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Cement Coated Wirewound Resistors
W30 Series
Welwyn Components
* Values down to 10m ohms * Tolerance to 1% * Flameproof protection * Custom built to meet pulse requirements
Electrical Data
W31 Power rating at 25C Power rating at 70C Resistance range TCR (-55 to 155C) Resistance tolerance Standard values Thermal impedance Ambient temperature range Limiting element voltage TCR C/watt C volts ppm/C watts watts ohms ppm/C % 3.0 2.5 0R01 to 10K See below 521 E24 series preferred 83 -55 to 155 100 0.01 ohms <1000 0.033 ohms <500 0.091 ohms <200 10 ohms <150 10K ohms <100 Other values to special order Notes
Physical Data
Maximum Dimensions (mm) and Weight (g) Type W31 L max. 13 D max. 5.6 f min. 22.75 d nom. 0.8 Wt.nom. 1.0
d D L f
Construction
A high quality ceramic substrate is assembled with interference fit end caps to which are welded the element winding and termination wires. The protection is then applied to the body, providing an effective seal which is impervious to moisture, shock, vibration, fungus and salt spray.
Marking
W31 resistors are legend marked with type reference, resistance value and tolerance. Values are marked in accordance with IEC 62.
Solvent Resistance
The body and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits.
Terminations
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
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 * 07.06
(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
99
Cement Coated Wirewound Resistors
W30 Series
Welwyn Components
Performance Data
Maximum Load: 1000 hrs 3 watts @ 25C 1000 hrs 2.5 watts @ 70C Dry heat: 1000 hrs at 200C Derating from room temperature Short term overload 10 x rated power for 5 seconds Climatic Climatic category Long term damp heat: 56 days Temperature rapid change Resistance to solder heat Vibration and bump Voltage proof Pulse handling R% R% R% R% volts 3.0 + .001 2.0 + .001 5.0 + .001 5.0 + .001 500 min Data available by request R% R% 5.0 + .001 5.0 + .001 55/200/56 1.0 1.5 2.0 2.0 R% R% R% 5.0 + .001 5.0 + .001 5.0 + .001 see derating curve 1.0 3.5 Typical 3.5 3.5 3.5
W31 Series Derating Curve
130 120 110 100 90 80 70 60 50 40 30 20 10 0 20
% of Rated Power at 70
40
60
80 100 120 140 160 180 200 220 240 260 280
Temp
Application Notes
The terminations should not be bent closer than 1.6mm from the body, and the recommended minimum bend radius is 1.2mm. 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. 10
f1 6 63
f2 6 f1 - f2 1.4 mm
Packaging
The standard method of packaging is taped in ammo packs. Can be provided on reels by request. W31 resistors can be supplied preformed. Contact factory for details.
Type Ammo pack Reel
Standard Quantities Per Package
W31 1000 1000
(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 100
Issue D * 07.06

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