OAR-5

OAR_D.qxd 8/9/04 4:15 PM Page 1 Open Air Sense Resistors OAR Series Welwyn Components • • • • 1, 3 and 5 watts ±1% or ±5% tolerance Resistance wire TCR ±20 ppm/°C Resistance values down to 0R005 ohms Electrical Data OAR-1 Power rating at 85°C Resistance range * Contact factory for values below 0R005 ohms OAR-3 3 0R005 to 0.10 OAR-5 5 0R005 to 0.05 watts ohms 1 0R005* to 0.10 Physical Data Dimensions (mm) Type OAR-1 OAR-3 OAR-5 A 11.43 +1.020/-0.508 15.24 +1.020/-0.50 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 C NOTE: Contact factory for: 1. Variations of ‘A’ dimension 2. Different lead diameter A F Test Point (Kelvin connection) E 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. A subsidiary of TT electronics plc Issue D · 08.04 © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com 101 OAR_D.qxd 8/9/04 4:15 PM Page 2 Open Air Sense Resistors OAR Series Welwyn Components Height Standards All Resistances are in ohms. All Tolerances are ±2.54. Dimensions (mm) OAR-1 Resistance Height OAR-3 Resistance Height OAR-5 Resistance Height 0.005 15.240 0.010 19.304 0.015 19.304 0.020 22.860 0.025 22.860 0.005 16.002 0.010 16.510 0.015 16.510 0.020 17.018 0.025 22.098 0.030 22.860 0.040 16.002 0.050 18.288 0.070 22.860 0.080 21.590 0.10 22.860 0.005 - 0.100 5.080 Performance Data Maximum change Load life: 1000 hrs at 25°C Moisture No Load 100 hrs Temperature Cycle at -40°C & +125°C (1000 cyc): ∆R% ∆R% ∆R% 1 1 1 Features • Welded Construction • Flameproof • Inductance less than 10 nanohenries • Solderable copper leads Applications • Current Sensing • Feedback • Low inductance • Surge and pulse Packaging Bulk packaging only. Ordering Procedure Specify type reference, value and tolerance as shown in this example of OAR-1 R10 1%: Type Resistance value (IEC62 code) Tolerance (IEC62 code) F G J 1% 2% 5% OAR-1 R10 F © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com 102 Issue D · 08.04