RTO 20
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
Ω
to 550 kΩ
Negligible inductance
Easy mounting
TO-220 package: Compact and easy to mount
Compliant to RoHS directive 2002/95/EC
The well known TO-220 package is compact and easy to
mount.
Two versions of this thick film resistor are available:
•
A radial leaded version for PCB mounting
•
A flat lead version for surface mounting
DIMENSIONS
in millimeter
s
RTO 20F - LEADED
4.5
RTO 20C - FOR SURFACE MOUNTING
10.1
4.5
Ø 3.6
1.3
10.1
Ø 3.6
1.3
12.5
15
8.8
12.5
15
8.8
13.7
3
1.6
2
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
• Tolerance unless otherwise specified: ± 0.4 mm
MECHANICAL SPECIFICATIONS
Mechanical Protection
Resistive Element
Connections
Weight
Insulated case
Thick film
Tinned copper
2.2 g max.
ELECTRICAL SPECIFICATIONS
Resistance Range
Tolerances (Standard)
Dissipation and Associated:
Thermal Resistance
and Nominal Power
Temperature Coefficient
Standard
(- 55 °C; + 150 °C)
Limiting Element Voltage U
L
Dielectric Strength
MIL STD 202
Insulation Resistance
Inductance
Critical Resistance
0.010
Ω
to 550 kΩ serie E24
± 1 % to ± 10 %
Onto a heatsink
20 W at + 25 °C
R
TH (j - c)
: 6.5 °C/W
free air:
2 W at + 25 °C
See Performance table
± 150 ppm/°C
250 V
2000 V
RMS
- 1 min - 10 mA max.
(between terminals
and heatsink)
≥
10
6
MΩ
≤
0.1 µH
3.12 kΩ
DIMENSIONS
Standard Package
TO-220
Insulated case
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 seperated
by 60 s
Note
• Not compatible with RoHS reflow profile
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34
For technical questions, contact:
sfer@vishay.com
Document Number: 50005
Revision: 18-May-09
RTO 20
20 W Power Resistor, Thick Film Technology, TO-220
Vishay Sfernice
PERFORMANCE
TESTS
CONDITIONS
EN 60115-1
2
P
r
5 s for R < 2
Ω
1.6
P
r
5 s for R
≥
2
Ω
U
S
< 1.5
U
L
EN 60115-1/60068-2-14
5 cycles
- 55 °C to + 155 °C
EN 60115-1
1000 h
P
r
at + 25 °C
EN 60115-1
56 days R.H. 95 %
NF EN 140 000
1000 h - 40 %
P
r
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
Ω)
Momentary Overload
Rapid Temperature Change
± (0.5 % + 0.005
Ω)
± (1 % + 0.005
Ω)
± (0.5 % + 0.005
Ω)
± (0.5 % + 0.005
Ω)
± (0.2 % + 0.005
Ω)
± (0.2 % + 0.005
Ω)
± (0.5 % + 0.005
Ω)
Load Life
Humidity (Steady State)
High Temperature Exposure
Vibration
Terminal Strength
Shock
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 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
)
ΔT
-
P = ----------------------------------------------------------
[
R
TH (j - c)
+ R
TH (c - a)
]
P:
ΔT:
R
TH (j - c)
:
R
TH (c - 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 room temperature. It is the thermal
resistance of the heatsink itself (type, shape) and the quality of the fastening device.
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:
ΔT
=
155 °C - 25 °C
=
130 °C
ΔT
130
-
R
TH (j - c)
+ R
TH (c - a)
= ------- = --------- = 13 °C/W
P
10
R
TH (c - a)
= 13 °C/W - 6.5 °C/W = 6.5 °C/W
Document Number: 50005
Revision: 18-May-09
For technical questions, contact:
sfer@vishay.com
www.vishay.com
35
RTO 20
Vishay Sfernice
20 W Power Resistor, Thick Film Technology, TO-220
OVERLOADS
In any case the applied voltage must be lower than the
maximum overload voltage of 375 V.
The values indicated on the graph below are applicable to
resistors in air or mounted onto a heatsink.
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
ENERGY CURVE
100
10
RATED POWER IN %
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
100
ENERGY IN J
75
1
50
0.1
25
0.01
10
-7
0
0
20
40
60
80
100
120
140 155
OVERLOAD DURATION IN s
HEATSINK TEMPERATURE IN °C
MARKING
Model, style, resistance value (in
Ω),
tolerance (in %),
manufacturing date, Vishay Sfernice trademark.
PACKAGING
Tube of 50 units
ORDERING INFORMATION
RTO
MODEL
20
STYLE
F
CONNECTIONS
F: Radial leads
C: Surface mount
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
GLOBAL PART NUMBER INFORMATION
R
T
O
0
2
0
F
R
6
8
0
0
J
T
E
3
GLOBAL
MODEL
RTO
SIZE
020
LEADS
F
= Radial leads
C
= Surface mount
OHMIC VALUE
The firts four digits are
significant figures and the last
digit specifies the number of
zeros to follow.
R designates decimal point.
48R70
= 48.7
Ω
48701
= 48 700
Ω
10002
= 100 000
Ω
R0100
= 0.01
Ω
R6800
= 0.68
Ω
27000
= 2700
Ω
= 2.7 kΩ
TOLERANCE
F
=1%
G
=2%
J
=5%
K
= 10 %
PACKAGING
T
= Tube
Size 30 and 50:
Tube 50 pieces
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36
For technical questions, contact:
sfer@vishay.com
Document Number: 50005
Revision: 18-May-09
Legal Disclaimer Notice
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 and agree
to fully indemnify and hold Vishay and its distributors harmless from and against any and all claims, liabilities, expenses and
damages arising or resulting in connection with such use or sale, including attorneys fees, even if such claim alleges that Vishay
or its distributor was negligent regarding the design or manufacture of the part. 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.
Document Number: 91000
Revision: 11-Mar-11
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