Open Air Sense Resistors OAR SERIES ● 1, 3 and 5 watts ● ±1% or ±5% tolerance ● Resistance wire TCR ±20 ppm/°C ● Resistance values down to 0R005 ohms Electrical Data Power rating at 85°C Resistance range OAR-1 1 0R005* to 0.10 watts ohms OAR-3 3 0R005 to 0.10 OAR-5 5 0R005 to 0.05 * Contact factory for values below 0R005 ohms Physical Data Dimensions (mm) Type A OAR-1 11.43 +1.020/-0.508 OAR-3 15.24 +1.020/-0.50 OAR-5 20.32 +1.020/-0.50 B 5.08 ±2.54 25.4 max. 25.4 max. C 3.18 ±0.762 3.18 ±0.762 3.18 ±0.762 E 1.65 +0.254/-0.127 1.65 +0.254/0.127 1.65 ±0.254/-0.127 F 1.02 ±0.051 1.02 ±0.051 1.02 ±0.051 On lower ranges stand-off may be eliminated B NOTE: Contact factory for: 1. Variations of ‘A’ dimension 2. Different lead diameter C A Test Point (Kelvin connection) F E Height Standards All Resistances are in ohms. All Tolerances ±0.100. Dimensions (mm) OAR-1 Resistance 0.005 - 0.100 Height 5.080 OAR-3 Resistance 0.005 Height 16.002 0.010 16.510 0.015 16.510 0.020 17.018 0.025 22.098 OAR-5 Resistance 0.005 Height 15.240 0.010 19.304 0.015 19.304 0.020 22.860 0.025 22.860 0.030 22.860 0.040 16.002 0.050 18.288 0.070 22.860 0.080 21.590 0.10 22.860 General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn’s own data and is considered accurate at time of going to print. © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, England Tel: 01670 822181 Fax: 01670 829465 Web: http://www.Welwyn-TT.co.uk Issue A 07/99 101 Open Air Sense Resistors OAR SERIES Performance Data Load life: 1000 hrs at 25°C Moisture No Load 100 hrs Temperature Cycle at -40°C & +125°C (1000 cyc): FEATURES ● Welded Construction ● Flameproof ● Inductance less than 10 nanohenries ● Solderable copper leads (60/40) ∆R% ∆R% ∆R% Maximum change 1 1 1 PACKAGING Bulk packaging only. APPLICATIONS ● Current Sensing ● Feedback ● Low inductance ● Surge and pulse © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, England Tel: 01670 822181 Fax: 01670 829465 Web: http://www.Welwyn-TT.co.uk 102 Issue A 07/99