3
DUAL INDUCTOR MODE
4
2
1
0.4
(.016)
1.4
(.055)
3.0
(.118)
7.9
(.311)
21
34
7.6
(.299)
MAX.
7.6
(.299)
MAX.
TYP.
TYP.
2.9
(.114)
1.0
(.039)
3.4 ± 0.2
(.134 ± .008)
2.7
(.106)
TYP.
Features
■ Multiple applications: parallel, series,
dual-inductor and transformer
■ Magnetically shielded, low radiation
■ Inductance range: 0.33 to 4000 μH
■ Rated current up to 6.19 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
SRF0703 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) ±20 %
DCR
(Ω)
Max.
Irms
(A)
Isat
(A)
Inductance
@ 100 KHz
L (μH) ±20 %
DCR
(Ω)
Max.
Irms
(A)
Isat
(A)
SRF0703-R33M 0.33 0.0092 6.19 14.4 1.32 0.04 3.1 7.18
SRF0703-1R0M 1.0 0.0135 5.25 7.97 4 0.072 2.63 3.99
SRF0703-1R5M 1.5 0.0191 4.64 6.52 6 0.11 2.32 3.26
SRF0703-2R2M 2.2 0.0217 4.11 5.52 8.8 0.132 2.06 2.76
SRF0703-3R3M 3.3 0.0316 3.31 4.22 13.2 0.182 1.66 2.11
SRF0703-4R7M 4.7 0.0406 3.09 3.78 18.8 0.242 1.55 1.89
SRF0703-6R8M 6.8 0.0658 2.55 3.12 27.2 0.285 1.28 1.56
SRF0703-8R2M 8.2 0.0772 2.19 2.66 32.8 0.306 1.1 1.33
SRF0703-100M 10 0.0826 2.08 2.47 40 0.342 1.04 1.24
SRF0703-150M 15 0.119 1.83 2.05 60 0.47 0.916 1.03
SRF0703-220M 22 0.15 1.62 1.67 88 0.62 0.811 0.83
SRF0703-330M 33 0.24 1.31 1.35 132 1.0 0.653 0.68
SRF0703-470M 47 0.338 1.08 1.14 188 1.28 0.542 0.57
SRF0703-680M 68 0.507 0.89 0.96 272 1.92 0.444 0.48
SRF0703-820M 82 0.61 0.86 0.89 328 2.28 0.43 0.44
SRF0703-101M 100 0.715 0.73 0.79 400 2.64 0.367 0.39
SRF0703-151M 150 0.986 0.58 0.65 600 3.63 0.289 0.32
SRF0703-221M 220 1.48 0.52 0.53 880 5.5 0.26 0.27
SRF0703-331M 330 2.16 0.42 0.44 1320 8.25 0.211 0.22
SRF0703-471M 470 2.82 0.35 0.37 1880 11.22 0.173 0.18
SRF0703-681M 680 3.96 0.29 0.31 2720 16.17 0.143 0.15
SRF0703-821M 820 5.01 0.27 0.28 3280 20.07 0.134 0.14
SRF0703-102M 1000 6.11 0.26 0.25 4000 24.42 0.128 0.13
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 ..... 1500 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
SRF0703 - 100M
Model
Value Code (see table)
1
2
3
4
SERIES MODE
0.4
(.016)
1.4
(.055)
3.0
(.118)
7.9
(.311)
471
