OARS XP Open Air Sense Resistors Metal Alloy Strip OARS-XP Series • • • • • • • Zero ohm jumper available Resistance values 1mΩ to 25mΩ ±1% or ±5% tolerance Open air design provides cooler operation Lead Free RoHS compliant construction available Extended power surface mount current sense resistor Unique form factor provides TCE compliant termination Electrical Data Resistance Value (Ω) Available Tolerances (%) Absolute TCR (ppm/°C) Rated Power (W) 0.001 0.002 ±1, ±5 ±1, ±5 ±240 ±40 5 5 0.005 0.010 ±1, ±5 ±1, ±5 ±40 ±40 5 5 0.020 0.025 ±1, ±5 ±1, ±5 ±40 ±40 5 5 Features: Applications: • Superior thermal expansion cycling • Current sensing • Inductance less than 10 nanohenries • Feedback • Flameproof • Low inductance • Lead flexible for thermal expansion • Surge and pulse • AC applications (please contact factory) Electrical Data Test Spec: AEC Q200 1mΩ 2mΩ - 7mΩ >7mΩ TCR +125 to -55°C 240ppm 40ppm 40ppm Thermal Shock <0.75% <0.75% <0.75% High Temperature Exposure 125°C <1.75% <0.5% <1.0% Temperature Cycling: -40 to +125°C <1.0% <1.0% <0.75% Operational Life <2.0% <1.0% <1.0% Biased Humidity <0.75% <0.5% <0.5% Mechanical Shock <1.5% <1.0% <1.0% Vibration <1.0% <1.0% <1.0% <1.0 <2.5% <2.0 Moisture Resistance Terminal Strength Solvent Resistance Solderability Meets JIS-C-6429 Meets MIL-STD-202 Method 215 Meets J-STD-002 Method B 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. Wire and Film Technologies 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 OARS-XP Issue May 2009 Sheet 1 of 3 OARS XP Open Air Sense Resistors Metal Alloy Strip Physical Data L W H D T Dimensions (Inches and (mm)) IRC Type L (Resistance Dependant) H (Resistance Dependant) T D W 0.425 - 0.470 0.090 - 0.180 0.093 ± 0.010 0.190 ± 0.030 0.250 ± 0.015 (10.7 - 12.0) (2.28 - 4.57) (2.36 ± 4.57) (4.83 ± 0.76) (6.35 ± 0.38) OARS-XP Power Derating Curve 6.0 Note: The power derating curve is a guidance based on a conservative design model. The OARS XP is a solid metal alloy construction that can withstand significantly greater operating temperatures than conservative design models permit. The resistive alloys can withstand temperatures in exess of 350°C. Therefore, the system thermal design is a more significant design parameter due to the heat limitations of solder joints and/or circuit board substrate materials. Refer to additional information below. Power Rating (watts) 5.0 4.0 3.0 2.0 0.0 25 60 95 130 165 195 225 Ambient Temperature (°C) The thermal image (not a simulation) to the left is of an OARS XP 2.5 mΩ running at 5 Watts. Notice the hotpsot is nearly 205°C, but the solder joint is approximately 115°C (FR4 is rated for 130°C). The unique construction of the OARS XP isolates the hotspot from the circuit board material preventing damage. Additionally, the thermal energy is dissipated to the air instead of being conducted into the circuit board potentially causing a nearby power component to exceed its rating. The standard test circuit board consists of a four layer FR4 material with 2 ounce outer layers and 1 ounce inner layers, which is typical of many industry designs. Contact IRC for more details or for other thermal image test data for specific resistance values and power levels. OARS XP R0025 Thermal Image @ 5 Watts Ambient conditions, No forced air. Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com OARS-XP Issue May 2009 Sheet 2 of 3 OARS XP Open Air Sense Resistors Metal Alloy Strip Pulse/Surge Chart Note: The high pulse surge capability of the OARS parts is attributed to the solid metal alloy construction. In many applications the cross-section of the OARS is greater than the cross-section of the board traces connecting the parts to the circuit board. Joules (watts-second) 120 100 80 60 Cross-Sectional area ranges from approximately 1375 mils to 7250 mils. 40 20 0 0 5 10 15 20 25 30 Resistance (milli ohms) Recommended Pad Layout OARS XP PAD (4 TERMINAL) 0.377 (9.58) 0.418 (10.57) 0.125 (3.18) 0.125 (3.18) 0.145 (3.67) 0.113 (2.79) 0.280 (7.11) 0.280 (7.11) 0.020 (0.51) 0.020 (0.51) OARS XP PAD (2 TERMINAL) 0.145 (3.67) 0.060 (1.52) 0.280 (7.11) 0.280 (7.11) 0.060 (1.52) 0.110 (2.79) 0.127 (3.23) 0.125 (3.16) 0.125 (3.16) 0.242 (6.15) 0.020 (0.51) 0.242 (6.15) 0.127 (3.23) 0.011 (15.52) NOTE: “RECOMMENDED VOLTAGE SENSE PADS FOR KFT VIN CONNECTION” 0.242 (6.15) 0.242 (6.15) 0.011 (15.52) Ordering Data Sample Part No. OARS - XP R005 J LF IRC Type OARS Size Resistance Range (ohms) Tolerance (F = ±1%, J = ±5%) RoHS Indicator Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com OARS-XP Issue May 2009 Sheet 3 of 3