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Midi Spring®

Air Core Inductors

Our Midi Spring® air core inductors have exceptionaly high Q factors and very tight inductance tolerances, making them suitable for narrowband RF amplifier matching and tuning applications. As their name implies, air core inductors do not use a magnetic core, resulting in high Q and the lowest possible losses for high-frequency applications. They can withstand high temperatures, meeting AEC-Q200 Grade 1 (−40°C to +125°C) requirements. High-reliability versions are available for space, military, and other critical applications.

Inductance values from 22 nH to 150 nH
Exceptionally high Q even at low frequencies; Handles up to 3.5 Amps current
Tight tolerance (as low as ±2%) can eliminate circuit tuning
Flat top jacket for mechanical stability and reliable pick and place operations
Solder coated leads ensure reliable soldering
AEC-Q200 Grade 1 (−40°C to +125°C)

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Part number

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Count	Unit price
1	$0.96
250	$0.77
500	$0.67
1000	$0.60
2000	$0.40
5000	$0.26
10000	$0.19

For high volume or non-stock items, request a quote.

Tolerance

J = 5%

G = 2%

Termination

L = Tin-silver

Packaging

C = 7" machine-ready reel

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Designer's Kit:

Kit	Values	Price
C318	11 (12 of each)	$40.00
C318-2	11 (12 of each)	$60.00

Specifications

Electrical specifications at 25°C.

Part number 1	Inductance (nH) 2	Tolerance (%) 3	Q @ 150 MHz 4		SRF min (GHz) 5	DCR max (mΩ) 6	Irms (A) 7
Part number 1	Inductance (nH) 2	Tolerance (%) 3	min	typ	SRF min (GHz) 5	DCR max (mΩ) 6	Irms (A) 7
1812SMS-22N_LC	22	2,5	100	140	3.2	4.2	3.0
1812SMS-27N_LC	27	2,5	100	140	2.7	4.0	3.5
1812SMS-33N_LC	33	2,5	100	140	2.5	4.8	3.0
1812SMS-39N_LC	39	2,5	100	140	2.1	4.4	3.0
1812SMS-47N_LC	47	2,5	100	140	2.1	5.6	3.0
1812SMS-56N_LC	56	2,5	100	140	1.5	6.2	3.0
1812SMS-68N_LC	68	2,5	100	140	1.5	8.2	2.5
1812SMS-82N_LC	82	2,5	100	150	1.3	9.4	2.5
1812SMS-R10_LC	100	2,5	100	180	1.2	12.3	1.7
1812SMS-R12_LC	120	2,5	100	180	1.1	17.3	1.5
1812SMS-R15_LC	150	2,5	100	180	0.75	33.0	1.2

Notes

When ordering, please specify tolerance, termination and packaging codes: e.g. 1812SMS-R12JLC
Inductance tested at 150 MHz on an Agilent/HP 4286A LCR meter or equivalent with a Coilcraft SMD-A test fixture and correlation.
Tolerances in bold are stocked for immediate shipment.
Q tested at 150 MHz on an Agilent/HP 4291A Impedance Analyzer with an Agilent/HP 16193 test fixture or equivalent.
SRF tested on the Agilent/HP 8753D Network Analyzer or equivalent and a Coilcraft CCF1248 test fixture.
DCR tested on the Cambridge Technology Model 510 Micro-ohmmeter or equivalent. For other operating temperatures, use this DCR at Temperature calculator.
Current that causes a 15°C temperature rise from 25°C ambient. This information is for reference only and does not represent absolute maximum ratings.

Tolerance:

G = 2%, J = 5% (Table above shows stock tolerances in bold.)

Termination:

L = RoHS compliant tin-silver (96.5/3.5) over copper.
T = RoHS tin-silver-copper (95.5/4/0.5) over copper. (Special order, added cost)
S = non-RoHS tin-lead (63/37) over copper. (Special order, added cost)

Packaging:

C = 7″ machine-ready reel. EIA-481 embossed plastic tape, 500 parts per full reel. Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
B = Less than full reel. In an effort to simplify our part numbering system, Coilcraft is eliminating the need for multiple packaging codes. When ordering, simply change the last letter of your part number from B to C.
D = 13″ machine-ready reel. EIA-481 embossed plastic tape. Factory order only, not stocked, 2000 parts per full reel.

Environmental

Environmental:

RoHS compliant

Ambient temperature range:

–40°C to +125°C with Irms current

Storage temperature range:

Component: –40°C to +140°C.
Tape and reel packaging: –40°C to +80°C

Maximum part temperature:

+140°C (ambient + temp rise)

Failures in Time (FIT) / Mean Time Between Failures (MTBF):

See FIT/MTBF Calculations

Performance curves

L vs Frequency

Q vs Frequency

Physical characteristics

A max	B max	C max	D	E	F max
0.195	0.250	0.165	0.140 ±0.010	0.170 ±0.015	0.030
4,95	6,35	4,20	3,56 ±0,25	4,32 ±0,38	0,76

Tape and Reel specification

Parts per reel		Reel dimensions (mm)					Tape dimensions (mm)						Orientation
7" (178 mm)	13" (330 mm)	A	B	C	D	E	W	P	Po	P1	H	T
500	2000*	178/330	60/100	13	18,4	12,4	12	8	4	2	4,33	0,3

* Special order

General specification

Weight:

0.10– 0.16 g

Packaging:

500/7″ reel; 2000/13″ reel Plastic tape: 12 mm wide, 0.3 mm thick, 8 mm pocket spacing, 4.33 mm pocket depth

Temperature coefficient of inductance:

+5 to +70 ppm/°C

Soldering/Washing

Moisture Sensitivity Level (MSL):

1 (unlimited floor life at <30°C / 85% relative humidity)

Resistance to soldering heat:

Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles

Refer to Soldering Coilcraft Components before soldering.

Recommended Pick & Place Nozzle:

OD: 0.110 inch; ID: 0.091 inch

PCB Washing:

Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info

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Midi Spring®

Air Core Inductors

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Specifications

Tolerance:

Termination:

Packaging:

Performance curves

L vs Frequency

Q vs Frequency

Physical characteristics

Tape and Reel specification

General specification

Soldering/Washing

Warning