PL
IA
NT
Features
7.6
MAX.
(.299)
Applications
n
SEPIC topology
n
Power supplies for:
C
OM
n
Multiple applications: parallel, series,
101
F
RE
E
dual-inductor and transformer
n
Magnetically shielded, low radiation
n
Inductance range: 0.47 to 4000 μH
7.6
(.299)
n
Rated current up to 17.9 A
MAX.
n
RoHS compliant*
*R
oH
S
- Communication equipment
- Notebooks, desktop computers,
servers
- LCDs, flat panels, backlights
- Camcorders, HDTVs
LE
AD
SRF1280 Series - Dual-Winding Shielded Power Inductors
3.4 ± 0.2
(.134 ± .008)
Electrical Specifications @ 25 °C
Parallel Rating
Bourns
Part No.
Inductance
@ 100 KHz
General Specifications
3
2.9
TYP.
(.114)
L (μH)
Tol.
(%)
DCR
4
(W)
Max.
Series Rating
Inductance
@ 100 KHz
Irms
(A)
Isat
(A)
L (μH)
Tol.
(%)
DCR
(W)
Max.
Irms
(A)
Isat
(A)
SRF1280-R47Y
0.47
±30 0.0055 17.9
56
1.88
±30
2.7
(.106)
SRF1280-1R0Y
1.0
±30 0.0067 15.5
40
4
±30
TYP.
SRF1280-1R5Y
1.5
±30 0.0076 13.5 31.1
6
±30
SRF1280-2R2Y
2.2
±30 0.0092 12.5 25.5
8.8
±30
SRF1280-3R3Y
3.3
±30 0.011 10.4 21.5
13.2
±30
1
2
1.0
SRF1280-4R7Y
4.7
±30 0.0135 8.25 16.5
18.8
±30
TYP.
(.039)
SRF1280-6R8Y
6.8
±30 0.0183 7.34 13.3
27.2
±30
SRF1280-8R2Y
8.2
±30 0.0191 6.32 12.2
32.8
±30
SRF1280-100M
10
±20 0.0241 6.04 11.2
40
±20
SRF1280-150M
15
±20 0.0333 5.03 9.66
60
±20
12.50
0.4
0.4
3.0
MAX.
7.57
SRF1280-220M
22
±20 0.0503
4
88
±20
(.492)
(.016)
(.016)
(.118)
SRF1280-330M
33
±20 0.0664 3.23 6.22
132
±20
DOT
SRF1280-470M
47
±20 0.0898 2.95 5.28
188
±20
2
2
1
1
INDICATES
SRF1280-680M
68
TERMINAL 1
0.123 2.44 4.44
±20
272
±20
12.50
328
SRF1280-820M
82
±20 0.153
7.9
2.09 4.06
±20
(.492)
(.311)
SRF1280-101M
100
±20 0.175 1.96 3.64
MAX.
400
±20
SRF1280-151M
150
±20 0.261 1.59 3.01
600
4
4
3
3
±20
SRF1280-221M
220
±20 0.343 1.29 2.43
880
±20
1.4
1.4
SRF1280-331M
(.055)
330
±20
0.54
1.04
(.055)
2.01
1320
±20
SRF1280-471M
470
INDUCTOR MODE
1880
±20
DUAL
±20 0.865 0.85 1.68
SERIES MODE
SRF1280-681M
680
±20 1.296 0.76 1.39
2720
±20
8.00
SRF1280-821M
820
±20 1.632 0.65 1.27
(.315) MAX.
±20
3280
SRF1280-102M
1000
±20 1.992 0.61 1.14
4000
±20
0.0216
0.026
0.0306
0.0338
0.04
0.05
0.0656
0.0714
0.0921
0.129
3.0
0.192
(.118)
0.265
0.353
0.469
7.9
0.578
(.311)
0.701
1.013
1.38
2.172
3.3
4.888
5.896
7.202
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
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
Hi-pot ................500 Vrms, 3 mA, 3 sec.
Reflow Soldering .. 230 °C; 50 sec. max.
Operating Temperature
................................. -40 °C to +105 °C
(Temperature rise included)
Storage Temperature .. -40 °C to +125 °C
Resistance to Solder Heat
...............................+260 °C for 10 sec.
Moisture Sensitivity Level ...................... 1
ESD Classification (HBM) .................. N/A
Materials
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
How to Order
Model
Value Code (see table)
Ro VE LEA
HS RS D
C ION FRE
OM S E
PL AR
IA E
NT
*
SRF1280 - 100M
Electrical Schematic
1
5.00 ± 0.3
(.197 ± .012)
2
4
1
3
5.00 ± 0.3
(.197 ± .012)
Product Dimensions
12.50
MAX.
(.492)
2
1
2
DOT
INDICATES
TERMINAL 1
N1
N2
N1
1
2
N2
N1
N2
12.50
(.492)
MAX.
3
4
3
1.80 ± 0.2
4
(.071 ± .008)
3
4
PARALLEL
SERIES
4.50
(.177)
8.00
MAX.
(.315)
Recommended Layout
2.15
(.085)
4.50
(.177)
2.15
(.085)
1
2
13.00
(.512)
1
2
13.00
(.512)
5.00 ± 0.3
(.197 ± .012)
4
3
5.00 ± 0.3
(.197 ± .012)
4
1.28
(.050)
3
4
1.28
(.050)
3
DUAL INDUCTOR MODE
SERIES MODE
1
2
*RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
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.
2.15
(.085)
1.80 ± 0.2
(.071 ± .008)
MM
DIMENSIONS:
(INCHES)
4.50
(.177)
2.15
(.085)
4.50
(.177)
SRF0504 Series - Line Filter
SRF1280 Series - Dual-Winding Shielded Power Inductors
Packaging Specifications
330
DIA.
(12.99)
2.0 ± 0.5
(.079 ± .020)
30.4
(1.197)
13.0 ± 0.5
(.512 ± .020)
DIA.
50.0 -0
(1.97 -0)
21.0 ± 0.8
(.827 ± .031)
13.0
DIA.
(.512)
26 +0
(1.024 +0)
16.0
(.630)
24.0
(.945)
END
4.0
(.157)
START
NO COMPONENT
200
(7.87)
COMPONENTS
NO COMPONENT
400
(15.75)
USER DIRECTION OF FEED
QTY: 400 PCS. PER REEL
MM
DIMENSIONS:
(INCHES)
Asia-Pacific:
Tel: +886-2 2562-4117 • Email: asiacus@bourns.com
EMEA:
Tel: +36 88 520 390 • Email: eurocus@bourns.com
The Americas:
Tel: +1-951 781-5500 • Email: americus@bourns.com
www.bourns.com
REV. 03/18
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.
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