LTO 100
www.vishay.com
Vishay Sfernice
Revision: 16-Nov-17
1
Document Number: 50051
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
Power Resistor Thick Film Technology
DESIGN SUPPORT TOOLS
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
• 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.
Note
• Tolerances unless stated: ± 0.3 mm
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Available
Models
DIMENSIONS in millimeters
STANDARD ELECTRICAL SPECIFICATIONS
MODEL SIZE
RESISTANCE
RANGE
RATED POWER
P
25 °C
W
LIMITING ELEMENT
VOLTAGE U
L
V
TOLERANCE
± %
TEMPERATURE
COEFFICIENT
± ppm/°C
CRITICAL
RESISTANCE
LTO 100 TO-247 0.015 to 1 M 100 500 1, 2, 5, 10 200, 350, 900 2.5 K
5.0
20.7
15.76
2.4
10.16
0.6
3.5
3.6
1.5
14.5
Ø 3.6
5.33
MECHANICAL SPECIFICATIONS
Mechanical Protection Molded
Resistive Element Thick film
Substrate Alumina
Connections Tinned copper
Weight 3.5 g max.
Mounting Torqure 1 Nm
ENVIRONMENTAL SPECIFICATIONS
Temperature Range -55 °C to +175 °C
Climatic Category 55 / 175 / 56
Flammability
IEC 60695-11-5
2 applications 30 s
separated by 60 s
TECHNICAL SPECIFICATIONS
Dissipation and Associated Onto a heatsink
Power Rating and
Thermal Resistance
of the Component
100 W at +25 °C (case temp.)
R
TH (j - c)
: 1.5 °C/W
Free air:
3.5 W at +25 °C
Temperature Coefficient
See Performance table
± 150 ppm/°C
Dielectric Strength
MIL STD 202
3000 V
RMS
- 1 min
10 mA max.
Insulation Resistance 10
4
M
Inductance 0.1 μH
LTO 100
www.vishay.com
Vishay Sfernice
Revision: 16-Nov-17
2
Document Number: 50051
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
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:
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
R
TH (j - c)
+ R
TH (c - h)
+ R
TH (h - a)
= = = 15 °C/W
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.
PERFORMANCE
TESTS CONDITIONS REQUIREMENTS
Momentary Overload
EN 60115-1
1.5 Pr/5 s
U
S
< 1.5 U
L
± (0.5 % + 0.005 )
Load Life
EN 60115-1
1000 h Pr at +25 °C
± (1 % + 0.005 )
High Temperature Exposure
AEC-Q200 REV D conditions:
MIL-STD-202 method 108
1000 h, +175 °C, unpowered
± (0.25 % + 0.005 )
Temperature Cycling
AEC-Q200 REV D conditions:
JESD22 method JA-104
1000 cycles, -55 °C to +125 °C
dwell time -15 min
± (1 % + 0.005 )
Biased Humidity
AEC-Q200 REV D conditions:
MIL-STD-202 method 103
1000 h, 85 °C, 85 % RH
± (1 % +0.005 )
Operational Life
AEC-Q200 REV D conditions:
MIL-STD-202 method 108
2000 h, 90/30, powered, +125 °C
± (1 % +0.005 )
ESD Human Body Model
AEC-Q200 REV D conditions:
AEC-Q200-002
25 kV
AD
± (0.5 % +0.005 )
Vibration
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
± (0.5 % +0.005 )
Mechanical Shock
AEC-Q200 REV D conditions:
MIL-STD-202 method 213
100 g’s, 6 ms, 3.75 m/s
3 shocks/direction
± (0.5 % +0.005 )
Terminal Strength
AEC-Q200 REV D conditions:
AEC-Q200-006
2 kgf, 60 sec
± (0.25 % +0.01 )
SPECIAL FEATURES
Resistance Values 0.015 0.1 > 20
Tolerances ± 1 % at ± 10 %
Typical Temperature Coefficient
(-55 ° to +175 °C)
± 900 ppm/°C ± 350 ppm/°C ± 200 ppm/°C
P =
T
R
TH (j - c)
R
TH (c - h)
R
TH (h - a)
++
-----------------------------------------------------------------------------------
1
T
P
-------
150
10
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