 |
|
| 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: |
| Aluminium Housed Wirewound Resistors WH Series Welwyn Components * High power dissipation for size * All welded construction * Suitable for severe environments * Designed for excellent thermal conductivity to heatsink Electrical Data WH5 Power rating at 25C Resistance range TCR (-55 to 200C) Resistance tolerance Low value limits watts ohms ppm/C % ohms 1 at 1% AA 10 0.05 to 3.4k 10 0R01 to 10K <10 : 75 WH10 15 0R01 to 20K to <100 : 50 1, 2, 5, 10 0.5 at 2% BA 15 0.05 to 15k 5 10 100 1, 2, 5 1 at 1% 150 16.0 250 10.0 -55 to 200 0.5 at 2% 0.05 at 5% 500 6.0 1250 Other values to special order 3.5 Mounted on standard heatsink WH50 0.015 at 10% 0.05 at 5% CA 25 0.05 to 33k >10 50 0.01 at 10% DA 40 0.05 to 82k Mounted on standard heatsink WH50 0.015 at 10% WH25 25 0R01 to 44K 100 : 25 WH50 50* 0R015 to 120K Notes Mounted on standard heatsink Approved CECC 40203 - 006 Power rating at 25C Resistance range TCR (-55 to 200C) Resistance tolerance Low value limits Limiting element voltage Standard values Thermal impedance C/watt C Ambient temperature range watts ohms ppm/C % ohms volts E24 preferred range *For load at maximum rating mount on heatsink 30.5 cm x 30.5 cm x 1.5 mm Construction Cap and lead assemblies are fitted to a high purity ceramic substrate. The resistive element is wound onto the substrate and welded to the caps. The wound rod is then moulded and fitted into an aluminium housing to give optimum stability and reliability. Marking The resistors are legend marked with type reference, resistance value and tolerance which will withstand all accepted industrial cleaning fluids. Values are marked in accordance with IEC 62. Terminations Material Strength Solderability Solder dipped, copper clad steel wire. The terminations meet the requirements of IEC 68.2.21 The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2 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 * 03.06 (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 107 Aluminium Housed Wirewound Resistors WH Series Welwyn Components Physical Data Dimensions (mm) Type WH5 WH10 WH25 WH50 Type WH5 WH10 WH25 WH50 A Max 30.0 36.5 51.0 72.5 G Max 9 11 15 16 B 0.3 12.4 15.9 19.8 21.4 H Dia 0.2 2.4 2.4 3.3 3.3 C 0.3 11.3 14.3 18.3 39.7 L Max 17.0 21.0 29.0 51.0 E Min 1.9 1.9 2.8 2.8 M 0.5 4.3 5.2 7.2 7.9 F Max 17 21 28 30 N Max 1.8 2.2 2.6 2.6 Performance Data CECC 40203-006 Load at commercial rating: 1000 hrs at 25C Load at CECC rating: 1000 hours at 25C Dry heat: 1000 hours at 200C Derating from 25C Short term overload Climatic sequence Climatic category Long term damp heat Temperature rapid change Resistance to solder heat Vibration and bump Noise (in decade of frequency) Insulation resistance. Isolation voltage : WH5 and 10 : WH25 and 50 Pulse handling R % R % R % R % V/V ohms volts AC peak volts AC peak R % R % R % R % R % 1.0 1.0 1.0 Zero at 200C 1.0 1.0 55/200/56 1.0 0.25 0.25 0.25 Not specified >1Gohm 1000 min 2000 min 0.5 0.25 0.25 0.25 zero >20Tohm 1500 min 3000 min Data available by request 0.2 0.1 0.05 0-.025 zero >100Gohm See application notes 1.0 1.0 0.2 0.4 1.0 1.0 1.0 Actual Maximum Typical 0.4 0.4 0.4 Notes (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 108 Issue D * 03.06 Aluminium Housed Wirewound Resistors WH Series Welwyn Components Application Notes Reference aluminium heatsink dimension CECC 40203-006 AA (WH5) BA (WH10) CA (WH25) DA (WH50) L cm 15.5 18 W cm 10 13 H cm 5 5 Reference area sq. cm Maximum Dissipation (Watts) Graph 1 50 CECC 40 STYLE 410 544 40 5C T2 544cm2 NA 0C T7 S DI NA TIO ED A T SIP RA 25C DIS ED RAT 70C IO AT SIP 25C 70C 25C 70C DA 30 Aluminium thickness 1mm CA 20 BA AA Reference chassis 10 410cm 2 5 10 50 100 500 1000 Heatsink Surface Area (cm2) H L W WH50 only To load at maximum commercial rating (50W) mount on heatsink 30.5cm x 30.5cm x 1.5mm. Derating must be applied when resistors are mounted on a heat sink of smaller dimensions than defined in Graph 1. It is recommended that the resistor base should be coated with heatsink compound before mounting to obtain the stated operating characteristics. The heatsink compound increases thermal conductivity to the heatsink. After soldering care should be taken to ensure that there are no flux residues on the moulding compound, otherwise insulation resistance will be reduced. Packaging Resistors are packed in plastic bags and boxed for maximum protection. (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 D * 03.06 109 |
Price & Availability of WH25
 |
|
|
|
|
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] |