Through Hole Inductors, Choke, Coils

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Token Electronics brand passive component specializes in standard and custom solutions offering the latest in state-of-the-art low profile high power density inductor components. Token provides cost-effective, comprehensive solutions that meet the evolving needs of technology-driven markets. In working closely with the industry leaders in chipset and core development, we remain at the forefront of innovation and new technology to deliver the optimal mix of packaging, high efficiency and unbeatable reliability. Our designs utilize high frequency, low core loss materials, new and custom core shapes in combination with innovative construction and packaging to provide designers with the highest performance parts available on the market.

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Power Wirewound Fixed Inductors

ThumbnailInductor through hole type and description DCR Inductance

  • 1 (TCUU) EMI Line Filters 0.15Ω ~ 9.12Ω 0.47μH ~51000μH The line filter arrangement consists of two sections bobbin between the mains supply and the equipment. Note that the common-mode filter is wound on a single core and the differential mode filter consists of two indiviual wound cores. The common-mode noise is in relation to ground and is common to both lines. Differential mode noise is the noise between the two lines. Both types of noise are usually present to varying degrees. Token line filters TCUU series common mode choke coils are used in a wide range of prevention of radio frequency interference (RFI) and electromagnetic interference (EMI) from power supply lines and for prevention of multifunctioning of products such as measuring equipment and system equipment.
    Download (TCUU) PDF (499KB)

  • 2 (TCAL) Fixed Inductors / Page 2 0.075Ω ~ 26.0Ω 0.22μH ~ 1000μH The TCAL series is ideal for consumer electronics such as digital set-top boxes (DVB), digital video disc players (DVD), video cassette recorders (VCR), television (TV), computers, audio equipment, mobile communications, telephone, and various general-purpose electronic applications. The TCAL provides 0204,0307,0410, and 0510 size varieties of different forming, such as Normal & Short Form, F Forming, U Forming, Pana Forming, and bulk products to meet the needs of a variety of manufacturing methods.
    Download (TCAL) PDF (425KB)

  • 3 (TCDA) Large Current Power Inductors 0.4Ω ~ 9.8Ω 0.15μH ~ 4.7μH Token's TCDA Large Current Series power inductors feature with high current, low DC resistance, high frequency, easy heat dissipation, and high reliability advantages. Token utilizes the latest technology of diagonal through hole power inductor design enabling the most cost-effective propose in manufacturing TCDA Products.
    Download (TCDA) PDF (449KB)

  • 4 (TCRB) Radial Choke Coils 0.04Ω ~ 96.40Ω 10.00μH ~ 47000μH Token TCRB series structure with open magnetic circuit construction design and protect by UL or PVC Heat-shrinkable tube. The TCRB features with small size, space savings, low cost, wide inductance range, high Q value, high availability of a large induced current, high self-resonance frequency, small magnetic flux leakage and so on. Choke coils, also known as: Choke, differential mode inductors, is used to limit the alternating current through the coil, high-frequency and low frequency choke coils.
    Download (TCRB) PDF (402KB)

  • 5 (TCRC) Radial Choke Inductors 0.04Ω ~ 96.40Ω 10.00μH ~ 47000μH Token TCRC series structure with open magnetic circuit design and protect by UL or PVC Heat-shrinkable tube. The TCRC features with small size, high Q value, low cost, high self-resonance frequency, high availability of a large induced current, small magnetic flux leakage and so on. The TCRC is idael for notebook computers, inkjet printers, photocopying machines, display monitors, mobile phones, broadband modems, game consoles, color TV, VCR, camera, microwave ovens, lighting equipment, automotive electronics products.
    Download (TCRC) PDF (413KB)

  • 6 (TCRS) Radial Choke Shielded Inductors 0.08Ω ~ 35.00Ω 22.00μH ~ 10000μH Shielded inductor in a radial lead version offers significant space savings, wide inductance range. Ideal for use as an inductor for high current power supplies in all types of electronic instruments. Token TCRS series structure with magnetic shielded construction design and protect by UL or PVC Heat-shrinkable tube. The TCRS features with small size, space savings, wide inductance range, high Q value, low cost, high availability of a large induced current, high self-resonance frequency, small magnetic flux leakage and so on.
    Download (TCRS) PDF (383KB)

  • 7 (TC19) Through Hole Gap Toroidal Coils 0.093Ω 19.5μH Gapped toroidal coils usually require that the gap be filled with some type of insulating material to facilitate the winding process. Split core current coils can be assembled directly on a conductor while toroids must be passed over a disconnected end of the conductor. Toroidal inductors are electronic components with the high performers among inductors, typically consisting of a circular ring-shaped magnetic core of iron powder, ferrite, or other material around which wire is coiled to make an inductor. Their windings cool better because of the proportionally larger surface area. Toroidal inductors with a round core cross section are better performers than toroidal inductors with a rectangular cross section.
    Download (TC19) PDF (322KB)

  • 8 (TCPC) Power Chokes - - Token TCPC series structure with epoxy resin encapsulated mould sealed and are available with vertical and horizontal type. The TCPC features with small size, high Q value, low cost, high self-resonance frequency, high availability of a large induced current, small magnetic flux leakage. The TCPC is suotable for display monitors, camera, microwave ovens, lighting equipment, mobile phones, broadband modems, game consoles, color TV, VCR, notebook computers, inkjet printers, photocopying machines, automotive electronics products.
    Download (TCPC) PDF (307KB)

  • 9 (TC1213) Power Wirewound Inductors 0.0015Ω 0.68μH ~ 1.00μH Token has announced a wire-wound power inductor designed for use in the Mother Board of PC and Notebook and various other power devices. The TC1213, measures only 14.0 x 14.5 mm, with a maximum height of 9.5 mm. Most conventional DC-DC converters use inductors with cores made of relatively expensive metallic materials. By contrast, this product, with a ferrite material, realizes the same DC bias characteristics and other performance features as same-size inductors made with more expensive materials. The TC1213 offers customers much greater design freedom with large current and low DCR by meeting the need to replace power inductors.
    Download (TC1213) PDF (345KB)

  • 10 (TCLP/TCVP) Low DCR Inductors 0.21Ω ~ 1.60Ω 150μH ~ 1000μH Token Electronics Power Solutions has enhanced its toroidal surface-mount and radial lead inductor portfolios with the addition of four new ranges of RoHS compliant components. The surface mount (TCLP/TCVP) series are general-purpose radial leaded inductors suitable for providing high saturation flux density and higher current ratings applications such as those found in power supplies. The (TCLP/TCVP) series toroidal surface-mount inductors have compact overall dimensions with a maximum overall height of less than 13 mm and 21 mm. The toroidal construction of the new inductors aids design engineers by helping minimise EMI issues.
    Download (TCLP/TCVP) PDF (359KB)

  • 11 (TCAC) Air Core Coils, Spring Inductors Custom Custom Token manufactures all types of air coils inductors. Air Coils' another name is Spring Coils. Token's Air Core Coil TCAC Series has advantages of free from iron losses, non-linearity, single layer coils structure, low self-capacitance, and self-resonant frequency. TCAC's inductance is unaffected by the current it carries. This contrasts with the situation with coils using ferromagnetic cores whose inductance tends to reach a peak at moderate field strengths before dropping towards zero as saturation approaches.
    Download (TCAC) PDF (367KB)

  • 12 (TCB7T) Common Mode Choke Coils - - For designers seeking to suppress common mode noise on high speed differential signal lines, without distortion, Token has announced the TCB7T Series of compact through hole common-mode choke coils. Taking advantage of Token's advanced winding technology and superior ferrite materials, the TCB7T coils are ultracompact and provide accurate transmission of high-speed differential signals. Common mode choke coil circuits are increasingly being used for the effective suppression of common mode noise without distorting the waveform of high-speed signals. The TCB7T wirewound coils measure just 7.2 x 7.1 x 4.5 mm in maximum profile, with a tight ±0.5 mm dimensional tolerance, making them ideal for today's high speed products, particularly those incorporating double balance mixers, impedance transformers,broad-band transformers applications.
    Download (TCB7T) PDF (369KB)

  • 13 (TCTK) Power Toroidal Inductors - - Toroidal coils are electronic components with the high performers among inductors, typically consisting of a circular ring-shaped magnetic core of iron powder, ferrite, or other material around which wire is coiled to make an inductor. Their windings cool better because of the proportionally larger surface area. Toroidal inductors with a round core cross section are better performers than toroidal inductors with a rectangular cross section. With vertical base mounted Token TCTK series toroidal coils introduces advanced materials of iron core and special-purpose resins to produce the greatest inductance, high current, Lowest EMI, and Low cost. The TCTK is the most common kind of power inductors. Token TCTK utilizes closed magnetic circuit design enabling the lowest EMI and is suitable for Copying Machine, Display Monitor, ADSL Modem, Refrigerator, Laundry Machine, Microwave Oven, Car Electronics, Gaming Machine, Color TV, Video Camera, and Air Conditioner.
    Download (TCTK) PDF (334KB)

  • 14 (TCTC) Vertical base mounted Toroidal 30Ω ~ 71Ω 33μH ~ 140μH Toroidal inductors and transformers are electronic components with the high performers among inductors, typically consisting of a circular ring-shaped magnetic core of iron powder, ferrite, or other material around which wire is coiled to make an inductor. Their windings cool better because of the proportionally larger surface area. Toroidal inductors with a round core cross section are better performers than toroidal inductors with a rectangular cross section. Token's TCTC Toroidal Series manufactured by Low loss powdered iron cores offer the smallest size by volume and weight, and lower electromagnetic interference (EMI). Token toroidal can have higher Q factors and higher inductance than similarly constructed solenoid coils.
    Download (TCTC) PDF (365KB)

  • 15 (TCFB) Inductor Ferrite Beads - - Ferrite bead is a kind of anti-jamming applications the fastest growing components, cheap, easy to use, filtering high-frequency noise were improved significantly. Ferrite beads commonly used in filtering and electromagnetic noise reduction, Token's Ferrite Beads TCFB series manufactured by using iron, nickel, zinc oxide mixture made with high resistivity and high magnetic permeability. Ferrite bead in series with the signal or power path, it can be used to suppress differential mode noise.
    Download (TCFB) PDF (327KB)

  • 16 (TCWB) Wide Band Chokes - - Shown on the common-mode signal inhibits the growth of large inductor, but for differential-mode signal showing a small leakage inductance is almost ineffective. Choke coils used in a balanced circuit can effectively suppress common mode interference signals (such as lightning interference), while the normal transmission line differential-mode signal has no effect. Token's TCWB series use of insulation between the coil core winding method. To ensure that the transient over-voltage under the action of short circuit breakdown does not occur. And when the instantaneous high currents flowing through the coil, the core is not saturated. The wide band choke cores mainly used in the PC boards to filters the EMI from the outsides.
    Download (TCWB) PDF (346KB)

Magnetic Product Terminology & Glossary

Air Core Inductor (Ceramic Core Inductor)

Air core inductors are often referred to as "Ceramic Core" inductors. Air core inductor is most often used in high frequency applications where low inductance values, very low core losses and high Q values are required.

Ceramic has no magnetic properties. Thus, there is no increase in permeability due to the core material. Its main purpose is to provide a form for the coil. In some designs it also provides the structure to hold the terminals in place. Ceramic has a very low thermal coefficient of expansion. This allows for relatively high inductance stability over the operating temperature ranges.

Axial Inductor

An inductor constructed on a core with concentric leads on opposite ends of the core. Axial inductors are available for both power applications and RF applications, and are available in many core materials including the basic phenolic, ferrite and powdered iron types. Both rod and bobbin shapes are utilized. Axial inductors are very suitable for tape and reel packaging for auto placement.

RF Choke

Another name for a radio frequency inductor which is intended to filter or choke out signals.

What is Inductor?

A passive component designed to resist changes in current. Inductors are often referred to as "AC Resistors". The ability to resist changes in current and the ability to store energy in its magnetic field, account for the bulk of the useful properties of inductors. Current passing through an inductor will produce a magnetic field. A changing magnetic field induces a voltage which opposes the field-producing current. This property of impeding changes of current is known as inductance. The voltage induced across an inductor by a change of current is defined as:
Equation V = L di/dt where V (Induced Voltage); L (Inductance Value).
Thus, the induced voltage is proportional to the inductance value and the rate of current change.

DCR (DC Resistance)

The resistance of the inductor winding measured with no alternating current. The DCR is most often minimized in the design of an inductor. The unit of measure is ohms, and it is usually specified as a maximum rating.

EMI

EMI is an acronym for Electromagnetic Interference. It is unwanted electrical energy in any form. EMI is often used interchangeably with "Noise".

Ferrite Core

Ferrite is a magnetic material which consists of a mixed oxide of iron and other elements that are made to have a crystalline molecular structure. The general composition of ferrites is xxFe2O4 where xx represents one or several metals. The most popular metal combinations are manganese and zinc (MnZn) and nickel and zinc (NiZn). These metals can be easily magnetized.

Impedance

The impedance of an inductor is the total resistance to the flow of current, including the AC and DC component. The DC component of the impedance is simply the DC resistance of the winding. The AC component of the impedance includes the inductor reactance. The following formula calculates the inductive reactance of an ideal inductor (i.e., one with no losses) to a sinusoidal AC signal. Equation Z = XL = 2ΠƒL.
This equation indicates that higher impedance levels are achieved by higher inductance values or at higher frequencies.

Inductance & Tolerance

The property of a circuit element which tends to oppose any change in the current flowing through it. The inductance for a given inductor is influenced by the core material, core shape and size, the turns count and the shape of the coil. Inductors most often have their inductances expressed in microhenries (μH).

Tolerance Letter of Inductance Table
Letter Tolerance Inductance
F ± 1 % 1 henry (H) = 106 μH

1 millihenry (mH) = 103 μH

1 microhenry (μH) = 1 μH

1 nanohenry (nH) = 10-3 μH
G ± 2 %
H ± 3 %
J ± 5 %
K ± 10 %
L ± 15 %
M ± 20 %

Matched Impedance

The condition that exists when two coupled circuits are adjusted so that the output impedance of one circuit equals the input impedance of the other circuit connected to the first. There is a minimum power loss between two circuits when their connecting impedances are equal.

Multilayer Inductor

An inductor constructed by layering the coil between layers of core material. The coil typically consists of a bare metal material (no insulation). This technology is sometimes referred to as "non-wirewound". The inductance value can be made larger by adding additional layers for a given spiral pattern.

Quality Factor Q

The Q value of an inductor is a measure of the relative losses in an inductor. The Q is also known as the "quality factor" and is technically defined as the ratio of inductive reactance to effective resistance and is represented by: Equation Q = XL / Re = 2πƒL / Re
Since XL and Re are functions of frequency, the test frequency must be given when specifying Q. XL typically increases with frequency at a faster rate than Re at lower frequencies, and vice versa at higher frequencies. This results in a bell shaped curve for Q vs frequency. Re is mainly comprised of the DC resistance of the wire, the core losses and skin effect of the wire. Based on the above formula, it can be shown that the Q is zero at the self resonant frequency since the inductance is zero at this point.

Rated Current

The level of continuous DC current that can be passed through the inductor. This DC current level is based on a maximum temperature rise of the inductor at the maximum rated ambient temperature. The rated current is related to the inductor's ability to minimize the power losses in the winding by having a low DC resistance. It is also related to the inductor's ability to dissipate this power lost in the windings. Thus, the rated current can be increased by reducing the DC resistance or increasing the inductor size. For low frequency current waveforms, the RMS current can be substituted for the DC rated current. The rated current is not related to the magnetic properties of the inductor.

Saturation Current

The DC bias current flowing through the inductor which causes the inductance to drop by a specified amount from the initial zero DC bias inductance value. Common specified inductance drop percentages include 10 % and 20 %. It is useful to use the 10 % inductance drop value for ferrite cores and 20 % for powdered iron cores in energy storage applications.

The cause of the inductance to drop due to the DC bias current is related to the magnetic properties of the core. The core, and some of the space around the core, can only store a given amount of magnetic flux density. Beyond the maximum flux density point, the permeability of the core is reduced. Thus, the inductance is caused to drop. Core saturation does not apply to “air-core” inductors.

Self-Resonant Frequency (SRF)

The frequency at which the inductor's distributed capacitance resonates with the inductance. It is at this frequency that the inductance is equal to the capacitance and they cancel each other. The inductor will act purely resistive with a high impedance at the SRF point.

The distributed capacitance is caused by the turns of wire layered on top of each other and around the core. This capacitance is in parallel to the inductance. At frequencies above the SRF, the capacitive reactance of the parallel combination will become the dominant component.

Also, the Q of the inductor is equal to zero at the SRF point since the inductive reactance is zero. The SRF is specified in MHz and is listed as a minimum value on product data sheets.

Shielded Inductor

An inductor designed for its core to contain a majority of its magnetic field. Some inductor designs are self shielding. Examples of these are magnetic core shapes which include toroids, pot cores and E-cores. Magnetic core shapes such as slug cores and bobbins require the application of a magnetic sleeve or similar method to yield a shielded inductor.

It should be noted that magnetic shielding is a matter of degree. A certain percentage of the magnetic field will escape the core material. This is even applicable for toroidal cores as lower core permeabilities will have higher fringing fields than will high permeability toroidal cores.

Toroidal Inductor

An inductor constructed by placing a winding(s) on a core that has a donut shaped surface. Toroidal cores are available in many magnetic core materials within the four basic types: Ferrite, Powdered Iron, Alloy and High Flux, and Tape Wound. Characteristics of toroidal inductors include: self shielding (closed magnetic path), efficient energy transfer, high coupling between windings, and early saturation.

Measurements of Fixed Inductors

Inductance
The inductance is measured with a Q-meter, LCR meter or animpedance analyzer.

  • Fixed inductors for signals: Use of a Q-meter in which the frequency is for direct readout of the inductance or at the specified frequency.
  • Inductors for high current power line circuits: 1kHz or 100kHz.

Q Factor
The unloaded Q is measured with a Q-meter, LCR meter orimpedance analyzer. The frequency of measurement is that at which the inductance hasbeen measured or at a different frequency as specified. However, forhigh current power line inductors, the resistance is measured andthe Q may be neglected.

DCR (DC Resistance), SRF (Self-Resonant Frequency)
DCR: A digital multimeter is used for measurement;
SRF: Measured with a Q-meter, impedance analyzer or network analyzer.

Dielectric Strength
For specimen coil, apply 100V DC for 5 seconds between the shielding case and terminals. There should be no damage orabnormalities in the inductor.

Maximum Allowable Current
The maximum allowable current is a DC Current which causes initialinductance to decrease by 10% or 30%. Or coil temperature to rise by 20°C or 40°C, whichever is smaller. (Reference ambient temperature: 20°C)

Solderability
After immersion of terminals in flux for 5 to 10 seconds, dip theterminals in the solder bath at 245±5°C for 2±0.5 seconds. Makecertain that more than 3/4 of the surface of the terminals are coatedwith new solder.

Dry Heat Test
The change in inductance, if any, is measured after exposure to 85±2°C in a test chamber for 500±12 hours and for 1 to 2 hours at room temperature.

Shock Tests
The change in inductance, if any, is measured after the following tests.

  • Free Fall Drop Test: A specimen coil is mounted on a test board and dropped freely 3 times from a height of 1 meter.
  • Impact Tester: A specimen inductor is mounted on a test board and dropped 3 times in three directions with shock applied for 0.01 seconds at 981 m/s2. The change in inductance, if any, is measured after the tests.

Vibration Test
The change in inductance, if any, is measured after the following condition:

  • A specimen coil/inductor is mounted on a test board of vibration instrument.
  • Overall amplitude: 1.5mm, frequency range: 10~55Hz, and swept in the (10~55~10)Hz order per minute for 2 hrs
    in each of the 3 directions for total of 6 hrs.

Humidity Test
The change in inductance, if any, is measured after exposure in a test chamber to humidity of 90% to 95% R.H.
at 60±2°C for 500±12 hours and 1 hour exposure at room temperature.