PRODUCT SHEET
www.vishay.com
RESISTIVE PRODUCTS
RESISTORS
Models RTO 20 and RTO 50
Thick Film Power Resistor
FEATURES
• TO-220package:Compactandeasytomount
• 20-wattand50-wattpowerratingsavailablewiththrough-holeor
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
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
Fortechnicalquestions,contactsfer@vishay.com
Power Resistors, Thick Film Technology
Revision20-Sep-07
Revision05-Jun-07
Power Resistors Thick Film Technology
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50005
14 Revision: 05-Jun-07
RTO 20
Vishay Sfernice
The well known TO 220 package is compact and easy to
mount.
FEATURES
x20 W at 25 °C Heatsink Mounted
xHigh Power Dissipation to size ratio
xWide Resistance Range from 0.01 : to 1 M:
xNegligible Inductance
xEasy Mounting
xTO 220 package: Compact and easy to mount
Two versions of this thick film resistor are available:
xA Radial Leaded version for PCB Mounting
xA Flat Lead version for Surface Mounting
DIMENSIONS in millimeters
MECHANICAL SPECIFICATIONS
Mechanical Protection Insulated Case
Resistive Element Thick Film
Connections Tinned copper
Weight 2.2 g max.
DIMENSIONS
Standard Package TO 220
Insulated case
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 seperated
by 60 s
RoHS
COMPLIANT
A%74.9*6,.<64.::7;1.9>2:.:8.,2/2.-C55
RTO 20F - LEADED



B





B

RTO 20C - FOR SURFACE MOUNTING







B


2
A!64@/79 #%!=.9:276 -<926g :<9/*,.57<6;:74-.926g ;.58.9*;<9.897/24.
5<:;67;,*<:.;1.5.;*4;*+7/;12:-.=2,.;7.?,..-D
ELECTRICAL SPECIFICATIONS
Resistance Range 0.010 :to 1 M: serie E24
Tolerances (Standard) ± 1 % to ± 10 %
Dissipation and
::7,2*;.- 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
%.58.9*;<9.7.//2,2.6; See Performance table
Standard (- 55 °C; + 150 °C) ± 150 ppm/°C
Limiting Element Voltage 250 V
Dielectric Strength
MIL STD 202
2000 VRMS - 1 min - 10 mA Max
(Between Terminals and Heatsink)
Insulation Resistance t 106 M:
Inductance d 0.1 µH
Critical Resistance 3.12 k:
Document Number: 50035 For technical questions, contact: sfer@vishay.com www.vishay.com
Revision: 20-Sep-07 1
RTO 50
Vishay Sfernice
Power Resistor, Thick Film Technology
FEATURES
x50 W at 25 °C Heatsink Mounted
xAdjusted by sand trimming
xLeaded or surface mount versions
xHigh power to size ratio
xNon inductive element
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
MECHANICAL SPECIFICATIONS
Mechanical Protection Molded
Resistive Element Thick Film
Connections Tinned copper alloy
Weight 2.2 g max.
DIMENSIONS
Standard Package TO 220
Insulated Case
ENVIRONMENTAL SPECIFICATIONS
Temperature Range - 55 °C to + 155 °C
Climatic Category 55/155/156
Sealing Sealed container
Solder immersion
Flammability IEC 60695-11-5
2 applications 30 seconds
seperated by 60 seconds
RoHS
COMPLIANT
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.
4.5
1.3
8.8
Ø 0.8
10.1
13.7
12.5
5.08
15
Ø 3.6
2.5
RTO 50F - LEADED
4.5
1.3
8.8
10.1
12.5
5.08
15
Ø 3.6
0.3
1.6
3
2
RTO 50C - FOR SURFACE MOUNTING
ELECTRICAL SPECIFICATIONS
Resistance Range 0.010 : to 1 M: serie E24
Tolerances Standard ± 1 % to ± 10 %
Dissipation and Associated Onto a heatsink
Thermal Resistance
and Nominal Power
50 W at + 25 °C
RTH (j-c): 2.6 °C/W
free air:
2.25 W at + 25 °C
Temperature Coefficient See Performance table
Standard (- 55 °C; + 150 °C) ± 150 ppm/°C
Limiting Element Voltage 300 V
Dielectric Strength
MIL STD 202 (301)
2000 V
RMS
- 1 Minute
10 mA Max
Insulation Resistance t 106 M:
Inductance d0.1 µH
Critical Resistance 1.8 k:
RTO 20 and RTO 50
VishaySfernice
VMN-PT9056-0801
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