Open Air Current Sense Resistors ��������� ������� OAR Series • • • • • TCR’s to ±20ppm/°C Power ratings of 1, 3, & 5W @ 85°C Resistance range from 2.5mΩ to 100mΩ Open air design maximizes thermal performance Welded copper leads minimize effects from solder wicking and provide true 1% performance ������� ����� Features: Applications: • Welded construction • Current sensing • Flameproof • Feedback • Inductance less than 10 nanohenries • Low inductance • Solderable copper leads (60/40) • Surge and pulse ����� ���� ��������� Electrical Data Part Number Power Rating @ 85°C (watts) Resistance Range (mΩ) OAR-1 1.0 3, 5, 10, *20, *25, 50 OAR-3 3.0 2.5, 5, 10, 15, 20, 25, *30, 50, 100 OAR-5 5.0 3, 5, 10, *15, *20, *25, *50 Tolerance (±%) TCR (±ppm/°C) Inductance (nH) 1, 2¹, 5 20 <10 Notes: ¹ ±2% tolerance available <0.005mΩ * denotes resistance values that may have longer lead times than other values listed * Please contact factory for resistance values not listed Environmental Data Load Life (1000 hours @ 25°C) ∆R/R <1% Moisture (no load for 1000 hours) ∆R/R <1% Temperature Cycling (-40°C to +125°C for 1000 cycles) ∆R/R <1% Operating Temperature -40°C to +125°C 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 OAR Series Issue November 2008 Sheet 1 of 2 Open Air Current Sense Resistors Physical Data On lower ranges stand-off may be eliminated NOTE: Contact factory for: 1. Variations of “A” dimension. 2. Different lead diameter. B C E F A Test Point (Kelvin connection) Dimensions (Inches and (mm)) IRC Type OAR-1 OAR-3 OAR-5 A B C E F 0.450 +0.040/-0.020 0.200 ±0.100 0.125 ±0.030 0.065 +0.010/-0.005 0.040 ±0.002 (11.43 +1.020/-0.508) (5.08 ±2.54) (3.18 ±0.762) (1.65 +0.254/-0.127) (1.02 ±0.051) 0.600 +0.040/-0.020 0.600 Typ 0.125 ±0.030 0.065 +0.010/-0.005 0.040 ±0.002 (15.24 +1.020/0.508) (15.3 max.) (3.18 ±0.762) (1.65 +0.254/-0.127) (1.02 ±0.051) 0.800 +0.040/-0.020 0.350 Typ 0.125 ±0.030 0.065 +0.010/-0.005 0.040 ±0.002 (20.32 +1.020/-0.508) (8.9 max.) (3.18 ±0.762) (1.65 +0.254/-0.127) (1.02 ±0.051) Ordering Data Sample Part No. OAR 1 R100 F LF IRC Style OAR Power Rating in Watts 1 = 1W 3 = 3W 5 = 5W Resistance Range ‘R’ indicates decimal point location Tolerance F = ±1%, G = ±2%, J = ±5% RoHS Indicator LF indicates RoHS compliance Blank indicates Sn/Pb terminal tinning; available on special request 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 OAR Series Issue November 2008 Sheet 2 of 2