Commercial Styles Semi-Precision Power Wirewound Resistors High thermal conductivity, centerless ground ceramic cores for optimum heat distribution and dissipation T Wirewound Series • 0.1Ω to 300KΩ • 0.75 to 14 watts • ±0.1% to ±10% tolerance Weldable and solderable leads • Non-inductive windings available Silicone coat • Meets or exceeds all applicable MIL-R-26 ratings All welded construction Electrical Data Wattage Rating Resistance Range (Ω) Similar To MIL-R-26 Style U V Min Ω Max KΩ Maximum Working Voltage --- 0.75 --- 0.1 4 54.8 T-1/2-A81 RW81 1.0 --- 0.1 4.5 67.1 T-1A-70 RW70 1.0 --- 0.1 12 109.5 T-1-80 RW80 2.0 --- 0.1 12 154.9 T-2A* --- 3.0 3.75 0.1 25 306.2 T-2A-69 RW69 --- 3.0 0.1 20 244.9 T-2B-79 RW79 3.0 --- 0.1 40 346.4 T-3* --- 4.0 5.5 0.1 38 457.2 T-5* --- 5.0 6.5 0.1 45 540.8 RW74 5.0 --- 0.1 94 685.5 --- 6.0 7.5 0.1 65 698.2 RW67 --- 6.5 0.1 92 773.3 --- 7.0 9.0 0.1 115 1017.3 T-7A-55 RW55 --- 7.0 0.1 200 1183.2 T-10A-56 RW56 --- 14.0 0.1 300 2049.4 --- 10.0 13.0 0.1 300 1974.8 T-10-78 RW78 10.0 --- 0.1 300 1732 T-10-68 RW68 --- 11.0 0.1 300 1816.6 IRC Style T-1/2 T-5-74 T-6 T-6-67 T-7* T-10* * Available as radial lead = type TR. To designate non-inductive winding, add prefix "N" to style. 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 T Wirewound Series Issue December 2008 Sheet 1 of 4 Commercial Styles Semi-Precision Power Wirewound Resistors General Specifications Temperature Range Characteristic U = -55°C to +275°C Characteristic V = -55°C to +350°C Standard Temperature Coefficient ±20 ppm/°C 10Ω up ±50 ppm/°C 1.0Ω to 9.9Ω ±400 ppm/°C 0.50Ω to 0.999Ω ±650 ppm/°C 0.1Ω to 0.490Ω Special Temperature Coefficient Available from -30 ppm/°C to +6000 ppm/°C Temperature range for special TC’s -50°C to +150°C Insulation Resistance 1000 megohms minimum dry at 100 volts DC Derating Wattage rating based on operation at 25°C Derate to zero at 275°C & 350°C for "U" and "V" style rating Lead Material: Tinned copperweld is standard. Also available: Weldable Grade A nickel (bare) Special Features: - Radial lead available - Resistance network packages designed to individual customer requirements - Temperature coefficient matching and tracking to ±5 ppm - High thermal conductivity core (Beryllium Oxide) available. See B Series. - Ratio tolerance matched sets available 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 T Wirewound Series Issue December 2008 Sheet 2 of 4 Commercial Styles Semi-Precision Power Wirewound Resistors Physical Data A Length B Diameter C Diameter 1 ½” (38.1mm) Minimum Lead Length Dimensions (Inches and (mm)) IRC / Shallcross Style A B C Inches mm Inches mm Inches (±0.002) mm (±0.05) T-1/2 0.330 (±0.062) 8.4 (±1.6) 0.078 (±0.031) 2.0 (±0.8) 0.020 0.5 T-1/2-A81 0.250 (±0.032) 6.4 (±0.8) 0.085 (±0.020) 2.2 (±0.5) 0.020 0.5 T-1A-70 0.406 (±0.032) 10.3 (±0.8) 0.094 (±0.032) 2.4 (±0.8) 0.020 0.5 T-1-80 0.406 (±0.032) 10.3 (±0.8) 0.094 (±0.032) 2.4 (±0.8) 0.020 0.5 T-2A 0.500 (±0.062) 12.7 (±1.6) 0.187 (±0.031) 4.8 (±0.8) 0.032 0.8 T-2A-69 0.500 (±0.063) 12.7 (±1.6) 0.188 (±0.063) 4.8 (±1.6) 0.032 0.8 T-2B-79 0.560 (±0.062) 14.2 (±1.6) 0.187 (±0.031) 4.8 (±0.8) 0.032 0.8 T-3 0.625 (±0.062) 15.8 (±1.6) 0.250 (±0.062) 6.3 (±1.6) 0.040 1.0 T-5 0.875 (±0.062) 22.2 (±1.6) 0.312 (±0.062) 7.9 (±1.6) 0.040 1.0 T-5-74 0.875 (±0.062) 22.2 (±1.6) 0.312 (±0.062) 7.9 (±1.6) 0.040 1.0 T-6 1.000 (±0.062) 25.4 (±1.6) 0.312 (±0.062) 8.0 (±1.6) 0.040 1.0 T-6-67 1.000 (±0.094) 25.4 (±2.4) 0.313 (±0.063) 8.0 (±1.6) 0.032 0.8 T-7 1.185 (±0.062) 30.0 (±1.6) 0.312 (±0.062) 8.0 (±1.6) 0.040 1.0 T-7A-55 1.375 (±0.094) 35.0 (±2.4) 0.469 (±0.094) 12 (±2.4) 0.032 0.8 T-10A-56 2.000 (±0.094) 50.8 (±2.4) 0.469 (±0.094) 12 (±2.4) 0.032 0.8 T-10 1.812 (±0.062) 46.0 (±1.6) 0.375 (±0.062) 9.5 (±1.6) 0.040 1.0 T-10-78 1.780 (±0.062) 45.2 (±1.6) 0.375 (±0.062) 9.5 (±1.6) 0.040 1.0 T-10-68 1.875 (±0.063) 47.6 (±1.6) 0.344 (±0.094) 8.7 (±2.4) 0.032 0.8 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 T Wirewound Series Issue December 2008 Sheet 3 of 4 Commercial Styles Semi-Precision Power Wirewound Resistors Ordering Data Sample Part No. T180 1000 1% Style Resistance Value Expressed in ohms (Standard EIA/MIL values) Tolerance F = ±1%, D = ±0.5%, B = ±0.1% 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 T Wirewound Series Issue December 2008 Sheet 4 of 4