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Differences between OPA4234U and OPA4234UA

Takashi Onawa
Genius 13200 points

Hi Team,

My customer wants to know the differences between OPA4234U and OPA4234UA.
Can you clarify that?

I can see some spec differences between OPA234U and OPA234UA in the datasheet. but it OPA4234 variant looks same.
Can we say the differences only MOQ or something?

Regards,

Takashi Onawa

  • 0
    Guru 317320 points

    This device was discontinued, so I doubt that you will be able to get more information that what is available from the datasheet.

    In theory, the P/U/E suffixes indicate the package type, and the A suffix indicates different electrical characteristics.

    The specifications table does not list the OPA4234P. And putting the OPA4234U on the right side is strange; having both U and UA with the same characteristics does not make sense. Apparently, whoever added the OPA4234 variants to the table made an error. It is likely that the OPA4234U has the same characteristics as the OPA234U and OPA2234U.

  • 0
    TI__Prodigy 730 points

    Hi Takashi-san,

    I hope you are well today. The A suffix, and the absence thereof, indicates the precision grade of the part. The OPA4234UA is tested to wider maximum limits. You'll notice the input offset voltage of the OPA4234UA is tested to 250uV-max, while the OPA4234U is tested to 100uV-max. This will affect other DC specifications (i.e. input bias current, PSRR, and CMRR), but AC specifications (bandwidth, noise, etc.) will remain the same for both devices. 

    Given that the OPA4234 is obsolete, can we offer a newer alternative? This will depend on your requirements, but the OPA4202 may fit the bill.

  • 0 in reply to Daniel Terrazas
    TI__Genius 13200 points

    Hi Team,

    Thanks for your comments.
    My customer is trying to switch to other device but they have not found good alternate device for this socket since their requirements is a little bit tricky...

    it looks U version has better performance on DC spec like Input offset and bias current.
    I found the description about the differences between U and UA as follow though, Do you think we can say U version shows better DC performance at dual supply condition only? 



    Regards,

    Takashi Onawa 

  • 0 in reply to Takashi Onawa
    Guru 140200 points

    Hi Takashi,

    this can be translated to a single supply voltage of +30V with a common mode input voltage at midsupply.

    Kai

  • 0 in reply to Takashi Onawa
    TI__Prodigy 730 points

    Hi Takashi-san,

    You are correct. The U grade is tested to tighter maximum specifications, while the UA grade has wider testing limitations. You will notice that you can expect the majority of devices to fall within the same specification though (i.e. the typical specifications may be the same). 

    As mentioned, the +/-15V conditions can be thought of as a +30V single supply with common-mode at mid supply (i.e. +15V). You can refer to the single supply testing conditions on the previous pages of the datasheet: 

    Best,

    Daniel