General Note

IRC reserves the right to make changes in product specification without notice or liability.

All information is subject to IRC’s own data and is considered accurate at time of going to print.

A subsidiary of

TT electronics plc

Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com

LRF3W Series Issue July 2008

Low Range 3 Watt

SMT Chip Resistor

Electrical Data

LRF3W Series

Environmental Data

Environmental Test

Test Method

Performance (Resistance Change)

Thermal Shock

MIL-STD-202 Method 107

Condition F, -65°C to +150°C

±0.25% (+0.001Ω)

Short-time Overload

5 Seconds, 2 X Rated Power

Maximum 25 Amps

±0.5% (+0.0005Ω)

High Temperature Exposure

MIL-PRF-55342

100 Hours, 150°C, No Power

±0.5% (+0.0005Ω)

Load Life

1000 Hours, 70°C, Rated Power

±1.0% (+0.0005Ω)

Moisture Resistance

MIL-STD-202 Method 106

No Bias

±0.5% (+0.0005Ω)

Low Temperature Operation

MIL-PRF-55342

±0.25% (+0.0005Ω)

Resistance To Solder Heat

MIL-STD-202 Method 210

±0.25% (+0.001Ω)

Leach Resistance

Molten Solder 250°C

90 seconds minimum

IRC’s LRF3W series combines high power capabilities with small chip

size and very low resistance to handle your current sensing needs.

The LRF3W utilizes IRC’s proprietary thick film materials which possess superior thermal conductivity over

other technologies. The result is significantly lower operating temperature and higher power dissipation.

Termination on the long sides minimizes TCE mismatch to PCBs.

Resistance

Range(Ω)

Absolute

TCR

(ppm/°C)

Available Absolute

Tolerances

Rated

Power @

70° (W)

Voltage

Rating

(V)

Operating

Temperature

Range

Termination

0.002 - 0.004

±550

±5%, ±10%

3.0*

P x R

-55°C to +150°C

Sn/Pb solder or matte tin

plated over nickel

0.005 - 0.100

±100

±1%, ±2%, ±5%, ±10%

√