Features
n Multiple applications: parallel, series,
dual-inductor and transformer
n Magnetically shielded, low radiation
n Inductance range: 0.47 to 4000 μH
n Rated current up to 17.9 A
n AEC-Q200 qualified
n RoHS compliant* and halogen free**
Applications
n Automotive systems:
- Driver assistant - Entertainment
- Information - Lighting
n DC/DC converters
n Power supplies
n SEPIC - DC/DC converters
SRF1280A Series - Dual-Winding Shielded Power Inductors
Test Voltage ..................................0.25 V
Operating Temperature
................................-40 °C to +125 °C
(Temperature rise included)
Storage Temperature
................................-40 °C to +125 °C
Resistance to Solder Heat
.............................+245 °C for 10 sec.
Temperature Rise
.......................40 °C typ. at rated
Irms
Inductance drop ...................30 % at Isat
Electrical Specications @ 25 °C General Specications
Core ..............................................Ferrite
Wire ............................Enameled copper
Terminal Finish ...................................Sn
Packaging .................... 400 pcs. per reel
Materials
Product Dimensions
*RoHS COMPLIANT
& AEC-Q200 QUALIFIED
*RoHS COMPLIANT
AEC APPROVED (Select Models)
LEAD FREE
*RoHS COMPLIANT
VERSIONS
AVAILABLE
LEAD FREE
VERSIONS ARE
RoHS COMPLIANT*
DIMENSIONS:
MM
(INCHES)
How to Order
SRF1280A - 100M
Model
Value Code (see table)
* RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
** Bourns follows the prevailing definition of “halogen free” in the industry. Bourns considers a product to be
“halogen free” if (a) the Bromine (Br) content is 900 ppm or less; (b) the Chlorine (Cl) content is 900 ppm or less;
and (c) the total Bromine (Br) and Chlorine (Cl) content is 1500 ppm or less.
Specifications 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 specific applications.
Bourns
Part No.
Parallel Rating Series Rating
Inductance
@ 100 KHz
L (μH)
Tol.
(%)
DCR
(W)
Max.
Irms
(A)
Isat
(A)
Inductance
@ 100 KHz
L (μH)
Tol.
(%)
DCR
(W)
Max.
Irms
(A)
Isat
(A)
SRF1280A-R47Y 0.47 ± 30 0.0055 17.9 56 1.88 ± 30 0.0216 8.94 28
SRF1280A-1R0Y 1.0 ± 30 0.0067 15.5 40 4 ± 30 0.026 7.74 20
SRF1280A-1R5Y 1.5 ± 30 0.0076 13.5 31.1 6 ± 30 0.0306 6.77 15.6
SRF1280A-2R2Y 2.2 ± 30 0.0092 12.5 25.5 8.8 ± 30 0.0338 6.23 12.7
SRF1280A-3R3Y 3.3 ± 30 0.011 10.4 21.5 13.2 ± 30 0.04 5.23 10.8
SRF1280A-4R7Y 4.7 ± 30 0.0135 8.25 16.5 18.8 ± 30 0.05 4.13 8.24
SRF1280A-6R8Y 6.8 ± 30 0.0183 7.34 13.3 27.2 ± 30 0.0656 3.67 6.67
SRF1280A-8R2Y 8.2 ± 30 0.0191 6.32 12.2 32.8 ± 30 0.0714 3.16 6.09
SRF1280A-100M 10 ± 20 0.0241 6.04 11.2 40 ± 20 0.0921 3.02 5.6
SRF1280A-150M 15 ± 20 0.0333 5.03 9.66 60 ± 20 0.129 2.51 4.83
SRF1280A-220M 22 ± 20 0.0503 4 7.57 88 ± 20 0.192 2 3.78
SRF1280A-330M 33 ± 20 0.0664 3.23 6.22 132 ± 20 0.265 1.61 3.11
SRF1280A-470M 47 ± 20 0.0898 2.95 5.28 188 ± 20 0.353 1.47 2.64
SRF1280A-680M 68 ± 20 0.123 2.44 4.44 272 ± 20 0.469 1.22 2.22
SRF1280A-820M 82 ± 20 0.153 2.09 4.06 328 ± 20 0.578 1.04 2.03
SRF1280A-101M 100 ± 20 0.175 1.96 3.64 400 ± 20 0.701 0.98 1.82
SRF1280A-151M 150 ± 20 0.261 1.59 3.01 600 ± 20 1.013 0.796 1.51
SRF1280A-221M 220 ± 20 0.343 1.29 2.43 880 ± 20 1.38 0.645 1.22
SRF1280A-331M 330 ± 20 0.54 1.04 2.01 1320 ± 20 2.172 0.522 1.01
SRF1280A-471M 470 ± 20 0.865 0.85 1.68 1880 ± 20 3.3 0.427 0.838
SRF1280A-681M 680 ± 20 1.296 0.76 1.39 2720 ± 20 4.888 0.38 0.697
SRF1280A-821M 820 ± 20 1.632 0.65 1.27 3280 ± 20 5.896 0.325 0.633
SRF1280A-102M 1000 ± 20 1.992 0.61 1.14 4000 ± 20 7.202 0.307 0.571
12.50
(.492)
MAX.
MAX.
12.50
(.492)
MAX.
8.00
(.315)
4
3
1
2
1.80 ± 0.2
(.071 ± .008)
5.00 ± 0.3
(.197 ± .012)
5.00 ± 0.3
(.197 ± .012)
12
34
1
2
43
DUAL INDUCTOR MODE SERIES MODE
2.15
(.085)
2.15
(.085)
1.28
(.050)
1.28
(.050)
4.50
(.177)
4.50
(.177)
13.00
(.512)
13.00
(.512)
12.50
(.492)
MAX.
MAX.
12.50
(.492)
MAX.
8.00
(.315)
4
3
1
2
1.80 ± 0.2
(.071 ± .008)
5.00 ± 0.3
(.197 ± .012)
5.00 ± 0.3
(.197 ± .012)
12
34
1
2
43
DUAL INDUCTOR MODE SERIES MODE
2.15
(.085)
2.15
(.085)
1.28
(.050)
1.28
(.050)
4.50
(.177)
4.50
(.177)
13.00
(.512)
13.00
(.512)
Recommended Layout
Electrical Schematic
DIMENSIONS:
MM
(INCHES)
21
34
1
2
3
4
3
DUAL INDUCTOR MODE SERIES MODE
4
2
1
7.6
(.299)
MAX.
7.6
(.299)
MAX.
TYP.
TYP.
0.4
(.016)
2.9
(.114)
1.0
(.039)
1.0
(.039)
1.73
(.068)
7.9
(.311)
0.4
(.016)
1.0
(.039)
1.73
(.068)
7.9
(.311)
3.4 ± 0.2
(.134 ± .008)
2.7
(.106)
TYP.
N2
2
4
N1
1
3
N2
2
4
N1
1
3
N2
2
4
N1
1
3
PARALLEL SERIES
101
