B72580E1140S262 datasheet(77/81 Pages) EPCOS

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CTVS - Ceramic transient voltage suppressors

SMD multilayer varistors (MLVs), automotive E series

PPD ML PD

2021-01-08

Please read Cautions and warnings and

Page 77 of 81

Important notes at the end of this document.

Cautions and warnings

General

Some parts of this publication contain statements about the suitability of our ceramic transient voltage

suppressor (CTVS) components (multilayer varistors (MLVs)), CeraDiodes, ESD/EMI filters, leaded

transient voltage/ RFI suppressors (SHCV types) for certain areas of application, including

recommendations about incorporation/design-in of these products into customer applications. The

statements are based on our knowledge of typical requirements often made of our CTVS devices in

the particular areas. We nevertheless expressly point out that such statements cannot be regarded as

binding statements about the suitability of our CTVS components for a particular customer

application. As a rule, TDK Electronics is either unfamiliar with individual customer applications or less

familiar with them than the customers themselves. For these reasons, it is always incumbent on the

customer to check and decide whether the CTVS devices with the properties described in the product

specification are suitable for use in a particular customer application.



Do not use TDK Electronics CTVS components for purposes not identified in our specifications

and application notes.



Ensure the suitability of a CTVS in particular by testing it for reliability during design-in. Always

evaluate a CTVS component under worst-case conditions.



Pay special attention to the reliability of CTVS devices intended for use in safety-critical

applications (e.g. medical equipment, automotive, spacecraft, nuclear power plant).

Design notes



Always connect a CTVS in parallel with the electronic circuit to be protected.



Consider maximum rated power dissipation if a CTVS has insufficient time to cool down between

a number of pulses occurring within a specified isolated time period. Ensure that electrical

characteristics do not degrade.



Consider derating at higher operating temperatures. Choose the highest voltage class compatible

with derating at higher temperatures.



Surge currents beyond specified values will puncture a CTVS. In extreme cases a CTVS will

burst.



If steep surge current edges are to be expected, make sure your design is as low-inductance as

possible.



In some cases the malfunctioning of passive electronic components or failure before the end of

their service life cannot be completely ruled out in the current state of the art, even if they are

operated as specified. In applications requiring a very high level of operational safety and

especially when the malfunction or failure of a passive electronic component could endanger

human life or health (e.g. in accident prevention, life-saving systems, or automotive battery line

applications such as clamp 30), ensure by suitable design of the application or other measures

(e.g. installation of protective circuitry or redundancy) that no injury or damage is sustained by

third parties in the event of such a malfunction or failure. Only use CTVS components from the

automotive series in safety-relevant applications.



Specified values only apply to CTVS components that have not been subject to prior electrical,

mechanical or thermal damage. The use of CTVS devices in line-to-ground applications is

therefore not advisable, and it is only allowed together with safety countermeasures like thermal

fuses.

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