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| Vitreous Enamelled Wirewound Resistors IRC Wire and Film Technologies Division W20 Series * * * * * * * Rugged all-welded construction High purity ceramic substrate Impervious lead-free vitreous enamel coating High stability and high reliability Suitable for harsh environments Overload charcteristics ideal for protection circuits Lead-free, RoHS-compliant construction Specifications Part Number W21 Power rating @25C (Watts) 3.0 Resistance Range (Ohms) 1 - 10K 0.5 - 10K 0.1 - 10K W215 5.0 1 - 15K 0.5 - 15K 0.1 - 15K W22 7.0 1 - 22K 0.5 - 22K 0.1 - 22K W23 10.0 1 - 60K 1 - 60K 0.15 - 60K W24 14.0 1 - 100K 1 - 100K 0.15 - 100K Notes 1 See temperature rise graph Tolerance (%) 1 2 5 1 2 5 1 2 5 1 2 5 1 2 5 TCR (ppm/C) Typical: <+75 Maximum: +200 Limiting Element Voltage (Volts) 100 88 Thermal Impedance1 (C/watt) Typical: <+75 Maximum: +200 160 58 Typical: <+75 Maximum: +200 200 44 Typical: <+75 Maximum: +200 500 29 Typical: <+75 Maximum: +200 750 22 Application Notes The terminations should not be bent closer than 1.6mm from the body of the resistor, and the recommended bend radius is 1.2mm. Terminations are solderable to within 4mm from the resistor body. When cold, vitreous enamel has excellent insulation resistance. In common with all insulation materials, the specific resistance of the enamel decreases with increased temperatures. Therefore, resistors operated at near-maximum temperature cannot be considered as insulated and should not be used in contact with any conductive material. Care must be taken when determining clearance distance between the resistor body and printed circuit board or other components to ensure these are not overheated. Resistance is measured 6mm from the resistor body. General Note IRC reserves the right to make changes in product specification without notice or liability. All information is subject to IRC's own data and is considered accurate at time of printing. A subsidiary of TT electronics plc W20 Series Issue November 2006 (c) IRC Wire and Film Technologies Division * 736 Greenway Road Boone, North Carolina 28607-1860 Telephone: 828 264 8861 * Facsimile: 828 264 8866 * Website: www.irctt.com IRC Wire and Film Technologies Division Environmental Performance Test Load at commercial rating: 1000 Hours at room temperature Dry heat: 1000 hours at 200C Shelf life: 12 months at room temperature Short term overload Climatic Long term damp heat Temperature rapid change Resistance to solder heat Vibration and bump Noise (in a decade of frequency) Insulation resistance Dielectric withstanding voltage Operating temperature range R% R% R% R% R% R% R% R% R% V/V V C Maximum 5 2 0.03 1.0 0.5 0.05 0.5 0.25 0.25 zero >0.1G 500 min. -55 to +200 Typical 4 1 0.02 0.2 0.2 0.02 0.2 0.03 0.05 zero >0.1G 500 min. 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, and the vitreous enamel protective coating is then applied. Temperature Rise Curve p 400 W21 W215 W22 W23 W24 300 Temperature Rise (C) Terminations Copper-clad steel wire, nickel-plated and solder-coated. 200 100 Marking The resistors are legend-marked with type reference, resistance value and tolerance. 0 5 10 Dissipation (watts) 15 20 Solvent resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. General Note IRC reserves the right to make changes in product specification without notice or liability. All information is subject to IRC's own data and is considered accurate at time of printing. A subsidiary of TT electronics plc W20 Series Issue November 2006 (c) IRC Wire and Film Technologies Division * 736 Greenway Road Boone, North Carolina 28607-1860 Telephone: 828 264 8861 * Facsimile: 828 264 8866 * Website: www.irctt.com IRC Wire and Film Technologies Division Dimensions (mm) Type W21 W215 W22 W23 W24 L (max.) 12.7 22.0 22.2 38.0 53.5 D (max.) 5.6 7.0 8.0 8.0 8.0 f (min) 22.75 23.1 23.1 30* 30* od (nom.) 0.8 0.8 0.8 0.8 0.8 Weight (g) 1.0 2.0 2.0 d dia 3.5 5.0 D L f Notes 1 * W23 and W24 Series resistors are supplied loose-packed in boxes. Ordering Information Specify type, resistance, tolerance and packaging. This example is for a W21, 9000, 5%, taped and ammo-packed. All W20 Series resistors are RoHS-compliant. Sample Part No. IRC Style W20 Resistance Value (100 - First 3 significant digits plus 4th digit multiplier) Example: 100 = 1000; 1000 = 1001; 150K = 1503. (>100 - "R" is used to designate decimal) Example: 51 = 51R0, 1 = 1R00; 0.25 = R250 Tolerance F = 1%, G = 2%, J = 5% Packaging (A = ammo; R= reel; B = box) W21 9001 J A Packaging W21 and W215 resistors are taped and packaged in ammo packs; W22 resistors are on tape-and-reel; W23 and W24 resistors are loose-packed in boxes. Standard quantities per package Type Packaging Code A R B W21 W215 W22 W23 W24 Ammo pack Reel Box 1000 - 750 - 700 - 50 25 A 6 f 2 f 1 100.5 Type A f - f 1.4mm 12 W21 632 W215 732 W22 732 General Note IRC reserves the right to make changes in product specification without notice or liability. All information is subject to IRC's own data and is considered accurate at time of printing. A subsidiary of TT electronics plc W20 Series Issue November 2006 (c) IRC Wire and Film Technologies Division * 736 Greenway Road Boone, North Carolina 28607-1860 Telephone: 828 264 8861 * Facsimile: 828 264 8866 * Website: www.irctt.com |
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