Resistors Cement Coated Surface Cement Coated Surface Cement Coated Surface Mount WMount Wirewound Resistorsirewound Resistors Welwyn Components Mount Wirewound Resistors WA80Z Series WWA80Z SeriesA80Z Series All welded construction FeaAll welded constructiontures Suitable for automatic pick and place All welded construction Suitable for automatic pick and place Excellent pulse handling capability Suitable for automatic pick and place Excellent pulse handling capability Fuses safely under fault conditions Excellent pulse handling capability Fuses safely under fault conditions Competitive cost Fuses safely under fault con ditions Performance equivalent to 2, 3 & 5W axial resistors Competitive cost Comp etitive cost Performance equivalent to 2, 3 & 5W Performance equivalent to 2, 3 & 5W axial resistors axial resistors AllAll Pb-Pb-frfreeee partsparts ccomplyomply withwith EUEU DirDirectivectivee 2011/65/EU2011/65/EU amended amended b yb y(EU) (EU) 2015/863 2015/863 (R (RoHS3)oHS3) Electrical Data WA83Z WA84Z WA85Z Power rating at 25C watts 2 3 5 Resistance range ohms 0R05 to 900R 0R01 to 2K2 0R015 to 6K8 Limiting element voltage volts 50 100 150 Isolation voltage volts 250 350 500 TCR ppm/C 1R0:350 >1R0:200 Resistance tolerance % <20R: 5, 10 20R: 1, 2, 5, 10 Standard values E24 series preferred Ambient temperature range C -55 to 155 Physical Data Dimensions (mm) W I Type L W H l wd H WA83Z 13.40.2 3.6 max 6.25 max 9.0 max 4.50.6 0.8 nom L WA84Z 18.70.2 5.2 max 6.9 max 14.5 max 6.50.6 0.8 nom w WA85Z 18.70.2 7.0 max 7.9 max 16.5 max 6.50.6 0.8 nom d Recommended Pad Sizes Dimensions (mm) B C Type A B C D A WA83Z 5.5 2.5 min 10 max 15 min WA84Z 7.5 min 2.5 min 15 max 20 min D WA85Z 7.5 min 2.5 min 15 max 20 min Construction the caps. Flameproof silicone cement coating is applied A high purity ceramic substrate is assembled with interference prior to marking with indelible ink and lead forming. fit end caps to which are welded the terminations. The resistive element is wound on the substrate and welded to General Note General Note General Note BI Technologies IRC Welwyn Welwyn Components reserves the right to make changes in product specification without notice or liability. TT Electronics reserves the right to make changes in product specification without notice or liability. TT electronics reserves the right to make changes in product specification without notice or liability. A subsidiary of All information is subject to Welwyns own data and is considered accurate at time of going to print. All information is subject to TT Electronics own data and is considered accurate at time of going to print. All information is subject to TT electronics own data and is considered accurate at time of going to print. TT electronics plc www.ttelectronics.com/resistors www.bitechnologies.com www.irctt.com www.welwyn-tt.com Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK TT Electronics plc Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue G 03.06 TT electronics plc 06.18 09. 11Cement Coated Surface Cement Coated Surface Cement Coated Surface Mount Wirewound Resistors Mount Wirewound Resistors Mount Wirewound Resistors WA80Z Series WA80Z Series Welwyn Components WA80Z Series Marking Solvent Resistance WA83Z and WA84Z resistors R10 and above are marked with The body protection and marking are resistant to all normal four colour bands in conformance with IEC62. Values industrial cleaning solvents suitable for printed circuits. below R10 are marked with three bands (two digits and tolerance) there is no multiplier band. WA85Z resistors are Flammability legendmarked WA85 plus resistance value and tolerance in The resistor coating will not burn under any condition of conformance with IEC62. applied temperature or component overload. Performance Data Maximum Typical Load at rated power: 1000hrs 25 or 70C R% 5 +0.001 3 Dry heat: 1000hrs 200C R% 5 +0.001 3 Short term overload R% 5 +0.001 1 Derating from rated power 25C Zero at 155C Climatic R% 5 +0.001 2 Climatic category 55/200/56 TRC & Vibration R% 5 +0.001 1 Robustness & solder heat R% 5 +0.001 1 Long term damp heat R% 5 +0.001 1 Temperature rise See Graph 1 Pulse handling See Graph 2 2 2 Note: Testing was performed on FR4 test boards measuring 50mm x 50mm, with 1oz/ft (300g/m ) copper pads. The track area 2 close to each pad was 120mm . If a lower grade of PCB or less track area is used, derating of the power may be necessary. Temperature Rise Graph 1 WA80Z Thermal Performance 260 240 220 200 180 160 140 120 100 80 60 40 20 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Power (W) WA83Z Hot Spot WA83Z Joint WA84Z Hot Spot WA84Z Joint WA85Z Hot Spot WA85Z Joint General Note General Note BI Technologies IRC Welwyn TT Electronics reserves the right to make changes in product specification without notice or liability. TT electr Welwyn Components Limitedonics reserves the right to make changes in prBedlington, Northumberland NE22 7AA, UKoduct specification without notice or liability. Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue G 03.06 All information is subject to TT Electronics own data and is considered accurate at time of going to print. All information is subject to TT electronics own data and is considered accurate at time of going to print. www.bitechnologies.com www.irctt.com wwwwww.ttelectronics.com/resistors.welwyn-tt.com TT Electronics plc TT electronics plc 06.18 09. 11 Temp Rise (K)