12
34
12
43
DUAL INDUCTOR MODE SERIES MODE
2.50
(.098)
REF.
REF.
REF. 2.50
(.098)
REF.
0.50
(.020) REF. 0.50
(.020)
3.85
(.152)
REF.
3.85
(.152)
13.80
(.543)
REF.
13.80
(.543)
REF.
Features
■ Multiple applications: parallel, series,
dual-inductor and transformer
■ Magnetically shielded, low radiation
■ Inductance range: 0.47 to 4000 μH
■ Rated current up to 17.9 A
■ RoHS compliant*
Applications
■ SEPIC topology
■ Power supplies for:
- Communication equipment
- Notebooks, desktop computers,
servers
- LCDs, fl 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.
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
Test Voltage ..................................0.25 V
Hi-pot .................500 Vrms, 3 mA, 3 sec.
Refl ow Soldering .. 230 °C; 50 sec. max.
Operating Temperature
................................. -40 °C to +125 °C
(Temperature rise included)
Storage Temperature .. -40 °C to +125 °C
Resistance to Solder Heat
...............................+260 °C for 10 sec.
Electrical Specifi cations @ 25 °C
Bourns
Part No.
Parallel Rating Series Rating
Inductance
@ 100 KHz
L (μH)
Tol.
(%)
DCR
(Ω)
Max.
Irms
(A)
Isat
(A)
Inductance
@ 100 KHz
L (μH)
Tol.
(%)
DCR
(Ω)
Max.
Irms
(A)
Isat
(A)
SRF1280-R47Y 0.47 ±30 0.0055 17.9 56 1.88 ±30 0.0216 8.94 28
SRF1280-1R0Y 1.0 ±30 0.0067 15.5 40 4 ±30 0.026 7.74 20
SRF1280-1R5Y 1.5 ±30 0.0076 13.5 31.1 6 ±30 0.0306 6.77 15.6
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
SRF1280-4R7Y 4.7 ±30 0.0135 8.25 16.5 18.8 ±30 0.05 4.13 8.24
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
SRF1280-100M 10 ±20 0.0241 6.04 11.2 40 ±20 0.0921 3.02 5.6
SRF1280-150M 15 ±20 0.0333 5.03 9.66 60 ±20 0.129 2.51 4.83
SRF1280-220M 22 ±20 0.0503 4 7.57 88 ±20 0.192 2 3.78
SRF1280-330M 33 ±20 0.0664 3.23 6.22 132 ±20 0.265 1.61 3.11
SRF1280-470M 47 ±20 0.0898 2.95 5.28 188 ±20 0.353 1.47 2.64
SRF1280-680M 68 ±20 0.123 2.44 4.44 272 ±20 0.469 1.22 2.22
SRF1280-820M 82 ±20 0.153 2.09 4.06 328 ±20 0.578 1.04 2.03
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
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
SRF1280-471M 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
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
General Specifi cations
Core ..............................................Ferrite
Wire ............................Enameled copper
Base ................................................LCP
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
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)
43
12
12.50
(.492) MAX.
MAX.
12.50
(.492)
MAX.
8.00
(.315)
1.80 ± 0.2
(.071 ± .008)
5.00 ± 0.3
(.197 ± .012)
7.60 ± 0.2
(.299 ± .008)
10 1
USER DIRECTION OF FEED
200
(7.87)
NO COMPONENT NO COMPONENTCOMPONENTS
400
(15.75)
START
4.0
(.157)
16.0
(.630)
END
SRF0504 Series - Line Filter
Packaging Specifi cations
DIMENSIONS: MM
(INCHES)
QTY: 400 PCS. PER REEL
REV. 05/12
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
SRF1280 Series - Dual-Winding Shielded Power Inductors
Asia-Pacifi 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)
