Cement Coated Wirewound Resistors
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Cement CementCoated Coated Wirewound WirewoundResistors Resistors Welwyn Components W30 Series Series ·W30 Values down to 10m ohms ·s Values Tolerancedown to 1% to 10m ohms ·s Tolerance Flameproof toprotection 1% ·s Flameproof Custom builtprotection to meet pulse requirements s Custom built to meet pulse requirements Electrical Data W31 Notes Power rating at 25°C watts Power rating at 70°C watts 2.5 Resistance range ohms 0R01 to 10K TCR (-55 to 155°C) 3.0 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 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. 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 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. General Note General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. A subsidiary of All electronics informationreserves is subject Welwyn’s own data and is considered accurate at time of going to print. TT theto right to make changes in product specification without notice or liability. TT electronics plc 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 www.welwyn-tt.com © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Issue D · 07.06 Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com © TT electronics plc 09. 11 99 Cement Coated Cement Coated Cement Coated Wirewound Resistors Wirewound Resistors Wirewound W30 Series W30 Series W30 Series Resistors Welwyn Components Welwyn Components Performance Data Performance Data ∆R% ∆R% ∆R% Load: 1000 hrs 3 watts @ 25°C Load:1000 1000 watts@@70°C 25°C hrs hrs 2.5 3watts 1000 hrs 2.5 Dry heat: 1000 hrs at watts 200°C@ 70°C Dry heat: 1000 hrs at 200°C Derating from room temperature Derating from room temperature Short term overload 10 x rated power for 5 seconds Short term overload 10 x rated power for 5 seconds Climatic Climatic Climatic category Climatic category Long term damp heat: 56 days Long term damp heat: 56 days Temperature rapid change Temperature rapid change Resistance to solder heat Resistance to solder heat Vibration and bump Vibration and bump Voltage proof Voltage proof Pulse handling Pulse handling Maximum imum 5.0M+ax.001Ω 5.0 + .001Ω 5.0 + .001Ω ∆R% ∆R% ∆R% 5.0++.001Ω .001Ω 5.0 5.0 + .001Ω ∆R% ∆R% ∆R% ∆R% 5.0 + .001Ω 5.0 + .001Ω 5.0 + .001Ω 5.0 + .001Ω ∆R% ∆R% ∆R% ∆R% ∆R% ∆R% ∆R% ∆R% volts volts 3.0 + .001Ω 3.0 + .001Ω 2.0 + .001Ω 2.0 + .001Ω 5.0 + .001Ω 5.0 + .001Ω 5.0 + .001Ω 5.0 + .001Ω W31 W31Series SeriesDerating DeratingCurve Curve % of Rated Power at 70 % of Rated Power at 70 130 130 120 120 110 110 100 100 9090 8080 7070 6060 5050 4040 3030 2020 1010 00 2020 4040 6060 8080 100 100120 120140 140 160 160180 180 200 200220 220240 240 260 260280 280 Typical T3.5 ypical 3.5 3.5 3.5 3.5 3.5 see derating curve see derating curve 1.0 1.0 3.5 3.5 55/200/56 55/200/56 500 min 500 min Data available by request Data available by request 1.0 1.0 1.5 1.5 2.0 2.0 2.0 2.0 Application Application Notes Notes The Theterminations terminationsshould shouldnot notbe bebent bentcloser closerthan than1.6mm 1.6mmfrom from the body, and the recommended minimum bend radius the body, and the recommended minimum bend radiusisis 1.2mm. 1.2mm. Care Caremust mustbe betaken takenwhen whendetermining determiningclearance clearancebetween betweenthe the resistor resistorbody bodyand andthe theP.C.B. P.C.B.ororother othercomponents. components.Resistance Resistance isismeasured measured6mm 6mmfrom frombody. body. Temp Temp 10 10 Packaging Packaging Thestandard standardmethod methodofofpackaging packagingisistaped tapedininammo ammopacks. packs. The Canbe beprovided providedon onreels reelsbybyrequest. request. Can W31resistors resistorscan canbe besupplied suppliedpreformed. preformed. W31 Contact factory for details. Contact factory for details. f1f1 66 f2f2 63 63 – f 1.4mm mm f 1 f1 – f2 2≤≤1.4 66 OrderingProcedure Procedure Ordering Example:W31 W31atat11kilohms kilohmsand and1% 1%tolerance tolerancepacked packedininaabox boxofof1000 1000pieces pieces Example: W 3 1 – 1 W 3 1 – 1 KK00FFAA11 Type Type Value (use IEC62 code) Value (use IEC62 code) Tolerance (use IEC62 code) Tolerance F 1% (use IEC62 code) FG 1% 2% GJ 2% 5% J 5% Packing Packing A1 Ammo A1 T1 T1 Ammo Tape Tape 1000/box 1000/box 1000/reel 1000/reel Standard Standard © Welwyn General NoteComponents Limited Bedlington, Northumberland NE22 7AA, UK (0) 1670 822181 · Facsimile: +44 1670 829465 · Email: info@welwyn-tt.com © Welwyn Components Bedlington, Northumberland NE22 7AA, UKor liability. · Website: www.welwyn-tt.com TTTelephone: electronics+44 reserves the right toLimited make changes in (0) product specification without notice Issue D · 07.06 Issue D · 07.06 Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com 100 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 www.welwyn-tt.com 100 © TT electronics plc 09. 11
