Site Settings

Warehouses
Language settings
Currency settings
Resources
Video Library
Cx Family Common Mode Chokes
0402CT Low Profile Chip Inductors
XAL7050 High-inductance Shielded Power Inductors
XGL4020 Ultra-low DCR Power Inductors

1515SQ, 2222SQ, 2929SQ Series

Square Air Core Inductors

RoHS compliant halogen free
Coilcraft 1515SQ, 2222SQ, 2929SQ  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 the 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 230 at 400 MHz
  • Handles up to 5.7 Amps current
  • 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, 0908SQ, or 1111SQ.

Need parts for space, military or other critical applications? 
 - See Coilcraft CPS RAS series.
Buy Now:

The part number you have selected is not available through our online store.

Please click the "Request Quote" button for pricing and more information.

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

Designer's Kit:
Kit Values Price
C438 16 (10 of each) $55.00
C438-2 16 (10 of each) $75.00

Specifications

Electrical specifications at 25°C.

1515SQ Series

Part number 1 Inductance (nH) 2 Tolerance (%) 3 Q typ 4 SRF min (GHz) 5 DCR max (mΩ) 6 Irms (A) 7
1515SQ-47N_E_ 47 @ 400 MHz 2,5 230 @ 400 MHz 1.9 6.4 4.9
1515SQ-68N_E_ 68 @ 400 MHz 2,5 230 @ 400 MHz 2.1 8.6 5.5
1515SQ-82N_E_ 82 @ 400 MHz 2,5 230 @ 400 MHz 1.8 9.4 5.6

2222SQ Series

Part number 1 Inductance (nH) 2 Tolerance (%) 3 Q typ 4 SRF min (GHz) 5 DCR max (mΩ) 6 Irms (A) 7
2222SQ-90N_E_ 90 @ 50 MHz 2,5 140 @ 50 MHz 1.2 5.5 5.0
2222SQ-111_E_ 110 @ 50 MHz 2,5 140 @ 50 MHz 1.0 6.5 5.7
2222SQ-131_E_ 130 @ 50 MHz 2,5 140 @ 50 MHz 1.0 7.5 5.4
2222SQ-161_E_ 160 @ 50 MHz 2,5 140 @ 50 MHz 1.0 8.3 5.7
2222SQ-181_E_ 180 @ 50 MHz 2,5 140 @ 50 MHz 1.1 9.5 5.0
2222SQ-221_E_ 220 @ 50 MHz 2,5 140 @ 50 MHz 1.0 11.0 5.0
2222SQ-271_E_ 270 @ 50 MHz 2,5 140 @ 50 MHz 0.80 12.5 4.3
2222SQ-301_E_ 300 @ 50 MHz 2,5 150 @ 50 MHz 0.72 13.8 3.7

2929SQ Series

Part number 1 Inductance (nH) 2 Tolerance (%) 3 Q typ 4 SRF min (GHz) 5 DCR max (mΩ) 6 Irms (A) 7
2929SQ-331_E_ 330 @ 50 MHz 2,5 180 @ 50 MHz 0.66 12.5 4.7
2929SQ-361_E_ 360 @ 50 MHz 2,5 180 @ 50 MHz 0.62 13.5 4.5
2929SQ-391_E_ 390 @ 50 MHz 2,5 180 @ 50 MHz 0.59 14.5 4.4
2929SQ-431_E_ 430 @ 50 MHz 2,5 180 @ 50 MHz 0.55 15.5 4.2
2929SQ-501_E_ 500 @ 50 MHz 2,5 180 @ 50 MHz 0.49 16.5 4.3
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 4287A LCR meter with the following Coilcraft test fixtures: CCF1191C for 1515SQ; CCF1197A for 2222SQ and 2929SQ
  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 the following Coilcraft test fixtures: CCF1143 for 1515SQ; CCF1199 for 2222SQ-90N and 2222SQ-161; CCF1200 for 2222SQ-301 and 2929SQ-501
  6. DCR 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.
  • 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.
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)

Performance curves

L vs Frequency

Q vs Frequency

Physical characteristics

1515sqd.gif
Part number A B C D E F   Weight
(mg)
1515SQ‑47N 0.160 ±0.010 0.140 ±0.007 0.147 ±0.007 0.140 0.175 0.070 inches 110
4,06 ±0,254 3,56 ±0,178 3,73 ±0,178 3,56 4,45 1,78 mm  
1515SQ‑68N 0.210 ±0.010 0.140 ±0.007 0.147 ±0.007 0.190 0.175 0.070 inches 145
5,33 ±0,254 3,56 ±0,178 3,73 ±0,178 4,83 4,45 1,78 mm  
1515SQ‑82N 0.230 ±0.010 0.140 ±0.007 0.147 ±0.007 0.210 0.175 0.070 inches 165
5,84 ±0,254 3,56 ±0,178 3,73 ±0,178 5,33 4,45 1,78 mm  
2222SQ‑90N 0.205 ±0.015 0.215 ±0.010 0.224 ±0.010 0.175 0.255 0.085 inches 280
5,21 ±0,381 5,46 ±0,254 5,69 ±0,254 4,45 6,48 2,16 mm  
2222SQ‑111 0.2.50 ±0.015 0.220 ±0.010 0.224 ±0.010 0.23 0.265 0.085 inches 330
6,35 ±0,381 5,59 ±0,254 5,69 ±0,254 5,84 6,73 2,16 mm  
2222SQ‑131 0.265 ±0.015 0.22 ±0.010 0.224 ±0.010 0.245 0.265 0.085 inches 371
6,73 ±0,381 5,59 ±0,254 5,69 ±0,254 6,22 6,73 2,16 mm  
2222SQ‑161 0.290 ±0.015 0.22 ±0.010 0.224 ±0.010 0.26 0.265 0.085 inches 425
7,37 ±0,381 5,59 ±0,254 5,69 ±0,254 6,60 6,73 2,16 mm  
2222SQ‑181 0.320 ±0.015 0.22 ±0.010 0.224 ±0.010 0.29 0.265 0.085 inches 460
8,13 ±0,381 5,59 ±0,254 5,69 ±0,254 7,37 6,73 2,16 mm  
2222SQ‑221 0.39 ±0.015 0.22 ±0.010 0.224 ±0.010 0.36 0.265 0.085 inches 550
9,91 ±0,381 5,59 ±0,254 5,69 ±0,254 9,14 6,73 2,16 mm  
2222SQ‑271 0.460 ±0.015 0.22 ±0.010 0.224 ±0.010 0.42 0.265 0.085 inches 640
11,68 ±0,381 5,59 ±0,254 5,69 ±0,254 10,67 6,73 2,16 mm  
2222SQ‑301 0.47 0 ±0.015 0.225 ±0.010 0.224 ±0.010 0.44 0.265 0.085 inches 650
11,94 ±0,381 5,72 ±0,254 5,69 ±0,254 11,18 6,73 2,16 mm  
2929SQ‑331 0.405 ±0.015 0.295 ±0.010 0.285 ±0.010 0.375 0.325 0.09 inches 855
10,29 ±0,381 7,49 ±0,254 7,24 ±0,254 9,53 8,26 2,29 mm  
2929SQ‑361 0.445 ±0.015 0.295 ±0.010 0.285 ±0.010 0.415 0.325 0.09 inches 928
11,30 ±0,381 7,49 ±0,254 7,24 ±0,254 10,541 8,26 2,29 mm  
2929SQ‑391 0.485 ±0.015 0.295 ±0.010 0.285 ±0.010 0.455 0.325 0.09 inches 990
12,32 ±0,381 7,49 ±0,254 7,24 ±0,254 11,56 8,26 2,29 mm  
2929SQ‑431 0.52 ±0.015 0.295 ±0.010 0.285 ±0.010 0.49 0.325 0.09 inches 1072
13,21 ±0,381 7,49 ±0,254 7,24 ±0,254 12,45 8,26 2,29 mm  
2929SQ‑501 0.553 ±0.015 0.295 ±0.010 0.285 ±0.010 0.520 0.325 0.09 inches 1160
14,05 ±0,381 7,49 ±0,254 7,24 ±0,254 13,21 8,26 2,29 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
1515SQ‑47N 500 2000* 178/330 60/100 13 18,4 12,4 12 8 4 2 4,06 0,26
1515SQ‑68N 500 2000* 178/330 60/100 13 18,4 12,4 12 8 4 2 4,06 0,26
1515SQ‑82N 500 2000* 178/330 60/100 13 18,4 12,4 12 8 4 2 4,06 0,26
2222SQ‑90N 250 750* 178/330 60/100 13 30,4 24,4 24 12 4 2 5,97 0,32
2222SQ‑111 250 750* 178/330 60/100 13 22,4 16,4 16 12 4 2 6,10 0,40
2222SQ‑131 250 750* 178/330 60/100 13 22,4 16,4 16 12 4 2 6,10 0,40
2222SQ‑161 250 750* 178/330 60/100 13 22,4 16,4 16 12 4 2 5,97 0,33
2222SQ‑181 250 750* 178/330 60/100 13 22,4 16,4 16 12 4 2 6,10 0,40
2222SQ‑221 250 750* 178/330 60/100 13 22,4 16,4 16 12 4 2 6,10 0,40
2222SQ‑271 250 750* 178/330 60/100 13 22,4 16,4 16 12 4 2 6,10 0,40
2222SQ‑301 250 750* 178/330 60/100 13 22,4 16,4 16 12 4 2 5,97 0,33
2929SQ‑331 150 600* 178/330 60/100 13 30,4 24,4 24 12 4 2 6,99 0,40
2929SQ‑361 150 600* 178/330 60/100 13 30,4 24,4 24 12 4 2 7,75 0,40
2929SQ‑391 150 600* 178/330 60/100 13 30,4 24,4 24 12 4 2 7,75 0,40
2929SQ‑431 150 600* 178/330 60/100 13 30,4 24,4 24 12 4 2 7,75 0,40
2929SQ‑501 150 600* 178/330 60/100 13 30,4 24,4 24 12 4 2 >7,49 0,33
* Special order
 

General specification

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:
1515SQ: OD: 0.170 inch; ID: 0.059 inch
2222SQ, 47 – 200 nH: 3.5 mm × 7 mm (rubber). This nozzle is available here.
2222SQ, 270 – 300 nH: 4.0 mm × 12 mm (rubber). This nozzle is available here.
2929SQ: 4.0 mm × 12 mm (rubber). This nozzle is available here.
PCB Washing:
Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

Related product series