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| General Purpose Cement Coated Wirewound Resistors WA80 Series Welwyn Components * Cost effective * Flameproof protection * Can replace carbon comp. in many applications * Resistance values down to 0.01 ohms * Ideal for pulse handling applications Electrical Data WA82 Power rating at 25c Power rating at 70c Resistance range Limiting element voltage Isolation voltage TCR Resistance tolerance Values Thermal impedance Ambient temperature range C/watt C 140 110 82 - 55 to 155 watts watts ohms volts volts ppm/C % 1 .86 0R068 to 430 50 250 WA83 2.0 1.6 0R05 to 900R 50 250 <1:350 <20R: 5, 10 20R: 1, 2, 5, 10 90 54 35 E24 preferred WA835 2.5 2.0 0R05 to 900R 75 250 WA84 3.0 2.5 0R01 to 2K2 100 350 WA85 5 4.3 0R015 to 6K8 150 500 >1:200 WA87 7 6 0R15 to 10K 150 700 Physical Data Dimensions (mm) and Weight (g) PCB mounting centres 10.20 12.70 18.40 20.30 22.86 31.40 Min bend radius 0.6 1.2 1.2 1.2 1.2 1.2 Wt nom. 0.22 0.50 0.50 1.10 1.75 4.40 d D L f Type WA82 WA83 WA835 WA84 WA85 WA87 L max. 6.2 9.0 12.5 14.5 16.5 25.0 D max. 2.8 3.6 4.5 5.2 7.0 8.8 f min. 21.20 19.80 17.80 24.55 23.55 28.30 d nom. 0.6 0.8 0.8 0.8 0.8 0.8 Construction A high quality ceramic substrate is assembled with interference fit end caps to which are welded the termination wires. The resistive element is wound on the substrate and welded to the caps. Cement protection is applied to the resistor body before marking with indelible ink. Terminations Material Strength Solder-coated copper wire on 82, 83, 835, 84, and 85, solder coated cooper clad steel on 87. The terminations meet requirements of IEC 68.2.21. Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2. 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 (c) 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 89 General Purpose Cement Coated Wirewound Resistors WA80 Series Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning fluids suitable for printed circuits. Welwyn Components Marking WA85 and 87 resistors are legend marked with type reference, resistance value and tolerance. In conformance with IEC 62. WA82, 83, 835 and 84 resistors 0R1 and above are colour coded with 4 bands in conformance with IEC 62. Values below 0R1 are 3 band marked, two digits and tolerance, there is no multiplier band. Flammability The resistor coating will not burn under any condition of applied temperature or component overload. Performance Data Maximum Load at rated power: 1000 hrs at 25 or 70c Dry heat: 1000 hrs at 200c Derating from rated power at 25c Short term overload Climatic Climatic category Long term damp Heat: 56 days T.R.C. & Vibration Robustness & Solder Heat Pulse Handling R% R% R% R% R% R% 5.0 + .001 5.0 + .001 55/200/56 5.0 + .001 5.0 + .001 5.0 + .001 Data available by request 1.0 1.0 1.0 R% R% 5.0 + .001 5.0 + .001 See derating curve 1.0 2.0 Typical 3.0 3.0 % of Rated Power at 70C Application Notes Care must be taken when determining clearance between the resistor body and the P.C.B. or other components. Resistance is measured 6mm from body. WA80 Series Derating Curve 130 120 110 100 90 80 70 60 50 40 30 20 10 0 20 Packaging All resistors are supplied tape packed ready for loading onto automatic sequencing and insertion machines. The critical dimensions are shown in figure 2. Component wires will not protrude beyond the outside edge of the tapes. All taped resistors will be supplied either on reels or in ammopacks, depending upon quantities orderded. WA series resistors can be supplied preformed. Contact factory for details. Type b c WA82 52 5 WA83 52 5 WA835 52 5 WA84 67 10 WA85 63 10 WA87 85 10 40 60 80 100 120 140 160 180 200 220 240 260 280 TempC Figure 2 c f1 6 b f2 6 Body Location f1 - f2 1.4 mm Standard Quantities Per Package Type Reel Large ammo pack WA82 WA83 WA835 WA84 WA85 WA87 5000 5000 2500 2500 2500 1500 1000 1000 750 700 700 n/a (c) 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 90 Issue D * 08.04 General Purpose Cement Coated Wirewound Resistors WA80 Series Welwyn Components Ordering Procedure Specify type reference, value and tolerance as shown in this example of WA82 480R 5%: Type Resistance value (IEC62 code) Tolerance (IEC62 code) F G J 1% 2% 5% WA82 480R J (c) 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 Issue D * 08.04 |
Price & Availability of WA80
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