LTO030FR3000JTE3 - Vishay Presicion Group

www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50049

74 Revision: 21-Jan-11

LTO 30

Vishay Sfernice

30 W Power Resistor Thick Film Technology

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.

FEATURE

30 W at 25 °C case temperature heatsink

mounted

Direct mounting ceramic on heatsink

Broad resistance range: 0.010  to 550 k

Non inductive

TO-220 package: Compact and easy to mount

Compliant to RoHS directive 2002/95/EC

Note

• Tolerances unless stated: ± 0.3 mm

MECHANICAL SPECIFICATIONS

Mechanical Protection Molded

Resistive Element Thick film

Substrate Alumina

Connections Tinned copper

Weight 2 g max.

Mounting Torqure 1 Nm

DIMENSIONS

Standard Package TO220 package

ENVIRONMENTAL SPECIFICATIONS

Temperature Range - 55 °C to + 155 °C

Climatic Category 55/155/56

Flammability IEC 60695-11-5

2 applications 30 s

separated by 60 s

DIMENSIONS in millimeters

3.2

16.2

10.4

1.8

5.08

0.6

3.5

1.3

0.8 12.7

3.2

Ø 3.2

ELECTRICAL SPECIFICATIONS

Resistance Range 0.010  to 550 k

Tolerances (Standard) ± 1 % to ± 10 %

Dissipation and Associated Onto a heatsink

Power Rating and

Thermal Resistance

of the Component

30 W at + 25 °C (case temp.)

RTH (j - c): 4.2 °C/W

Free air:

2.25 W at + 25 °C

Temperature Coefficient See Performance table

Standard ± 150 ppm/°C

Limiting Element Voltage UL250 V

Dielectric Strength

MIL STD 202

1500 VRMS - 1 min

10 mA max.

Insulation Resistance  104 M

Inductance 0.1 µH

Critical Resistance 2.08 k

Document Number: 50049 For technical questions, contact: sfer@vishay.com www.vishay.com

Revision: 21-Jan-11 75

LTO 30

30 W Power Resistor Thick Film Technology 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 150 °C. The dissipated power is simply calculated by the following ratio:

P: Expressed in W

T: 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 - 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:

RTH (c - a) for LTO 30 power rating 10 W at ambient temperature + 25 °C

Thermal resistance RTH (j - c): 4.2 °C/W

Considering equation (1) we have:

T = 150 °C - 25 °C = 125 °C

RTH (j - c) + RTH (c - a) = = = 12.5 °C/W

RTH (c - a) = 12.5 °C/W - 4.2 °C/W = 8.3 °C/W

with a thermal grease RTH (c - h) = 1 °C/W, we need a heatsink with RTH (h - a) = 7.3 °C/W.

PERFORMANCE

TESTS CONDITIONS REQUIREMENTS

Momentary Overload

EN 60115-1

1.5 Pr/5 s

US < 1.5 UL

± (0.5 % + 0.005 )

Rapid Temperature Change

EN 60115-1

IEC 60068-2-14 Test Na

5 cycles

- 55 °C to + 155 °C

± (0.5 % + 0.005 )

Load Life EN 60115-1

1000 h Pr at + 25 °C ± (1 % + 0.005 )

Humidity (Steady State) MIL-STD-202

Method 103 B Cond. D ± (0.5 % + 0.005 )

Vibration MIL-STD-202

Method 204 Cond. D ± (0.2 % + 0.005 )

Terminal Strength MIL-STD-202

Method 211 Cond. A1 ± (0.2 % + 0.005 )

Shock 100G, MIL-STD-202

Method 213 Cond. I ± (0.5 % + 0.005 )

SPECIAL FEATURES

Resistance Values  0.010  0.015  0.1  0.5

Tolerances ± 1 % at ± 10 %

Typical Temperature Coefficient

(- 55 ° to + 155 °C) ± 900 ppm/°C ± 700 ppm/°C ± 250 ppm/°C ± 150 ppm/°C

P = T

RTH (j - c) + RTH (c - a)



----------------------------------------------------------- 1

T

-------

125

----------

www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50049

76 Revision: 21-Jan-11

LTO 30

Vishay Sfernice 30 W Power Resistor Thick Film Technology

OVERLOADS

In any case the applied voltage must be lower than the

maximum overload voltage of 375 V.

The values indicated on the graph below are applicable to

resistors in air or mounted onto a heatsink.

MARKING

Model, style, resistance value (in ), tolerance (in %),

manufacturing date, Vishay Sfernice trademark.

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.

10-6

ENERGY IN J

OVERLOAD DURATION IN s

ENERGY CURVE

100

0.1

0.01 10-5 10-4 10-3 10-2

PACKAGING

Tube of 50 units

0 20 40 60 80 100 120 140 150

100

125

RATED POWER IN %

CASE TEMPERATURE IN °C

ORDERING INFORMATION

LTO 30 F 2.7 k± 1 %xxx TU50 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

GLOBAL

MODEL SIZE LEADS OHMIC VALUE TOLERANCE PACKAGING LEAD (Pb)-FREE

LTO 030 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 

48701 = 48 700 

10002 = 100 000 

R0100 = 0.01 

R4700 = 0.47

27000 = 2700  = 2.7 k

F = 1 %

G = 2 %

J = 5 %

K = 10 %

T = Tube

Tube 50 pieces

E3 = Pure tin

030F270 0 T 3T OL 0JE

Document Number: 91000 www.vishay.com

Revision: 11-Mar-11 1

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