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 W215 W22 W23 W24 Power rating @25C (Watts) 3.0 5.0 7.0 10.0 14.0 Resistance Range (Ohms) Tolerance (%) 1 - 10K 1 0.5 - 10K 2 0.1 - 10K 5 1 - 15K 1 0.5 - 15K 2 0.1 - 15K 5 1 - 22K 1 0.5 - 22K 2 0.1 - 22K 5 1 - 60K 1 1 - 60K 2 0.15 - 60K 5 1 - 100K 1 1 - 100K 2 0.15 - 100K 5 TCR (ppm/C) Limiting Element Voltage (Volts) Thermal Impedance1 (C/watt) Typical: <+75 Maximum: +200 100 88 Typical: <+75 Maximum: +200 160 58 Typical: <+75 Maximum: +200 200 44 Typical: <+75 Maximum: +200 500 29 Typical: <+75 Maximum: +200 750 22 Notes 1 See temperature rise graph 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. (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 bn802 W20 Series Datasheet_2.ind1 1 A subsidiary of TT electronics plc W20 Series Issue November 2006 11/17/06 4:40:29 PM IRC Wire and Film Technologies Division Environmental Performance Test Maximum Typical Load at commercial rating: 1000 Hours at room temperature R% 5 4 Dry heat: 1000 hours at 200C R% 2 1 Shelf life: 12 months at room temperature R% 0.03 0.02 Short term overload R% 1.0 0.2 Climatic R% 0.5 0.2 Long term damp heat R% 0.05 0.02 Temperature rapid change R% 0.5 0.2 Resistance to solder heat R% 0.25 0.03 Vibration and bump R% 0.25 0.05 Noise (in a decade of frequency) V/V zero zero >0.1G >0.1G 500 min. Insulation resistance Dielectric withstanding voltage V 500 min. Operating temperature range C -55 to +200 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. Terminations Copper-clad steel wire, nickel-plated and solder-coated. Temperature Rise Curve p 400 W21 W215 W22 W23 W24 300 Temperature Rise (C) Construction 200 100 Marking The resistors are legend-marked with type reference, resistance value and tolerance. 0 5 10 15 20 Dissipation (watts) 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. (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 bn802 W20 Series Datasheet_2.ind2 2 A subsidiary of TT electronics plc W20 Series Issue November 2006 11/17/06 4:40:30 PM IRC Wire and Film Technologies Division Dimensions (mm) Type L (max.) D (max.) f (min) od (nom.) Weight (g) W21 12.7 5.6 22.75 0.8 1.0 W215 22.0 7.0 23.1 0.8 2.0 W22 22.2 8.0 23.1 0.8 2.0 W23 38.0 8.0 30* 0.8 3.5 W24 53.5 8.0 30* 0.8 5.0 d dia D L f Notes 1 * W23 and W24 Series resistors are supplied loose-packed in boxes. Ordering Information Packaging Specify type, resistance, tolerance and packaging. This example is for a W21, 9000, 5%, taped and ammo-packed. 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. All W20 Series resistors are RoHS-compliant. Standard quantities per package Sample Part No. W21 9001 J A Type Packaging Code W21 W215 W22 W23 W24 Ammo pack A 1000 750 - - - Reel R - - 700 - - Box B - - - 50 25 IRC Style W20 Resistance Value (1007 - First 3 significant digits plus 4th digit multiplier) Example: 1007 = 1000; 10007 = 1001; 150K7 = 1503. (>1007 - "R" is used to designate decimal) Example: 517 = 51R0, 17 = 1R00; 0.257 = R250 A f 6 f 1 2 100.5 Tolerance F = 1%, G = 2%, J = 5% Type Packaging (A = ammo; R= reel; B = box) f - f 1.4mm 1 2 A 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. (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 bn802 W20 Series Datasheet_2.ind3 3 A subsidiary of TT electronics plc W20 Series Issue November 2006 11/17/06 4:40:30 PM