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| Molded Surface Mount Wirewound Resistor WSM Series * * * * * Flexible Terminations All welded construction Ideal for automatic pick and place Lead free, RoHS compliant construction available Contact factory for ohmic values above published ranges Electrical Data IRC Type WSM-1 WSM-2 WSM-3 Power Rating Resistance Maximum Working Range @ 70C Voltage (watts) (ohms) (volts) 1W 2W 3W 0.01 to 1K 0.01 to 2K 0.01 to 3K TCR (ppm/C) Resistance Standard Tolerance Values (%) Ambient Temperature (C) P x R 0.1 - <10: 100 1: 20 *1, 2, 5, 10 E24 Preferred -55 to 155 *Note: 5% or 10% preferred below 0.1 ohms. CONSTRUCTION A high purity ceramic substrate is assembled with interference fit end caps to which are welded the terminations. The resistive element is wound on the substrate and welded to the caps. The unit is then molded. FLAMMABILITY The resistor coating is categorized as flame retardant epoxy under UL-94. SOLVENT RESISTANCE The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. MARKING WSM resistors are legend marked with type, value and tolerance. 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 WSM Series Issue December 2008 Sheet 1 of 3 Molded Surface Mount Wirewound Resistor Recommended Pad Sizes B C A B Dimensions (Inches & mm)) Type WSM-1 WSM-2 WSM-3 A 0.115 (2.9) 0.134 (3.4) 0.134 (3.4) B 0.100 (2.6) 0.158 (4.0) 0.178 (4.5) C 0.189 (2.9) 0.237 (6.0) 0.434 (11.0) D 0.389 (9.9) 0.552 (14.0) 0.788 (20.0) Physical Data L L l l W W W W H H Dimensions (Inches & mm)) Type WSM-1 WSM-2 WSM-3 L 0.310 max (7.9 max) 0.473 max (12 max) 0.709 max (18 max) l 0.100 nom (2.54 nom) 0.122 nom (3.1 nom) 0.122 nom (3.1 nom) W 0.275 max (7.0 max) 0.413 max (10.5 max) 0.630 max (16 max) w 0.165 max (4.2 max) 0.260 max (6.6 max) 0.276 max (7 max) H 0.155 max (3.94 max) 0.217 max (5.5 max) 0.256 max (6.5 max) WSM Series Issue December 2008 Sheet 2 of 3 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 Molded Surface Mount Wirewound Resistor Environmental Data Characteristics Load at Rated Power: 1000 hours @ 70C Dry Heat: Short Term Overload Derating from Rated Power @ 70C Moisture Temperature Cycling Resistance to Solder Heat Isolation Voltage Insulation Resistance Substrate Bend R% R% R% volts ohms R% 1 0.001 1000 hours @ 155C R% R% R% WSM-1 2 0.001 2 0.001 WSM-2 2 0.001 2 0.001 2 0.001 zero at 155C 1 0.001 1 0.001 1 0.001 1,000 >1000M 0.2 0.001 1.5 0.001 WSM-1 3 0.001 3 0.001 *Note: The power ratings to be applied depend upon the board used and the ambient temperature. Ordering Data Specify type, reference, etc. as indicated in this example of a WSM3 6801 F resistor with tape and reel packaging. Standard Quantities Per Package Type F LF TR Code R WSM1 1500 WSM2 800 WSM3 750 Sample Part No. IRC Type WSM3 6801 13" Reel (330mm) (WSM1, WSM2, WSM3) Packaging: WSM2 resistors are supplied on .945 (24mm) wide carrier tape. WSM3 resistors are supplied on 1.26 (32mm) wide carrier tape. Both products are reeled onto 13.00 (330mm) diameter reels. *For packaging information, see Appendix "A". Dimensions (Inches and (mm)) Resistance Value (100 and greater - First 3 significant digits plus 4th digit multiplier) Example: 100 = 1000, 1000 = 1001, 150,000 = 1503 (Less than 100 - "R" is used to designate decimal) Example: 51 = 51R0, 1 = 1R00, 0.25 = R250 Tolerance (K = 10%, J = 5%, G = 2%, F = 1%) Lead Free, RoHS Designator Packaging Code (TR = 13" Reel) Ao .165 (4.2) .266 (6.75) .288 (7.3) Bo .300 (7.62) .470 (11.95) .721 (18.3) Ko .165 (4.20) .206 (5.22) .264 (6.7) W .630 (16.0) .945 (24.0) 1.26 (32.0) P .315 (8.00) .473 (12.0) .473 (12.0) T .014 (0.36) .014 (0.36) .016 (0.4) B0 A0 P K0 WSM1 WSM2 W WSM3 t 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 WSM Series Issue December 2008 Sheet 3 of 3 |
Price & Availability of WSM26801FLFTR
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