W20 ETC1 | Alldatasheet

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Commercial W21 W215 W22 W23 W24 Resistance range at 1% tolerance ohms 1 to 10k 1 to 15k 1 to 22k 1 to 60k 1 to 100k 2% tolerance ohms 0.5 to 10k 0.5 to 15k 0.5 to 22k 1 to 60k 1 to 100k TCR (-55° to 200°C) pp/°C Typically: <+75 Maximum: +200 Approved BS CECC 40-201-002 Style JB HB KB LB MB Resistance range at 1% tolerance ohms 1 to 10k 1 to 15k 1 to 20k 1 to 56k 1 to 100k 2% tolerance ohms 0.5 to 10k 0.5 to 15k 0.5 to 20k 1 to 56k 1 to 100k TCR (-55° to 200°C) ppm/°C ‡5 ohms < 10 ohms: ±400 ‡10 ohms: ±200 Applicable to commercial and approved ranges Limiting element voltage volts 100 160 200 500 750 Standard values E24 preferred. Other values to special order Thermal impedance °C/watt 88 58 44 29 22 Ambient temperature range °C -55 to 200 Physical Data Dimensions (mm) & weight (g) Type L max D max f min d nom Wt.nom W21 12.7 5.6 22.75 0.8 1 W215 22.0 7.0 23.1 0.8 2 W22 22.0 8.0 23.1 0.8 2 W23 38.0 8.0 - 0.8 3.5 W24 53.5 8.0 - 0.8 5 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. TERMINATIONS Material Copper clad steel wire, nickel plated and solder-coated. 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. Length W23’s and W24’s are not supplied on tape. Minimum lead length is 30 mm. MARKING The resistors are legend marked with type reference, resistance value and tolerance. Values are marked in accordance with IEC 62. SOLVENT RESISTANCE The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, England Tel: 01670 822181 Fax: 01670 829465 Web: http://www.Welwyn-TT.co.uk Issue A 07/9 9 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. Vitreous Enamelled Wirewound Resistors W20 SERIES

  • All welded construction
  • High purity ceramic substrate
  • Impervious lead free vitreous enamel coating
  • High power dissipation for size
  • High stability and reliability
  • Suitable for harsh environments
  • Overload characteristics ideal for protection circuits LD f d dia 0 5 10 15 20 W21 W215 W22 W23W24 400 300 200 100 Dissipation – Watts Temperature Rise °C

A f1 f2 10 – 0.5 f1 – f2 ≤ 1.4 mm Performance Data CECC 40201-002 ACTUAL PERFORMANCE Requirements Maximum Typical Load at commercial rating: 1000 hrs at 25°c ∆R% 5 3.5 Load at CECC rating: 1000 hours at 25°c ∆R% 5 5 3.5 Dry heat: 1000 hours at 200°c ∆R % 521 Shelf life: 12 months at room temperature ∆R% not specified 0.03 0.02 Derating see derating curve Short term overload ∆R% 1 1.0 0.2 Climatic ∆R% 5 0.5 0.2 Climatic category ∆R% 55/200/56 Long term damp heat ∆R% 5 0.05 0.02 Temperature rapid change ∆R% 1 0.5 0.2 Resistance to solder heat ∆R% 1 0.25 0.03 Vibration and bump ∆R% 1 0.25 0.05 Noise (in decade of frequency) µv/v not specified zero zero Robustness ∆R% 1 0.4 0.05 Insulation resistance Ohms not specified >.1G ohm >.1G ohm Voltage Proof volts not specified 500 min 500 min Pulse handling 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 Vitreous Enamelled Wirewound Resistors W20 SERIES STANDARD QUANTITIES PER PACKAGE Type W21 W215 W22 W23 W24 Ammo Pack 1000 750 500 N/A N/A Reel 1000 750 700 N/A N/A Small Box N/A N/A N/A 50 25 © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, England Tel: 01670 822181 Fax: 01670 829465 Web: http://www.Welwyn-TT.co.uk Issue A 07/9 9 25 70 200 315 116 100 Ambient temperature °C Derating Curve % of Rated Power Type A W21 63±2 W215 73±2 W22 73±2 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 bbe supplied preformed. Contact factory for details. the resistor body and the printed circuit board or other components to ensure these are not over heated. Resistance is measured 6mm from body.