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 click logo to get started Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
Models
Available
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
5.0
15.76
5.33
20.7
3.6
3.6 3.5
14.5
1.5
0.6
2.4
10.16
Note
Tolerances unless stated: 0.3 mm
STANDARD ELECTRICAL SPECIFICATIONS
RESISTANCE RATED POWER LIMITING ELEMENT TEMPERATURE CRITICAL
TOLERANCE
MODEL SIZE RANGE P VOLTAGE U COEFFICIENT RESISTANCE
25 C L
%
W V ppm/C
LTO 100 TO-247 0.015 to 1 M 100 500 1, 2, 5, 10 200, 350, 900 2.5 K
MECHANICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS
Mechanical Protection Molded Dissipation and Associated Onto a heatsink
Resistive Element Thick film 100 W at +25 C (case temp.)
Power Rating and
R : 1.5 C/W
TH (j - c)
Substrate Alumina
Thermal Resistance
Free air:
of the Component
Connections Tinned copper
3.5 W at +25 C
Weight 3.5 g max.
See Performance table
Temperature Coefficient
150 ppm/C
Mounting Torqure 1 Nm
Dielectric Strength 3000 V - 1 min
RMS
MIL STD 202 10 mA max.
ENVIRONMENTAL SPECIFICATIONS
4
Temperature Range -55 C to +175 C Insulation Resistance 10 M
Inductance 0.1 H
Climatic Category 55 / 175 / 56
IEC 60695-11-5
Flammability 2 applications 30 s
separated by 60 s
Revision: 16-Nov-17 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
PERFORMANCE
TESTS CONDITIONS REQUIREMENTS
EN 60115-1
Momentary Overload 1.5 Pr/5 s (0.5 % + 0.005 )
U < 1.5 U
S L
EN 60115-1
Load Life (1 % + 0.005 )
1000 h Pr at +25 C
AEC-Q200 REV D conditions:
MIL-STD-202 method 108
High Temperature Exposure (0.25 % + 0.005 )
1000 h, +175 C, unpowered
AEC-Q200 REV D conditions:
JESD22 method JA-104
Temperature Cycling (1 % + 0.005 )
1000 cycles, -55 C to +125 C
dwell time -15 min
AEC-Q200 REV D conditions:
Biased Humidity MIL-STD-202 method 103 (1 % +0.005 )
1000 h, 85 C, 85 % RH
AEC-Q200 REV D conditions:
Operational Life MIL-STD-202 method 108 (1 % +0.005 )
2000 h, 90/30, powered, +125 C
AEC-Q200 REV D conditions:
ESD Human Body Model AEC-Q200-002 (0.5 % +0.005 )
25 kV
AD
AEC-Q200 REV D conditions:
MIL-STD-202 method 204
Vibration (0.5 % +0.005 )
5 gs for 20 min, 12 cycles
test from 10 Hz to 2000 Hz
AEC-Q200 REV D conditions:
MIL-STD-202 method 213
Mechanical Shock (0.5 % +0.005 )
100 gs, 6 ms, 3.75 m/s
3 shocks/direction
AEC-Q200 REV D conditions:
Terminal Strength AEC-Q200-006 (0.25 % +0.01 )
2 kgf, 60 sec
SPECIAL FEATURES
Resistance Values 0.015 0.1 > 20
Tolerances 1 % at 10 %
Typical Temperature Coefficient
900 ppm/C 350 ppm/C 200 ppm/C
(-55 to +175 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 ++R R
TH (j - c) TH (c - h) TH (h - a)
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 resistance of the
TH (j - c)
component.
R : Thermal resistance value measured between outer side of the resistor and upper side of the heatsink. This is the thermal resistance
TH (c - h)
of the interface (grease, thermal pad), and the quality of the fastening device.
R : Thermal resistance of the heatsink.
TH (h - a)
Example:
R + R for LTO 100 power rating 10 W at ambient temperature +25 C
TH (c - h) TH (h - a)
Thermal resistance R : 1.5 C/W
TH (j - c)
(1)
Considering equation we have:
T = 175 C - 25 C = 150 C
T 150
R + R + R = ------- = ----------- = 15 C/W
TH (j - c) TH (c - h) TH (h - a)
P 10
R + R = 15 C/W - 1.5 C/W = 13.5 C/W
TH (c - h) TH (h - a)
with a thermal grease R = 1 C/W, we need a heatsink with R = 12.5 C/W.
TH (c - h) TH (h - a)
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