Vitreous VitreousEnamelled Enamelled Wirewound WirewoundResistors Resistors Welwyn Components W20 Series W20 Series CECC approved s CECC approved Suitable for harsh environments Suitable for harsh environments s Impervious lead free vitreous enamel coating Impervious lead free vitreous enamel coating s Overload characteristics ideal for protection circuits Overload characteristics ideal s High stability and reliability for protection circuits for size High power dissipation s High stability and reliability * * * * * * s 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) watts ohms ohms ohms pp/C BS CECC 40-201-002 Requirements Power rating at 25C Power rating at 70C Resistance range at 1% tolerance 2% tolerance 5% tolerance TCR (-55 to 200C) 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 10.5 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 10.5 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 This table indicates the CECC specification requirements, and these are met or exceeded by the corresponding W20 series products Applicable to commercial and approved ranges Limiting element voltage Standard values Thermal impedance Ambient temperature range volts 100 C/watt C 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 (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 8.0 400 W215 C W21 W24 W22 300 Temperature Rise W23 d nom 0.8 0.8 0.8 0.8 0.8 Wt.nom 1 2 2 3.5 5 d D L f 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 200 Material Strength Solderability Length 100 0 f min 22.75 23.1 23.1 - 0 5 10 15 20 Dissipation - Watts 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. Marking The resistors are legend marked with type reference, resistance value and tolerance. Values are marked in accordance with IEC 62. General Note Note General Welwyn Components reserves right changes to make in changes product specification without notice or liability. TT electronics reserves the right the to make productinspecification without notice or liability. All information is subject to Welwyn's own data and is considered accurate at time of going to print. All information is subject to TT electronics' own data and is considered accurate at time of going to print. A subsidiary of TT electronics plc www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) Welwyn Components Limited * Bedlington, Northumberland NE22 7AA, UK (c) TT electronics plc822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com Telephone: +44 (0) 1670 09. 11 Wirewound Resistors Welwyn Components W20 SeriesEnamelled Vitreous Wirewound Resistors Flammability Solvent Resistance W20 Series All materials used in the construction of `W' series resistors are inorganic and inherently non burning. The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. 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% 5 5 not specified R% R% R% R% R% R% R% v/v R% ohms volts 1 5 55/200/56 5 1 1 1 not specified 1 not specified not specified Application Notes 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 Packaging 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. 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 % of Rated Power 116 f2 b f1 - f2 1.4 mm 6 100 54 0 25 70 200 315 Ambient temperature C Type b W21 632 W215 732 W22 732 (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 General Note TT electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT electronics' own data and is considered accurate at time of going to print. www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) TT electronics plc 09. 11 Vitreous Enamelled Vitreous Enamelled Wirewound Resistors Wirewound Resistors Welwyn Components W20 Series W20 Series Ordering Procedure Example: W22 at 3.3 kilohms and 5% tolerance on a reel of 700 pieces - W22-3K3JI Type Value (use IEC62 code) Tolerance (use IEC62 code) F G 1% 2% Packing I J Ammo Tape Bulk 5% W21, W215 W22 W23, W24 1000/box 700/reel 50/box Standard For CECC released product state on order the CECC number and style. Example: W22-3K3JI CECC40201-002 KB For SnPb finish instead of Pb-free replace the packing suffix with PB. Example: W22-3K3JPB General Note TT electronics reserves the right to make changes in product specification without notice or liability. (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK All information subject TT electronics' own+44 data is considered accurate at time of going to* print. 07.11 Telephone: +44is(0) 1670to 822181 * Facsimile: (0)and 1670 829465 * Email: info@welwyn-tt.com Website: www.welwyn-tt.com www.bitechnologies.com www.irctt.com www.welwyn-tt.com 86 (c) TT electronics plc 09. 11