W20 WELWYN | Alldatasheet

Document overview

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Technical content

  • 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 Dimensions (mm) and Weight (g) Type L max D max f min d nom Wt.nom W2112.7 5.6 22.75 0.8 1 W21522.0 7.0 23.1 0.8 2 W2222.0 8.0 23.1 0.8 2 W2338.0 8.0 - 0.8 3.5 W2453.5 8.0 - 0.8 5 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 Commercial W21 W215 W22 W23 W24 Resistance range at 1% tolerance ohms 1R to 10K 1R to 15K 1R to 22K 1R to 60K 1R to 100K 2% tolerance ohms 0R5 to 10K 0R5 to 15K 0R5 to 22K 1R to 60K 1R to 100K 5% tolerance ohms 0R1 to 10K 0R1 to 15K 0R1 to 22K 0R15 to 60K 0R2 to 100K TCR (-55° to 200°C) pp/°C Typically: <+-75Maximum: +-200 Approved BS CECC 40-201-002StyleJB HB KB LB MB Resistance range at 1% tolerance ohms 1R to 10K 1R to 15K 1R to 20K 1R to 56K 1R to 100K 2% tolerance ohms 0R5 to 10K 0R5 to 15K 0R5 to 20K 1R to 56K 1R to 100K 5% tolerance ohms 0R1 to 10K 0R1 to 15K 0R1 to 20K 0R15 to 56K 0R2 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 Electrical Data Physical Data Issue C · 04.03 A subsidiary of TT electronics plc Welwyn Components L Df d 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 MaterialCopper clad steel wire, nickel plated and solder-coated. StrengthThe terminations meet the requirements of IEC 68.2.21. SolderabilityThe terminations meet the requirements of IEC 115-1,– Clause 4.17.3.2. LengthW23’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. 0 5 10 15 20 W21W215 W22 W24 W23 400 300 200 100 Dissipation – Watts Temperature Rise °C W20_C.qxd 28/4/03 10:19 am Page 1

© Welwyn Components LimitedBedlington, 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 Welwyn Components 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 Deratingsee 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 handlingdata available by request Performance Data Flammability All materials used in the construction of ‘W’ series resistors are inorganic and inherently non burning. b f1f2 6 6 f1 – f2 ≤ 1.4 mm 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. Type W21 W215 W22 W23 W24 Ammo pack1000 750 500 n/a n/a Reel 1000 750 700 n/a n/a Small box n/a n/a n/a 50 25 Standard Quantities Per Package 25 70 200 315 116 100 Ambient temperature °C Derating Curve % of Rated Power Type b W2163±2 W21573±2 W2273±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 be supplied preformed. Contact factory for details. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. W20_C.qxd 28/4/03 10:19 am Page 2