OverviewAll product unitsProduct unitPassive ComponentsProduct groupSignal & CommunicationsProduct familyRF InductorsProduct seriesWE-KI HC SMT High Current Wire Wound Ceramic Inductor

WE-KI HC SMT High Current Wire Wound Ceramic Inductor

Size Dimen­sions 3DL
(mm)
W
(mm)
H
(mm)
Mount
0402 1.1 0.6 0.6 SMT
0603 1.7 1.1 0.9 SMT

Characteristics

  • Inductance values ​​from 1 nH up to 390 nH
  • High quality factor Q
  • High self-resonant frequency
  • High currents up to 2.3 A
  • 2% Inductance tolerance
  • Operating temperature: -40 ° C to +125 ° C

Applications

  • Especially for RF application
  • Ideal for high current applications
  • Wideband filter
  • Decoupling

Modelithics Simulation Models

Incorporate this part into your design with Modelithics’ highly accurate measurement-based simulation models. Request a 90-day FREE trial! 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
0402
0603
Order Code Data­sheet Simu­lation DownloadsL
(nH)
Tol. LTest Condition LQmin.Test Condition QRDC max.
(Ω)
IR
(mA)
fres
(MHz)
Design Kit Samples
744916010SPEC
9 files 1 ±0.2nH 250 MHz 20 250 MHz 0.03 2300 1600074476
744917018SPEC
9 files 1.8 ±0.2nH 250 MHz 18 250 MHz 0.033 2100 1600074476
744916020SPEC
9 files 2 ±0.2nH 250 MHz 24 250 MHz 0.038 2100 15200
744916022SPEC
9 files 2.2 ±0.2nH 250 MHz 25 250 MHz 0.038 2100 1510074476
744917022SPEC
9 files 2.2 ±0.2nH 250 MHz 10 250 MHz 0.23 900 15000
744916027SPEC
9 files 2.7 ±0.2nH 250 MHz 24 250 MHz 0.56 1500 13000
744916033SPEC
9 files 3.3 ±0.2nH 250 MHz 28 250 MHz 0.045 1700 1280074476
744917033SPEC
9 files 3.3 ±0.2nH 250 MHz 26 250 MHz 0.024 1900 9600
744916036SPEC
9 files 3.6 ±0.2nH 250 MHz 28 250 MHz 0.045 1700 11700
744917036SPEC
9 files 3.6 ±0.2nH 250 MHz 32 250 MHz 0.031 1900 9700
744916039SPEC
9 files 3.9 ±0.2nH 250 MHz 28 250 MHz 0.045 1700 9500
744917039SPEC
9 files 3.9 ±0.2nH 250 MHz 28 250 MHz 0.039 1600 750074476
744916043SPEC
9 files 4.3 ±0.2nH 250 MHz 27 250 MHz 0.04 1600 715074476
744917043SPEC
9 files 4.3 ±0.2nH 250 MHz 24 250 MHz 0.08 1300 7500
744916047SPEC
9 files 4.7 ±0.2nH 250 MHz 23 250 MHz 0.06 1500 6850
744916051SPEC
9 files 5.1 ±0.2nH 250 MHz 20 250 MHz 0.1 1200 680074476
744917051SPEC
9 files 5.1 ±0.2nH 250 MHz 32 250 MHz 0.036 1700 8900
744916056SPEC
9 files 5.6 ±0.2nH 250 MHz 29 250 MHz 0.048 1600 6500
744917056SPEC
9 files 5.6 ±0.2nH 250 MHz 38 250 MHz 0.036 1700 660074476
744917060SPEC
9 files 6 ±0.2nH 250 MHz 39 250 MHz 0.036 1700 6000
744916062SPEC
9 files 6.2 ±0.2nH 250 MHz 29 250 MHz 0.05 1600 580074476
744916068SPEC
9 files 6.8 ±2% 250 MHz 28 250 MHz 0.055 1500 580074476
744917068SPEC
9 files 6.8 ±2% 250 MHz 34 250 MHz 0.042 1400 580074476
744917072SPEC
9 files 7.2 ±2% 250 MHz 38 250 MHz 0.07 1400 5400
744917075SPEC
9 files 7.5 ±2% 250 MHz 33 250 MHz 0.08 1300 5300
744916082SPEC
9 files 8.2 ±2% 250 MHz 28 250 MHz 0.058 1500 5400
744917082SPEC
9 files 8.2 ±2% 250 MHz 37 250 MHz 0.054 1400 5900
744916087SPEC
9 files 8.7 ±2% 250 MHz 29 250 MHz 0.065 1500 500074476
744917087SPEC
9 files 8.7 ±2% 250 MHz 46 250 MHz 0.054 1400 5500
744916090SPEC
9 files 9 ±2% 250 MHz 27 250 MHz 0.073 1400 5000
744917091SPEC
9 files 9.1 ±2% 250 MHz 32 250 MHz 0.058 1400 510074476
744916095SPEC
9 files 9.5 ±2% 250 MHz 28 250 MHz 0.075 1400 4700
744917095SPEC
9 files 9.5 ±2% 250 MHz 39 250 MHz 0.053 1400 4900
744916110SPEC
9 files 10 ±2% 250 MHz 26 250 MHz 0.085 1300 470074476
744917110SPEC
9 files 10 ±2% 250 MHz 39 250 MHz 0.048 1400 4300
744916111SPEC
9 files 11 ±2% 250 MHz 29 250 MHz 0.065 1400 4700
744917111SPEC
9 files 11 ±2% 250 MHz 33 250 MHz 0.058 1400 4100
744916112SPEC
9 files 12 ±2% 250 MHz 28 250 MHz 0.07 1200 440074476
744917112SPEC
9 files 12 ±2% 250 MHz 30 250 MHz 0.115 1100 4100
744916113SPEC
9 files 13 ±2% 250 MHz 27 250 MHz 0.14 870 4200
744916115SPEC
9 files 15 ±2% 250 MHz 28 250 MHz 0.13 1100 390074476
744917115SPEC
9 files 15 ±2% 250 MHz 38 250 MHz 0.078 1200 360074476
744916116SPEC
9 files 16 ±2% 250 MHz 27 250 MHz 0.13 850 3700
744917116SPEC
9 files 16 ±2% 250 MHz 36 250 MHz 0.085 1100 3500
744916118SPEC
9 files 18 ±2% 250 MHz 26 250 MHz 0.12 900 355074476
744917118SPEC
9 files 18 ±2% 250 MHz 33 250 MHz 0.066 1200 3300
744916119SPEC
9 files 19 ±2% 250 MHz 26 250 MHz 0.175 850 3500
744916121SPEC
9 files 21 ±2% 250 MHz 25 250 MHz 0.46 450 1700
744916122SPEC
9 files 22 ±2% 250 MHz 28 250 MHz 0.25 800 330074476
744917122SPEC
9 files 22 ±2% 250 MHz 35 250 MHz 0.14 850 315074476
744916123SPEC
9 files 23 ±2% 250 MHz 28 250 MHz 0.16 800 3300
744917123SPEC
9 files 23 ±2% 250 MHz 32 250 MHz 0.19 850 3000
744916124SPEC
9 files 24 ±2% 250 MHz 27 250 MHz 0.29 700 3150
744917124SPEC
9 files 24 ±2% 250 MHz 34 250 MHz 0.074 1100 2950
744916125SPEC
9 files 25 ±2% 250 MHz 26 250 MHz 0.3 700 315074476
744916126SPEC
9 files 26 ±2% 250 MHz 27 250 MHz 0.275 700 3150
744916127SPEC
9 files 27 ±2% 250 MHz 27 250 MHz 0.33 450 3200
744917127SPEC
9 files 27 ±2% 250 MHz 35 250 MHz 0.2 780 280074476
744916130SPEC
9 files 30 ±2% 250 MHz 25 250 MHz 0.4 450 2900
744917130SPEC
9 files 30 ±2% 250 MHz 39 250 MHz 0.16 920 2800
744916133SPEC
9 files 33 ±2% 250 MHz 28 250 MHz 0.33 490 280074476
744917133SPEC
9 files 33 ±2% 250 MHz 36 250 MHz 0.22 680 2700
744916136SPEC
9 files 36 ±2% 250 MHz 26 250 MHz 0.36 480 2800
744917136SPEC
9 files 36 ±2% 250 MHz 35 250 MHz 0.225 720 250074476
744916137SPEC
9 files 37 ±2% 250 MHz 26 250 MHz 0.48 470 2700
744916139SPEC
9 files 39 ±2% 250 MHz 28 250 MHz 0.43 450 260074476
744917139SPEC
9 files 39 ±2% 250 MHz 38 250 MHz 0.25 680 2450
744916140SPEC
9 files 40 ±2% 250 MHz 28 250 MHz 0.52 450 2600
744916143SPEC
9 files 43 ±2% 250 MHz 26 250 MHz 0.52 450 2500
744917143SPEC
9 files 43 ±2% 250 MHz 36 250 MHz 0.225 810 2450
744916147SPEC
9 files 47 ±2% 250 MHz 28 250 MHz 0.58 420 240074476
744917147SPEC
9 files 47 ±2% 200 MHz 38 250 MHz 0.24 680 2300
744916151SPEC
9 files 51 ±2% 250 MHz 26 250 MHz 0.7 360 230074476
744917151SPEC
9 files 51 ±2% 200 MHz 39 250 MHz 0.28 660 230074476
744917156SPEC
9 files 56 ±2% 200 MHz 40 250 MHz 0.3 610 2200
744917168SPEC
9 files 68 ±2% 200 MHz 37 250 MHz 0.33 600 2000
744917172SPEC
9 files 72 ±2% 150 MHz 37 250 MHz 0.42 550 1900
744917175SPEC
9 files 75 ±2% 150 MHz 37 250 MHz 0.52 500 190074476
744917182SPEC
9 files 82 ±2% 150 MHz 35 250 MHz 0.46 510 1800
744917191SPEC
9 files 91 ±2% 150 MHz 36 250 MHz 0.58 440 1650
744917210SPEC
9 files 100 ±2% 150 MHz 35 250 MHz 0.54 470 170074476
744917211SPEC
9 files 110 ±2% 150 MHz 38 250 MHz 0.58 440 1600
744917212SPEC
9 files 120 ±2% 150 MHz 32 250 MHz 0.72 420 1550
744917215SPEC
9 files 150 ±2% 150 MHz 38 250 MHz 0.82 390 135074476
744917218SPEC
9 files 180 ±2% 100 MHz 25 250 MHz 1.5 310 1300
744917220SPEC
9 files 200 ±2% 100 MHz 38 250 MHz 2 280 125074476
744917221SPEC
9 files 210 ±2% 100 MHz 24 250 MHz 2 280 1200
744917222SPEC
9 files 220 ±2% 100 MHz 25 250 MHz 2 280 110074476
744917225SPEC
9 files 250 ±2% 100 MHz 25 250 MHz 3 240 1050
744917227SPEC
9 files 270 ±2% 100 MHz 25 250 MHz 2.25 260 105074476
744917230SPEC
9 files 300 ±2% 100 MHz 25 250 MHz 2.8 220 990
744917233SPEC
9 files 330 ±2% 100 MHz 25 250 MHz 3.6 180 93074476
744917236SPEC
9 files 360 ±2% 100 MHz 25 250 MHz 4.6 170 930
744917239SPEC
9 files 390 ±2% 100 MHz 25 250 MHz 4.7 170 88074476
Order Code Data­sheet Simu­lation
744916010SPEC
744917018SPEC
744916020SPEC
744916022SPEC
744917022SPEC
744916027SPEC
744916033SPEC
744917033SPEC
744916036SPEC
744917036SPEC
744916039SPEC
744917039SPEC
744916043SPEC
744917043SPEC
744916047SPEC
744916051SPEC
744917051SPEC
744916056SPEC
744917056SPEC
744917060SPEC
744916062SPEC
744916068SPEC
744917068SPEC
744917072SPEC
744917075SPEC
744916082SPEC
744917082SPEC
744916087SPEC
744917087SPEC
744916090SPEC
744917091SPEC
744916095SPEC
744917095SPEC
744916110SPEC
744917110SPEC
744916111SPEC
744917111SPEC
744916112SPEC
744917112SPEC
744916113SPEC
744916115SPEC
744917115SPEC
744916116SPEC
744917116SPEC
744916118SPEC
744917118SPEC
744916119SPEC
744916121SPEC
744916122SPEC
744917122SPEC
744916123SPEC
744917123SPEC
744916124SPEC
744917124SPEC
744916125SPEC
744916126SPEC
744916127SPEC
744917127SPEC
744916130SPEC
744917130SPEC
744916133SPEC
744917133SPEC
744916136SPEC
744917136SPEC
744916137SPEC
744916139SPEC
744917139SPEC
744916140SPEC
744916143SPEC
744917143SPEC
744916147SPEC
744917147SPEC
744916151SPEC
744917151SPEC
744917156SPEC
744917168SPEC
744917172SPEC
744917175SPEC
744917182SPEC
744917191SPEC
744917210SPEC
744917211SPEC
744917212SPEC
744917215SPEC
744917218SPEC
744917220SPEC
744917221SPEC
744917222SPEC
744917225SPEC
744917227SPEC
744917230SPEC
744917233SPEC
744917236SPEC
744917239SPEC
Samples
Order Code Data­sheet Simu­lation DownloadsL
(nH)
Tol. LTest Condition LQmin.Test Condition QRDC max.
(Ω)
IR
(mA)
fres
(MHz)
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: