Question 1

Where can chip beads be used to serve as effective EMC components?

Accepted Answer

A. Chip beads are elements that easily eliminate noise by being inserted in a series in transmission lines which are often sources of noise radiation. Due to their convenience, chip beads are used in a wide variety of instruments. For signal lines and power lines which require EMC countermeasures, inserting chip beads in a series will eliminate noise. TDK's extensive lineup of chip beads includes micro-miniature products, Gigaspira-structured products that provide high impedance at GHz bands, products that are compatible with high currents in power lines, and products that are compliant with AEC-Q200 for in-vehicle use.

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Question 2

Since chip beads are EMC components&#44 is there any need to make ground connections?

Accepted Answer

A. Ground connections are not needed.
Chip beads are different from bypass capacitors and 3-terminal filters, which induce noise on ground, in that they absorb noise with the resistance component R to convert it into heat.

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Question 3

Would it be a problem to use chip beads in parallel?

Accepted Answer

A. It is possible to use chip beads in parallel.
When chip beads are used in parallel, a greater amount of current can flow.
However, there is the disadvantage that impedance value will decrease, as it is a synthetic impedance.
The synthetic impedance Zt can be obtained using the following formula:

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Question 4

There are no marks on chip beads that indicate winding direction (polarity). Do different directions at mounting result in changes in characteristics?

Accepted Answer

A. Mounting direction has no effect on characteristics as chip beads have no polarity.

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Question 5

Does TDK offer chip bead arrays (products that have multiple elements in one package)?

Accepted Answer

A. Currently, TDK does not manufacture array-type chip beads. For more information, please refer to product lineups and selection guides published by TDK for an overview of our chip beads.

Question 6

Would it be safe to use a chip bead in which a current exceeding the rated current flows momentarily?

Accepted Answer

A. The size of the current changed depending on the time that current is applied.
If you inform TDK of usage conditions (current value and time) at your company, we can respond regarding approximate standards for use.
Please send inquiries to your nearby sales office or distributor, or send inquiries from this website.
Your company is responsible for final confirmation using conditions at your company.

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Question 7

What is the Gigaspira bead?

Accepted Answer

A. It is a chip bead that decreases stray capacitance more than standard chip beads by changing internal structures, and has extended the SRF to the high-frequency side.
Because it can remove noise at higher-frequency bands, it can be used alone for high-frequency and broadband noise, without the need for two chips.

Relationship of the internal structure to the SRF
Comparison of standard chip beads and Gigaspira
Beads: impedance and frequency characteristics

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Question 8

What happens when a current exceeding the rated current is applied to chip beads?

Accepted Answer

A. Applying a current exceeding the rated current leads to a disconnection or short circuit (damaged chip) when the current limit value is reached. The breakdown current value is determined by the applied current and number of times it is applied, and the limit value varies according to factors such as the characteristic variations of the product and the environment (particularly the temperature) that the product is used in.

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Question 9

The data sheet has specifications on “rated currents” but not on “rated voltages”. Should there be no problems during use as long as the current values are conformed to?

Accepted Answer

A. There is no problem with chip beads when used within the scope of rated current. Therefore, there are no tolerance specifications for insulation breakdown.

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Question 10

Can mounting chip beads for the low-frequency band in series with the chip beads for the GHz band allow the obtaining of both characteristics? Also&#44 should there be any problems if multiple chip beads are mounted in series?

Accepted Answer

A. Both characteristics can be obtained by connecting them in series. (It will be as if two electrical characteristics are overlayed.) A disadvantage is that the series resistance value rises and the voltage drop occurs.

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Question 11

Please provide specifications of the withstand voltage of the MMZ series.

Accepted Answer

A. The following pressures are stipulated for ESD (electrostatic discharge).
MM：200V
HBM：2kV

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Question 12

What differences arise in terms of electrical characteristics if there are any cracks in chip beads?

Accepted Answer

A. There is the possibility of differences in the frequency characteristics of the impedance even if there are no changes in resistance values. Ferrites have a characteristic where μ changes when stress is applied. Therefore, when there is cracking in chip beads, the stress of the entirety changes and it causes changes in impedance.

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Question 13

How can I differentiate between commercial grade and automotive grade chip beads from TDK?

Accepted Answer

A. TDK chip beads can be categorized by the management symbol listed in the product number.
Please refer to the catalog for information on the management symbol.
However, no impressions are printed on products themselves, so differentiation is not possible by looking at the product exterior.

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Chip Beads Catalog

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Question 14

Please describe the prescribed conditions of rated currents.

Accepted Answer

A. They are prescribed in accordance with temperature rise values during direct-current energizing.
For purposes of reference, the prescribed rated current is roughly 10°C with the MMZ series and roughly 40°C with the MPZ series.

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Chip Beads Search by Characteristics

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Question 15

How should I select chip beads?

Accepted Answer

A. TDK provides a characteristic value search function and publishes selection guides as tools for selecting products based on dimensions, electrical characteristics, and application.

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Search by Characteristics

Chip Beads Search by Characteristics

product Lineup

Chip Beads product Lineup

Selection Guides

Chip Beads Selection Guides

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Question 16

At what frequency is “impedance”&#44 which is the representative feature of chip beads&#44 prescribed?

Accepted Answer

A. Impedance at 100MHz is generally prescribed.
Impedance at 1GHz is prescribed for the Gigaspira bead, which is also effective at high-frequency bands.
Furthermore, frequency ranges with noise suppression effects can be changed by selecting chip beads with different ferrite materials, even if impedance levels at 100MHz are equal.

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Question 17

What is an R-X cross point?

Accepted Answer

A. Chip beads consist of the reactance component X and the resistance component R. The X component reflects noise in its dominant areas and the R component absorbs noise in its dominant areas. This results in the conversion of noise into heat.
The frequency where the R component and X component are equal is known as the R-X cross point. The frequency band from the R-X cross point to the impedance peak is the most effective in reducing noise.

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Question 18

What is derating?

Accepted Answer

A. Derating is lowering the standards of the rated current of chip beads when the ambient temperature is high.
Since chip beads for power lines generate great heat when the rated currents flow, the rated currents at high temperatures are derated.
The catalog lists information on derating for chip beads used with power lines.

Example of derating listed in catalog

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Question 19

Where can I see the impeadance value for the frequency at which I would like to use the chip beads?

Accepted Answer

A. You can see the impedance value in the characteristics graph displayed on the bottom of the detailed product data page.

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Chip Beads Search by Characteristics

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Question 20

Are products in the MPZ series compliant with the amended EU RoHS (RoHS2) directive?

Accepted Answer

A. Products in the MPZ series do not contain any of the 10 substances (lead, mercury, cadmium, hexavalent chromium, PBB, PBDE, DEHP, BBP, DBP, DIBP) listed in ROHS2. The environmental response page lists the status of response to environmental standards and environmentally-friendly products at TDK.

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Status of TDK’s Environmental Responses

Status of TDK’s responses to various environmental standards and measures regarding environment-conscious products

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Question 21

Is red phosphorus used in TDK chip beads?

Accepted Answer

A. There is no intentional use of red phosphorus in TDK chip beads.

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Question 22

Do the chip bead products of TDK support lead-free soldering?

Accepted Answer

A. Information on the status of environmental response is available in the catalog and Detailed Information page. You can also send inquiries to your nearby sales office or distributor, or send inquiries from this website

Example of catalog listing

Example of Detailed Information page

Also, the environmental response page lists the status of response to environmental standards and environmentally-friendly products at TDK.

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Chip Beads Search by Characteristics

Catalog

Chip Beads Catalog

Status of TDK’s Environmental Responses

Status of TDK’s responses to various environmental standards and measures regarding environment-conscious products

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Question 23

What is the FIT (Failures in Time) of your chip beads?

Accepted Answer

A. Values are calculated separately for each product. The following information is required to calculate the failure rate. Please provide this information to your nearby sales office or distributor, or send information from this website.

Product number
Usage (example: smartphones, industrial robots, automobile engine units, etc.)
Average usage temperature
Average daily usage time

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Question 24

Please describe the failure mode of chip beads.

Accepted Answer

A. Failure modes of chip beads can be broadly divided into disconnections or short circuits. TDK's lineup also includes soft termination products which can alleviate mechanical stress with high reliability against thermal shock.
You can refine your search for soft termination products by specifying “Advanced Search” – “Search by Characteristics” for the characteristic value search.
>>Refined search results for soft termination products

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Chip Beads Search by Characteristics

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Question 25

Can they be washed?

Accepted Answer

A. Yes, they can be washed. The conditions recommended by TDK are as shown below.

Cleaning solution	Isopropyl alcohol
Condition	Ultrasonic cleaning

[20W/l or below at 28kHz to 40kHz for 5 min or less at room temperature]

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Question 26

Do chip beads make squeaking noises like multilayer ceramic capacitors? What should be done if any squeaking noises are produced?

Accepted Answer

A. They may produce squeaking noises due to the magnetostrictive properties of magnetic materials. However, these squeaking noises are generally found only at high currents and the possibility of chip beads with low rated currents producing these sounds is low.

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Question 27

Is S-para information available?

Accepted Answer

A. S-parameter, equivalent circuit model, SPICE model, as well as simulator libraries are offered as the ”TVCL” (TDK Virtual Component Library) in the Technical Support page.You can also download it from the search result list page or the product details page.

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TVCL - TDK Virtual Component Library

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Question 28

What are technical support tools?

Accepted Answer

A. These tools are to help you design virtual circuits. They include multi-purpose simulator models using S-parameters and Netlists, models for other commercial simulators, and "SEAT," which is a component characteristic analyzing software.

Question 29

Why should I use these technical support tools?

Accepted Answer

A. Recently, electrical circuits designs use simulation technology. In order to improve simulation accuracy, it is very important to acquire a simulation model that is as close as possible to the actual usage. For example, when a 1uF capacitor is used, ESR (Equivalent Series Resistance) and ESL (Equivalent Series Inductance) differ depending on the size. Therefore, if you create a circuit using the ideal capacitor determined by simulation, actual results may be very different. By using a simulation model, you can attain results that are as close as possible to actual phenomena.

Question 30

What kinds of technical support tools are available?

Accepted Answer

A. We provide a multi-purpose model for other commercial simulators using S-parameters, equivalent circuit models, and Netlists.
We also have an exclusive model for simulators from other companies such as ADS from Agilent Technologies, Ansoft Designer&NEXXIM from Ansoft, Microwave Office from AWR, and Allegro PI from Cadence. This exclusive model is easier to use than the multi-purpose model.
In addition, “SEAT,” a component characteristics analyzing software that is equipped with functions for displaying and simulating various component, is also available.

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