document Number: 50005
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
RTO 20 F U68 5 % xxx TU50 e3
MODEL STYLE CONNECTIONS
F: radial leads
C: surface mount
RESISTANCE VALUE TOLERANCE
± 1 %
± 2 %
± 5 %
± 10 %
CUSTOM DESIGN
Optional
on request:
special TCR,
shape etc.
PACKAGING LEAD (Pb)-FREE
GLOBAL PART NUMBER INFORMATION
GLOBAL
MODEL STYLE DIELECTRIC OHMIC VALUE TOLERANCE PACKAGING
RTO 020 F = radial leads
C = surface mount
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
F = 1 %
G = 2 %
J = 5 %
K = 10 %
T = tube
Size 30 and 50:
Tube 50 pieces
020FR680T3T OR 0JE
Legal Disclaimer Notice
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Revision: 08-Feb-17 1Document Number: 91000
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