Resistors Surface Mount Sense Resistors Surface Mount Sense Resistors OARS, OARS-XP, OARSZ Series Surface Sense Resistors OARS, OARS-XP,Mount OARSZ Series Flexible leads for thermal expansion Open-air design reduces heating Flexible leads for thermalPCB expansion Values downdesign to 1m Open-air reduces PCB heating Element TCR 20ppm/C down to 1milliohm OValues ARS,65A OARS-XP, OARSZ Series Zero-ohm jumper version TCR to 40ppm/C (Element 20ppm/C) RoHS * compliant Flexible leads for thermalTCR expansion jumper versionPCB heating * Zero-ohm Open-air65A design reduces * Values down to 1m * Element TCR 20ppm/C Electrical Data * Zero-ohm 65A jumper version * RoHS compliant Power rating at 25C Electrical Data Power rating at 85C Electrical Data Resistance range Resistance Tolerance Power rating Standard Values Power rating at at 70C ambient, or 25C 140C (Enquire for unlisted values) terminal temperature Power rating at 85C watts watts ohms % All parts are Pb-free and comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3) OARS1/3 OARS-XP 2 4 1 2 R002 to R050 R001 to R025 OARS1 OARS3 OARS-XP OARS1 R002: 5, > R002: 1, 5 OARS-XP watts 2 25, 30, 40, 503 2 20, 22, milliohmswatts 2, 3, 4, 5, 10, 15, watts nHohms ohms C % % Inductance Resistance range Resistance range Resistance Tolerance AmbientResistance temperature range Tolerance Standard Values Standard Values milliohms milliohms (Enquire for for unlisted unlisted values) (Enquire values) amps nH Current Inductance rating at 25C temperature range amps C Ambient Current rating at 85C Ambient temperature range C 4 10, 5 20, 25 1, 2, 2.5, 5, 7.5, 1 2 <10 R002 to R002 R050 to R050 R002 to R015 to R025 R001R001 to R025 R002: 5, > R002: 1, 5 -55 to +160 R002: 5, > R002: 1, 5 2, 3, 4, 5, 10, 15, 20, 1, 2, 2.5, 5, 7.5, 2, 3,40, 4, 50 5, 10, 151, 2, 2.5, 5, 7.5, 10, 20, 25 2, 22, 3, 4,25, 5, 30, 10, 40, 15, 50 20, 22, 25, 30, 12.5, 10, 20, 25 OARS-1Z Comments <10 <10 65 -55 -55 to to +160 +160 Zero-ohm jumper 46 -55 to +160 amps milliohms amps C Dimensions (mm) and recommended solderCpads OARS-1Z OARS-1Z Current rating Current rating at at25C 25Cambient Physical Data Max residual resistance Current rating at 85C Ambient temperature Ambient temperature range range Type Physical Data L H T 3.05 OARS1/3 > R003, OARS-1Z Temperature Derating 0.76 Dimensions (mm) and recommended solder pads 11.18 Type OARS1/3 - R003 0.38 L H D T W 4.83 0.76D 3.51 3.05 2.36 OARS1 >R003, OARS-1Z 11.5611.18 0.760.76 0.25 4.74.83 OARS1/3 - R002 0.38 0.76 0.76 0.38 OARS1-R003 3.51 2.36 10.7 to 2.28 to 4.83 OARS-XP 0.25 11.564.57*0.76 4.7 0.76 12.0* OARS1-R002 * Dependent on ohmic value OARS-XP * Dependent on ohmic value 0.38 10.7 to 12.0* Comments Comments 65 65 46 0.3 to +160 -55 to-55 +160 2.28 to 4.57* 0.76 Zero-ohm jumper Zero-ohm jumper a nom. b nom. c nom. d nom. 3.18 4.07 0.38 W a nom. b nom. c nom. d nom. 3.18 3.56 4.07 4.45 6.35 7.24 0.38 0.38 3.56 0.38 4.45 0.38 4.83 6.01 0.76 7.24 0.38 OARS1/3/XP a 9.37 3.07 3.18 9.58 3.18 b d c 3.07 9.58 b d c OARSZ 9.37 3.23 3.23 c c a Note: For OARS1/3/XP this relates to power rating, for OARSZ it relates to current rating. General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics' own data and is considered accurate at time of going to print. (c) TT Electronics plc BI Technologies IRC Welwyn www.ttelectronics.com/resistors 07.11 07.11 09.18 Surface Mount Sense Resistors Surface Mount Sense Resistors OARS, OARS-XP, OARSZ Series OARS, OARS-XP, OARSZ Series Performance Electrical Data Data (AEC-Q200) OARS1 OARS3 OARS-XP OARS1/3 <R004 R004 to R015 watts 2 3 5 at 70C ambient, or 140C OARS-XP <R002 R002 to R007 terminal temperature Resistance range to 125C) ohms R002 toppm/C R050 R002 to240 R015 R001 to R025 40 TCR (-55 Resistance Tolerance % R002: 1, 5 Thermal Shock R% R002: 5, >0.75 0.75 2, 3, 4, 5, 10, 15, 20, 1, 2, 2.5, 5, 7.5, Standard Values milliohms 2, 3, 4, 5,1.75 10, 15 High Temp. Exposure (125C)22, 25, 30, 40, R% (Enquire for unlisted values) 50 12.5, 10, 20, 25 0.5 Inductance nH <10 1 Temp. Cycling (-40 to 125C) R% 1 Ambient temperatureLife range C -55 to +160 Operational R% 2 1 Biased Humidity R% 0.75 0.5 OARS-1Z Comments Current rating at 25C Shock ambient amps Mechanical R% 65 1.5 1 Max residual resistance milliohms Zero-ohm jumper Vibration R% 0.3 1 1 Ambient temperature range C -55 to +160 Terminal Strength Meets JIS-C-6429 Solvent Resistance Meets MIL-STD-002 Method 215 Solderability Meets J-STD-002 Method B Temperature Derating Power rating Tem perature Derating Pulse Energy Rating 100 Energy (J) % of Rated Power 120 80 OARS1/3/XP 60 OARSZ 40 20 120 100 80 60 40 20 0 1 10 Note: For 0 OARS1/3/XP this relates to power rating, for OARSZ it relates to current rating. 0 25 50 75 100 125 150 OARS1/3 Note: For OARS-1Z the above derating graph may be applied to the square of the current rating. Joint Temperature Rise Hot Spot Temperature Rise 7.6mm x 7.6mm pads, 2 oz copper on FR4, still air 50 / 25 30 / 15 150 10 / 5 100 5/- 50 50% 75% 100% Temperature Rise (K) Temperature Rise (K) Value in m illiohm s OARS1/3 / OARS-XP 200 0 25% OARS-XP Note: This graph relates to single pulses of short duration ( 100ms). Higher energy limits apply for longer pulses and overloads 7.6m m x 7.6m m pads, 2 oz copper on FR4, still air 250 100 Value (m illiohm s) 175 Am bient Tem perature (Deg C) 300 >R015 >R007 40 0.75 1 0.75 1 0.5 1 1 100 Value in milliohms OARS1/3 / OARS-XP 80 5/- 60 10 / 5 30 / 15 40 50 / 25 20 0 25% Proportion of Rated Power 50% 75% 100% 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 General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics' own data and is considered accurate at time of going to print. BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc 09.18 Surface Mount Sense Resistors OARS, OARS-XP, OARSZ Series Thermal Performance Examples OARS1-R005 at 2W OARSXP-R0025 at 5W These thermal images were taken under ambient conditions of still air at 25C with the components mounted on horizontal standard test boards as defined below. JEDEC standard circuit board: 2" (50.8mm) square FR4 2 outer power planes, 2 ounce (70) Cu 1" (25.4mm) square exposed 2 inner signal planes, 1 ounce (35) Cu (continuous planes) In contrast to the flat chip format, the OARS format keeps the hot spot thermally distant from the solder j oints and reduces undesirable heat delivery into the PCB. Further thermal images for other ohmic values and power dissipations are available on request. Kelvin (4 Terminal) Mounting For high precision applications a Kelvin (4 Terminal) mounting method is recommended. An example to illustrate the design principle is shown. High current connections are made to the two pairs of larger pads, whilst the voltage sense connections are made to the two smaller central pads. General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics' own data and is considered accurate at time of going to print. BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc 09.18 Surface Mount Sense Resistors OARS, OARS-XP, OARSZ Series Standard 4-Terminal Probe Positions for Measuring Unmounted Parts Standard 4-Terminal Probe Positions for Measuring Unmounted Parts 0.79 6.35 0.79 6.35 O 0.76 O 0.76 1.27 1.27 Surface Mount Sense Resistors 7.94 OARS, OARS-XP, OARSZ Series All dimensions in mm All dimensions in mm 7.94 Construction Copper terminations are welded to resistance alloy strip which is then formed. Value adjustment is achieved by control of width, without the need for subsequent abrasion or notch trimming. Pb-free termination finish is 96% Sn / 4% Ag alloy. Flammability The resistor will not burn or emit incandescent particles under any condition of applied temperature or overload. Marking The parts are legend marked with ohmic value and tolerance code. Packaging Data Dimensions (mm) Type OARS1/3, OARS-1Z OARS-XP-R001 OARS-XP >R001 A 4.320.08 7.210.1 B 11.70.08 11.940.1 11.560.1 C D E 240.3 11.50.1 1.750.1 General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics' own data and is considered accurate at time of going to print. F 80.1 120.1 G 40.1 BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc 09.18 Surface Mount Sense Resistors OARS, OARS-XP, OARSZ Series Ordering Procedure Ordering Procedure This product has two valid part numbers: European (Welwyn) Part Numbers: O A R S 1 OARS1-R01JI (OARS1, 10 milliohms 5%, Pb-free) OARS-1Z (OARS-1Z, Pb-free) - R 0 1 2 J I 3 4 1 2 3 4 Type Value Tolerance Termination & Packing F = 1% J = 5% I = Pb-free, Tape & Reel OARS1, OARS3 1900/reel OARS-XP 1200/reel OARS1 3-5 characters OARS3 See Electrical Data R = ohms OARS-XP O 1 A R S - 1 Z 1 1 Type OARS-1Z No value or tolerance applies. Termination is Pb-free. Packing is Tape & Reel, 1900/reel. USA (IRC) Part Numbers: O A R S OARS1R010JLF (OARS1, 10 milliohms 5%, Pb-free) OARS-1ZLF (OARS-1Z, Pb-free) 1 R 0 1 2 0 J 3 L F 4 1 2 3 4 Type Value Tolerance Termination & Packing F = 1% J = 5% LF = Pb-free OARS1, OARS3 1900/reel OARS-XP 1200/reel OARS1 4/5 characters OARS3 See Electrical Data R = ohms OARS-XP O 1 A R S 1 - 1 Z L F 2 1 2 Type Termination & Packing OARS-1Z No value or tolerance applies. LF= Pb-free, Tape & Reel, 1900/reel. General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics' own data and is considered accurate at time of going to print. BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc 09.18