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1111SQ Series

Square Air Core Inductors

RoHS compliant halogen free
Coilcraft 1111SQ Series square air core inductors have extremely 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. High-reliability versions are available for space, military, and other critical applications.
  • Exceptionally high Q – up to 200 at 400 MHz
  • Inductance values from 27 to 47 nH
  • Flat top and bottom for reliable pick and place and mechanical stability
  • Solder coated leads ensure excellent solderability
  • For lower inductance values, consider the 0806SQ, 0807SQ and 0908SQ
  • For higher inductance values, consider the 1515SQ, 2222SQ and 2929SQ
Buy Now:
Count Unit price
1 $1.21
300 $0.98
600 $0.80
1200 $0.64
2400 $0.45
5000 $0.34
10000 $0.32

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
C457 7 (10 of each) $45.00

Specifications

Electrical specifications at 25°C.

Part number 1 Inductance (nH) 2 Tolerance (%) 3 Q typ
@ 400 MHz 4
SRF min (GHz) 5 DCR (mΩ) 6 Irms (A) 7
typ max
1111SQ-27N_E_ 27 2,5 200 2.6 7.0 8.1 5.5
1111SQ-30N_E_ 30 2,5 200 2.4 7.2 8.3 5.5
1111SQ-33N_E_ 33 2,5 200 2.3 8.3 9.5 4.8
1111SQ-36N_E_ 36 2,5 200 2.3 8.5 9.8 4.8
1111SQ-39N_E_ 39 2,5 200 2.2 8.7 10.0 4.8
1111SQ-43N_E_ 43 2,5 200 2.2 9.4 10.8 4.4
1111SQ-47N_E_ 47 2,5 200 2.2 9.8 11.3 4.4
Notes
  1. When ordering, please specify tolerancetermination and packaging codes: e.g. 2929SQ-501JEC
  2. Inductance measured at specified test frequency, 0.1 Vrms, 0 A using an Agilent/HP 4286A LCR meter with a Coilcraft CCF1191C test fixture.
  3. Tolerances in bold are stocked for immediate shipment
  4. Q measured at specified test frequency, using an Agilent/HP 4291A impedance analyzer.
  5. SRF measured using an Agilent/HP 8753 network analyzer and a Coilcraft CCF1248 test fixture.
  6. DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
  7. Irms: Current that causes a 20°C temperature rise from 25°C ambient. This information is for reference only and does not represent absolute maximum ratings.

Tolerance:

  • = 2%, = 5% (Table shows stock tolerances in bold.)

Termination:

  • E = 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 (600 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
  • D = 13″ machine-ready reel. EIA-481 embossed plastic tape (2500 parts per full reel). Factory order only, not stocked.
  • 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.
Environmental
Environmental:
RoHS compliant , halogen free
Ambient temperature range:
−40°C to +125°C with Irms current
Storage temperature range:
Component: −40°C to +145°C
Tape and reel packaging: −40°C to +80°C
Maximum part temperature:
+145°C (Ambient + temperature rise)
Failures in Time (FIT) / Mean Time Between Failures (MTBF):

Performance curves

L vs Frequency

Q vs Frequency

Physical characteristics

1111sqd.gif
 
Part number A B C D E F  
1111SQ-27N
1111SQ-30N
0.105±0.010 0.105 ±0.015 0.110 ±0.005 0.090 0.120 0.0>40 inches
2,67 ±0,254 2,67 ±0,381 2,79 ±0,127 2.29 3,05 1,02 mm
1111SQ-33N
1111SQ-36N
1111SQ-39N
0.115±0.010 0.105 ±0.015 0.110 ±0.005 0.100 0.120 0.0>40 inches
2,92 ±0,254 2,67 ±0,381 2,79 ±0,127 2.54 3,05 1,02 mm
1111SQ-43N
1111SQ-47N
0.130 ±0.010 0.105 ±0.015 0.110 ±0.005 0.110 0.120 0.040 inches
3,30 ±0,254 2,67 ±0,381 2,79 ±0,127 2.79 3,05 1,02 mm

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_ah.gif
600 2500* 178/330 60/100 13 18,4 12,4 12 8 4 2 3,05 0,35
*Special order
 

General specification

Weight:
34 - 50 mg
Packaging:
600/7″ reel; 2500/13″ reel; Plastic tape: 12 mm wide, 0.35 mm thick, 8 mm pocket spacing, 3.05 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:
Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
Refer to Soldering Coilcraft Components before soldering.
Recommended Pick & Place Nozzle:
OD: 0.054 inch; ID: 0.031 inch
PCB Washing:
Tested with pure water or alcohol only. Other solvents.

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