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OARS3R005JLF Datasheet(PDF) 2 Page - IRC - a TT electronics Company. |
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OARS3R005JLF Datasheet(HTML) 2 Page - IRC - a TT electronics Company. |
2 / 4 page Wire and Film Technologies Division Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com February 2009 Issue Page 2 of 4 • 4222 South Staples Street • Corpus Christi Texas 78411 USA OARS-3 Open Air Sense Resistors Metal Alloy Strip 25 60 95 130 165 195 225 3.5 3.0 2.5 2.0 1.0 0.0 Ambient Temperature (°C) Power Derating Curve Environmental Data Test Spec: AEC Q200 2m - 3m 4m - 15m TCR +125 to -55°C 240ppm 40ppm Thermal Shock <0.75% <0.75% High Temperature Exposure 125°C <1.75% <0.5% Temperature Cycling: -40 to +125°C <1.0% <1.0% Operational Life <2.0% <1.0% Baised Humidity <0.75% <0.5% Mechanical Shock <1.5% <1.0% Vibration <1.0% <1.0% Moisture Resistance <1.0 <2.5% Terminal Strength Meets JIS-C-6429 Solvent Resistance Meets MIL-STD-202 Method 215 Solderability Meets J-STD-002 Method B Note: The power derating curve is a guidance based on a con- servative design model. The OARS 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. The thermal image (not a simulation) to the left is of an OARS 5 m Ω running at 4 Watts, which exceeds the 1 Watt conserva- tive model. Notice the hotpsot is nearly 230°C, but the solder joint is approximately 110°C (FR4 is rated for 130°C). The unique construction of the OARS 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 R005 Thermal Image @ 4 Watts Ambient conditions, No forced air. |
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