Resistors Cement Coated Cement Coated Wirewound Resistors Welwyn Components Wirewound Resistors W30 Series W30 Series * * * * Values down to 10m ohms Values downtoto1% 10m ohms Tolerance Tolerance to 1% Flameproof protection Flameproof protection Custom built to meet pulse requirements Custom built to meet pulse requirements Surface mount ZI-form option All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3) Electrical Data W31 Power rating at 25C watts Notes 3.0 Power rating at 70C watts 2.5 Resistance range ohms 0R01 to 10K TCR (-55 to 155C) ppm/C Resistance tolerance % Standard values See below <R10: 5 >=R10: 1, 2, 5 E24 series preferred Thermal impedance C/watt Ambient temperature range C Limiting element voltage -55 to 155 volts TCR ppm/C Other values to special order 83 100 R01: 1000 >R01 - R033: 500 >R033 - R091: 200 >R091 - 10R: 150 >10R: 100 Physical Data Maximum Dimensions (mm) and Weight (g) Type L max. D max. W31 13 5.6 (note 1) f min. 22.75 d nom. Wt.nom. 0.8 1.0 d D L f _0R1 Note 1: 5.8 for values < Construction Marking A high quality ceramic substrate is assembled with interference fit end caps to which are welded the element W31 resistors are legend marked with type reference, resistance value and tolerance. Values are marked in accordance with IEC 62. to the body, providing an effective seal which is impervious to moisture, shock, vibration, fungus and salt spray. Solvent Resistance Terminations The body and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. Material Strength Solderability GeneralNote Note General Solder coated copper. The terminations meet the requirements of IEC 68.2.21. The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2. Flammability The resistor coating will not burn under any condition of applied temperature or component overload. BI Technologies IRC Welwyn Welwyn Components reserves the right to make changes in product specification without notice or liability. TT reserves the right to make changes in product specification without at notice AllElectronics information is subject to Welwyn's own data and is considered accurate timeorofliability. going to print. All information is subject to TT Electronics' own data and is considered accurate at time of going to print. (c) Welwyn Components Limited * Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) plc 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com (c) TT Electronics A subsidiary of TT electronics plc www.ttelectronics.com/resistors Issue D * 07.06 06.18 99 Cement Coated Cement Coated Wirewound Resistors Cement Coated Wirewound Resistors W30 Series Wirewound W30 Series Welwyn Components Welwyn Components Resistors W30 Series Performance Data Performance Data Load: Maximum R% 1000 hrs 3 watts @ 25C R% R% R% R% hrs hrs 2.53watts Load:1000 1000 watts@@70C 25C Dry heat: 1000 atwatts 200C@ 70C 1000 hrshrs 2.5 DDry eratheat: ing fro1000 m roohrs m at tem perature 200C R% Typical 5.0 M+ ax.001 imum 5.0 + 5.0 +.001 .001 T3.5 ypical 3.5 3.5 5.0 5.0++.001 .001 3.5 3.5 5.0 + .001 see derating curve Short x rated for 5 seconds Deratterm ing froverload om room10 tem peratupower re R% 5.0 + .001 Climatic Short term overload 10 x rated power for 5 seconds R% R% 5.0 5.0++.001 .001 R% Climaticcategory Climatic 3.5 1.0 see derating curve 3.5 1.0 55/200/56 5.0 + .001 3.5 Climatic Long termcategory damp heat: 56 days R% 3.0 + .001 Long term damp 56 days Temperature rapid heat: change R% R% 3.0++.001 .001 2.0 1.0 1.5 Temperature rapid change Resistance to solder heat R% R% 2.0++.001 .001 5.0 Resistance tobump solder heat Vibration and Vibration and Voltage proof bump R% R% vR% olts 5.0++.001 .001 5.0 5.0 + .001 1.5 2.0 2.0 2.0 Voltahandling ge proof Pulse Pulse handling W31 Series Derating Curve Rated Power %%ofof Rated Power at at 7070 1.0 500 min 500 m Data available byinrequest Data available by request volts 130 W31 Series Derating Curve 120 130 110 120 100 110 100 90 8090 7080 6070 5060 4050 3040 2030 1020 010 20 40 60 80 100 120 140 160 180 200 220 240 260 280 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 55/200/56 2.0 Application Notes Application Notes The terminations should not be bent closer than 1.6mm from Thebody, terminations should not be bent closerbend thanradius 1.6mm the and the recommended minimum is from the body, and the recommended minimum bend radius is 1.2mm. 1.2mm. Care must be taken when determining clearance between the Care must be taken when determining clearance between the resistor body and the P.C.B. or other components. Resistance resistor body and the P.C.B. or other components. Resistance is measured 6mm from body. is measured 6mm from body. Temp Temp Packaging Packaging 10 10 The standard method of packaging is taped in ammo packs. The standard method of packaging is taped in ammo packs. Can Canbe beprovided providedon onreels reelsby byrequest. request. These Theseproducts productsare arealso alsoavailable availableininaarange rangeofoflead leadforming formingoptions. options. InInparticular, particular,ititisisavailable availableininZI-form ZI-formSMD SMDformat formatpacked packedininblister blistertape tape see seehttp://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf 66 f 1f f 2f 2 63 63 f 1f 1--f 2f 21.4 1.4mm mm 1 66 Ordering Ordering Procedure Procedure Example: Example:W31 W31atat11kilohms kilohmsand and1% 1%tolerance tolerancepacked packedininaabox boxofof1000 1000pieces pieces W W3311--11KK00FFAA11 Type Type Value(use (useIEC62 IEC62code) code) Value Tolerance(use (useIEC62 IEC62code) code) Tolerance FF GG JJ 1% 1% 2% 2% 5% 5% Packing Packing A1 A1 T1 T1 Ammo Ammo Tape Tape 1000/box 1000/box 1000/reel 1000/reel Standard Standard BI Technologies IRC Issue Welwyn D * 07.06 100 100 (c) Welwyn General NoteComponents Limited Bedlington, Northumberland NE22 7AA, UK (c)Telephone: Welwyn+44 Components Limited Bedlington, Northumberland NE22 7AA, UK (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 *without Email: info@welwyn-tt.com * Website: www.welwyn-tt.com TT Electronics reserves the 822181 right to make changes in product specification notice or liability. Telephone: +44 (0) 1670 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com All information is subject to TT Electronics' own data and is considered accurate at time of going to print. Issue D * 07.06 www.ttelectronics.com/resistors (c) TT Electronics plc 06.18