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AxxT/BxxT Series

Mini Spring™ Air Core Inductors

Our AxxT/BxxT Series Mini Spring™ 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 their high Q and the lowest possible losses for high-frequency applications. High-reliability versions are available for space, military, and other critical applications.

Inductance values from 2.5 nH to 43 nH (tolerances as low as 2%)
Tight tolerance can eliminate circuit tuning
Flat top for mechanical stability and reliable pick and place operations
Exceptionally high Q over a wide frequency range
Highest possible self resonance (greater than 12.5 GHz)
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	$1.06
350	$0.87
700	$0.70
1400	$0.60
2100	$0.40
4000	$0.27

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

Tolerance

K = 10%

Termination

L = Tin-silver

Packaging

C = 7" machine-ready reel

. in stock, ready to ship today.

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Designer's Kit:

Kit	Values	Price
C302	10 (12 of each)	$40.00
C302-2	10 (12 of each)	$60.00

Specifications

Electrical specifications at 25°C.

AxxT Series

Part number 1	Turns	Inductance (nH) 2	Tolerance (%) 3	Q min @ 150 MHz 4	SRF min (GHz) 5	DCR max (mΩ) 6	Irms (A) 7
Part number 1	Turns	Inductance (nH) 2	Tolerance (%) 3	Q min @ 150 MHz 4	SRF min (GHz) 5	DCR max (mΩ) 6	Irms (A) 7
A01TKL_	1	2.5	10	145	12.5	1.1	4.0
A02T_L_	2	5.0	1,2,5	140	6.5	1.8	4.0
A03T_L_	3	8.0	1,2,5	140	5.0	2.6	4.0
A04T_L_	4	12.5	1,2,5	137	3.3	3.4	4.0
A05T_L_	5	18.5	1,2,5	132	2.5	3.9	4.0

BxxT Series

Part number 1	Turns	Inductance (nH) 2	Tolerance (%) 3	Q min @ 150 MHz 4	SRF min (GHz) 5	DCR max (mΩ) 6	Irms (A) 7
Part number 1	Turns	Inductance (nH) 2	Tolerance (%) 3	Q min @ 150 MHz 4	SRF min (GHz) 5	DCR max (mΩ) 6	Irms (A) 7
B06T_L_	6	17.5	1,2,5	100	2.2	4.5	4.0
B07T_L_	7	22.0	1,2,5	102	2.1	5.2	4.0
B08T_L_	8	28.0	1,2,5	105	1.8	6.0	4.0
B09T_L_	9	35.5	1,2,5	112	1.5	6.8	4.0
B10T_L_	10	43.0	1,2,5	106	1.2	7.9	4.0

Notes

When ordering, please specify tolerance, termination and packaging codes: e.g. B10TJLC
Inductance measured at 150 MHz with an Agilent/HP 4286 or equivalent, a Coilcraft SMD-A and correlation pieces.
Tolerances in bold are stocked for immediate shipment.
Q measured at 150 MHz using an Agilent/HP 4291A with an Agilent/HP 16193A test fixture or equivalent.
SRF tested on an Agilent/HP 8720D or equivalent and a Coilcraft SMD-D fixture.
DCR tested on the Cambridge Technology Model 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.

Tolerance:

F = 1%, G = 2%, J = 5%, K = 10% (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, 700 (AxxT) or 500 (BxxT) 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. Factory order only, not stocked, 2500 (AxxT) or 2200 (BxxT) parts per full reel.
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

Ambient temperature range:

–40°C to +125°C with Irms current, +125°C to +140°C with derated 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 + temperature rise)

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

See FIT/MTBF Calculations

Performance curves

L vs Frequency

AxxT

Q vs Frequency

AxxT

L vs Frequency

BxxT

Q vs Frequency

BxxT

Physical characteristics

Part number	Weight (mg)
A01T	31
A02T	42
A03T	52
A04T	65
A05T	78
B06T	100
B07T	110
B08T	118
B09T	133
B10T	147

Tape and Reel specification

Parts per reel			Reel dimensions (mm)					Tape dimensions (mm)
	7" (178 mm)	13" (330 mm)	A	B	C	D	E	W	P	Po	P1	H	T
Size A	700	2500*	178/330	60/100	13	18,4	12,4	12	8	4	2	3,3	0,32
Size B	500	2200*	178/330	60/100	13	12,4	16,4	16	8	4	2	3,4	0,28

* Special order

General specification

Packaging:

A0xT: 700/7″ reel; 2500/13″ reel Plastic tape: 12 mm wide, 0.32 mm thick, 8 mm pocket spacing, 3.3 mm pocket depth
BxxT: 500/7″ reel; 2200/13″ reel Plastic tape: 16 mm wide, 0.28 mm thick, 8 mm pocket spacing, 3.4 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

AxxT/BxxT Series

Mini Spring™ Air Core Inductors