Document 184-1
Midi Spring Air Core Inductors
®
This family of surface mount Midi Spring
®
inductors is
designed for higher current applications (up to 3.5 Amps)
than our smaller series. It also provides higher Q factors
at lower frequencies.
Like all Coilcraft “spring” inductors, these parts provide
the advantages of an air core inductor in a package
optimized for auto placement. The top of the coil is
capped with acrylic, forming a flat surface and assuring
mechanical stability. The leads are solder coated for
reliable soldering.
Coilcraft
Designer’s Kit C118
contains samples of all
5% inductance tolerance parts. Kits with 2% tolerance
are also available. To order, contact Coilcraft or visit
http://order.coilcraft.com.
Part
Inductance
2
Percent
number
1
(nH)
tolerance
3
1812SMS-22N_
22
5,2
1812SMS-27N_
27
5,2
1812SMS-33N_
33
5,2
5,2
1812SMS-39N_
39
1812SMS-47N_
47
5,2
1812SMS-56N_
1812SMS-68N_
1812SMS-82N_
1812SMS-R10_
1812SMS-R12_
56
68
82
100
120
5,2
5,2
5,2
5,2
5,2
Q
2
typ
135
135
130
135
135
125
120
120
115
125
Q
2
min
100
100
100
100
100
100
100
100
100
100
Test SRF
4
DCR
5
Irms
6
freq.
min
max max
(MHz) (GHz) (mOhm) (A)
150
3.2
4.2
3.0
150
2.7
4.0
3.5
150
2.5
4.8
3.0
150
2.1
4.4
3.0
150
2.1
5.6
3.0
150
150
150
150
150
1.5
1.5
1.3
1.2
1.1
6.2
8.2
9.4
12.3
17.3
3.0
2.5
2.5
1.7
1.5
1. When ordering, please add letter to specify
inductance tolerance:
J=5%, G=2%.
2. Inductance and Q tested on the Agilent/
HP 4291A with the 16193 fixture and
correlation.
3. Tolerances in bold are stocked for immediate
shipment.
4. SRF tested on the Agilent/HP 8753D and the
SMD-D test fixture.
5. DCR tested on the Cambridge Technology
Model 510 Micro-ohmmeter.
6. Average current for a 15°C rise above 25°C
ambient.
7. Operating temperature range -40°C to
+125°C.
8. Electrical specifications at 25°C.
See Qualification Standards section for
environmental and test data
Encapsulant
A
D
E
Recommended
Land Pattern
Strip
Length
135°
max
F
0.058
1,48
0.103
2,62
0.203
5,16
C
B
A max
0.195
4,95
B max
0.250
6,35
C max
0.165
4,20
D
0.140 ±0.010
3,56 ±0,25
E
0.170 ±0.015
4,32 ±0,38
F max
0.030
0,76
0° min
0.112
2,85
0.228
5,80
Weight:
0.10 – 0.16 g
Terminations:
Tin/lead over copper
Tape and reel:
500/7″ reel; 2000/13″ reel 12 mm tape width
For packaging data see Tape and Reel Specifications section.
Specifications subject to change without notice.
Please check our website for latest information.
Document 184-1
Revised 12/17/04
© Coilcraft, Inc. 2005
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