Features Applications Multiple applications: parallel, series, DC/DC converters dual-inductor and transformer Power supplies Magnetically shielded, low radiation SEPIC - DC/DC converters Inductance range: 0.47 to 1000 H Rated current up to 17.9 A AEC-Q200 compliant RoHS compliant* and halogen free** SRF1280A Series - Dual-Winding Shielded Power Inductors Electrical Specifications 25 C General Specifications Test Voltage ..................................0.25 V Parallel Rating Series Rating Operating Temperature Inductance DCR Inductance DCR ................................-40 C to +125 C Bourns 100 KHz Tol. () Irms Isat 100 KHz Tol. () Irms Isat (Temperature rise included) Part No. L (H) (%) Max. (A) (A) L (H) (%) Max. (A) (A) Storage Temperature SRF1280A-R47Y 0.47 30 0.0055 17.9 56 1.676 30 0.0216 8.94 28 ................................-40 C to +125 C SRF1280A-1R0Y 1.0 30 0.0067 15.5 40 3.284 30 0.026 7.74 20 Temperature Rise SRF1280A-1R5Y 1.5 30 0.0076 13.5 31.1 5.428 30 0.0306 6.77 15.6 .......................40 C typ. at rated Irms SRF1280A-2R2Y 2.2 30 0.0092 12.5 25.5 8.108 30 0.0338 6.23 12.7 Inductance drop ...................30 % at Isat SRF1280A-3R3Y 3.3 30 0.011 10.4 21.5 11.320 30 0.04 5.23 10.8 Hi-pot (N1-N2) ................500 Vac/60 Hz, SRF1280A-4R7Y 4.7 30 0.0135 8.25 16.5 19.360 30 0.05 4.13 8.24 3 mA, 1 sec SRF1280A-6R8Y 6.8 30 0.0183 7.34 13.3 29.550 30 0.0656 3.67 6.67 Moisture Sensitivity Level ..................... 1 SRF1280A-8R2Y 8.2 30 0.0191 6.32 12.2 35.440 30 0.0714 3.16 6.09 ESD Classification (HBM)................. N/A SRF1280A-100M 10 20 0.0241 6.04 11.2 41.880 20 0.0921 3.02 5.6 SRF1280A-150M 15 20 0.0333 5.03 9.66 56.360 20 0.129 2.51 4.83 Materials SRF1280A-220M 22 20 0.0503 4 7.57 91.720 20 0.192 2 3.78 SRF1280A-330M 33 20 0.0664 3.23 6.22 135.700 20 0.265 1.61 3.11 Core ..............................................Ferrite SRF1280A-470M 47 20 0.0898 2.95 5.28 188.200 20 0.353 1.47 2.64 Wire ............................Enameled copper Terminal Finish ...................................Sn SRF1280A-680M 68 20 0.123 2.44 4.44 265.900 20 0.469 1.22 2.22 Packaging .................... 400 pcs. per reel SRF1280A-820M 82 20 0.153 2.09 4.06 319.000 20 0.578 1.04 2.03 SRF1280A-101M 100 20 0.175 1.96 3.64 397.200 20 0.701 0.98 1.82 SRF1280A-151M 150 20 0.261 1.59 3.01 579.600 20 1.013 0.796 1.51 Product Dimensions SRF1280A-221M 220 20 0.343 1.29 2.43 886.000 20 1.38 0.645 1.22 12.50 MAX. SRF1280A-331M 330 20 0.54 1.04 2.01 1294.000 20 2.172 0.522 1.01 (.492) SRF1280A-471M 470 20 0.865 0.85 1.68 1868.000 20 3.3 0.427 0.838 DOT INDICATES SRF1280A-681M 680 20 1.296 0.76 1.39 2707.000 20 4.888 0.38 0.697 TERMINAL 1 SRF1280A-821M 820 20 1.632 0.65 1.27 3272.000 20 5.896 0.325 0.633 SRF1280A-102M 1000 20 1.992 0.61 1.14 4020.000 20 7.202 0.307 0.571 12.50 (.492) MAX. Electrical Schematic 1 2 1 2 1 2 8.00 N1 N2 N1 N2 N1 N2 MAX. (.315) 3 4 3 4 3 4 5.00 0.3 (.197 .012) 4 3 PARALLEL SERIES 5.00 0.3 (.197 .012) Recommended Layout 4.50 4.50 2.15 2.15 (.177) (.177) (.085) (.085) 12 1 2 1 2 1.80 0.2 13.00 13.00 (.071 .008) (.512) (.512) MM MM DIMENSIONS: DIMENSIONS: (INCHES) (INCHES) 43 4 3 1.28 1.28 (.050) (.050) WARNING Cancer and Reproductive Harm DUAL INDUCTOR MODE SERIES MODE www.P65Warnings.ca.gov * RoHS Directive 2015/863, Mar 31, 2015 and Annex. ** Bourns considers a product to be halogen free if (a) the Bromine (Br) content is 900 ppm or less (b) Specications are subject to change without notice. Users should verify actual device performance in their specic the Chlorine (Cl) content is 900 ppm or less and (c) applications. The products described herein and this document are subject to specic legal disclaimers as set forth on the the total Bromine (Br) and Chlorine (Cl) content is last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. 1500 ppm or less. 101 *RoHS COMPLIANT, **HALOGEN FREE & AEC COMPLIANT SRF1280A Series - Dual-Winding Shielded Power Inductors Inductance vs. IDC SRF1280A-470M SRF1280A-681M SRF1280A-102M L 25 C L 125 C L 25 C L 125 C L 25 C L 125 C 50.0 800.0 1200.0 40.0 600.0 900.0 30.0 600.0 400.0 20.0 200.0 300.0 10.0 0.0 0.0 0.0 0.0 1.1 2.2 3.3 4.4 0.0 0.3 0.6 0.9 1.2 0.0 0.2 0.4 0.6 0.8 1.0 IDC (A) IDC (A) IDC (A) Temperature Rise vs. IDC SRF1280A-470M SRF1280A-681M SRF1280A-102M T 25 C T 25 C T 25 C 100.0 100.0 100.0 80.0 80.0 80.0 60.0 60.0 60.0 40.0 40.0 40.0 20.0 20.0 20.0 0.0 0.0 0.0 0.0 1.13 2.25 3.38 4.50 0.0 0.28 0.55 0.83 1.10 0.0 0.20 0.40 0.60 0.80 1.00 IDC (A) IDC (A) IDC (A) Soldering Profile How to Order Temperature SRF1280A - 100M Rising Area Preheat Area Reflow Area Forced Cooling Area Model +4.0 C / sec. max. 150~200 C / 60~120 sec. +3.0 C / sec. max. -(1.0~5.0) C / sec. max. Value Code (see table) 250 217 C 60 ~ 150 sec. Peak Temperature: 200 60 sec. max. 245 C max. 150 Time Above 245 C: 60 ~ 120 sec. 30 sec. max. 100 Time Above 217 C: 60 ~ 150 sec. max. 50 0 50 100 150 200 250 Time (Seconds) Specications are subject to change without notice. Users should verify actual device performance in their specic applications. The products described herein and this document are subject to specic legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. T (C) L (H) Temperature (C) T (C) L (H) L (H) T (C)