C&H Technology LTO100 User Manual

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Suite 108
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Power Resistor Thick Film Technology

FEATURE

• 100 W at 25 °C case temperature heatsink
mounted

• Direct mounting ceramic on heatsink

• Broad resistance range: R015 to 1M

• Non inductive

• TO-247 package: Compact and easy to mount

LTO 100

Vishay Sfernice

RoHS

COMPLIANT

LTO series are the extension of RTO types. We used the

• RoHS compliant

direct ceramic mounting design (no metal tab) of our RCH
power resistors applied to semiconductor packages.

DIMENSIONS in millimeters

15.76

5.33

Ø 3.6

3.6

1.5

10.16

3.5

MECHANICAL SPECIFICATIONS

Mechanical Protection Molded
Resistive Element Thick film
Substrate Alumina
Connections Tinned copper
Weight 3.5 g max.
Mounting Torqure 1 Nm

DIMENSIONS

Standard Package TO-247 isolated case

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

Document Number: 50051 For technical questions, contact: [e-mail]
Revision: 16-Oct-08 1

5.0

20.7

14.5

0.6

2.4

ELECTRICAL SPECIFICATIONS

Resistance Range 0.015 Ω to 1 MΩ

Tolerances (Standard) ± 1 % to ± 10 %

Dissipation and Associated Onto a heatsink

Power Rating and
Thermal Resistance
of the Component

Temperature Coefficient See Performance table

Standard ± 150 ppm/°C

Limiting Element Voltage U

Dielectric Strength
MIL STD 202

Insulation Resistance ≥ 10

Inductance ≤

Critical Resistance 1.41 kΩ

100 W at + 25 °C (case temp.)

R

(j - c): 1.5 °C/W

TH

Free air:

3.5 W at + 25 °C

L

375 V

1500 V

10 mA max.

RMS

- 1 min

4

MΩ

0.1 µH

www.vishay.com

LTO 100

Vishay Sfernice

Power Resistor Thick Film Technology

PERFORMANCE

TESTS CONDITIONS REQUIREMENTS

Momentary Overload

Rapid Temperature Change

Load Life

Humidity (Steady State)

Vibration

Terminal Strength

Shock

EN 60115-1

1.5 Pr/5 s
< 1.5 U

U

S

EN 60115-1

IEC 60068-2-14 Tests Na

5 cycles

- 55 °C to + 175 °C

EN 60115-1

1000 h Pr at + 25 °C

MIL STD 202

Method 103 B Cond. D

MIL STD 202

Method 204 Cond. D

MIL STD 202

Method 211 Cond. A1

100G, MIL STD 202
Method 213 Cond. I

L

± (0.5 % + 0.005 Ω)

± (0.5 % + 0.005 Ω)

± (1 % + 0.005 Ω)

± (0.5 % + 0.005 Ω)

± (0.2 % + 0.005 Ω)

± (0.2 % + 0.005 Ω)

± (0.5 % + 0.005 Ω)

SPECIAL FEATURES

Resistance Values ≥ 0.010 ≥ 0.015 ≥ 0.1 ≥ 0.5

Tolerances ± 1 % at ± 10 %

Typical Temperature Coefficient
(- 55 ° to + 175 °C)

± 900 ppm/°C ± 700 ppm/°C ± 250 ppm/°C ± 150 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:

------------------------------------------------------------ ----------

P

=

R

TH

ΔT

jc–()R

TH

P: Expressed in W
ΔT: Difference between maximum working temperature and room temperature
R

(j - c): Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal

TH

resistance of the component.

RTH (c - a): Thermal resistance value measured between outer side of the resistor and room temperature. It is the thermal

resistance of the heatsink itself (type, shape) and the quality of the fastening device, and the thermal resistance
of the thermal compound.

Example:

R

(c - a) for LTO 100 power rating 10 W at ambient temperature + 25 °C

TH

Thermal resistance R

(j - c): 1.5 °C/W

TH

Considering equation (1) we have:

ΔT = 175 °C - 25 °C = 150 °C

ΔT

150

-------

(j - c) + RTH (c - a) = = = 15 °C/W

R

TH

(c - a) = 15 °C/W - 1.5 °C/W = 13.5 °C/W

R

TH

with a thermal grease R

(c - h) = 1 °C/W, we need a heatsink with RTH (h - a) = 12.5 °C/W.

TH

----------

P

10

1()

ca–()+[]

www.vishay.com For technical questions, contact: [e-mail] Document Number: 50051
2 Revision: 16-Oct-08

LTO 100

Power Resistor Thick Film Technology

OVERLOADS

In any case the applied voltage must be lower than the
maximum overload voltage of 560 V.
The values indicated on the graph below are applicable to
resistors in air or mounted onto a heatsink.

ENER GY CURVE

10

1

ENERGY IN JOULES

0.1

0.01
10

-6

-5

10

OVERLOAD DURATION IN s

10

-4

10

-3

10

-2

Vishay Sfernice

POWER RATING CHART

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.

100

75

50

% RATED POWER

25

0

0 20 40 60 80 100 120 140 160 175

HEATSINK TEMPERATURE IN °C

MARKING

Model, style, resistance value (in Ω), tolerance (in %),
manufacturing date, VISHAY trademark.

PACKAGI N G

Tube of 30 units

ORDERING INFORMATION

LTO 100 F 2.7 kΩ ± 1 % xxx TU30 e3

MODEL STYLE CONNECTIONS RESISTANCE VALUE TOLERANCE

± 1 %
± 2 %
± 5 %

± 10 %

CUSTOM DESIGN

Optional

on request:

Special TCR,

shape etc.

PACKAGING LEAD (Pb)-FREE

GLOBAL PART NUMBER INFORMATION

100F270 0 T 3T OL 0JE

GLOBAL

MODEL

LTO 100 F = Radial leads The firts four digits are

SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING

T = Tube

Tube 30 pieces

significant figures and the
last digit specifies the
number of zeros to follow.

F = 1 %

G = 2 %

J = 5 %

K = 10 %

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 = 2K7 Ω

LEAD (Pb)-FREE

E3 = Pure tin

Document Number: 50051 For technical questions, contact: [e-mail]

www.vishay.com

Revision: 16-Oct-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
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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