Surface Mount Sense Resistors OARS, OARS-XP, OARSZ Series Flexible leads for thermal expansion Open-air design reduces PCB heating Values down to 1m Element TCR 20ppm/C Zero-ohm 65A jumper version RoHS compliant Electrical Data OARS1 OARS-XP watts 2 4 Power rating at 25C Power rating at 85C watts 1 2 Resistance range ohms R002 to R050 R001 to R025 Resistance Tolerance % R002: 5, > R002: 1, 5 Standard Values milliohms 2, 3, 4, 5, 10, 15, 20, 22, 25, 30, 40, 50 1, 2, 2.5, 5, 7.5, 10, 20, 25 (Enquire for unlisted values) Inductance nH <10 Ambient temperature range C -55 to +160 OARS-1Z Comments amps 65 Current rating at 25C Zero-ohm jumper Current rating at 85C amps 46 Ambient temperature range C -55 to +160 Physical Data Dimensions (mm) and recommended solder pads Type L H T D W a nom. b nom. c nom. d nom. 3.05 OARS1 >R003, OARS-1Z 0.76 11.18 4.83 3.18 4.07 0.38 0.76 0.38 OARS1-R003 9.37 3.07 3.51 2.36 3.23 0.76 0.25 11.56 4.7 3.56 OARS1-R002 4.45 0.76 0.38 0.38 10.7 to 2.28 to 4.83 6.35 OARS-XP 7.24 9.58 3.18 12.0* 4.57* 0.76 0.38 * Dependent on ohmic value b c c d a 07.11Surface Mount Sense Resistors OARS, OARS-XP, OARSZ Series Performance Data (AEC-Q200) OARS1 <R004 R004 to R015 >R015 OARS-XP <R002 R002 to R007 >R007 TCR (-55 to 125C) ppm/C 240 40 40 Thermal Shock R% 0.75 0.75 0.75 High Temp. Exposure (125C) R% 1.75 0.5 1 Temp. Cycling (-40 to 125C) R% 1 1 0.75 Operational Life R% 2 1 1 Biased Humidity R% 0.75 0.5 0.5 Mechanical Shock R% 1.5 1 1 Vibration R% 1 1 1 Terminal Strength Meets JIS-C-6429 Solvent Resistance Meets MIL-STD-002 Method 215 Solderability Meets J-STD-002 Method B Temperature Derating Pulse Energy Rating 120 120 100 100 80 80 60 60 40 20 40 0 20 1 10 100 0 Value (milliohms) 0 25 50 75 100 125 150 175 OARS1 OARS-XP Ambient Temperature (Deg C) Note: For OARS-1Z the above derating graph may be applied to Note: This graph relates to single pulses of short duration ( 100ms). the square of the current rating. Higher energy limits apply for longer pulses and overloads Joint Temperature Rise Hot Spot Temperature Rise 7.6mm x 7.6mm pads, 2 oz copper on FR4, still air 7.6mm x 7.6mm pads, 2 oz copper on FR4, still air 100 300 Value in milliohms Value in milliohms OARS1 / OARS-XP OARS1 / OARS-XP 250 80 50 / 25 5 / - 200 60 10 / 5 30 / 15 150 10 / 5 30 / 15 40 100 5 / - 50 / 25 20 50 0 0 25% 50% 75% 100% 25% 50% 75% 100% Proportion of Rated Power Proportion of Rated Power Note: Temperature rise data are given here for typical mounting conditions. Actual figures depend on PCB copper weight, mounting pad size, track width and substrate type. Also, the open air format responds better to forced air cooling than chip format resistors. For values below 5 milliohms allowance should be made for heat generated in the copper tracks themselves. Application-specific guidance is available on request. 07.11 % of Rated Power Temperature Rise (K) Temperature Rise (K) Energy (J)