Features
■ Multiple applications: parallel, series,
dual-inductor and transformer
■ Magnetically shielded, low radiation
■ Inductance range: 0.47 to 4000 μH
■ Rated current up to 17.9 A
■ AEC-Q200 qualifi ed
■ RoHS compliant* and halogen free**
Applications
■ Automotive systems:
- Driver assistant - Entertainment
- Information - Lighting
■ DC/DC converters
■ Power supplies
■ 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 Specifi cations @ 25 °C General Specifi cations
Core ..............................................Ferrite
Wire ............................Enameled copper
Terminal Finish ...................................Sn
Packaging .................... 400 pcs. per reel
Materials
Product Dimensions
*RoHS COMPLIANT
& AEC-Q200 QUALIFIED
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 defi nition 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.
Specifi cations 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 specifi c applications.
Bourns
Part No.
Parallel Rating Series Rating
Inductance
@ 100 KHz
L (μH)
Tol.
(%)
DCR
(Ω)
Max.
Irms
(A)
Isat
(A)
Inductance
@ 100 KHz
L (μH)
Tol.
(%)
DCR
(Ω)
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)
43
12
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
(.204)
4.50
(.204)
13.00
(.512)
13.00
(.512)
Recommended Layout
Electrical Schematic
DIMENSIONS: MM
(INCHES)
N2
2
4
N1
1
3
N2
2
4
N1
1
3
N2
2
4
N1
1
3
PARALLEL SERIES
10 1
Soldering Profi le
Peak Temperature:
245 °C max.
Time Above 245 °C:
30 sec. max.
Time Above 217 °C:
60 ~ 150 sec. max.
250
Temperature (°C)
050
50
200
150
100
+4.0 °C / sec. max. 150~200 °C / 60~120 sec. +3.0 °C / sec. max. -(1.0~5.0) °C / sec. max.
Temperature
Rising Area Preheat Area Reflow Area Forced Cooling Area
200
Time (Seconds)
100 150
60 ~ 150 sec.
60 sec. max.
217 °C
60 ~ 120 sec.
250
SRF1280A Series - Dual-Winding Shielded Power Inductors
Specifi cations 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 specifi c applications.
Inductance vs. IDC
3.3 4.42.21.10.0
3.38 4.502.251.130.0
IDC (A)
L (µH)
IDC (A)
ΔT (°C)
L @ 25 °C L @ 125 °C
ΔT @ 25 °C
0.0
20.0
40.0
60.0
80.0
100.0
0.0
10.0
20.0
30.0
40.0
50.0
0.0
200.0
400.0
600.0
800.0
0.9 1.20.60.30.0
0.280.0 0.55 1.100.83
IDC (A)
L (µH)
IDC (A)
ΔT (°C)
L @ 25 °C L @ 125 °C
ΔT @ 25 °C
0.0
20.0
40.0
60.0
80.0
100.0
0.0
1200.0
300.0
600.0
900.0
0.40.20.0
0.200.0 0.600.40 0.80 1.00
0.8 1.00.6
IDC (A)
L (µH)
IDC (A)
ΔT (°C)
L @ 25 °C L @ 125 °C
ΔT @ 25 °C
0.0
20.0
40.0
60.0
80.0
100.0
SRF1280A-102M
SRF1280A-681M
SRF1280A-470M
SRF1280A-102M
SRF1280A-681M
SRF1280A-470M
Temperature Rise vs. IDC
3312 - 2 mm SMD Trimming Potentiometer SRF1280A Series - Dual-Winding Shielded Power Inductors
Specifi cations 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 specifi c applications.
Packaging Specifi cations
11/14
USER DIRECTION OF FEED
200
(7.87)
NO COMPONENT NO COMPONENTCOMPONENTS
400
(15.75)
START
4.0
(.157)
20.0
(.787)
END
DIMENSIONS: MM
(INCHES)
QTY: 400 PCS. PER REEL
24.0
(.945)
26 +0
(1.024 +0)
30.4
(1.197)
2.0 ± 0.5
(.079 ± .020)
50.0 -0
(1.97 -0)
330
(12.99)DIA.
13.0
(.512) DIA.
13.0 ± 0.5
(.512 ± .020)
DIA.
21.0 ± 0.8
(.827 ± .031)
Asia-Pacifi c: Tel: +886-2 2562-4117 • Fax: +886-2 2562-4116
EMEA: Tel: +36 88 520 390 • Fax: +36 88 520 211
The Americas: Tel: +1-951 781-5500 • Fax: +1-951 781-5700
www.bourns.com
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Bourns:
SRF1280A-821M SRF1280A-8R2Y SRF1280A-220M SRF1280A-151M SRF1280A-6R8Y SRF1280A-1R5Y
SRF1280A-100M SRF1280A-330M SRF1280A-471M SRF1280A-1R0Y SRF1280A-221M SRF1280A-102M
SRF1280A-331M SRF1280A-101M SRF1280A-4R7Y SRF1280A-820M SRF1280A-681M SRF1280A-680M
SRF1280A-2R2Y SRF1280A-470M SRF1280A-3R3Y SRF1280A-R47Y SRF1280A-150M SRF1280A-652Y
