1 2 34 1 2 4 3 dual inductor mode series mode 2.15 (.085) 2.15 (.085) 1.28 (.050) 1.28 (.050) 4.50 (.204) 4.50 (.204) 13.00 (.512) 13.00 (.512) features multiple applications: parallel, series, dual-inductor and transformer magnetically shielded, low radiation inductance range: 0.47 to 4000 h rated current up to 17.9 a rohs compliant* applications sepic topology power supplies for: - communication equipment - notebooks, desktop computers, servers - lcds, at panels, backlights - camcorders, hdtvs, car audio systems srf1280 series - dual-winding shielded power inductors *rohs directive 2002/95/ec jan. 27, 2003 including annex and rohs recast 2011/65/eu june 8, 2011. speci cations are subject to change without notice. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device perfor mance may vary over time. users should verify actual device performance in their speci c applications. test voltage ..................................0.25 v hi-pot .................500 vrms, 3 ma, 3 sec. re ow soldering .. 230 ?; 50 sec. max. operating temperature ................................. -40 ? to +125 ? (temperature rise included) storage temperature .. -40 ? to +125 ? resistance to solder heat ...............................+260 ? for 10 sec. electrical speci cations @ 25 ? bourns part no. parallel rating series rating inductance @ 100 khz l ( h) tol. (%) dcr ( ) max. irms (a) isat (a) inductance @ 100 khz l ( h) tol. (%) dcr ( ) max. irms (a) isat (a) srf1280-r47y 0.47 ?0 0.0055 17.9 56 1.88 ?0 0.0216 8.94 28 srf1280-1r0y 1.0 ?0 0.0067 15.5 40 4 ?0 0.026 7.74 20 srf1280-1r5y 1.5 ?0 0.0076 13.5 31.1 6 ?0 0.0306 6.77 15.6 srf1280-2r2y 2.2 ?0 0.0092 12.5 25.5 8.8 ?0 0.0338 6.23 12.7 srf1280-3r3y 3.3 ?0 0.011 10.4 21.5 13.2 ?0 0.04 5.23 10.8 srf1280-4r7y 4.7 ?0 0.0135 8.25 16.5 18.8 ?0 0.05 4.13 8.24 srf1280-6r8y 6.8 ?0 0.0183 7.34 13.3 27.2 ?0 0.0656 3.67 6.67 srf1280-8r2y 8.2 ?0 0.0191 6.32 12.2 32.8 ?0 0.0714 3.16 6.09 SRF1280-100M 10 ?0 0.0241 6.04 11.2 40 ?0 0.0921 3.02 5.6 srf1280-150m 15 ?0 0.0333 5.03 9.66 60 ?0 0.129 2.51 4.83 srf1280-220m 22 ?0 0.0503 4 7.57 88 ?0 0.192 2 3.78 srf1280-330m 33 ?0 0.0664 3.23 6.22 132 ?0 0.265 1.61 3.11 srf1280-470m 47 ?0 0.0898 2.95 5.28 188 ?0 0.353 1.47 2.64 srf1280-680m 68 ?0 0.123 2.44 4.44 272 ?0 0.469 1.22 2.22 srf1280-820m 82 ?0 0.153 2.09 4.06 328 ?0 0.578 1.04 2.03 srf1280-101m 100 ?0 0.175 1.96 3.64 400 ?0 0.701 0.98 1.82 srf1280-151m 150 ?0 0.261 1.59 3.01 600 ?0 1.013 0.796 1.51 srf1280-221m 220 ?0 0.343 1.29 2.43 880 ?0 1.38 0.645 1.22 srf1280-331m 330 ?0 0.54 1.04 2.01 1320 ?0 2.172 0.522 1.01 srf1280-471m 470 ?0 0.865 0.85 1.68 1880 ?0 3.3 0.427 0.838 srf1280-681m 680 ?0 1.296 0.76 1.39 2720 ?0 4.888 0.38 0.697 srf1280-821m 820 ?0 1.632 0.65 1.27 3280 ?0 5.896 0.325 0.633 srf1280-102m 1000 ?0 1.992 0.61 1.14 4000 ?0 7.202 0.307 0.571 general speci cations core ..............................................ferrite wire ............................enameled copper base ................................................ lcp adhesive .............................. epoxy resin terminal ..............................................sn rated current ............ inductance drops 30 % at isat temperature rise .....40 ? at rated irms packaging ....... 400 pcs. per 13-inch reel materials product dimensions recommended layout electrical schematic dimensions: mm (inches) n2 2 4 n1 1 3 n2 2 4 n1 1 3 n2 2 4 n1 1 3 parallel series *rohs compliant how to order srf1280 - 100m model value code (see table) 12.50 (.492) max. max. 12.50 (.492) max. 8.00 (.315) 4 3 1 2 1.80 0.2 (.071 .008) 5.00 0.3 (.197 .012) 5.00 0.3 (.197 .012) 10 1
user direction of feed 200 (7.87) no component no component components 400 (15.75) start 4.0 (.157) 16.0 (.630) end srf0504 series - line filter packaging speci cations dimensions: mm (inches) qty: 400 pcs. per reel rev. 06/13 speci cations are subject to change without notice. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device perfor mance may vary over time. users should verify actual device performance in their speci c applications. srf1280 series - dual-winding shielded power inductors asia-paci c: tel: +886-2 2562-4117 ?fax: +886-2 2562-4116 europe: tel: +41-41 768 5555 ?fax: +41-41 768 5510 the americas: tel: +1-951 781-5500 ?fax: +1-951 781-5700 www.bourns.com 24.0 (.945) 26 +0 (1.024 +0) 30.4 (1.197) 2.0 0.5 (.079 .020) 50.0 -0 (1.97 -0) 330 (12.99) dia. 13.0 (.512) dia. 13.0 ?0.5 (.512 ?.020) dia. 21.0 0.8 (.827 .031)
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