LTO 100
www.vishay.com
Vishay Sfernice
Power Resistor Thick Film Technology
FEATURES
• 100 W at 25 °C case temperature heatsink
mounted
• Direct mounting ceramic on heatsink
• Broad resistance range: 0.015
to 1 M
• Non inductive
• TO-247 package: compact and easy to mount
•
AEC-Q200 qualified
DESIGN SUPPORT TOOLS
Models
Available
click logo to get started
• Material categorization: for definitions of compliance
please see
www.vishay.com/doc?99912
LTO series are the extension of RTO types. We used the direct ceramic mounting design (no metal tab) of our RCH power
resistors applied to semiconductor packages.
DIMENSIONS
in millimeters
15.76
5.0
5.33
Ø 3.6
20.7
3.6
3.5
14.5
1.5
0.6
10.16
2.4
Note
• Tolerances unless stated: ± 0.3 mm
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
LTO 100
SIZE
TO-247
RESISTANCE
RANGE
0.015 to 1 M
RATED POWER LIMITING ELEMENT
TOLERANCE
P
25 °C
VOLTAGE U
L
±%
W
V
100
500
1, 2, 5, 10
TEMPERATURE
COEFFICIENT
± ppm/°C
200, 350, 900
CRITICAL
RESISTANCE
2.5 K
MECHANICAL SPECIFICATIONS
Mechanical Protection
Resistive Element
Substrate
Connections
Weight
Mounting Torqure
Molded
Thick film
Alumina
Tinned copper
3.5 g max.
1 Nm
TECHNICAL SPECIFICATIONS
Dissipation and Associated
Power Rating and
Thermal Resistance
of the Component
Temperature Coefficient
Dielectric Strength
MIL STD 202
Insulation Resistance
Inductance
Onto a heatsink
100 W at +25 °C (case temp.)
R
TH (j - c)
: 1.5 °C/W
Free air:
3.5 W at +25 °C
See Performance table
± 150 ppm/°C
3000 V
RMS
- 1 min
10 mA max.
10
4
M
0.1 μH
ENVIRONMENTAL SPECIFICATIONS
Temperature Range
Climatic Category
Flammability
Revision: 16-Nov-17
-55 °C to +175 °C
55 / 175 / 56
IEC 60695-11-5
2 applications 30 s
separated by 60 s
Document Number: 50051
1
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
LTO 100
www.vishay.com
Vishay Sfernice
CONDITIONS
EN 60115-1
1.5 Pr/5 s
U
S
< 1.5
U
L
EN 60115-1
1000 h Pr at +25 °C
AEC-Q200 REV D conditions:
MIL-STD-202 method 108
1000 h, +175 °C, unpowered
AEC-Q200 REV D conditions:
JESD22 method JA-104
1000 cycles, -55 °C to +125 °C
dwell time -15 min
AEC-Q200 REV D conditions:
MIL-STD-202 method 103
1000 h, 85 °C, 85 % RH
AEC-Q200 REV D conditions:
MIL-STD-202 method 108
2000 h, 90/30, powered, +125 °C
AEC-Q200 REV D conditions:
AEC-Q200-002
25 kV
AD
AEC-Q200 REV D conditions:
MIL-STD-202 method 204
5
g’s
for 20 min, 12 cycles
test from 10 Hz to 2000 Hz
AEC-Q200 REV D conditions:
MIL-STD-202 method 213
100
g’s,
6 ms, 3.75 m/s
3 shocks/direction
AEC-Q200 REV D conditions:
AEC-Q200-006
2 kgf, 60 sec
REQUIREMENTS
± (0.5 % + 0.005
)
± (1 % + 0.005
)
± (0.25 % + 0.005
)
PERFORMANCE
TESTS
Momentary Overload
Load Life
High Temperature Exposure
Temperature Cycling
± (1 % + 0.005
)
Biased Humidity
± (1 % +0.005
)
± (1 % +0.005
)
± (0.5 % +0.005
)
Operational Life
ESD Human Body Model
Vibration
± (0.5 % +0.005
)
Mechanical Shock
± (0.5 % +0.005
)
Terminal Strength
± (0.25 % +0.01
)
SPECIAL FEATURES
Resistance Values
Tolerances
Typical Temperature Coefficient
(-55 ° to +175 °C)
0.015
± 900 ppm/°C
0.1
± 1 % at ± 10 %
± 350 ppm/°C
> 20
± 200 ppm/°C
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 175 °C. The dissipated power is simply calculated by the following ratio:
1
T
P = -----
------------
-------------
------------
-------------
-------------
------------ -
--
R
TH (j - c)
+
R
TH (c - h)
+
R
TH (h - a)
P:
Expressed in W
T:
Difference between maximum working temperature and room temperature
R
TH (j - c)
: Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal resistance of the
component.
R
TH (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.
R
TH (h - a)
: Thermal resistance of the heatsink.
Example:
R
TH (c - h)
+ R
TH (h - a)
for LTO 100 power rating 10 W at ambient temperature +25 °C
Thermal resistance R
TH (j - c)
: 1.5 °C/W
Considering equation
(1)
we have:
T
= 175 °C - 25 °C = 150 °C
150
T
R
TH (j - c)
+ R
TH (c - h)
+ R
TH (h - a)
=
------
=
----------
= 15 °C/W
-
-
10
P
R
TH (c - h)
+ R
TH (h - a)
= 15 °C/W - 1.5 °C/W = 13.5 °C/W
with a thermal grease R
TH (c - h)
= 1 °C/W, we need a heatsink with R
TH (h - a)
= 12.5 °C/W.
Revision: 16-Nov-17
Document Number: 50051
2
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
LTO 100
www.vishay.com
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.
Vishay Sfernice
POWER RATING
The temperature of the case 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.
125
ENERGY CURVE
100
ENERGY IN JOULES
RATED POWER IN %
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
10
0
10
100
75
1
50
0.1
25
0.01
10
-7
0
0
20
40
60
80
100
120
140
160 175
OVERLOAD DURATION IN s
CASE TEMPERATURE IN °C
POWER CURVE
1 000 000
PACKAGING
100 000
Tube of 30 units
POWER IN W
MARKING
10 000
Model, style, resistance value (in
),
tolerance (in %),
manufacturing date, Vishay Sfernice trademark.
1000
100
10
-7
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
10
0
OVERLOAD DURATION IN s
Revision: 16-Nov-17
Document Number: 50051
3
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
LTO 100
www.vishay.com
Vishay Sfernice
2.7 k
RESISTANCE VALUE
±1%
TOLERANCE
±1%
±2%
±5%
± 10 %
xxx
CUSTOM DESIGN
Optional
on request:
special TCR,
shape etc.
TU30
PACKAGING
e3
LEAD (Pb)-FREE
ORDERING INFORMATION
LTO
MODEL
100
STYLE
F
CONNECTIONS
GLOBAL PART NUMBER INFORMATION
L
T
O
1
0
0
F
2
7
0
0
0
J
T
E
3
GLOBAL
MODEL
LTO
SIZE
100
LEADS
F
= radial leads
OHMIC VALUE
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
R4700
= 0.47
27000
= 2700
= 2.7 k
TOLERANCE
F
=1%
G
=2%
J
=5%
K
= 10 %
PACKAGING
T
= tube
Tube 30 pieces
LEAD (Pb)-FREE
E3
= pure tin
Revision: 16-Nov-17
Document Number: 50051
4
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
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
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RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
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“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
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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,
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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
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including but not limited to the warranty expressed therein.
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© 2017 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED
Revision: 08-Feb-17
1
Document Number: 91000
