FR
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AE LIAN
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PL A L
IA O
NT GE
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Applications
■ Multiple applications: parallel, series,
■ DC/DC converters
■
10 1
*R
oH
S
Features
■
■
■
■
dual-inductor and transformer
Magnetically shielded, low radiation
Inductance range: 0.47 to 1000 μH
Rated current up to 17.9 A
AEC-Q200 compliant
RoHS compliant* and halogen free**
■ Power supplies
■ SEPIC - DC/DC converters
SRF1280A Series - Dual-Winding Shielded Power Inductors
Electrical Specifications @ 25 °C
General Specifications
Parallel Rating
Bourns
Part No.
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
Inductance
@ 100 KHz
L (μH)
0.47
1.0
1.5
2.2
3.3
4.7
6.8
8.2
10
15
22
33
47
68
82
100
150
220
330
470
680
820
1000
Tol.
(%)
± 30
± 30
± 30
± 30
± 30
± 30
± 30
± 30
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
DCR
(Ω)
Max.
0.0055
0.0067
0.0076
0.0092
0.011
0.0135
0.0183
0.0191
0.0241
0.0333
0.0503
0.0664
0.0898
0.123
0.153
0.175
0.261
0.343
0.54
0.865
1.296
1.632
1.992
Series Rating
Irms
(A)
17.9
15.5
13.5
12.5
10.4
8.25
7.34
6.32
6.04
5.03
4
3.23
2.95
2.44
2.09
1.96
1.59
1.29
1.04
0.85
0.76
0.65
0.61
Inductance
@ 100 KHz
Isat
(A)
56
40
31.1
25.5
21.5
16.5
13.3
12.2
11.2
9.66
7.57
6.22
5.28
4.44
4.06
3.64
3.01
2.43
2.01
1.68
1.39
1.27
1.14
L (μH)
1.676
3.284
5.428
8.108
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
1294.000
1868.000
2707.000
3272.000
4020.000
Tol.
(%)
± 30
± 30
± 30
± 30
± 30
± 30
± 30
± 30
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
DCR
(Ω)
Max.
0.0216
0.026
0.0306
0.0338
0.04
0.05
0.0656
0.0714
0.0921
0.129
0.192
0.265
0.353
0.469
0.578
0.701
1.013
1.38
2.172
3.3
4.888
5.896
7.202
Irms
(A)
8.94
7.74
6.77
6.23
5.23
4.13
3.67
3.16
3.02
2.51
2
1.61
1.47
1.22
1.04
0.98
0.796
0.645
0.522
0.427
0.38
0.325
0.307
Isat
(A)
28
20
15.6
12.7
10.8
8.24
6.67
6.09
5.6
4.83
3.78
3.11
2.64
2.22
2.03
1.82
1.51
1.22
1.01
0.838
0.697
0.633
0.571
Test Voltage ..................................0.25 V
Operating Temperature
................................-40 °C to +125 °C
(Temperature rise included)
Storage Temperature
................................-40 °C to +125 °C
Temperature Rise
.......................40 °C typ. at rated Irms
Inductance drop ...................30 % at Isat
Hi-pot (N1-N2) ................500 Vac/60 Hz,
3 mA, 1 sec
Moisture Sensitivity Level ..................... 1
ESD Classification (HBM)................. N/A
Materials
Core ..............................................Ferrite
Wire ............................Enameled copper
Terminal Finish ...................................Sn
Packaging .................... 400 pcs. per reel
Product Dimensions
12.50
MAX.
(.492)
DOT
INDICATES
TERMINAL 1
12.50
(.492)
MAX.
Electrical Schematic
1
2
N1
N2
3
4
1
2
N1
1
N2
3
4
2
N1
4
3
PARALLEL
8.00
MAX.
(.315)
N2
SERIES
5.00 ± 0.3
(.197 ± .012)
4
3
1
2
5.00 ± 0.3
(.197 ± .012)
Recommended Layout
4.50
(.177)
2.15
(.085)
1
1
2
4.50
(.177)
2.15
(.085)
2
13.00
(.512)
13.00
(.512)
4
3
1.28
(.050)
DUAL INDUCTOR MODE
4
3
DIMENSIONS:
MM
(INCHES)
1.28
(.050)
SERIES MODE
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.
DIMENSIONS:
1.80 ± 0.2
(.071 ± .008)
MM
(INCHES)
WARNING
Cancer and Reproductive Harm
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)
the Chlorine (Cl) content is 900 ppm or less; and (c)
the total Bromine (Br) and Chlorine (Cl) content is
1500 ppm or less.
SRF1280A Series - Dual-Winding Shielded Power Inductors
Inductance vs. IDC
SRF1280A-470M
50.0
SRF1280A-681M
L @ 25 °C
L @ 125 °C
30.0
L (µH)
L (µH)
40.0
20.0
SRF1280A-102M
L @ 125 °C
800.0
1200.0
600.0
900.0
L (µH)
L @ 25 °C
400.0
0.0
0.0
1.1
2.2
3.3
300.0
0.0
0.0
4.4
L @ 125 °C
600.0
200.0
10.0
L @ 25 °C
0.3
0.6
0.9
0.0
0.0
1.2
0.2
0.4
IDC (A)
IDC (A)
0.6
0.8
1.0
0.80
1.00
IDC (A)
Temperature Rise vs. IDC
SRF1280A-470M
100.0
SRF1280A-102M
ΔT @ 25 °C
100.0
80.0
60.0
60.0
60.0
ΔT (°C)
80.0
40.0
40.0
20.0
20.0
0.0
0.0
1.13
2.25
3.38
4.50
0.0
0.0
0.28
0.55
0.83
1.10
0.0
0.0
0.20
0.40
0.60
IDC (A)
IDC (A)
How to Order
Soldering Profile
Preheat Area
+4.0 °C / sec. max.
40.0
20.0
IDC (A)
Temperature
Rising Area
ΔT @ 25 °C
100.0
80.0
ΔT (°C)
ΔT (°C)
SRF1280A-681M
ΔT @ 25 °C
150~200 °C / 60~120 sec.
Reflow Area
SRF1280A - 100M
Forced Cooling Area
+3.0 °C / sec. max.
Model
-(1.0~5.0) °C / sec. max.
Value Code (see table)
250
Temperature (°C)
217 °C
Peak Temperature:
245 °C max.
60 ~ 150 sec.
60 sec. max.
200
150
Time Above 245 °C:
30 sec. max.
60 ~ 120 sec.
100
Time Above 217 °C:
60 ~ 150 sec. max.
50
0
50
100
150
200
250
Time (Seconds)
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.
SRF1280A Series - Dual-Winding Shielded Power Inductors
Packaging Specifications
2.0 ± 0.5
(.079 ± .020)
330
DIA.
(12.99)
21.0 ± 0.8
(.827 ± .031)
30.4
(1.197)
13.0 ± 0.5
(.512 ± .020)
DIA.
50.0 -0
(1.97 -0)
13.0
DIA.
(.512)
24.0
(.945)
26 +0
(1.024 +0)
20.0
(.787)
END
NO COMPONENT
4.0
(.157)
COMPONENTS
START
NO COMPONENT
400
(15.75)
200
(7.87)
USER DIRECTION OF FEED
QTY: 400 PCS. PER REEL
DIMENSIONS:
MM
(INCHES)
Asia-Pacific: Tel: +886-2 2562-4117 • Email: asiacus@bourns.com
EMEA: Tel: +36 88 885 877 • Email: eurocus@bourns.com
The Americas: Tel: +1-951 781-5500 • Email: americus@bourns.com
www.bourns.com
REV. 11/19
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.
Legal Disclaimer Notice
This legal disclaimer applies to purchasers and users of Bourns® products manufactured by or on behalf of Bourns, Inc. and
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Unless otherwise expressly indicated in writing, Bourns® products and data sheets relating thereto are subject to change
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