Resistors Vitreous Enamelled Vitreous EnamelledResistors Wirewound Welwyn Components Wirewound Resistors W20 Series W20 Seriesapproved * CECC Suitable for harsh environments * CECC approved Impervious leadenvironments free vitreous enamel coating * Suitable for harsh Overload characteristics lead free vitreousideal enamel coating * Impervious for protection circuits Overload characteristics ideal for protection circuits andand reliability Highstability stability reliability * High * High power dissipation for size High power dissipation for size All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3) Electrical Data Commercial Power rating at 25C Resistance range at 1% tolerance 2% tolerance 5% tolerance TCR (-55 to 200C) watts ohms ohms ohms ppm/ 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 Temperature Rise C 400 W215 W21 W23 Wt.nom 1 2 2 3.5 5 d D L f 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 d nom 0.8 0.8 0.8 0.8 0.8 Construction W24 W22 300 f min 22.75 23.1 23.1 - 0 5 10 15 Dissipation - Watts GeneralNote Note General 20 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. Welwyn Components reserves right to make changes in productwithout specification notice or liability. TT Electronics reserves the right tothe make changes in product specification notice without 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. BI Technologies IRC Welwyn (c) Welwyn Components Limited * Bedlington, Northumberland NE22 7AA, UK (c) TT Electronics Telephone: +44 (0) plc 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com A subsidiary of TT electronics plc www.ttelectronics.com/resistors 10.19 t OM| Ke nC= = OULQLMP= = NMWNV=~a = = m~OE=O Vitreous Enamelled Wirewound Resistors Vitreous Enamelled W20 Series Wirewound Resistors Welwyn Components W20 Series Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits Solvent Resistance Flammability The body protection and marking are resistant to all normal Flammability All materials used in the construction of `W' series resistors inorganic and inherently non burning. industrial solvents suitable forseries printed circuits. All materialscleaning used in the construction of W20 resistors are inorganic and are inherently non-burning. Performance Data CECC 40201-002 Requirements 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 Load at commercial rating: 1000 hrs at 25C R% Load at CECC rating: 1000 hours at 25C R% 5 Dry heat: 1000 hours at 200C R% 5 Shelf life: 12 months at room temperature R% not specified Derating Short term overload R% 1 Climatic R% 5 Climatic category R% 55/200/56 R% 5 0.05 0.02 Long term damp heat Temperature rapid change R% 1 0.5 0.2 Resistance to solder heat R% 1 0.25 0.03 R% 1 0.25 0.05 Vibration and bump Noise (in decade of frequency) v/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 Data available at: https://www.ttelectronics.com/TTElectronics/media/ProductFiles/Resistors/ApplicationNotes/Wirewound-Pulse-Overload-Resistors.pdf Application Notes 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. W23's and W24's are available only as loose packed in boxes. 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 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. BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc (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 10.19 Vitreous Enamelled Vitreous Enamelled Wirewound Resistors Wirewound Resistors Welwyn Components W20 Series W20 Series Ordering Procedure Ordering Procedure This product has two valid part numbers: Example: W22 at 3.3 kilohms and 5% tolerance on a reel of 700 pieces - Example: W22-3K3JI (W22, 3.3 kilohms 5%, Pb-free) W 2 Type 2 - 3 K 1 3 2 1 2 Value (use IEC62 code) Type Value 1%W215 J 2%W22 R = ohms 5% K = kilohms W23 W24 Packing Ammo Tape Bulk I 3 4 W22-3K3JI 3 4 Tolerance Packing & Termination Finish W21 (use E24 =IEC62 3/4 characters Tolerance code) F G J F = 1% G = 2% J = 5% W21, W215 W22 W23, W24 I = Standard packing & Pb-free PB = Standard packing & SnPb W21, W215 1000/box W22 700/reel W23, W24 50/box 1000/box 700/reel 50/box For CECC released product state on order the CECC number and style. Example: W22-3K3JI CECC40201-002 KB I Standard For CECC released product state on order the 3.3 CECC number and style. Example: W22-3K3JI CECC40201-002 KB USA (IRC) Part Number: W22-3301JLF (W22, kilohms 5%, Pb-free) For SnPb finish instead of Pb-free replace the packing suffix with PB. Example: W22-3K3JPB W 2 2 - 3 3 1 0 2 1 2 Type Value 1 J 3 W21 3 digits + multiplier W215 R = ohms for values <100 ohms W22 W23 W24 L F 4 3 4 Tolerance Packing & Termination Finish F = 1% G = 2% J = 5% LF = Standard packing & Pb- free Omit for Standard packing & SnPb W21, W215 1000/box W22 700/reel W23, W24 50/box General Note BI Technologies IRC Welwyn 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. Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK 86 07.11 www.ttelectronics.com/resistors (c) TT Electronics plc 10.19