 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| Vitreous Enamelled Wirewound Resistors W20 Series Welwyn Components * CECC approved * Suitable for harsh environments * Impervious lead free vitreous enamel coating * Overload characteristics ideal for protection circuits * * High stability and reliability High power dissipation for size Electrical Data Commercial Power rating at 25C Resistance range at 1% tolerance 2% tolerance 5% tolerance TCR (-55 to 200C) Approved BS CECC 40-201-002 Power rating at 25C Power rating at 70C Resistance range at 1% tolerance 2% tolerance 5% tolerance TCR (-55 to 200C) Applicable to commercial and approved ranges Limiting element voltage Standard values Thermal impedance Ambient temperature range watts ohms ohms ohms pp/C Style watts watts ohms ohms ohms ppm/C W21 3.0 1R to 10K 0R5 to 10K 0R1 to 10K W215 W22 W23 W24 5.0 7.0 10.0 14.0 1R to 15K 1R to 22K 1R to 60K 1R to 100K 0R5 to 15K 0R5 to 22K 1R to 60K 1R to 100K 0R1 to 15K 0R1 to 22K 0R15 to 60K 0R2 to 100K Typically: <+-75 Maximum: +-200 JB HB KB LB MB 2.9 5.0 7.0 10.0 14.0 2.5 4.3 6.0 9.0 12.0 1R to 10K 1R to 15K 1R to 20K 1R to 56K 1R to 100K 0R5 to 10K 0R5 to 15K 0R5 to 20K 1R to 56K 1R to 100K 0R1 to 10K 0R1 to 15K 0R1 to 20K 0R15 to 56K 0R2 to 100K 5 ohms < 10 ohms: 400 10 ohms: 200 volts C/watt C 100 88 160 200 500 E24 preferred. Other values to special order 58 44 29 -55 to 200 750 22 Physical Data Dimensions Type W21 W215 W22 W23 W24 400 (mm) and Weight (g) L max D max 12.7 5.6 22.0 7.0 22.0 8.0 38.0 8.0 53.5 8.0 W215 W22 W23 W24 f min 22.75 23.1 23.1 - d nom 0.8 0.8 0.8 0.8 0.8 Wt.nom 1 2 2 3.5 5 d D L f Temperature Rise C W21 Construction A high purity ceramic substrate is assembled with interference fit end caps to which are welded the termination wires. The resistive element is wound on the substrate and welded to the caps; the vitreous enamel protective coating is then applied. 300 200 Terminations Material Strength Solderability Length 100 Copper clad steel wire, nickel plated and solder-coated. The terminations meet the requirements of IEC 68.2.21. The terminations meet the requirements of IEC 115-1,- Clause 4.17.3.2. W23's and W24's are not supplied on tape. Minimum lead length is 30 mm. 0 0 5 10 15 20 Marking Dissipation - Watts The resistors are legend marked with type reference, resistance value and tolerance. Values are marked in accordance with IEC 62. 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 C * 04.03 (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 85 Vitreous Enamelled Wirewound Resistors W20 Series Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. Welwyn Components Flammability All materials used in the construction of `W' series resistors are inorganic and inherently non burning. Performance Data CECC 40201-002 Requirements Load at commercial rating: 1000 hrs at 25c Load at CECC rating: 1000 hours at 25c Dry heat: 1000 hours at 200c Shelf life: 12 months at room temperature Derating Short term overload Climatic Climatic category Long term damp heat Temperature rapid change Resistance to solder heat Vibration and bump Noise (in decade of frequency) Robustness Insulation resistance Voltage Proof Pulse handling R% R% R% R% R% R% R% R% R% R% R% v/v R% ohms volts 5 5 not specified 1 5 55/200/56 5 1 1 1 not specified 1 not specified not specified Actual Performance Maximum Typical 5 3.5 5 3.5 2 1 0.03 0.02 see derating curve 1.0 0.2 0.5 0.2 0.05 0.02 0.5 0.2 0.25 0.03 0.25 0.05 zero zero 0.4 0.05 >.1G ohm >.1G ohm 500 min 500 min data available by request Application Notes The termination should not be bent closer than 1.6mm from the body, and the recommended minimum bend radius is 1.2mm. The terminations are solderable to within 4mm from the body. When cold, vitreous enamel has excellent insulation resistance. In common with all insulants the specific resistance of the enamel decreases with increase in temperature. Therefore, resistors operated at near maximum temperature cannot be classed as insulated and should not be used in contact with any conducting material. Care must be taken when determining clearance distance between the resistor body and the printed circuit board or other components to ensure these are not over heated. Resistance is measured 6mm from body. 116 Packaging For W21 and W215 the standard method of packaging is taped in Ammo Packs. For W22 the standard method of packaging is taped and reeled. Alternatives available by special request are detailed in the table below. W23's and W24's are available only as loose packed in boxes. W series resistors can be supplied preformed. Contact factory for details. 10 f1 6 Derating Curve f2 b f1 - f2 1.4 mm 6 % of Rated Power 100 Standard Quantities Per Package 54 Type Ammo pack Reel Small box 25 70 200 315 W21 1000 1000 n/a b 632 732 732 W215 750 750 n/a W22 500 700 n/a W23 n/a n/a 50 W24 n/a n/a 25 0 Ambient temperature C Type W21 W215 W22 (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 Issue C * 04.03 86 |
Price & Availability of W22
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |