Vitreous Enamelled Wirewound Resistors W20 Series • • • • • • • High stability and reliability High purity ceramic substrate High power dissipation for size Suitable for harsh environments Rugged all-welded construction Impervious lead free vitreous enamel coating Overload characteristics ideal for protection circuits Electrical Data IRC Type W21 W215 W22 W23 W24 Power Rating @ 25°C (watts) 3.0 5.0 7.0 10.0 14.0 Resistance Range (ohms) Tolerance (±%) TCR (-55°C to 200°C) (±ppm/°C) 1 - 10K 1 0.5 - 10K 2 Typical: <+75 Maximum: +200 0.1 - 10K 5 1 - 15K 1 0.5 - 15K 2 0.1 - 15K 5 1 - 20K 1 0.5 - 20K 2 0.1 - 20K 5 1 - 60K 1 1 - 60K 2 0.15 - 60K 5 1 - 100K 1 1 - 100K 2 0.2 - 100K 5 Typical: <+75 Maximum: +200 Typical: <+75 Maximum: +200 Typical: <+75 Maximum: +200 Typical: <+75 Maximum: +200 Limiting Element Voltage (volts) Thermal Impedance* (°C/watt) Operating Temperature Range (°C) 100 88 -55 to 350 160 58 -55 to 350 200 44 -55 to 350 500 29 -55 to 350 750 22 -55 to 350 *See temperature rise graph 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 going to print. Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com A subsidiary of TT electronics plc W20 Series Issue December 2008 Sheet 1 of 4 Vitreous Enamelled Wirewound Resistors Physical Data d dia. D f L Dimensions (mm) and Weight (g) L max D max f min d nom Wt. nom W21 12.7 5.6 22.75 0.8 1 W215 22.0 7.0 23.1 0.8 2 W22 22.2 8.0 23.1 0.8 2 W23 38.0 8.0 --- 0.8 3.5 W24 53.5 8.0 --- 0.8 5 IRC Type 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 Material: Copper clad steel wire, nickel plated and solder-coated. Length: W23’s and W24’s are not supplied on tape. Minimum length is 30mm. MARKING The resistors are legend marked with type reference, resistance value and tolerance. SOLVENT RESISTANCE The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com W20 Series Issue December 2008 Sheet 2 of 4 Vitreous Enamelled Wirewound Resistors Temperature Rise Curve 400 Temperature Rise (°C) W22 W215 W22 W23 W24 300 200 100 0 5 10 15 Dissipation (watts) 20 Environmental Data Actual Performance Test Maximum Typical Load at Commercial Rating: 1000 Hours @ room temperature ∆R% 5 3.5 Dry Heat: 1000 hours @ 200°C ∆R% 2 1 Shelf Life: 12 months at room temperature ∆R% 0.03 0.02 Short Term Overload ∆R% .47 0.1 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) µV/V zero zero Robustness ∆R% 0.4 0.05 Insulation Resistance ohms >1 G ohm >1 G ohm Voltage Proof volts 500 min 500 min APPLICATION NOTES The terminations should not be bent closer than 1.6mm from the body, and the recommended minimum bend radius is 1.2 mm. Terminations are solderable to within 4mm from the body. When cold, vitreous enamel has excellent insulation resistance. In common with all insulations 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 printed circuit board or other components to ensure these are not overheated. Resistance is measured 6mm from the resistor body. Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com W20 Series Issue December 2008 Sheet 3 of 4 Vitreous Enamelled Wirewound Resistors Packaging For W21, W215, and W22 resistors the standard method of packaging is taped in ammo packs. Alternatives available by special request are: - Taped and reeled - Loose packed in boxes (minimum lead length 30mm). W23’s and W24’s are available only as loose packed in boxes. 6 6 b f2 f1 10 ± 0.5 Type A W21 63 ± 2 W215 73 ± 2 W22 73 ± 2 Body location: f1 - f2 ≤ 1.4mm Standard Quantities Per Package Type Code W21 W215 W22 W23 W24 Ammo Pack A 1000 600 500 --- --- Reel R 1000 800 700 --- --- Small Box SB 200 100 100 50 25 Large Box LB 800 500 300 --- --- Ordering Data Specify type, reference, etc. as indicated in this example of W21, 0.1KΩ, 5%, taped and ammo packed. Sample Part No. W21 9K1 J A IRC Type Value Tolerance Code J = 5%, G = 2%, F = 1% Packaging Details Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com W20 Series Issue December 2008 Sheet 4 of 4