Datasheet

ManualsBrandsVishay ManualsPassive ComponentsPower resistor 50W 47Ohm1%

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Document Number: 50050

Revision 30-May-06

www.vishay.com

LTO 50

Vishay Sfernice

Power Resistor Thick Film Technology

FEATURES

• 50 Watt at 25 °C Case Temperature Heatsink

Mounted

• Direct mounting ceramic on heatsink

• Broad Resistance Range: R010 to 550K

• Non Inductive

• TO-220 package: Compact and easy to mount

• RoHS compliant

• Isolated case

• Tolerance unless otherwise speciﬁ ed: ± 0.3 mm

DIMENSIONS in millimeters

MECHANICAL SPECIFICATIONS

Mechanical Protection Molded

Resistive Element Thick Film

Substrate Alumina

Connections Tinned Copper

Weight 2 g max.

Mounting Torque 1 N-m

DIMENSIONS

Standard Package TO-220

Isolated case

ENVIRONMENTAL SPECIFICATIONS

Temperature Range - 55 °C to + 150 °C

Climatic Category 55/155/56

Resistance Range 0.010 Ω to 550 kΩ

Tolerances (Standard) ± 1 % to ± 10 %

Dissipation and Associated Onto a heatsink

Power Rating 50 W at + 25 °C (case temperature)

and Thermal Resistance R

TH (j-c): 2.5 °C/W

of the component free air:

2.5 W at + 25 °C

Temperature Coefﬁ cient See Performance table

Standard ± 150 ppm/°C

Limiting Element Voltage 250 V

Dielectric Strength

1500 V

RMS - 1 minute - 10 mA max.

MIL STD 202

Insulation Resistance ≥ 10

MΩ

Inductance ≤ 0.1 µH

Critical Resistance 1.25 kΩ

ELECTRICAL SPECIFICATIONS

3.2

16.2

10.4

1.8

5.08

0.6

3.5

1.3

0.8

12.7

Ø3.2

3.2

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.

RoHS

COMPLIANT

Summary of content (4 pages)

PAGE 1
LTO 50 Vishay Sfernice Power Resistor Thick Film Technology FEATURES • 50 Watt at 25 °C Case Temperature Heatsink Mounted RoHS COMPLIANT • Direct mounting ceramic on heatsink • Broad Resistance Range: R010 to 550K • Non Inductive • TO-220 package: Compact and easy to mount 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. • RoHS compliant • Isolated case DIMENSIONS in millimeters 3.2 10.
PAGE 2
LTO 50 Power Resistor Thick Film Technology Vishay Sfernice PERFORMANCE TESTS CONDITIONS TYPICAL DRIFTS EN60115-1 1.5 Pr/5 s Us < 1.5 UL ± (0.5 % + 0.005 Ω) Momentary Overload EN60115-1 IEC 60068-2-14 Tests Na 5 cycles - 55 °C to + 155 °C ± (0.5 % + 0.005 Ω) EN60115-1 1000 h Pr at + 25 °C ± (1 % + 0.005 Ω) MIL STD 202 Method 103 B Cond. D ± (0.5 % + 0.005 Ω) Vibration MIL STD 202 Method 204 Cond. D ± (0.2 % + 0.005 Ω) Terminal Strength MIL STD 202 Method 211 Cond. A1 ± (0.2 % + 0.
PAGE 3
LTO 50 Vishay Sfernice Power Resistor Thick Film Technology OVERLOADS In any case the applied voltage must be lower than the maximum overload voltage of 375V. The values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink. ENERGY IN JOULES ENERGY CURVE 10 1 0.1 0.01 10 -6 10 -5 10-4 10 -3 10 -2 OVERLOAD DURATION IN SECONDS POWER RATING CHART The temperature of the heatsink should be maintained within the limits specified.
PAGE 4
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