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) Absolute TCR (ppm/°C) Available Absolute Tolerances 0.002 - 0.004 ±550 ±5%, ±10% Rated Power @ 70° (W) 3.0* 0.005 - 0.100 ±100 Voltage Rating (V) √P x R ±1%, ±2%, ±5%, ±10% Operating Temperature Range Termination -55°C to +150°C Sn/Pb solder or matte tin plated over nickel *Note: 3-Watt rating achieved with 500mm2 Copper pad area around each termination pad. Maximum current is 25 amps. 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% (+0.001W) Short-time Overload 5 Seconds, 2 X Rated Power Maximum 25 Amps ±0.5% (+0.0005W) High Temperature Exposure MIL-PRF-55342 100 Hours, 150°C, No Power ±0.5% (+0.0005W) 1000 Hours, 70°C, Rated Power ±1.0% (+0.0005W) MIL-STD-202 Method 106 No Bias ±0.5% (+0.0005W) MIL-PRF-55342 ±0.25% (+0.0005W) MIL-STD-202 Method 210 ±0.25% (+0.001W) Molten Solder 250°C 90 seconds minimum Load Life Moisture Resistance Low Temperature Operation Resistance To Solder Heat Leach Resistance 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 Low Range 3 Watt SMT Chip Resistor Temperature Rise Data Pulse Power Data Advanced Film Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com LRF3W Series Issue July 2008 Low Range 3 Watt SMT Chip Resistor Physical Data Power Derating Curve Ordering Data Prefix LRC - LRF3WLF - 01 - R020 - F Model LRF3W = 3 watt chip with standard Sn/Pb termination LRF3WLF = 3 watt chip with Pb-free (matte tin) termination TCR Code Resistance Code 4-Digit resistance code Example: R050 = 0.050Ω; R005 = 0.005Ω Tolerance Code K = ±10%; J = ±5%; G = ±2%; F = ±1% For additional information or to discuss your specific requirements, please contact our Applications Team using the contact details below. Advanced Film Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com LRF3W Series Issue July 2008