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RTO 50
Vishay Sfernice
Power Resistor, Thick Film Technology
FEATURE
• 50 W at 25 °C heatsink mounted
• Adjusted by sand trimming
• Leaded or surface mount versions
• High power to size ratio
• Non 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
RoHS
COMPLIANT
RTO 50F - LEADED
10.1
5.08
12.5
Ø 0.8
Ø 3.6
15
13.7
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 s
seperated by 60 s
Document Number: 50035 For technical questions, contact: sfer@vishay.com
Revision: 24-Nov-08 1
1.3
2.5
4.5
8.8
RTO 50C - FOR SURFACE MOUNTING
10.1
Ø 3.6
15
12.5
1.6
5.08
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
2
3
0.3
ELECTRICAL SPECIFICATIONS
Resistance Range 0.010 Ω to 550 kΩ serie E24
Tolerances Standard ± 1 % to ± 10 %
Dissipation and Associated Onto a heatsink
50 W at + 25 °C
Thermal Resistance
and Nominal Power
Temperature Coefficient
Standard (- 55 °C; + 150 °C)
Limiting Element Voltage U
Dielectric Strength
MIL STD 202 (301)
Insulation Resistance ≥ 10
Inductance ≤
Critical Resistance 1.8 kΩ
L
R
: 2.6 °C/W
TH (j - c)
free air:
2.25 W at + 25 °C
See Performance table
± 150 ppm/°C
300 V
2000 V
- 1 Min
RMS
10 mA max.
6
MΩ
0.1 µH
www.vishay.com
RTO 50
Vishay Sfernice
Power Resistor, Thick Film Technology
PERFORMANCE
TESTS CONDITIONS REQUIREMENTS
EN 60115-1
Momentary Overload
Rapid Temperature Change
Load Life
Humidity (Steady State)
Vibration
Terminal Strength
2 Pr 5 s for R < 2 Ω
1.6 Pr 5 s for R ≥ 2 Ω
U
< 1.5 U
S
EN 60115-1
60 068-2-14
5 cycles - 55 °C to + 155 °C
EN 60115-1
Pr at + 25 °C, 1000 h CEI 115_1
EN 60115-1
56 days RH 95 %
MIL STD 202
Method 204 C Test D
MIL STD 202
Method 211 Test A1
L
± (0.25 % + 0.05 Ω)
± (0.5 % + 0.05 Ω)
± (1 % + 0.05 Ω)
± (0.5 % + 0.05 Ω)
± (0.2 % + 0.05 Ω)
± (0.2 % + 0.05 Ω)
SPECIAL FEATURES
Resistance Values
Tolerances
Temperature
Coefficient
(- 55 °C to + 155 °C)
Standard ± 900 ppm/°C ± 700 ppm/°C ± 250 ppm/°C ± 150 ppm/°C
≥ 0.01 Ω ≥ 0.015 Ω ≥ 0.1 Ω ≥ 0.5 Ω
± 1 % at ± 10 %
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:
----------------------------------------------------------
P
R
P: Expressed in W
T: Difference between maximum working temperature and room temperature
R
: Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal
TH (j - c)
resistance of the component: (Special Features Table)
R
: Thermal resistance value measured between outer side of the resistor and room temperature. It is the
TH (c - a)
thermal resistance of the heatsink itself (type, shape) and the quality of the fastening device
Example:
R
Thermal resistance R
: For RTO 50 power rating 13 W at ambient temperature + 30 °C
TH (c - a)
: 26 °C/W
TH (j - c)
Considering equation (1) we have:
ΔT ≤ 155 °C - 30 °C ≤ 125 °C
ΔT
125
-------
R
TH (j - c)
R
TH (c - a)
+ R
= = = 9.6 °C/W
TH (c - a)
≤ 9 .6 °C/W - 2.6 °C/W ≤ 7 °C/W
----------
P
13
ΔT
+[]
TH (j - c)RTH (c - a)
1()=
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50035
2 Revision: 24-Nov-08
RTO 50
Power Resistor, Thick Film Technology
OVERLOADS
The applied voltage must always be lower than the maximum
overload voltage of 450 V.
The values indicated on the graph below are applicable to
resistors in air or mounted onto a heatsink.
ENERGY CURVE
10
1
ENERGY IN JOULES
0.1
0.01
-6
10
MARKING
Model, Style, Resistance Value (in Ω), Tolerance (in %),
Manufacturing Date, VISHAY trademark.
-5
10
OVERLOAD DURATION IN S
-4
10
-3 -2
10
10
Vishay Sfernice
POWER RATING CHART
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.
100
75
50
% RATED POWER
25
0
0 25 40 60 80 100 120 140 155
HEATSINK TEMPERATURE IN °C
PACKAGI N G
Tube of 50 units
ORDERING INFORMATION
RTO 50 F 100K ± 1% XXX TU50 e1
MODEL STYLE CONNECTIONS
F: Radial leads
C: Surface mount
RESISTANCE VALUE TOLERANCE
± 1%
± 2%
± 5%
± 10%
CUSTOM DESIGN
Optional
on request:
special TCR,
shap, etc.
PACKAGING LEAD (Pb)-free
GLOBAL PART NUMBER INFORMATION
050FR68 0T1T OR 0JE
GLOBAL
MODEL
RTO 050 F = Radial leads
SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING
C = Surface mount
The firts four digits are
significant figures and the last
digit specifies the number of
zeros to follow.
F = 1 %
G = 2 %
J = 5 %
K = 10 %
T = Tube
Size 30 and 50:
Tube 50 pieces
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 = 2K7 Ω
Document Number: 50035 For technical questions, contact: sfer@vishay.com
www.vishay.com
Revision: 24-Nov-08 3
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice.
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 herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
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.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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