OverviewAll product unitsProduct unitPassive ComponentsProduct groupSignal & CommunicationsProduct familyRF InductorsProduct seriesWE-CAIR Air Coil

WE-CAIR Air Coil

WE-CAIR Air Coil
Size Dimen­sionsL
(mm)
W
(mm)
H
(mm)
Mount
1322 2.21 1.42 1.37 SMT
1340 4.04 1.42 1.37 SMT
3136 3.68 3.05 3.18 SMT
3168 6.68 3.05 3.18 SMT
4248 4.83 3.81 4.2 SMT
5910 10.55 6.35 5.9 SMT

Characteristics

  • Inductance values from 1.65 nH up to 538 nH
  • Very high quality factor >100
  • High self-resonant frequency
  • High currents up to 4.0 A
  • Inductance tolerances 2%, 5 % and 10 %
  • Pick and place process possible
  • Good solderability (tinned connector pins)
  • Operating temperature: -40 °C to +125 °C

Applications

  • Especially for RF applications
  • Ideal for high current applications
  • Broad band filter
  • RF-Decoupling

Modelithics Simulation Models

Incorporate this part into your design with Modelithics’ highly accurate measurement-based simulation models. Request a 90-day FREE trail! Modelithics libraries are available for Keysight Technologies’ Advanced Design System (ADS), NI/AWR Design Environment/Microwave Office™, Keysight Technologies’ Gensys, ASYSS® HFSS™, Sonnet® and Cadence.

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Products

All
1322
1340
3136
3168
4248
5910
Order Code Data­sheet Simu­lation Downloads StatusL
(nH)
Tol. LTest Condition LQmin.
(%)
Test Condition QRDC max.
(mΩ)
IR
(A)
fres
(GHz)
Design Kit Samples
744910016SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 1.65 ±10% 800 MHz 100 800 MHz 4 1.6 1074491
744913025SPEC
9 files Active i| Production is active. Expected lifetime: >10 years. 2.5 ±5% 150 MHz 140 150 MHz 1.1 4 12.574491
744910025SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 2.55 ±5% 800 MHz 100 800 MHz 5 1.6 8.274491
744910038SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 3.85 ±5% 800 MHz 100 800 MHz 6 1.6 7.574491
744913050SPEC
9 files Active i| Production is active. Expected lifetime: >10 years. 5 ±5% 150 MHz 140 150 MHz 1.8 4 6.574491
744913050GSPEC
9 files Active i| Production is active. Expected lifetime: >10 years. 5 ±2% 150 MHz 140 150 MHz 1.8 4 6.5
744910054SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 5.45 ±5% 800 MHz 100 800 MHz 8 1.6 774491
744911056SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 5.6 ±5% 800 MHz 100 800 MHz 9 1.6 6.574491
744911071SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 7.15 ±5% 800 MHz 100 800 MHz 10 1.6 674491
744913080SPEC
9 files Active i| Production is active. Expected lifetime: >10 years. 8 ±5% 150 MHz 140 150 MHz 2.6 4 574491
744913080GSPEC
9 files Active i| Production is active. Expected lifetime: >10 years. 8 ±2% 150 MHz 140 150 MHz 2.6 4 5
744911088SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 8.8 ±5% 800 MHz 100 800 MHz 12 1.6 674491
744911098SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 9.85 ±5% 800 MHz 100 800 MHz 13 1.6 5.2
744913112SPEC
9 files Active i| Production is active. Expected lifetime: >10 years. 12.5 ±5% 150 MHz 137 150 MHz 3.4 4 3.374491
744913112GSPEC
9 files Active i| Production is active. Expected lifetime: >10 years. 12.5 ±2% 150 MHz 137 150 MHz 3.4 4 3.3
744911112SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 12.55 ±5% 800 MHz 100 800 MHz 14 1.6 4.674491
744914117SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 17.5 ±5% 150 MHz 100 150 MHz 4.5 4 2.274491
744914117GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 17.5 ±2% 150 MHz 100 150 MHz 4.5 4 2.2
744913118SPEC
9 files Active i| Production is active. Expected lifetime: >10 years. 18.5 ±5% 150 MHz 132 150 MHz 3.9 4 2.574491
744913118GSPEC
9 files Active i| Production is active. Expected lifetime: >10 years. 18.5 ±2% 150 MHz 132 150 MHz 3.9 4 2.5
744912122SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 22 ±5% 150 MHz 100 150 MHz 4.2 3 3.274491
744914122SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 22 ±5% 150 MHz 102 150 MHz 5.2 4 2.174491
744912122GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 22 ±2% 150 MHz 100 150 MHz 4.2 3 3.2
744914122GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 22 ±2% 150 MHz 102 150 MHz 5.2 4 2.1
744912127SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 27 ±5% 150 MHz 100 150 MHz 4 3.5 2.774491
744912127GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 27 ±2% 150 MHz 100 150 MHz 4 3.5 2.7
744914128SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 28 ±5% 150 MHz 105 150 MHz 6 4 1.874491
744914128GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 28 ±2% 150 MHz 105 150 MHz 6 4 1.8
744912133SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 33 ±5% 150 MHz 100 150 MHz 4.8 3 2.574491
744912133GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 33 ±2% 150 MHz 100 150 MHz 4.8 3 2.5
744914135SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 35.5 ±5% 150 MHz 112 150 MHz 6.8 4 1.574491
744914135GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 35.5 ±2% 150 MHz 112 150 MHz 6.8 4 1.5
744912139SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 39 ±5% 150 MHz 100 150 MHz 4.4 3 2.174491
744912139GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 39 ±2% 150 MHz 100 150 MHz 4.4 3 2.1
744914143SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 43 ±5% 150 MHz 106 150 MHz 7.9 4 1.274491
744914143GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 43 ±2% 150 MHz 106 150 MHz 7.9 4 1.2
744912147SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 47 ±5% 150 MHz 100 150 MHz 5.6 3 2.174491
744912147GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 47 ±2% 150 MHz 100 150 MHz 5.6 3 2.1
744912156SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 56 ±5% 150 MHz 100 150 MHz 6.2 3 1.574491
744912156GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 56 ±2% 150 MHz 100 150 MHz 6.2 3 1.5
744912168SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 68 ±5% 150 MHz 100 150 MHz 8.2 2.5 1.574491
744912168GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 68 ±2% 150 MHz 100 150 MHz 8.2 2.5 1.5
744912182SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 82 ±5% 150 MHz 100 150 MHz 9.4 2.5 1.374491
744912182GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 82 ±2% 150 MHz 100 150 MHz 9.4 2.5 1.3
744918190SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 90 ±5% 50 MHz 100 50 MHz 15 3.5 1.14
744912210SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 100 ±5% 150 MHz 100 150 MHz 12.3 1.7 1.274491
744912210GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 100 ±2% 150 MHz 100 150 MHz 12.3 1.7 1.2
744918211SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 111 ±5% 50 MHz 100 50 MHz 15 3.5 1.02
744912212SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 120 ±5% 150 MHz 100 150 MHz 17.3 1.5 1.174491
744912212GSPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 120 ±2% 150 MHz 100 150 MHz 17.3 1.5 1.1
744918213SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 130 ±5% 50 MHz 100 50 MHz 20 3 0.9
744918217SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 169 ±5% 50 MHz 100 50 MHz 25 3 0.875
744918220SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 206 ±5% 50 MHz 100 50 MHz 30 3 0.8
744918222SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 222 ±5% 50 MHz 100 50 MHz 35 3 0.73
744918224SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 246 ±5% 50 MHz 100 50 MHz 35 3 0.685
744918230SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 307 ±5% 50 MHz 100 50 MHz 35 3 0.66
744918238SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 380 ±5% 50 MHz 100 50 MHz 50 2.5 0.59
744918242SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 422 ±5% 50 MHz 100 50 MHz 60 2.5 0.54
744918249SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 491 ±5% 50 MHz 100 50 MHz 65 2 0.535
744918254SPEC
10 files Active i| Production is active. Expected lifetime: >10 years. 538 ±5% 50 MHz 100 50 MHz 90 2 0.49
Order Code Data­sheet Simu­lation
744910016SPEC
744913025SPEC
744910025SPEC
744910038SPEC
744913050SPEC
744913050GSPEC
744910054SPEC
744911056SPEC
744911071SPEC
744913080SPEC
744913080GSPEC
744911088SPEC
744911098SPEC
744913112SPEC
744913112GSPEC
744911112SPEC
744914117SPEC
744914117GSPEC
744913118SPEC
744913118GSPEC
744912122SPEC
744914122SPEC
744912122GSPEC
744914122GSPEC
744912127SPEC
744912127GSPEC
744914128SPEC
744914128GSPEC
744912133SPEC
744912133GSPEC
744914135SPEC
744914135GSPEC
744912139SPEC
744912139GSPEC
744914143SPEC
744914143GSPEC
744912147SPEC
744912147GSPEC
744912156SPEC
744912156GSPEC
744912168SPEC
744912168GSPEC
744912182SPEC
744912182GSPEC
744918190SPEC
744912210SPEC
744912210GSPEC
744918211SPEC
744912212SPEC
744912212GSPEC
744918213SPEC
744918217SPEC
744918220SPEC
744918222SPEC
744918224SPEC
744918230SPEC
744918238SPEC
744918242SPEC
744918249SPEC
744918254SPEC
Samples
Order Code Data­sheet Simu­lation Downloads StatusL
(nH)
Tol. LTest Condition LQmin.
(%)
Test Condition QRDC max.
(mΩ)
IR
(A)
fres
(GHz)
Design Kit Samples

What is the Quality Factor Q?

The quality factor Q is an essential characteristic parameter and one of the first creterias that every RF engineer should take into account. The Q factor is given either as minimum or as typical value at a defined frequency point. In the case of Würth Elektronik, the Q factor is given as the minimum value in order to guarantee customers a reliable minimum level.

Basically, the Q factor is the ratio between the inductive reactance XL and the losses RS and is an indicator of how ideal an inductor is. For inductors with air or ceramic cores, the resistance RS is mainly due to the resistivity of the conductor in the inductor device. A higher Q factor means less losses in the component.

Self Resonant Frequency

Because the winding structure of any coil of wire will exhibit some capacitance, the inductor will serve as a parallel resonant tank circuit with an associated self-resonance frequency (SRF). As with conventional inductors, SRF indicates up to which frequency the inductor behaves as an inductor.

Exactly at the SRF the inductor with its parasitic capacitance behaves as a resonance circuit with an almost infinite high impedance, only circuit losses limit the high value of the impedance. Beyond the SRF the “inductor” behaves like a capacitor

Increasing the inductance and/or the parasitic capacitance lowers the SRF, and vice versa. This is the reason why the higher the inductance value, the lower the SRF.

In case of choke applications in which inductors are used, the best signal blocking occurs shortly below the SRF, where the impedance is very high and thus the attenuation reaches its maximum. For filter or impedance-matching applications, it is more important to have constant inductance in the relevant frequency range, which means the SRF of the inductor should be well above the operating frequency of the circuit.

Rated Current in high frequency application

The rated current is specified as the maximum DC current (A or mA) that causes a defined temperature rise (i.e. ΔT = 40 K). The temperature rise plus the ambient temperature must not exceed the maximum operating temperature. For high current applications, please select the specific air core inductors: WE-KI HC, WE-ACHC and WE-CAIR.

RF inductors and Antenna Matching

How Antenna Matching works

With the help of the Smith chart, the complex antenna feed point impedance, consisting of resistive and reactive values, can be represented graphically. In a matched antenna, the impedance at the operating frequency is close to the middle of the Smith chart and therefore close to the impedance of 50 Ω. This can be achieved by using RF inductors and RF capacitors. A pi matching network is particularly useful for this purpose, since it can be used flexibly for antenna matching from almost any other impedance. In practice, antenna matching works through iterative steps.

In addition to the WE-MCA Antennas, we offer our customers a development-accompanying antenna service. We support from the antenna selection over the antenna placement up to the antenna matching.

Website: www.we-online.com/antenna-matching

E-Mail: antenna.matching@we-online.com

We are also offering an Antenna Matching Design Kit that contains all the components needed for your antenna matching. This Design Kit with order code 748001, contains chip antennas WE-MCA, multilayer ceramic inductors WE-MK size 0402, high frequency chip capacitors WCAP-CSRF in size 0402 and RF coaxial cables WR-CXARY working up to 18 GHz

Assortments

Articles from this product series can be found in the following assortments: