Chip Resistor Arrays Welwyn Components WNCR Series • • • • Reduced placement cost Compact size Zero ohms also available Design flexibility Electrical Data WNCR Power rating per resistor at 70°C watts 0.063 Resistance range (E24) ohms 10 to 1M TCR -55 to 125°C ppm/°C Resistance tolerance ±200 % ±5 Maximum overload voltage volts 100 Maximum working overload volts Ambient temperature range °C 50 -55 to +125 Physical Data Dimensions (mm) Type W a b c d p t 3.20 1.60 0.50 0.5 0.35 0.40 0.8 0.45 ±0.15 ±0.15 ±0.15 ±0.15 ±0.15 L W a b c d p t 3.20 1.60 0.60 0.40 0.25 0.30 0.8 0.50 ±0.10 ±0.10 ±0.15 ±0.15 ±0.15 ±0.20 WNCR 164 Concave L P t L c d c d W ±0.10 a b Terminations Type WNCR 168 Convex ±0.10 p d c d c W a Terminations b t L Schematic 8 Solderability 5 At least 95% of the terminal area shall be covered by continuous smooth new solder. Marking 1 4 Construction Substrate Resistor Terminations Alumina Ruthenium Oxide Nickel & solder plated Normal resistance value is marked on the top of the resistor with three digits. The first two digits are significant of the nominal value and the third digit is the multiplier. 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 © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com 80 Issue B · 03.02 Chip Resistor Arrays Welwyn Components WNCR Series Performance Data Typical Performance Short term overload ∆R% 2.5 Resistance to solder heat ∆R% 2.0 Temperature cycling ∆R% 2.0 Moisture load life: 1000 hrs at 40°C ∆R% 3.0 Load life: 1000 hrs at 70°C ∆R% 3.0 Low temperature exposure: 1000 hrs at -55°C ∆R% 3.0 High temperature exposure: 1000 hrs at 125°C ∆R% 3.0 Humidity exposure: 1000 hrs at 40°C ∆R% 3.0 Power Rating For ambient temperature above 70°C, the power shall be derated as follows: Percent of Rated Wattage (%) Ambient Temperature (oC) 1/16 watt / resistor at 70oC Packaging Taping Characteristics (mm) Ø1.5 +0.1 -0 4.0±0.1 2.0±0.05 8.0±0.3 1.75±0.1 3.5±0.05 B 2.75 A 4.0±0.1 WNCR t 2.0±0.05 A t B 2.0 +0.1 0.8 3.75 +0.1 -0.15 ±0.2 -0.15 Packaging Resistor arrays are supplied tape and reel. Quantity 5,000 pcs per reel. © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com Issue B · 03.02 81