Low Range 3 Watt
SMT Chip Resistor
LRF3W Series
•
•
•
•
•
Tolerances to ±1%
3 Watt @70°C power dissipation in a compact 1225 package
Resistance range from 0.002 to 0.100Ω
Ideal for high current sensing applications
Standard Sn/Pb and Pb-free (matte tin) terminations available
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.
Electrical Data
Resistance
Range(Ω)
0.002 - 0.004
0.005 - 0.100
Absolute
TCR
(ppm/°C)
±550
±100
Available Absolute
Tolerances
±5%, ±10%
3.0*
±1%, ±2%, ±5%, ±10%
Rated
Power @
70° (W)
Voltage
Rating
(V)
Operating
Temperature
Range
Termination
√
P x R
-55°C to +150°C
Sn/Pb solder or matte tin
plated over nickel
*Note: 3-Watt rating achieved with 500mm
2
Copper pad area around each termination pad. Maximum current is 25 amps.
Environmental Data
Environmental Test
Thermal Shock
Short-time Overload
High Temperature Exposure
Load Life
Moisture Resistance
Low Temperature Operation
Resistance To Solder Heat
Leach Resistance
Test Method
MIL-STD-202 Method 107
Condition F, -65°C to +150°C
5 Seconds, 2 X Rated Power
Maximum 25 Amps
MIL-PRF-55342
100 Hours, 150°C, No Power
1000 Hours, 70°C, Rated Power
MIL-STD-202 Method 106
No Bias
MIL-PRF-55342
MIL-STD-202 Method 210
Molten Solder 250°C
Performance (Resistance Change)
±0.25% (+0.001Ω)
±0.5% (+0.0005Ω)
±0.5% (+0.0005Ω)
±1.0% (+0.0005Ω)
±0.5% (+0.0005Ω)
±0.25% (+0.0005Ω)
±0.25% (+0.001Ω)
90 seconds minimum
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.
Advanced Film Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
A subsidiary of
TT electronics plc
LRF3W Series Issue July 2008
IRCTT [ IRC - A TT ELECTRONICS COMPANY. ]
