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 Ω to 1 MΩ
• Non inductive
• TO-247 package: compact and easy to mount
• AEC-Q200 qualified
LINKS TO ADDITIONAL RESOURCES
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
3D 3D
3D Models
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
Ø 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
MODEL
SIZE
RESISTANCE
RANGE
Ω
LTO 100
TO-247
0.015 to < 0.2
100
500
LTO 100
TO-247
0.2 to 1M
100
500
TEMPERATURE
COEFFICIENT
± ppm/°C
CRITICAL
RESISTANCE
Ω
5, 10
350, 900
n/a
1, 2, 5, 10
200, 350
2.5 K
RATED POWER LIMITING ELEMENT
TOLERANCE
P25 °C
VOLTAGE UL
±%
W
V
MECHANICAL SPECIFICATIONS
ENVIRONMENTAL SPECIFICATIONS
Mechanical Protection
Temperature Range
Resistive Element
Substrate
Connections
Weight
Mounting Torque
Revision: 08-Dec-2021
Molded
Thick film
Climatic Category
Alumina
Tinned copper
Flammability
-55 °C to +175 °C
55 / 175 / 56
IEC 60695-11-5
Application time: ta = 10 s
Burning duration: tb < 30 s
3.5 g max.
1 Nm
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
TECHNICAL SPECIFICATIONS
Dissipation and Associated
Onto a heatsink
100 W at +25 °C (case temp.)
RTH (j - c): 1.5 °C/W
Free air:
3.5 W at +25 °C
Power Rating and Thermal Resistance of the Component
See Performance table
± 150 ppm/°C
Temperature Coefficient
Dielectric Strength
MIL STD 202
3000 VRMS - 1 min
10 mA max.
Insulation Resistance
≥ 104 MΩ
Inductance
≤ 0.1 μH
PERFORMANCE
TESTS
CONDITIONS
REQUIREMENTS
EN 60115-1
1.5 Pr/5 s
US < 1.5 UL
± (0.5 % + 0.005 Ω)
EN 60115-1
1000 h Pr at +25 °C
± (0.5 % + 0.005 Ω)
AEC-Q200 rev. D conditions:
MIL-STD-202 method 108
1000 h, +175 °C, unpowered
± (0.25 % + 0.005 Ω)
AEC-Q200 rev. D conditions:
JESD22 method JA-104
1000 cycles, -55 °C to +125 °C
dwell time -15 min
± (0.5 % + 0.005 Ω)
Biased Humidity
AEC-Q200 rev. D conditions:
MIL-STD-202 method 103
1000 h, 85 °C, 85 % RH
± (1 % + 0.005 Ω)
Operational Life
AEC-Q200 rev. D conditions:
MIL-STD-202 method 108
2000 h, 90/30, powered, +125 °C
± (0.5 % + 0.005 Ω)
ESD Human Body Model
AEC-Q200 rev. D conditions:
AEC-Q200-002
25 kVAD
± (0.5 % + 0.005 Ω)
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
± (0.2 % + 0.005 Ω)
Mechanical Shock
AEC-Q200 rev. D conditions:
MIL-STD-202 method 213
100 g’s, 6 ms, 3.75 m/s
3 shocks/direction
± (0.2 % + 0.005 Ω)
Terminal Strength
AEC-Q200 rev. D conditions:
AEC-Q200-006
2 kgf, 60 s
± (0.25 % + 0.01 Ω)
Momentary Overload
Load Life
High Temperature Exposure
Temperature Cycling
SPECIAL FEATURES
Resistance Values
≥ 0.015
Tolerances
Typical Temperature Coefficient
(-55 °C to +155 °C)
Revision: 08-Dec-2021
≥ 0.1
5 %, 10 %
± 900 ppm/°C
≥ 0.2
≥ 20
1 %, 2 %, 5 %, 10 %
± 350 ppm/°C
± 350 ppm/°C
± 200 ppm/°C
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
Vishay Sfernice
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)
ΔT
P = ----------------------------------------------------------------------------------[ R TH (j - c) ] + [ R TH (c - h) ] + [ R TH (h - a) ]
P:
Expressed in W
ΔT:
Difference between maximum working temperature and room temperature
RTH (j - c):
Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal resistance of the
component.
RTH (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.
RTH (h - a): Thermal resistance of the heatsink.
Example:
RTH (c - h) + RTH (h - a) for LTO 100 power rating 10 W at ambient temperature +25 °C
Thermal resistance RTH (j - c): 1.5 °C/W
Considering equation (1) we have:
ΔT = 175 °C - 25 °C = 150 °C
150
ΔT
RTH (j - c) + RTH (c - h) + RTH (h - a) = ------- = ----------- = 15 °C/W
10
P
RTH (c - h) + RTH (h - a) = 15 °C/W - 1.5 °C/W = 13.5 °C/W
with a thermal grease RTH (c - h) = 1 °C/W, we need a heatsink with RTH (h - a) = 12.5 °C/W.
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.
Axis Title
10000
125
1000
75
1st line
2nd line
2nd line
Rated Power (%)
100
50
100
25
10
0
0
20
40
60
80
100
120
140
160
175180
Case Temperature (°C)
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.
Revision: 08-Dec-2021
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
ENERGY CURVE
Axis Title
100
10000
10
1st line
2nd line
2nd line
Energy (J)
1000
1
100
0.1
0.01
0.0000001
10
0.000001
0.00001
0.0001
0.001
0.01
0.1
1
Overloard Duration (s)
POWER CURVE
Axis Title
1 000 000
10000
100 000
1st line
2nd line
x
Power (W)
1000
10 000
100
1000
100
0.0000001
10
0.000001
0.00001
0.0001
0.001
0.01
0.1
1
Overload Duration (s)
IMPEDANCE CURVE 10 Ω to 1 kΩ from 100 kHz to 300 MHz
Axis Title
10000
4.30
10 Ω
3.80
1000
2.80
1st line
2nd line
2nd line
|Z|/R
3.30
2.30
25 Ω
1.80
100
50 Ω, 75 Ω, 100 Ω
270 Ω
500 Ω
1000 Ω
1.30
1.00
0.80
0.30
100 kHz
1 MHz
10 MHz
100 MHz
300 MHz
10
1000 MHz
Frequency (Hz)
Revision: 08-Dec-2021
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
LTO 100
www.vishay.com
Vishay Sfernice
MARKING
PACKAGING
Model, style, resistance value (in Ω), tolerance (in %),
manufacturing date, Vishay Sfernice trademark.
Tube of 30 units
ORDERING INFORMATION
LTO
100
F
2.7 kΩ
±1%
xxx
TU30
e3
MODEL
STYLE
CONNECTIONS
RESISTANCE VALUE
TOLERANCE
CUSTOM DESIGN
PACKAGING
LEAD (Pb)-FREE
±1%
±2%
±5%
± 10 %
Optional
on request:
special TCR,
shape etc.
GLOBAL PART NUMBER INFORMATION
L
T
O
1
0
0
F
2
7
0
0
0
J
T
E
3
GLOBAL
MODEL
SIZE
LEADS
OHMIC VALUE
TOLERANCE
PACKAGING
LEAD (Pb)-FREE
LTO
100
F = radial leads
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 Ω
48701 = 48 700 Ω
10002 = 100 000 Ω
R0100 = 0.01 Ω
R4700 = 0.47 Ω
27000 = 2700 Ω = 2.7 kΩ
F=1%
G=2%
J=5%
K = 10 %
T = tube
E3 = pure tin
Revision: 08-Dec-2021
Tube 30 pieces
Document Number: 50051
5
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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Revision: 01-Jan-2022
1
Document Number: 91000