Resistors Make Possible Cement Coated Cement Coated Welwyn Components Wirewound Resistors Wirewound Resistors W30 Series W30 Series Values down to 10m ohms TVolerancealues down t to o 10m ohms1% Tolerance to 1% Flameproof protection Flameproof protection Custom built to meet pulse requirements Custom built to meet pulse requirements All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2) Electrical Data W31 Notes Power rating at 25C watts 3.0 Power rating at 70C watts 2.5 Resistance range ohms 0R01 to 10K TCR (-55 to 155C) ppm/C See below Resistance tolerance % <R10: 5 >=R10: 1, 2, 5 Standard values E24 series preferred Other values to special order Thermal impedance C/watt 83 Ambient temperature range C -55 to 155 Limiting element voltage volts 100 TCR ppm/C 0.01 ohms <1000 0.033 ohms <500 0.091 ohms <200 10 ohms <150 10K ohms <100 Physical Data Maximum Dimensions (mm) and Weight (g) Type L max. D max. f min. d nom. Wt.nom. d D L W31 13 5.6 (note 1) 22.75 0.8 1.0 f < Note 1: 5.8 for values 0R1 Construction Marking A high quality ceramic substrate is assembled with W31 resistors are legend marked with type reference, interference fit end caps to which are welded the element 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 The body and marking are resistant to all normal industrial Terminations cleaning solvents suitable for printed circuits. Material Solder coated copper. Strength The terminations meet the requirements of Flammability IEC 68.2.21. The resistor coating will not burn under any condition of Solderability The terminations meet the requirements of applied temperature or component overload. IEC 115-1, Clause 4.17.3.2. General Note General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. TT Electronics reservAll information is subjectes the right to mak to Welwyne changes in product specifics own data and is consideation without notice or liability.red accurate at time of going to print. A subsidiary of TT electronics plc All information is subject to TT Electronics own data and is considered accurate at time of going to print. www.ttelectronicsresistors.com 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 07.06 TT Electronics plc 07.14 99Cement Coated Cement Coated WirCement Coatedewound Resistors Make Possible Wirewound Resistors Wirewound Resistors W30 Series Welwyn Components W30 Series Welwyn Components W30 Series Performance Data Performance Data aM xi T py ical aM xi T py ical Load: 1000 hrs 3 watts 25C R% 5.0 + .001 3.5 Load: 1000 hrs 3 watts 25C R% 5.0 + .001 3.5 1000 hrs 2.5 watts 70C R% 5.0 + .001 3.5 1000 hrs 2.5 watts 70C R% 5.0 + .001 3.5 Dry heat: 1000 hrs at 200C R% 5.0 + .001 3.5 Dry heat: 1000 hrs at 200C R% 5.0 + .001 3.5 D ing fro mroo m et mp ure see d in g curve D ing fro mroo m et mp ure see d in g curve Short term overload 10 x rated power for 5 seconds R% 5.0 + .001 1.0 Short term overload 10 x rated power for 5 seconds R% 5.0 + .001 1.0 Climatic R% 5.0 + .001 3.5 Climatic R% 5.0 + .001 3.5 Climatic category 55/200/56 Climatic category 55/200/56 Long term damp heat: 56 days R% 3.0 + .001 1.0 Long term damp heat: 56 days R% 3.0 + .001 1.0 Temperature rapid change R% 2.0 + .001 1.5 Temperature rapid change R% 2.0 + .001 1.5 Resistance to solder heat R% 5.0 + .001 2.0 Resistance to solder heat R% 5.0 + .001 2.0 Vibration and bump R% 5.0 + .001 2.0 Vibration and bump R% 5.0 + .001 2.0 oV ltag e pr oo f ov lts min oV ltag e pr oo f ov lts min Pulse handling Data available by request Pulse handling Data available by request W31 Series Derating Curve W31 Series Derating Curve 130 130 Application Notes 120 120 Application Notes 110 110 100 The terminations should not be bent closer than 1.6mm from 100 The terminations should not be bent closer than 1.6mm from 90 90 the body, and the recommended minimum bend radius is the body, and the recommended minimum bend radius is 80 80 1.2mm. 70 1.2mm. 70 60 60 50 50 Care must be taken when determining clearance between the Care must be taken when determining clearance between the 40 40 resistor body and the P.C.B. or other components. Resistance 30 resistor body and the P.C.B. or other components. Resistance 30 20 20 is measured 6mm from body. is measured 6mm from body. 10 10 0 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 20 40 60 80 100 120 140 160 180 200 220 240 260 280 TempTemp 1010 PackagingPackaging The standard method of packaging is taped in ammo packs. The standard method of packaging is taped in ammo packs. Can be provided on reels by request. Can be provided on reels by request. f f 1 2 f f W31 resistors can be supplied preformed. 1 2 W31 resistors can be supplied preformed. 63 6 6 Contact factory for details. 6 63 6 Contact factory for details. f f 1.4 mm 1 2 f f 1.4 mm 1 2 Ordering Procedure Ordering Procedure Example: W31 at 1 kilohms and 1% tolerance packed in a box of 1000 pieces Example: W31 at 1 kilohms and 1% tolerance packed in a box of 1000 pieces W 3 1 1 K 0 F A 1 W 3 1 1 K 0 F A 1 Type Type Value (use IEC62 code) Value (use IEC62 code) Tolerance (use IEC62 code) Tolerance (use IEC62 code) F 1% F 1% G 2% G 2% J 5% J 5% Packing Packing A1 Ammo 1000/box Standard A1 Ammo 1000/box Standard T1 Tape 1000/reel T1 Tape 1000/reel Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK General Note Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue D 07.06 WTT Electronics reservelwyn Components Limitedes the right to make changes in product specificBedlington, Northumberland NE22 7AA, UKation 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 D 07.06 All information is subject to TT Electronics own data and is considered accurate at time of going to print. 100 www.ttelectronicsresistors.com 100 TT Electronics plc 07.14 % of Rated Power at 70 % of Rated Power at 70 005 005 tare tare tare tare tare tare mum mum