Temperature
(°C)
25
75
125
175
225
275
50 0 100 150 200 250 300
Time (seconds)
120 - 150 seconds
60 - 90
seconds
260°C peak
190°C
150°C
220°C
Ramp Down
6°C/second
maximum
<1> 255°C
<1> Maximum of 10 seconds between
+255°C and +260°C
Ramp Up
3°C/second maximum
10 seconds minimum
Rev. 02/22/05
Features
■ Height of 3.0 mm max.
■ Current rating up to 3.1 A
■ RoHS compliant*
Applications
■ Input/output of DC/DC converters
■ Power supplies for:
• Portable communication equipment
• Camcorders
• LCD TVs
SRR4028 Series - Shielded SMD Power Inductors
*RoHS COMPLIANT
Electrical Characteristics
Product Dimensions
Bourns
Part Number
Inductance
100 kHz Q
Ref.
Test
Frequency
(MHz)
SRF
Typ.
(MHz)
DCR
Max.
(mΩ)
I rms
(A)
I sat
(A)(μH) Tol. %
SRR4028-1R2Y 1.2 ±30 9.34 7.96 176 20 3.10 2.560
SRR4028-1R8Y 1.8 ±30 9.18 7.96 146 25 2.70 2.200
SRR4028-2R2Y 2.2 ±30 9.24 7.96 111 28 2.50 2.050
SRR4028-2R7Y 2.7 ±30 8.64 7.96 92 30 2.35 1.800
SRR4028-3R3Y 3.3 ±30 7.72 7.96 76 35 2.15 1.650
SRR4028-3R9Y 3.9 ±30 8.58 7.96 56 60 1.72 1.500
SRR4028-4R7Y 4.7 ±30 8.12 7.96 55 70 1.55 1.300
SRR4028-5R6Y 5.6 ±30 9.56 7.96 69 85 1.38 1.200
SRR4028-6R8Y 6.8 ±30 9.624 7.96 77 90 1.30 1.150
SRR4028-8R2Y 8.2 ±30 8.24 7.96 45 100 1.25 1.050
SRR4028-100Y 10 ±30 11.26 2.52 34 110 1.19 1.000
SRR4028-120Y 12 ±30 11.26 2.52 25 125 1.12 0.850
SRR4028-150Y 15 ±30 9.66 2.52 27 150 1.03 0.780
SRR4028-180Y 18 ±30 11.64 2.52 25 160 0.98 0.750
SRR4028-220Y 22 ±30 8.26 2.52 23 185 0.93 0.720
SRR4028-270Y 27 ±30 10.76 2.52 18 200 0.89 0.600
SRR4028-330Y 33 ±30 9.7 2.52 16 230 0.82 0.580
SRR4028-390Y 39 ±30 9.74 2.52 14 250 0.80 0.500
SRR4028-470Y 47 ±30 10.88 2.52 13 280 0.75 0.480
SRR4028-560Y 56 ±30 9 2.52 13 320 0.70 0.410
SRR4028-680Y 68 ±30 8.42 2.52 11 400 0.63 0.360
SRR4028-820Y 82 ±30 8.6 2.52 8 520 0.56 0.320
SRR4028-101Y 100 ±30 8.78 0.796 9 600 0.51 0.300
SRR4028-121Y 120 ±30 13.32 0.796 8 700 0.47 0.280
SRR4028-151Y 150 ±30 11.72 0.796 6 860 0.42 0.260
SRR4028-181Y 180 ±30 13.86 0.796 7 1000 0.39 0.230
SRR4028-221Y 220 ±30 11.3 0.796 5 1250 0.34 0.200
SRR4028-271Y 270 ±30 17.46 0.796 5 1500 0.32 0.180
SRR4028-331Y 330 ±30 16.48 0.796 5 1700 0.30 0.170
SRR4028-391Y 390 ±30 13.18 0.796 4 2200 0.26 0.160
SRR4028-471Y 470 ±30 13.26 0.796 3 2600 0.24 0.155
SRR4028-561Y 560 ±30 16.46 0.796 3 3000 0.22 0.150
Recommended Layout
DIMENSIONS: MM
(INCHES)
General Specifications
Test Voltage ................................... 0.1 V
Reflow Soldering ...230 °C, 50 sec. max.
Operating Temp. ............-40 °C to +125 °C
(Temperature rise included)
Storage Temperature .. -40 °C to +125 °C
Resistance to Soldering Heat
................................ 260 °C for 10 sec.
Moisture Sensitivity Level......................1
ESD Classification (HBM) ..................N/A
Materials
Core ............................................. Ferrite
Wire ........................... Enameled copper
Adhesive ............................... Epoxy resin
Terminal .................................... Ag/Ni/Sn
Rated Current
...................Ind. drop 35 % typ. at Isat
Temperature Rise ................... 30 °C typ.
at rated Irms
Packaging .................... 500 pcs. per reel
Soldering Profile
6R8
4.80 ± 0.20
(.189 ± .008)
4.80 ± 0.20
(.189 ± .008)
1.60
(.063)
TYP.
1.60
(.063)
TYP.
1.60
(.063)
TYP.
2.80 ± 0.20
(.110 ± .008)
5.30
(.209) 2.00
(.079)
REF.
1.50
(.059)
REF.
2.00
(.079)
REF.
1.80
(.071)
REF.
REF.
R
*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. 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.
WARNING Cancer and Reproductive Harm
www.P65Warnings.ca.gov
14.0 + 0
(.551 + 0)
16.5
(.650)
2.0 ± 0.5
(.079 ± .020)
50.0 - 0
(1.969 - 0)
178.0
(7.00)
DIA.
13.0
(.511) DIA.
13.0
(.511)
DIA.
21.0 ± 0.8
(.827 ± .032)
START
END
4.0
(.157)
8.0
(.315)
200
(7.87)
NO COMPONENT NO COMPONENT
COMPONENTS 400
(15.75)
USER DIRECTION OF FEED
6R8 6R86R86R8
SRR4028 Series - Shielded SMD Power Inductors
REV. 03/18
DIMENSIONS: MM
(INCHES)
QTY: 500 PCS. PER REEL
Electrical SchematicInductance vs. Current
10123 5710
223 57
DC Current (mA)
Inductance (μH)
103104
23 57
100
7
101
7
5
3
2
102
7
5
3
2
7
5
3
2
1R2
100
4R7
330
151
561
LCR METER
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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and complete before placing orders for Bourns® products.
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*9
