7.6
MAX.
(.299)
Features
Applications
n Multiple applications: parallel, series,
n SEPIC topology
dual-inductor and transformer
n Magnetically shielded, low radiation
7.6
n Inductance
range: 0.47 to 4000 μH
(.299)
MAX. current up to 17.9 A
n Rated
n RoHS compliant*
101
n Power supplies for:
- Communication equipment
- Notebooks, desktop computers,
servers
- LCDs, flat panels, backlights
- Camcorders, HDTVs
SRF1280 Series - Dual-Winding Shielded Power Inductors
3.4 ± 0.2
(.134 ± .008)
Electrical Specifications @ 25 °C
Additional Information
Parallel Rating
4
Inductance
@ 100 KHz
Bourns
Part No.
DCR
(W)
Max.
Tol.
(%)
L (mH)
3
2.9
TYP.
(.114)
Irms
(A)
Inductance
@ 100 KHz
Isat
(A)
DCR
(W)
Max.
Tol.
(%)
L (mH)
SRF1280-R47Y
0.47 2.7 ±30 0.0055 17.9 56
1.88
±30 0.0216
(.106)
SRF1280-1R0Y
1.0 TYP.±30 0.0067 15.5 40
4
±30 0.026
SRF1280-1R5Y
1.5
±30 0.0076 13.5 31.1
6
±30 0.0306
SRF1280-2R2Y
2.2
±30 0.0092 12.5 25.5
8.8
±30 0.0338
SRF1280-3R3Y
3.3
±30 0.011
10.4
13.2
±30 0.04
1
2 1.021.5
TYP.
SRF1280-4R7Y
4.7
±30 0.0135 8.25(.039)
16.5
18.8
±30 0.05
SRF1280-6R8Y
6.8
±30 0.0183 7.34 13.3
27.2
±30 0.0656
SRF1280-8R2Y
8.2
±30 0.0191 6.32 12.2
32.8
±30 0.0714
SRF1280-100M
10
±20 0.0241 6.04 11.2
40
±20 0.0921
SRF1280-150M
15
±20 0.0333 5.03 9.66
60
±20 0.129
0.4
0.4
3.0 12.50
3.0
SRF1280-220M (.016)
22
±20 0.0503
4 MAX.
7.57
88
±20 (.118)
0.192
(.016)
(.118) (.492)
SRF1280-330M
33
±20 0.0664 3.23 6.22
132
±20 0.265
DOT20.0898 2.95 5.28
2±20 0.353
147
1
SRF1280-470M
±20
188
INDICATES
SRF1280-680M
68
±20
0.123
2.44
4.44
272
±20 0.469
TERMINAL 1
7.9
7.9
12.50
SRF1280-820M
82
±20 0.153
328
±20 (.311)
0.578
(.311) 2.09 4.06
(.492)
SRF1280-101M
100
±20 0.175 1.96 3.64
400
±20 0.701
MAX.
4150
4
3±20 1.013
SRF1280-151M
±20 30.261 1.59 3.01
600
SRF1280-221M1.4 220
±20 0.343 1.29 1.42.43
880
±20 1.38
(.055)
SRF1280-331M
330
±20
0.54 1.04(.055)
2.01
1320
±20 2.172
DUAL
SRF1280-471M
470 INDUCTOR
±20 MODE
0.865 0.85 1.68 SERIES
1880 MODE±20
3.3
SRF1280-681M
680
±20 1.296 0.76 1.39
2720
±20 4.888
8.00
MAX.
(.315) ±20 5.896
SRF1280-821M
820
±20 1.632 0.65 1.27
3280
SRF1280-102M
1000
±20 1.992 0.61 1.14
4000
±20 7.202
Electrical Schematic
1
2
N1
5.00 ± 0.3
1
(.197 ± .012)
N2
3
4
3
4
1
2
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
1
N2
3
Irms
(A)
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
PRODUCT TECHNICAL INVENTORY SAMPLES
LIBRARY
CONTACT
General Specifications
Test Voltage...................................0.25 V
Hi-pot..................500 Vrms, 3 mA, 3 sec.
Operating Temperature
.................................. -40 °C to +125 °C
(Temperature rise included)
Storage Temperature... -40 °C to +125 °C
Moisture Sensitivity Level....................... 1
ESD Classification (HBM)................... N/A
Product Dimensions
12.50
MAX.
(.492)
DOT
INDICATES
TERMINAL 1
12.50
(.492)
MAX.
5.00 ± 0.3
(.197 ± .012)
2
N1
Click these links for more information:
Series Rating
N1
4 ± 0.2
1.80
(.071 ± .008)
8.00
MAX.
(.315)
2
N2
5.00 ± 0.3
(.197 ± .012)
4
3
PARALLEL
4
3
1
2
5.00 ± 0.3
(.197 ± .012)
SERIES
Recommended Layout
4.50
(.177)
2.15
(.085)
1
1
2
4.50
(.177)
2.15
(.085)
2
4
3
1.28
(.050)
DUAL INDUCTOR MODE
WARNING
Cancer and Reproductive Harm
www.P65Warnings.ca.gov
DIMENSIONS:
13.00
(.512)
13.00
(.512)
4
3
1.28
(.050)
4.50
(.177)
2.15
(.085)
1
SERIES MODE
1.80 ± 0.2
(.071 ± .008)
MM
(INCHES)
1
2
4.50
(.177)
2.15
(.085)
2
13.00
(.512)
13.00
(.512)
*RoHS Directive 2015/863, Mar 31, 2015 and Annex. 4
4
3
3
Specifications are subject to change without notice. Users should verify actual device performance in their specific
1.28
1.28
applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the
(.050)
(.050)
last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
DUAL INDUCTOR MODE
SERIES MODE
SRF1280 Series - Dual-Winding Shielded Power Inductors
Materials
How to Order
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
SRF1280 - 100M
Model
Value Code (see table)
Packaging Specifications
330
DIA.
(12.99)
2.0 ± 0.5
(.079 ± .020)
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)
16.0
(.630)
END
NO COMPONENT
200
(7.87)
4.0
(.157)
COMPONENTS
START
NO COMPONENT
400
(15.75)
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. 04/21
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
P[ZHɉSPH[LZJVSSLJ[P]LS`¸)V\YUZ¹
Unless otherwise expressly indicated in writing, Bourns® products and data sheets relating thereto are subject to change
^P[OV\[UV[PJL
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