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AM26LV31E: are the "E" versions of AM26LV3x compatible with the non-E versions?

Bernhard Wandernoth
Prodigy 10 points
Part Number: AM26LV31E
Other Parts Discussed in Thread: AM26LV31, AM26LV32

A while ago, we added separate ESD and EMI protection to the line interface so that the "E" feature of the AM26LV31 and AM26LV32 are not required anymore. 

Question: are the non-E versions 1:1 compatible? I found various differences in the datasheets.

Thank you :)

    Bernhard

  • +1
    TI__Guru 52022 points

    Hi Bernhard,

    The answer is that "it depends on use case". From a purely data-sheet point of view they are not 1 to 1 - but very close. 

    Essentially the biggest difference is the IEC ratings that the "E" version is rated to + the non-E version is available in 0 to 70 C options as well as -45C to 85C. In terms of performance they should perform very similar and have similar if not the same performance specs. If the IEC ratings are no longer needed for the design then it shouldn't be much of a concern to switch (as long as the non-E version chosen has the right temp range).

    That being said - is there any specification/parameter that you are concerned about with switching the parts beyond the IEC ratings ?

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    Prodigy 10 points

    thank you so much!!

    Looking at the datasheet, I think what got me confused was the definition of Vod, which seemed to be twice the value for the "E" versions. I suppose that one means the peak value, the other the p-p value. The graphs Figure 11 in the E datasheet and Figure 8 in the non-E show the same amplitudes, though. 

    I was wondering if we need to re-qualify before 1:1 replacement for our next production batch. Seems that we are good Slight smile

    Best,

        Bernhard

  • 0 in reply to Bernhard Wandernoth
    TI__Guru 52022 points

    Hi Bernhard,

    Yes - so this is a difference between the parts - in many applications the lower Vod doesn't make that much of a difference - really it will come down to the max length of the bus will be reduced as there is potentially too much attenuation for a smaller starting voltage. The applications curves  will look similar at shorter bus lengths - I don't think our figures state the length of the bus in either data sheet so I'd assume its shorter due to this difference. This "technically" isn't RS-422 compliant the non-E version is "similar to RS-422" and this is that area.  

    If your system is heavily loaded with the devices and/or has long cables requalification may be needed as the lower output voltage could possibly cause unwanted issues.


    Best,

    Parker Dodson