Features Applications Multiple applications: parallel, series, SEPIC topology dual-inductor and transformer Power supplies for: Magnetically shielded, low radiation - Communication equipment - Notebooks, desktop computers, Inductance range: 0.47 to 4000 H servers Rated current up to 17.9 A - LCDs, at panels, backlights RoHS compliant* - Camcorders, HDTVs, car audio systems SRF1280 Series - Dual-Winding Shielded Power Inductors Electrical Speci cations 25 C General Speci cations Test Voltage ..................................0.25 V Parallel Rating Series Rating Hi-pot .................500 Vrms, 3 mA, 3 sec. Inductance DCR Inductance DCR Re ow Soldering .. 230 C 50 sec. max. Bourns 100 KHz Tol. () Irms Isat 100 KHz Tol. () Irms Isat Operating Temperature Part No. L (H) (%) Max. (A) (A) L (H) (%) Max. (A) (A) ................................. -40 C to +125 C SRF1280-R47Y 0.47 30 0.0055 17.9 56 1.88 30 0.0216 8.94 28 (Temperature rise included) SRF1280-1R0Y 1.0 30 0.0067 15.5 40 4 30 0.026 7.74 20 Storage Temperature .. -40 C to +125 C SRF1280-1R5Y 1.5 30 0.0076 13.5 31.1 6 30 0.0306 6.77 15.6 Resistance to Solder Heat SRF1280-2R2Y 2.2 30 0.0092 12.5 25.5 8.8 30 0.0338 6.23 12.7 ...............................+260 C for 10 sec. SRF1280-3R3Y 3.3 30 0.011 10.4 21.5 13.2 30 0.04 5.23 10.8 SRF1280-4R7Y 4.7 30 0.0135 8.25 16.5 18.8 30 0.05 4.13 8.24 Materials SRF1280-6R8Y 6.8 30 0.0183 7.34 13.3 27.2 30 0.0656 3.67 6.67 Core ..............................................Ferrite SRF1280-8R2Y 8.2 30 0.0191 6.32 12.2 32.8 30 0.0714 3.16 6.09 Wire ............................Enameled copper SRF1280-100M 10 20 0.0241 6.04 11.2 40 20 0.0921 3.02 5.6 Base ................................................ LCP SRF1280-150M 15 20 0.0333 5.03 9.66 60 20 0.129 2.51 4.83 Adhesive .............................. Epoxy resin SRF1280-220M 22 20 0.0503 4 7.57 88 20 0.192 2 3.78 Terminal ..............................................Sn SRF1280-330M 33 20 0.0664 3.23 6.22 132 20 0.265 1.61 3.11 Rated Current SRF1280-470M 47 20 0.0898 2.95 5.28 188 20 0.353 1.47 2.64 ............ Inductance drops 30 % at Isat SRF1280-680M 68 20 0.123 2.44 4.44 272 20 0.469 1.22 2.22 Temperature Rise .....40 C at rated Irms SRF1280-820M 82 20 0.153 2.09 4.06 328 20 0.578 1.04 2.03 Packaging ....... 400 pcs. per 13-inch reel SRF1280-101M 100 20 0.175 1.96 3.64 400 20 0.701 0.98 1.82 SRF1280-151M 150 20 0.261 1.59 3.01 600 20 1.013 0.796 1.51 How to Order SRF1280-221M 220 20 0.343 1.29 2.43 880 20 1.38 0.645 1.22 SRF1280-331M 330 20 0.54 1.04 2.01 1320 20 2.172 0.522 1.01 SRF1280 - 100M SRF1280-471M 470 20 0.865 0.85 1.68 1880 20 3.3 0.427 0.838 SRF1280-681M 680 20 1.296 0.76 1.39 2720 20 4.888 0.38 0.697 Model SRF1280-821M 820 20 1.632 0.65 1.27 3280 20 5.896 0.325 0.633 Value Code (see table) SRF1280-102M 1000 20 1.992 0.61 1.14 4000 20 7.202 0.307 0.571 Electrical Schematic Product Dimensions 12.50 MAX. 1 2 1 2 1 2 (.492) N1 N2 N1 N2 N1 N2 12.50 (.492) MAX. 3 4 3 4 3 4 PARALLEL SERIES Recommended Layout 8.00 4.50 4.50 MAX. 2.15 2.15 (.315) (.204) (.204) (.085) (.085) 2 MM DIMENSIONS: 2 1 1 (INCHES) 5.00 0.3 13.00 13.00 (.197 .012) (.512) (.512) 5.00 0.3 (.197 .012) 2 1 34 3 4 1.28 1.28 (.050) (.050) 4 3 DUAL INDUCTOR MODE SERIES MODE 1.80 0.2 (.071 .008) *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 performance may vary over time. Users should verify actual device performance in their speci c applications. 101 *RoHS COMPLIANT SRF0504 Series - Line Filter SRF1280 Series - Dual-Winding Shielded Power Inductors Packaging Speci cations 330 2.0 0.5 DIA. 30.4 (12.99) (.079 .020) (1.197) 13.0 0.5 21.0 0.8 (.512 .020) (.827 .031) DIA. 50.0 -0 (1.97 -0) 13.0 DIA. (.512) 24.0 26 +0 (.945) (1.024 +0) 16.0 4.0 (.630) (.157) END START NO COMPONENT COMPONENTS NO COMPONENT 200 400 (7.87) (15.75) USER DIRECTION OF FEED QTY: 400 PCS. PER REEL MM DIMENSIONS: (INCHES) 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 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 performance may vary over time. Users should verify actual device performance in their speci c applications.