PL
IA
N
T
Features
n
Height of 3.0 mm max.
n
Current rating up to 3.1 A
n
RoHS compliant*
Applications
n
Input/output of DC/DC converters
n
Power supplies for:
•
Portable communication equipment
•
Camcorders
•
LCD TVs
*R
oH
S
C
OM
LE
AD
F
RE
E
SRR4028 Series - Shielded SMD Power Inductors
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
Product Dimensions
4.80 ± 0.20
(.189 ± .008)
4.80 ± 0.20
(.189 ± .008)
Electrical Characteristics
Ro VE LEA
HS RS D
C ION FRE
OM S E
PL AR
IA E
NT
*
Bourns
Part Number
Inductance
100 kHz
(µH)
Tol. %
Q
Ref.
Test
Frequency
(MHz)
SRF
Typ.
(MHz)
DCR
Max.
(mW)
I rms
(A)
I sat
(A)
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
1.2
1.8
2.2
2.7
3.3
3.9
4.7
5.6
6.8
8.2
10
12
15
18
22
27
33
39
47
56
68
82
100
120
150
180
220
270
330
390
470
560
±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
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
9
8
6
7
5
5
5
4
3
3
20
25
28
30
35
60
70
85
90
100
110
125
150
160
185
200
230
250
280
320
400
520
600
700
860
1000
1250
1500
1700
2200
2600
3000
3.10
2.70
2.50
2.35
2.15
1.72
1.55
1.38
1.30
1.25
1.19
1.12
1.03
0.98
0.93
0.89
0.82
0.80
0.75
0.70
0.63
0.56
0.51
0.47
0.42
0.39
0.34
0.32
0.30
0.26
0.24
0.22
2.560
2.200
2.050
1.800
1.650
1.500
1.300
1.200
1.150
1.050
1.000
0.850
0.780
0.750
0.720
0.600
0.580
0.500
0.480
0.410
0.360
0.320
0.300
0.280
0.260
0.230
0.200
0.180
0.170
0.160
0.155
0.150
6R8
6R8
4.80 ± 0.20
(.189 ± .008)
4.80 ± 0.20
(.189 ± .008)
2.80 ± 0.20
(.110 ± .008)
2.80 ± 0.20
(.110 ± .008)
1.60
(.063)
1.60
TYP.
(.063)
TYP.
Soldering Profile
275
<1> Maximum of 10 seconds between
+255°C and +260°C
225
220°C
190°C
60 - 90
seconds
Ramp Down
6°C/second
maximum
260°C peak
<1> 255°C
TYP.
1.60
TYP.
(.063)
1.60
(.063)
1.60
(.063)
1.60
TYP.
(.063)
TYP.
Temperature (°C)
175
150°C
125
Recommended Layout
120 - 150 seconds
10 seconds minimum
75
Ramp Up
3°C/second maximum
5.30
REF.
(.209)
5.30
REF.
(.209)
1.80
(.071)
1.80
R REF.
(.071)
REF.
R
2.00
(.079)
2.00
REF.
(.079)
REF.
25
0
50
100
150
200
250
Rev. 02/22/05
300
Time (seconds)
*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.
MM
DIMENSIONS:
(INCHES)
REF.
1.50
REF.
(.059)
1.50
(.059)
2.00
(.079)
2.00
REF.
(.079)
REF.
TYP.
1.60
(.063)
1.60
(.063)
TYP.
5.30
REF.
(.209)
2.00
(.079)
REF.
SRR4028 Series - Shielded SMD Power Inductors
Inductance vs. Current
7
5
3
2
102
7
5
3
2
101
7
5
3
2
100
7
101
2
R
1.80
(.071)
REF.
REF.
1.50
(.059)
2.00
(.079)
REF.
Electrical Schematic
561
151
Inductance ( H)
330
100
4R7
LCR METER
1R2
3
5
7 102
2
3
5
7 103
2
3
5
7 104
DC Current (mA)
Packaging Specifications
178.0
(7.00)
DIA.
178.0
2.0
±
(7.00)0.5
(.079
±
.020)
DIA.
2.0
±
0.5
(.079
±
.020)
16.5
(.650)
16.5
(.650)
21.0
±
0.8
(.827
±
.032)
21.0
±
0.8
(.827
±
.032)
DIA.
13.0
(.511)
DIA.
13.0
(.511)
50.0 - 0
(1.969 - 0)
13.0
DIA.
(.511)
13.0
DIA.
(.511)
50.0 - 0
(1.969 - 0)
14.0 + 0
(.551 + 0)
END
END
14.0 + 0
(.551 + 0)
8.0
(.315)
8.0
(.315)
4.0
(.157)
4.0
(.157)
START
START
6R8
6R8
6R8
6R8
6R8
6R8
6R8
6R8
NO COMPONENT
NO COMPONENT
200
(7.87)
200
(7.87)
NO COMPONENT
COMPONENTS
COMPONENTS
NO COMPONENT
USER DIRECTION OF FEED
USER DIRECTION OF FEED
QTY: 500 PCS. PER REEL
400
(15.75)
400
(15.75)
MM
DIMENSIONS:
(INCHES)
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.
REV. 03/18
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