reSIStIVe ProductS
RESISTORS
Mo dels rto 20 a nd rto 50
Product Sheet
Thick Film Power Resistor
FEATURES
• TO-220 package: Compact and easy to mount
• 0-watt and 50-watt power ratings available with through-hole or
2
SMD versions
• Broad resistance range: 0.01 Ω to 1 MΩ
• Low thermal resistance down to 2.6 °C/W
• Non-inductive element
APPLICATIONS
• Industrial and medical power supplies
• Test equipment
• Power conversion
• Current sensing
• Snubbers
w w w. v i s h a y. c o m
Datasheet is available on our web site at www.vishay.com
for RTO 20 and RTO 50 - http://www.vishay.com/doc?50005 and
http://www.vishay.com/doc?50035
RTO 20
RTO 50
RTO 20 and RTO 50
Vishay Sfernice
Vishay Sfernice
Vishay Sfernice
Power Resistors Thick Film Technology
Power Resistors,
FEATURES
FEATURES
Thick Film Technology
Power Resistor, Thick Film Technology
50 W at 25 °C Heatsink Mounted
Adjusted by sand trimming
Leaded or surface mount versions
High power to size ratio
Non inductive element
RoHS
COMPLIANT
20 W at 25 °C Heatsink Mounted
High Power Dissipation to size ratio
Wide Resistance Range from 0.01 to 1 M
Negligible Inductance
Easy Mounting
TO 220 package: 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
RoHS
COMPLIANT
The well known TO 220 package is compact and easy to
mount.
DIMENSIONS
in millimeters
RTO 20C - FOR SURFACE MOUNTING
RTO 20F - LEADED
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
RTO 50C - FOR SURFACE MOUNTING
4.5
10.1
Ø 3.6
1.3
10.1
Ø 3.6
1.3
2
12.5
15
8.8
12.5
15
8.8
2
13.7
1.6
3
0.3
g
g
5.08
Ø 0.8
2.5
5.08
MECHANICAL SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
Resistance Range
0.010
± 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
Standard
(- 55 °C; + 150 °C)
± 150 ppm/°C
250 V
2000 V
RMS
- 1 min - 10 mA Max
(Between Terminals and Heatsink)
10
6
M
0.1 µH
3.12 k
Limiting Element Voltage
Dielectric Strength
MIL STD 202
Insulation Resistance
Inductance
Critical Resistance
to 1 M
serie E24
Tolerances (Standard)
Dissipation and
Mechanical Protection
Insulated Case
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.
Resistive Element
Thick Film
MECHANICAL SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
Resistance Range
Tolerances Standard
Dissipation and Associated
0.010
to 1 M
serie E24
± 1 % to ± 10 %
Onto a heatsink
Connections
Weight
Thermal Resistance
and Nominal Power
Tinned copper
2.2 g max.
DIMENSIONS
Mechanical Protection
Resistive Element
Connections
Weight
Molded
Thick Film
Tinned copper alloy
2.2 g max.
Standard Package
TO 220
Insulated case
DIMENSIONS
Standard Package
TO 220
Insulated Case
Thermal Resistance
and Nominal Power
Temperature Coefficient
ENVIRONMENTAL SPECIFICATIONS
50 W at + 25 °C
R
TH
(j-c): 2.6 °C/W
free air:
2.25 W at + 25 °C
Temperature Range
- 55 °C to + 155 °C
Climatic Category
55/155/56
ENVIRONMENTAL SPECIFICATIONS
Temperature Range
Climatic Category
Sealing
Flammability
See Performance table
Standard (- 55 °C; + 150 °C)
Limiting Element Voltage
Dielectric Strength
MIL STD 202 (301)
Insulation Resistance
Inductance
Critical Resistance
± 150 ppm/°C
300 V
2000 V
RMS
- 1 Minute
10 mA Max
10
6
M
0.1 µH
1.8 k
Sealing
Sealed container
Solder immersion
Flammability
IEC 60695-11-5
2 applications 30 s seperated
by 60 s
- 55 °C to + 155 °C
55/155/156
Sealed container
Solder immersion
IEC 60695-11-5
2 applications 30 seconds
seperated by 60 seconds
Revision 05-Jun-07
NOTICE
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc., or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information
contained herein is intended to provide a product description only. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay’s terms and
conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness for a particular
purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling
these products for use in such applications do so at their own risk and agree to fully indemnify Vishay for any damages resulting from such improper use or sale.
For technical questions, contact sfer@vishay.com
Revision 20-Sep-07
www.vishay.com
14
For technical questions, contact: sfer@vishay.com
Document Number: 50005
Revision: 05-Jun-07
Document Number: 50035
Revision: 20-Sep-07
For technical questions, contact: sfer@vishay.com
www.vishay.com
1
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