Features Applications 7.6 MAX. (.299) n Multiple applications: parallel, series, n SEPIC topology dual-inductor and transformer n Power supplies for: n Magnetically shielded, low radiation - Communication equipment 7.6 - Notebooks, desktop computers, n Inductance range: 0.47 to 4000H (.299) servers MAX. n Rated current up to 17.9 A - LCDs, flat panels, backlights n RoHS compliant* - Camcorders, HDTVs SRF1280 Series - Dual-Winding Shielded Power Inductors 3.4 0.2 (.134 .008) Electrical Specifications 25 C Additional Information 2.9 Click these links for more information: TYP. Parallel Rating (.114) Series Rating 4 3 Inductance DCR Inductance DCR Bourns 100 KHz Tol. (W) Irms Isat 100 KHz Tol. (W) Irms Isat Part No. L (H) (%) Max. (A) (A) L (H) (%) Max. (A) (A) 2.7 SRF1280-R47Y 0.47 30 0.0055 17.9 56 1.88 30 0.0216 8.94 28 PRODUCT TECHNICAL INVENTORY SAMPLES CONTACT (.106) LIBRARY SRF1280-1R0Y 1.0 30 0.0067 15.5 40 4 30 0.026 7.74 20 TYP. SRF1280-1R5Y 1.5 30 0.0076 13.5 31.1 6 30 0.0306 6.77 15.6 General Specifications SRF1280-2R2Y 2.2 30 0.0092 12.5 25.5 8.8 30 0.0338 6.23 12.7 SRF1280-3R3Y 3.3 30 0.011 10.4 21.5 13.2 30 0.04 5.23 10.8 Test Voltage ..................................0.25 V 1 2 1.0 TYP. SRF1280-4R7Y 4.7 30 0.0135 8.25 16.5 18.8 30 0.05 4.13 8.24 Hi-pot .................500 Vrms, 3 mA, 3 sec. (.039) Operating Temperature SRF1280-6R8Y 6.8 30 0.0183 7.34 13.3 27.2 30 0.0656 3.67 6.67 SRF1280-8R2Y 8.2 30 0.0191 6.32 12.2 32.8 30 0.0714 3.16 6.09 ................................. -40 C to +125 C SRF1280-100M 10 20 0.0241 6.04 11.2 40 20 0.0921 3.02 5.6 (Temperature rise included) Storage Temperature .. -40 C to +125 C SRF1280-150M 15 20 0.0333 5.03 9.66 60 20 0.129 2.51 4.83 12.50 0.4 3.0 0.4 3.0 MAX. Moisture Sensitivity Level ...................... 1 SRF1280-220M 22 20 0.0503 4 7.57 88 20 0.192 2 3.78 (.016) (.118) (.492) (.016) (.118) ESD Classification (HBM) .................. N/A SRF1280-330M 33 20 0.0664 3.23 6.22 132 20 0.265 1.61 3.11 1 DOT2 1 2 SRF1280-470M 47 20 0.0898 2.95 5.28 188 20 0.353 1.47 2.64 INDICATES SRF1280-680M 68 20 0.123 2.44 4.44 272 20 0.469 1.22 2.22 Product Dimensions TERMINAL 1 7.9 12.50 7.9 SRF1280-820M 82 20 0.153 2.09 4.06 328 20 0.578 1.04 2.03 (.311) (.311) (.492) 12.50 SRF1280-101M 100 20 0.175 1.96 3.64 400MAX. 20 0.701 0.98 1.82 MAX. (.492) 4 3 4 3 SRF1280-151M 150 20 0.261 1.59 3.01 600 20 1.013 0.796 1.51 SRF1280-221M 220 20 0.343 1.29 2.43 880 20 1.38 0.645 1.22 1.4 1.4 DOT (.055) (.055) INDICATES SRF1280-331M 330 20 0.54 1.04 2.01 1320 20 2.172 0.522 1.01 TERMINAL 1 DUAL INDUCTOR MODE SERIES MODE SRF1280-471M 470 20 0.865 0.85 1.68 1880 20 3.3 0.427 0.838 12.50 (.492) SRF1280-681M 680 20 1.296 0.76 1.39 2720 20 4.888 0.38 0.697 8.00 MAX. MAX. (.315) SRF1280-821M 820 20 1.632 0.65 1.27 3280 20 5.896 0.325 0.633 SRF1280-102M 1000 20 1.992 0.61 1.14 4000 20 7.202 0.307 0.571 Electrical Schematic 5.00 0.3 (.197 .012) 4 3 5.00 0.3 8.00 1 2 1 2 1 2 (.197 .012) MAX. (.315) N1 N2 N1 N2 N1 N2 5.00 0.3 (.197 .012) 4 3 5.00 0.3 (.197 .012) 1 2 3 4 3 4 3 4 1.80 0.2 (.071 .008) PARALLEL SERIES Recommended Layout 4.50 4.50 2.15 2.15 1 2 (.177) (.177) 1.80 0.2 (.085) (.085) (.071 .008) 1 2 12 MM DIMENSIONS: 13.00 (INCHES) 13.00 (.512) (.512) 4.50 4.50 2.15 2.15 (.177) (.177) 43 (.085) (.085) 4 3 1.28 1.28 12 1 2 (.050) (.050) 13.00 13.00 (.512) DUAL INDUCTOR MODE SERIES MODE (.512) *RoHS Directive 2015/863, Mar 31, 2015 and Annex. 43 4 3 WARNING Specifications are subject to change without notice. Users should verify actual device performance in their specific Cancer and Reproductive Harm 1.28 1.28 applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the (.050) (.050) www.P65Warnings.ca.gov last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. DUAL INDUCTOR MODE SERIES MODE 101 SRF1280 Series - Dual-Winding Shielded Power Inductors Materials How to Order Core ................................................................................... Ferrite SRF1280 - 100M Wire ..................................................................Enameled copper Model Base ......................................................................................LCP Value Code (see table) Adhesive ....................................................................Epoxy resin Terminal ................................................................................... Sn Rated Current ............................... Inductance drops 30 % at Isat Temperature Rise ...........................................40 C at rated Irms Packaging ............................................. 400 pcs. per 13-inch reel Packaging Specifications 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 MM DIMENSIONS: QTY: 400 PCS. PER REEL (INCHES) Asia-Pacific: Tel: +886-2 2562-4117 Email: asiacus bourns.com EMEA: Tel: +36 88 885 877 Email: eurocus bourns.com The Americas: Tel: +1-951 781-5500 Email: americus bourns.com www.bourns.com REV. 04/21 Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.