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AxxT/BxxT Series

Mini Spring™ Air Core Inductors

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

Tolerance:

  • = 1%, = 2%, = 5%, = 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.
  • 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, 2500 (AxxT) or 2200 (BxxT) parts per full reel.
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):
One per billion hours / one billion hours, calculated per Telcordia SR-332

Performance curves

L vs Frequency

Q vs Frequency

L vs Frequency

Q vs Frequency

Physical characteristics

minid.gif
 

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

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-(1).gif
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

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