Post Go back to editing

About insulation guarantee

ADuM1440'S Data Sheet ,Table 18 shows . Maximum Continuous Working Voltage1

I want to know that table18's guarantee is under Tj<150 ℃ (useing table 17 condition)?

or limited condition?

  • Hello OTI

    The short answer is yes.

    Our insulation lifetime is what determines our working Voltage.  Hot is not the worst case condition that determined that lifetime.

    Best Regards,

    MSCantrell 

  • I guess from a datasheet of ADuM1441 that the insulation depends
      only on "Safety Limiting Values" in Table 14.

    Our Customer need National Electrical Code.

    Certification organization request document of letter
      or declaration issued by Analog Devices.

    could you give me a document of letter or declaration 

    saying as  follows:
     

    The insulation depends only on "Safety Limiting Values".
     No other parameters except "Safety Limiting Values" are relevant  to the insulation.
    "Safety Limiting Values" contains only Case temperature and Total  power dissipation shown in Figure 4.

  • Hello OTI,

    We maintain UL certification to UL1577 to address US electric code requirements.  You can download this certification on our web site, there is a link from the product page..

    All parameters are guaranteed over the full operating temperature.  The insulation can actually survive higher temperatures than the max junction temperature without deterioration.  The mold compound upt tpo about 300C and the polyimide up to about 500C.  Based on this we could provide such a letter, but we would rather utilize the available documentation.

    Is this an Intrinsic Safety application?  If so we will have an ATEX certification on this device shortly.

    Best Regards,

    MSCantrell

  • Thank you Very much MSCantrell.

    Yes, application is Intrinsic Safety,Smart valve positioner.
    It's need  insulation between 2 power supply circuits.

     

  • Thank you Very much MSCantrell.

     

    Yes, application is Intrinsic Safety,Smart valve positioner.
    It's need  insulation between 2 power supply circuits.

     

    Our Customer need submit document Certification organization.

    So could you give me document ?

     

     

  • Hi,MSCantrell

    Could you give me pdf file written  above letter?

    Becouse  Certification organization request  file what ADI  guaranteed this.

  • The documants we have are still in draft form.  CSA/SIRA has said that they can get them finalized next week.  The drafts can not be used for official certification, so please give me another week to get the final documants to you. 

    Best Regards,

    MSCantrell

  • Hi,MSCantrell

    Thank you for an answer.

    My reuquest document is not CSA/SIRA.

    You send me letter

    "All parameters are guaranteed over the full operating temperature.  The insulation can actually survive higher temperatures than the max junction temperature without deterioration.  The mold compound upt tpo about 300C and the polyimide up to about 500C.  Based on this we could provide such a letter, but we would rather utilize the available documentation.

     

    Please give me the contents mentioned above with a file.

     

    The reason is:

    Certification organization say that

    >>>>  > We guess from a datasheet of ADuM1441 that the insulation depends

    >>>>  > only on "Safety Limiting Values" in Table 14.

    >>>>  > We are not sure about the above, so need another document of letter

    >>>>  > or declaration issued by Analog Devices.

    >>>>  > We kindly ask you to get any document from Analog Devices saying as

    >>>>  > follows:

    >>>>  > - The insulation depends only on "Safety Limiting Values".

    >>>>  > - No other parameters except "Safety Limiting Values" are relevant

    >>>>  > to the insulation.

    >>>>  > - "Safety Limiting Values" contains only Case temperature and Total

    >>>>  > power dissipation shown in Figure 4.

    >>>>  > --- End here