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Document 720 -1
Square
Air
Core
Inductors
1515SQ
2222SQ
2929SQ
• Excellent Q factors – up to 230 at 400 MHz!
• Current handling as high as 5.7 Amps
• Inductance values from 47 to 500 nH
• Flat top and bottom for reliable pick and place and mechanical
stability
Designer’s Kit C438 contains 10 each of all 5% parts
Terminations  RoHS compliant tin-silver over copper
Ambient temperature  –40°C to +125°C with Irms current
Maximum part temperature  +145°C (ambient + temp rise).
Storage temperature  Component: –40°C to +145°C.
Tape and reel packaging: –40°C to +80°C
Resistance to soldering heat  Max three 40 second reflows at
+260°C, parts cooled to room temperature between cycles
Temperature Coefficient of Inductance (TCL)  +5 to +70 ppm/°C
Moisture Sensitivity Level (MSL)  1 (unlimited floor life at <30°C /
85% relative humidity)
Mean Time Between Failures (MTBF)  1 billion hours
PCB washing  Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See Doc787_PCB_Washing.pdf.
Test
Inductance2
Percent
Q4 frequency SRF min5
DCR max
Irms6
Part number1 (nH) tolerance3 typ
(MHz) (GHz) (mOhm) (A)
1515SQ-47N_E_ 47
1515SQ-68N_E_ 68
1515SQ-82N_E_ 82
2222SQ-90N_E_ 90
2222SQ-111_E_ 110
2222SQ-131_E_ 130
2222SQ-161_E_ 160
2222SQ-181_E_ 180
2222SQ-221_E_ 220
2222SQ-271_E_ 270
2222SQ-301_E_ 300
2929SQ-331_E_ 330
2929SQ-361_E_ 360
2929SQ-391_E_ 390
2929SQ-431_E_ 430
2929SQ-501_E_ 500
5,2 230
5,2 230
5,2 230
5,2 140
5,2 140
5,2 140
5,2 140
5,2 140
5,2 140
5,2 140
5,2 150
5,2 180
5,2 180
5,2 180
5,2 180
5,2 180
400 1.87 6.35
400 2.13 8.60
400 1.79 9.40
50 1.15 5.50
50 1.00 6.50
50 1.00 7.50
50 1.00 8.25
50 1.10 9.50
50 1.00 11.0
50 0.800 12.5
50 0.720 13.8
50 0.660 12.5
50 0.620 13.5
50 0.590 14.5
50 0.550 15.5
50 0.500 16.5
4.9
5.5
5.6
5.0
5.7
5.4
5.7
5.0
5.0
4.3
3.7
4.7
4.5
4.4
4.2
4.3
1. When ordering, specify tolerance, termination and packaging codes:
1515SQ-82NJEC
Tolerance: G = 2%  J = 5%
(Table shows stock tolerances in bold.)
Termination: E = RoHS compliant tin-silver (96.5/3.5) over copper.
Special order, added cost:
T = RoHS tin-silver-copper (95.5/4/0.5) over copper
or S = non-RoHS tin-lead (63/37) over copper.
Packaging: C = 7machine-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 = 13machine-ready reel. EIA-481 embossed plastic
tape. Factory order only, not stocked.
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. 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.
7. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Document 720-1  Revised 10/12/15

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Document 720-2
Square Air Core Inductors – 1515SQ, 2222SQ, 2929SQ
max
Strip
length
C
min
B
A
D
E
F
Recommended
Land Pattern
Packaging:
1515SQ-47N  500/7reel; 2000/13reel  Plastic tape: 12 mm wide,
0.26 mm thick, 8 mm pocket spacing, 4.06 mm pocket depth
1515SQ-68N  500/7reel; 2000/13reel  Plastic tape: 12 mm wide,
0.26 mm thick, 8 mm pocket spacing, 4.06 mm pocket depth
1515SQ-82N  500/7reel; 2000/13reel  Plastic tape: 12 mm wide,
0.26 mm thick, 8 mm pocket spacing, 4.06 mm pocket depth
2222SQ-90N  250/7reel; 750/13reel  Plastic tape: 16 mm wide,
0.32 mm thick, 12 mm pocket spacing, 5.97 mm pocket depth
2222SQ-111  250/7reel; 750/13reel  Plastic tape: 16 mm wide,
0.40 mm thick, 12 mm pocket spacing, 6.10 mm pocket depth
2222SQ-131  250/7reel; 750/13reel  Plastic tape: 16 mm wide,
0.40 mm thick, 12 mm pocket spacing, 6.10 mm pocket depth
2222SQ-161  250/7reel; 750/13reel  Plastic tape: 16 mm wide,
0.33 mm thick, 12 mm pocket spacing, 5.97 mm pocket depth
2222SQ-181  250/7reel; 750/13reel  Plastic tape: 16 mm wide,
0.40 mm thick, 12 mm pocket spacing, 6.10 mm pocket depth
2222SQ-221  250/7reel; 750/13reel  Plastic tape: 24 mm wide,
0.40 mm thick, 12 mm pocket spacing, 6.10 mm pocket depth
2222SQ-271  250/7reel; 750/13reel  Plastic tape: 24 mm wide,
0.40 mm thick, 12 mm pocket spacing, 6.10 mm pocket depth
2222SQ-301  250/7reel; 750/13reel  Plastic tape: 24 mm wide,
0.33 mm thick, 12 mm pocket spacing, 5.97 mm pocket depth
2929SQ-331  150/7reel; 600/13reel  Plastic tape: 24 mm wide,
0.40 mm thick, 12 mm pocket spacing, 6.99 mm pocket depth
2929SQ-361  150/7reel; 600/13reel  Plastic tape: 24 mm wide,
0.40 mm thick, 12 mm pocket spacing, 7.75 mm pocket depth
2929SQ-391  150/7reel; 600/13reel  Plastic tape: 24 mm wide,
0.45 mm thick, 12 mm pocket spacing, 7.75 mm pocket depth
2929SQ-431  150/7reel; 600/13reel  Plastic tape: 24 mm wide,
0.45 mm thick, 12 mm pocket spacing, 7.75 mm pocket depth
2929SQ-501  150/7reel; 600/13reel  Plastic tape: 24 mm wide,
0.33 mm thick, 12 mm pocket spacing, 7.49 mm pocket depth
Part Weight
number
A
B C D E F (mg)
1515SQ-47N 0.160±0.010 0.140 ±0.007 0.147 ±0.007 0.140 0.175 0.070 110
4,06 ±0,254 3,56 ±0,178 3,73 ±0,178 3,56 4,45 1,78
1515SQ-68N 0.210 ±0.010 0.140 ±0.007 0.147 ±0.007 0.190 0.175 0.070 145
5,33 ±0,254 3,56 ±0,178 3,73 ±0,178 4,83 4,45 1,78
1515SQ-82N 0.230 ±0.010 0.140 ±0.007 0.147 ±0.007 0.210 0.175 0.070 165
5,84 ±0,254 3,56 ±0,178 3,73 ±0,178 5,33 4,45 1,78
2222SQ-90N
2222SQ-111
2222SQ-131
2222SQ-161
2222SQ-181
2222SQ-221
2222SQ-271
2222SQ-301
0.205 ±0.015
5,21 ±0,381
0.250 ±0.015
6,35 ±0,381
0.265 ±0.015
6,73 ±0,381
0.290 ±0.015
7,37 ±0,381
0.320 ±0.015
8,13 ±0,381
0.390 ±0.015
9,91 ±0,381
0.460 ±0.015
11,68 ±0,381
0.470 ±0.015
11,94 ±0,381
0.215 ±0.010
5,46 ±0,254
0.220±0.010
5,59 ±0,254
0.220 ±0.010
5,59 ±0,254
0.220 ±0.010
5,59 ±0,254
0.220 ±0.010
5,59 ±0,254
0.220 ±0.010
5,59 ±0,254
0.220 ±0.010
5,59 ±0,254
0.225 ±0.010
5,72 ±0,254
0.224 ±0.010
5,69 ±0,254
0.224 ±0.010
5,69 ±0,254
0.224 ±0.010
5,69 ±0,254
0.224 ±0.010
5,69 ±0,254
0.224 ±0.010
5,69 ±0,254
0.224 ±0.010
5,69 ±0,254
0.224 ±0.010
5,69 ±0,254
0.224 ±0.010
5,69 ±0,254
0.175
4,45
0.230
5,84
0.245
6,22
0.260
6,60
0.290
7,37
0.360
9,14
0.420
10,67
0.440
11,18
0.255
6,48
0.265
6,73
0.265
6,73
0.265
6,73
0.265
6,73
0.265
6,73
0.265
6,73
0.265
6,73
0.085
2,16
0.085
2,16
0.085
2,16
0.085
2,16
0.085
2,16
0.085
2,16
0.085
2,16
0.085
2,16
280
330
371
425
460
550
640
650
2929SQ-331
2929SQ-361
2929SQ-391
2929SQ-431
2929SQ-501
0.405 ±0.015
10,29 ±0,381
0.445 ±0.015
11,30 ±0,381
0.485 ±0.015
12,32 ±0,381
0.520 ±0.015
13,21 ±0,381
0.550 ±0.015
14,00 ±0,381
0.295 ±0.010
7,49 ±0,254
0.295 ±0.010
7,49 ±0,254
0.295 ±0.010
7,49 ±0,254
0.295 ±0.010
7,49 ±0,254
0.290 ±0.010
7,49 ±0,254
All dimensions are in inmcmhes.
0.285 ±0.010
7,24 ±0,254
0.285 ±0.010
7,24 ±0,254
0.285 ±0.010
7,24 ±0,254
0.285 ±0.010
7,24 ±0,254
0.285 ±0.010
7,24 ±0,254
0.375
9,53
0.415
10,541
0.455
11,56
0.490
12,45
0.520
13,21
0.325
8,26
0.325
8,26
0.325
8,26
0.325
8,26
0.325
8,26
0.09
2,29
0.09
2,29
0.09
2,29
0.09
2,29
0.09
2,29
855
928
990
1072
1160
Recommended pick and place nozzles
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.
Document 720-2  Revised 10/12/15

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Document 720-3
Square Air Core Inductors – 1515SQ, 2222SQ, 2929SQ
Typical Q vs Frequency
350
Typical L vs Frequency
1000
300
47, 68, 82 nH
500 nH
300 nH
250
90, 160 nH
160 nH
200
300 nH
100
90 nH
150 500 nH
82 nH
68 nH
100 47 nH
50
0 10
1
10
100
1000
1
10 100
Frequency (MHz)
Frequency (MHz)
1000
Document 720-2  Revised 10/12/15