W30 WELWYN | Alldatasheet
Document overview
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- PDF pages: 2
Technical content
- Values down to 10m ohms
- Tolerance to 1%
- Flameproof protection
- Custom built to meet pulse requirements Maximum Dimensions (mm) and Weight (g) W31 13 5.6 22.75 0.8 1.0 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. © 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 W31 Notes Power rating at 25°C watts 3.0 Power rating at 70°C watts 2.5 Resistance range ohms 0R01 to 10K TCR (-55 to 155°C) ppm/°C See below Resistance tolerance % 5 2 1 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 Electrical Data Physical Data Issue D · 07.06 A subsidiary of TT electronics plc Welwyn Components LD f d 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. Terminations Material Solder coated copper. Strength The terminations meet the requirements of IEC 68.2.21. Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2. 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. Flammability The resistor coating will not burn under any condition of applied temperature or component overload.
f1 –f 2 ≤ 1.4 mm Cement Coated Wirewound Resistors W30 Series © 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 Welwyn Components Maximum Typical Load: 1000 hrs 3 watts @ 25°C ∆R% 5.0 + .001 Ω 3.5 1000 hrs 2.5 watts @ 70°C ∆R% 5.0 + .001 Ω 3.5 Dry heat: 1000 hrs at 200°C ∆R% 5.0 + .001 Ω 3.5 Derating from room temperature see derating curve Short term overload 10 x rated power for 5 seconds ∆R% 5.0 + .001 Ω 1.0 Climatic ∆R% 5.0 + .001 Ω 3.5 Climatic category 55/200/56 Long term damp heat: 56 days ∆R% 3.0 + .001 Ω 1.0 Temperature rapid change ∆R% 2.0 + .001 Ω 1.5 Resistance to solder heat ∆R% 5.0 + .001 Ω 2.0 Vibration and bump ∆R% 5.0 + .001 Ω 2.0 Voltage proof volts 500 min Pulse handling Data available by request Performance Data 20 40 60 80 100 120 140 160 180 200 220 240 260 280 130 120 110 100 Temp W31 Series Derating Curve % of Rated Power at 70 Type W31 Ammo pack 1000 Reel 1000 Standard Quantities Per Package 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. 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.