Document 225-1
1812LS Chip Inductors for xDSL Filters
The 0.055″ profile makes these parts ideal for low clearance
applications. Simple construction ensures high reliability
and stability.
Coilcraft offers a library of reference designs for various
xDSL filters using these and other surface mount compo-
Inductance
2
(µH)
12
15
18
22
27
33
39
47
56
68
82
100
120
150
180
220
270
330
390
470
560
680
820
1000
Percent
tolerance
3
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
10,5
nents. We can also provide several complete low pass
and band pass filter modules in space-saving SIP con-
figurations.
For free evaluation samples or more information, please
contact Coilcraft or visit
www.coilcraft.com/xdsl.
Test
freq
(MHz)
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
0.79
0.79
0.79
0.79
0.79
0.79
0.79
0.79
0.79
0.79
0.79
0.79
SRF
min
5
(MHz)
55
45
37
32
27
23
19
16
13
10
9.0
8.5
8.5
8.5
8.0
6.0
5.0
4.5
3.5
3.0
2.0
1.9
1.6
1.5
DCR
max
6
(Ohms)
2.0
2.5
2.8
3.2
3.6
4.0
4.5
5.0
5.5
6.0
7.0
8.0
11.5
13.0
14.2
16.2
20.5
22.5
24.5
26.5
28.5
38.0
41.0
44.0
Part number
1812LS-123X_B_
1812LS-153X_B_
1812LS-183X_B_
1812LS-223X_B_
1812LS-273X_B_
1812LS-333X_B_
1812LS-393X_B_
1812LS-473X_B_
1812LS-563X_B_
1812LS-683X_B_
1812LS-823X_B_
1812LS-104X_B_
1812LS-124X_B_
1812LS-154X_B_
1812LS-184X_B_
1812LS-224X_B_
1812LS-274X_B_
1812LS-334X_B_
1812LS-394X_B_
1812LS-474X_B_
1812LS-564X_B_
1812LS-684X_B_
1812LS-824X_B_
1812LS-105X_B_
1
Q
min
4
42
42
45
45
45
45
45
42
42
40
40
40
33
36
36
38
38
38
38
38
33
33
30
30
Irms
7
(mA)
310
290
270
260
240
230
210
200
190
180
170
150
135
125
120
115
105
100
90
85
75
60
55
50
1. Specify
tolerance
and
packaging
codes:
1812LS-105XJBC
Tolerance: J
= 5%
K
= 10%
(Table shows stock tolerances in bold.)
Packaging: C
= 7″ machine-ready reel. EIA-481 embossed plastic
tape (600 per full reel).
B
= Less than full reel. In tape, but not machine-ready. To
have a leader and trailer added ($25 charge), use
code letter C instead.
D
= 13″ machine-ready reel. EIA-481 embossed plastic
tape. Factory order only, not stocked (2200 per full reel).
2. Inductance at 2.5 MHz measured using Agilent/HP 4286A and Coilcraft
SMD-A fixture with Coilcraft-provided correlation pieces. Inductance at
0.79 MHz measured using Agilent/HP 4192A and Coilcraft SMD-B test
fixture.
3. Tolerances in bold are stocked for immediate shipment.
4. Q read directly on Agilent/HP 4192A LF impedance analyzer and
Coilcraft SMD-B test fixture.
5. SRF measured using Agilent/HP 8753D network analyzer and Coilcraft
SMD-D test fixture.
6. DCR measured on Cambridge Technology micro-ohmmeter.
7. Average current for 15°C temperature rise from 25°C.
8. Operating temperature range
−40°C
to +85°C.
9. Electrical specifications at 25°C.
See Qualification Standards section for environmental and test data.
See Color Coding section for part marking data.
Specifications subject to change without notice.
Document 225-1
Revised 12/18/02
Document 225-2
1812LS (4532) Chip Inductors
Typical Q vs Frequency
60
50
270 µH
Typical L vs Current
10000
12 µH
18 µH
33 µH
1000 µH
Inductance (uH)
40
82 µH
560 µH
1000 µH
1000
330 µH
Q Factor
30
20
10
100 µH
100
33 µH
2.5 MHz
0.79 MHz
12 µH
0
0.1
0.2 0.3 0.4
0.6
1
2
3
4
5 6
8 10
10
1
10
Frequency (MHz)
100
DC Current (mA)
1000
B
overall
F
C
I
J
H
A
G
F
E
terminal
D
Terminal wraparound:
approx 0.015/0,38 both ends
I
Recommended
Land Pattern
G
H
3,05
I
1,14
J
0.118
3,00
A max B max C max
0.195
4,95
0.150
3,81
0.135
3,43
D ref
0.070
1,78
E
0.100
2,54
F
0.025
0,64
0.128 0.120 0.045
3,25
Parts/reel: 7″ 600; 13″ 2200 Tape width: 12 mm
For packaging data see Tape and Reel Specifications section.
Specifications subject to change without notice.
Document 225-2
Revised 12/18/02
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