Features
Applications
■ Multiple applications: parallel, series,
■ DC/DC converters
dual-inductor and transformer
■ Power supplies
■ Magnetically shielded, low radiation
■ Inductance range: 0.47 to 1000 μH
■ Rated current up to 17.9 A
■ SEPIC - DC/DC converters
1
10
■ 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
Operating Temperature
................................-40 °C to +125 °C
(Temperature rise included)
Storage Temperature
................................-40 °C to +125 °C
Temperature Rise
Parallel Rating
Series Rating
DCR
Inductance
DCR
(Ω)
Inductance
Bourns
Part No.
@ 100 KHz Tol.
Irms Isat @ 100 KHz Tol.
(Ω)
Irms Isat
L (μH)
(%)
Max.
(A)
(A)
L (μH)
(%)
Max.
(A)
(A)
SRF1280A-R47Y
SRF1280A-1R0Y
SRF1280A-1R5Y
SRF1280A-2R2Y
SRF1280A-3R3Y
SRF1280A-4R7Y
SRF1280A-6R8Y
SRF1280A-8R2Y
SRF1280A-100M
SRF1280A-150M
SRF1280A-220M
SRF1280A-330M
SRF1280A-470M
SRF1280A-680M
SRF1280A-820M
SRF1280A-101M
SRF1280A-151M
SRF1280A-221M
SRF1280A-331M
SRF1280A-471M
SRF1280A-681M
SRF1280A-821M
SRF1280A-102M
0.47
1.0
1.5
2.2
3.3
4.7
6.8
8.2
10
15
22
33
47
± 30 0.0055
± 30 0.0067
± 30 0.0076
± 30 0.0092
17.9
15.5
56
40
1.676
3.284
5.428
± 30 0.0216 8.94
± 30 0.026 7.74
± 30 0.0306 6.77 15.6
± 30 0.0338 6.23 12.7
28
20
13.5 31.1
12.5 25.5
10.4 21.5
8.25 16.5
7.34 13.3
6.32 12.2
.......................40 °C typ. at rated Irms
Inductance drop...................30 % at Isat
Hi-pot (N1-N2) ................500 Vac/60 Hz,
3 mA, 1 sec
8.108
± 30
0.011
11.320
19.360
29.550
35.440
41.880
56.360
91.720
135.700
188.200
265.900
319.000
397.200
579.600
886.000
± 30
± 30
0.04
0.05
5.23 10.8
4.13 8.24
± 30 0.0135
± 30 0.0183
± 30 0.0191
± 20 0.0241
± 20 0.0333
± 20 0.0503
± 20 0.0664
± 20 0.0898
± 30 0.0656 3.67 6.67
± 30 0.0714 3.16 6.09
± 20 0.0921 3.02
± 20 0.129
± 20 0.192
± 20 0.265
± 20 0.353
± 20 0.469
± 20 0.578
± 20 0.701
Moisture Sensitivity Level.....................1
................. N/A
ESD Classification (HBM)
6.04
5.03 9.66
7.57
11.2
5.6
2.51 4.83
Materials
4
2
1.61
3.78
3.11
Core..............................................Ferrite
Wire ............................Enameled copper
Terminal Finish ...................................Sn
Packaging.................... 400 pcs. per reel
3.23 6.22
2.95 5.28
2.44 4.44
2.09 4.06
1.96 3.64
1.59 3.01
1.29 2.43
1.04 2.01
0.85 1.68
0.76 1.39
0.65 1.27
0.61 1.14
1.47 2.64
1.22 2.22
1.04 2.03
0.98 1.82
68
82
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
0.123
0.153
0.175
0.261
0.343
0.54
0.865
1.296
1.632
1.992
100
150
220
330
470
680
820
1000
± 20 1.013 0.796 1.51
± 20 1.38 0.645 1.22
Product Dimensions
12.50
MAX.
(.492)
1294.000 ± 20 2.172 0.522 1.01
1868.000 ± 20
3.3
0.427 0.838
0.38 0.697
DOT
INDICATES
TERMINAL 1
2707.000 ± 20 4.888
3272.000 ± 20 5.896 0.325 0.633
4020.000 ± 20 7.202 0.307 0.571
12.50
(.492)
MAX.
Electrical Schematic
1
2
1
2
1
2
8.00
MAX.
(.315)
N1
N2
N1
3
N2
N1
N2
3
4
4
3
4
5.00 0.3
(.197 .012)
3
2
4
1
PARALLEL
SERIES
5.00 0.3
(.197 .012)
Recommended Layout
4.50
(.177)
4.50
(.177)
2.15
(.085)
2.15
(.085)
1
2
3
1
2
3
1.80 0.2
13.00
(.512)
13.00
(.512)
(.071 .008)
MM
(INCHES)
MM
(INCHES)
DIMENSIONS:
DIMENSIONS:
4
4
1.28
(.050)
1.28
(.050)
WARNING
Cancer and Reproductive Harm
www.P65Warnings.ca.gov
DUAL INDUCTOR MODE
SERIES MODE
*
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)
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. 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.
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