Features
Applications
■ Height of 3.0 mm max.
■ Current rating up to 3.1 A
■ RoHS compliant*
■ Input/output of DC/DC converters
■ Power supplies for:
• Portable communication equipment
• Camcorders
• LCD TVs
• Car radios
SRR4028 Series - Shielded SMD Power Inductors
General Specifications
Electrical Specifications
Test Voltage .....................0.1 V, 100 KHz
Reflow Soldering.....230 ˚C; 50 sec max.
Operating Temperature ..-40 °C to +125 °C
(Temperature rise included)
Storage Temperature..-40 °C to +125 °C
Resistance to Soldering Heat
................................260 °C for 10 sec.
Inductance 100 kHz
Test
Frequency
(MHz)
SRF
Typ.
(MHz)
DCR
Max.
(mΩ)
20
25
28
30
35
60
70
85
Q
Ref.
Bourns Part No.
Irms
(A)
Isat
(A)
(µH)
1.2
1.8
2.2
2.7
3.3
3.9
4.7
5.6
6.8
8.2
10
Tol. %
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
SRR4028-1R2Y
SRR4028-1R8Y
SRR4028-2R2Y
SRR4028-2R7Y
SRR4028-3R3Y
SRR4028-3R9Y
SRR4028-4R7Y
SRR4028-5R6Y
SRR4028-6R8Y
SRR4028-8R2Y
SRR4028-100Y
SRR4028-120Y
SRR4028-150Y
SRR4028-180Y
SRR4028-220Y
SRR4028-270Y
SRR4028-330Y
SRR4028-390Y
SRR4028-470Y
SRR4028-560Y
SRR4028-680Y
SRR4028-820Y
SRR4028-101Y
SRR4028-121Y
SRR4028-151Y
SRR4028-181Y
SRR4028-221Y
SRR4028-271Y
SRR4028-331Y
SRR4028-391Y
SRR4028-471Y
SRR4028-561Y
9.34
9.18
9.24
8.64
7.72
8.58
8.12
9.56
9.624
8.24
11.26
11.26
9.66
11.64
8.26
10.76
9.7
9.74
10.88
9
8.42
8.6
8.78
13.32
11.72
13.86
11.3
17.46
16.48
13.18
13.26
16.46
7.96
7.96
7.96
7.96
7.96
7.96
7.96
7.96
7.96
7.96
2.52
2.52
2.52
2.52
2.52
2.52
2.52
2.52
2.52
2.52
2.52
2.52
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
176
146
111
92
76
56
55
69
77
45
34
25
27
25
23
18
16
14
13
13
11
8
3.10 2.560
2.70 2.200
2.50 2.050
2.35 1.800
2.15 1.650
1.72 1.500
1.55 1.300
1.38 1.200
1.30 1.150
1.25 1.050
1.19 1.000
1.12 0.850
1.03 0.780
0.98 0.750
0.93 0.720
0.89 0.600
0.82 0.580
0.80 0.500
0.75 0.480
0.70 0.410
0.63 0.360
0.56 0.320
0.51 0.300
0.47 0.280
0.42 0.260
0.39 0.230
0.34 0.200
0.32 0.180
0.30 0.170
0.26 0.160
0.24 0.155
0.22 0.150
Materials
Core Material.................................Ferrite
Wire ............................Enameled Copper
Adhesive..............................Epoxy Resin
Terminal.....................................Ag/Ni/Sn
Rated Current .........Ind. drop of 35 % typ.
at Isat
90
100
110
125
150
160
185
200
230
250
280
320
400
520
600
700
860
1000
1250
1500
1700
2200
2600
3000
Temperature Rise.............30 ˚C typ. at Irms
Packaging.....................500 pcs. per reel
12
15
18
22
27
33
39
47
Product Dimensions
4.80 0.ꢀ0
(.189 .008ꢁ
4.80 0.ꢀ0
(.189 .008ꢁ
6R8
56
68
82
100
120
150
180
220
270
330
390
470
560
9
8
6
7
5
5
5
4
ꢀ.80 0.ꢀ0
(.110 .008ꢁ
1.60
(.063ꢁ
TYP.
3
3
TYP.
1.60
(.063ꢁ
1.60
(.063ꢁ
TYP.
Soldering Profile
275
<1> Maximum of 10 seconds between
+255°C and +260°C
260°C peak
<1> 255°C
220°C
Recommended Layout
225
175
125
75
5.30
(.ꢀ09ꢁ
ꢀ.00
(.079ꢁ
REF.
REF.
Ramp Down
6°C/second
maximum
190°C
60 - 90
seconds
150°C
1.80
(.071ꢁ
REF.
R
REF.
1.50
(.059ꢁ
120 - 150 seconds
10 seconds minimum
ꢀ.00
(.079ꢁ
REF.
Ramp Up
3°C/second maximum
MM
(INCHES)
DIMENSIONS:
25
0
50
100
150
200
250
300
Rev. 02/22/05
Time (seconds)
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
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