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Midi Spring®

Air Core Inductors

RoHS compliant AEC-Q flag
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)
Buy Now:
Count Unit price
1 $0.90
250 $0.67
500 $0.58
1000 $0.52
2000 $0.34
5000 $0.22
10000 $0.13

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

. in stock, ready to ship today.
Request a Sample:

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
min typ
1812SMS-22N 22 2,5 100 140 3.2 4.2 3.0
1812SMS-27N 27 2,5 100 140 2.7 4.0 3.5
1812SMS-33N 33 2,5 100 140 2.5 4.8 3.0
1812SMS-39N 39 2,5 100 140 2.1 4.4 3.0
1812SMS-47N 47 2,5 100 140 2.1 5.6 3.0
1812SMS-56N 56 2,5 100 140 1.5 6.2 3.0
1812SMS-68N 68 2,5 100 140 1.5 8.2 2.5
1812SMS-82N 82 2,5 100 150 1.3 9.4 2.5
1812SMS-R10 100 2,5 100 180 1.2 12.3 1.7
1812SMS-R12 120 2,5 100 180 1.1 17.3 1.5
1812SMS-R15 150 2,5 100 180 0.75 33.0 1.2
Notes
  1. When ordering, please specify tolerance, termination and packaging codes: e.g. 1812SMS-R12JLC
  2. Inductance tested at 150 MHz on an Agilent/HP 4286A LCR meter or equivalent with a Coilcraft SMD-A test fixture and correlation.
  3. Tolerances in bold are stocked for immediate shipment.
  4. Q tested at 150 MHz on an Agilent/HP 4291A Impedance Analyzer with an Agilent/HP 16193 test fixture or equivalent.
  5. SRF tested on the Agilent/HP 8753D Network Analyzer or equivalent and a Coilcraft CCF1248 test fixture.
  6. DCR tested on the Cambridge Technology Model 510 Micro-ohmmeter or equivalent. For other operating temperatures, use this DCR at Temperature calculator.
  7. 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:

  • = 2%, = 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.
  • 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, 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):
One per billion hours / one billion hours, calculated per Telcordia SR-332

Performance curves

L vs Frequency

Q vs Frequency

Physical characteristics

midid.gif
 

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

tapereel_pl.gif
 

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 part_or_j.gif
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