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15

LTO 50

Vishay Sfernice

Document Number: 50050

Revision 26-Mar-07

TESTS

CONDITIONS

TYPICAL DRIFTS

Momentary Overload

EN60115-1

± (0.5 % + 0.005 Ω)

1.5 Pr/5 s

Us < 1.5 UL

EN60115-1

Rapid Temperature Change

IEC 60068-2-14 Tests Na

5 cycles

± (0.5 % + 0.005 Ω)

- 55 °C to + 155 °C

Load Life

EN60115-1

± (1 % + 0.005 Ω)

1000 h Pr at + 25 °C

Humidity (Steady State)

MIL STD 202

± (0.5 % + 0.005 Ω)

Method 103 B Cond. D

Vibration

MIL STD 202

± (0.2 % + 0.005 Ω)

Method 204 Cond. D

Terminal Strength

MIL STD 202

± (0.2 % + 0.005 Ω)

Method 211 Cond. A1

Shock

100G, MIL STD 202

± (0.5 % + 0.005 Ω)

Method 213 Cond. I

performance

Power Resistor Thick Film Technology

Resistance Values

≥ 0.010

≥ 0.015

≥ 0.1

≥ 0.5

Tolerances

± 1 % at ± 10 %

± 900 ppm/°C

± 700 ppm/°C

± 250 ppm/°C

± 150 ppm/°C

special features

Typical Temperature

Coefficient

(- 55 °C/+ 150 °C)

P:

expressed in W

∆T: difference between maximum working temperature and room temperature.

resistance of the component.

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

thermal compound.

Example:

Considering equation (1) we have:

∆T = 150 °C - 25 °C = 125 °C

=

= 12.5 °C/W

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 =

∆T

∆T

P

125

10

(1)