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OPA316: Pin Configuration and Functions (SC70/SOT23)

Vladimir Zabodskii
Prodigy 30 points
Part Number: OPA316
Other Parts Discussed in Thread: OPA837, LMH6601, OPA838, , TLV9062, TLV9002

Dear Sirs, could you clarify the correctness of the different configurations for the SC-70 and SOT23 please.

Datasheet SBOS703F –APRIL 2014–REVISED OCTOBER 2016 page 4.

And last question if this picture is correct.

What are the reasons for these differences between SC and SOT configurations?

(except to facilitate the life of the designer)

For example: -in near -V in the SC case.

Best regards,

Vladimir.

  • Former Member
    0 Former Member

    Hello Vladimir,

    As to your first question: this should be the correct pinout for these packages.  I say this for two reasons.  First, the datasheet has been released for almost five years now.  So, it is highly unlikely that there would be a serious mistake like this.  Second, this is a standard pinout for these packages.  If you look at the datasheets for two of our newest parts, TLV9002 (page 6) or TLV9062 (page 6), you will see that the single channel packages have the same pin configurations.

    Are you having some type of issue with parts that made you doubt the datasheet?

    As to your second question, the answer is similar to the first.  The packages are made this way primarily to comply with industry standards.  This makes it easier for customers to drop in and replace parts pin-to-pin.  You will see that there is one standard SC70 package and three standard SOT-23 packages: normal, "U," and "R."

    Regards,

    Daniel

  • 0 in reply to Former Member
    Prodigy 30 points
    Hello Daniel,

    Thank you for the fast detailed reply.

    1. I am not sure, that this is a standard pinout for SC-70, perhaps this is one of standard pinouts for SC-70. For example LMH6601, OPA837, OPA838 have another pinout for SC-70, as I see.

    2. Concerning datasheets, I have experience with the graphic pinout error for a die in datasheet (another supplier). And cause of it I asked the question.

    3. Concerning the customer comfort. It was not very expected to see a different pinouts for SOT and SC packages. Because sometimes there are situations to replace with a SOT to SC or conversely for the one product. And before I found no problem with replacing the packages until this time. Moreover, the location of the (-V) near (-in) does not allow the guard ring to be made in the case of symmetrical power supply for SC-70 (imho).

    Nevertheless, I understand that there are no universal solutions and I am grateful for your attention and help.

    Regards,
    Vladimir.
  • Former Member
    0 Former Member in reply to Vladimir Zabodskii
    Hello Vladimir,

    I have dug into this issue a bit more and discussed the matter with a systems engineer and former designer on my team. Here are my findings:

    1. I think you are correct in saying that there are multiple standard pinouts for SC70, rather than one standard. After examining my team's product portfolio, it appears that there are two common configurations. The "southeast" configuration, which is used by OPA316 as well as the TLV9002 and the TLV9062 I referenced above, is actually the more common of the two in this amplifier portfolio. Less common is the "northwest" configuration shown by the LMH6601, OPA837, and OPA838.

    However, I am not sure which of the configurations is more popular in other amplifier portfolios or even for other suppliers. The LMH6601, OPA837, and OPA838 parts actually belong to a different amplifier team (High-Speed) and they may make more parts in the NW configuration. My apologies if my previous answer was misleading.

    2. I have examined the mount and bond diagrams for the SC70 and SOT-23 OPA316 parts and they match each other. They do correspond with the pinouts listed in the datasheet. So, I would not worry about this being a systematic design issue.

    3. I can see why it would be advantageous to have the same pinout for the two different packages. Unfortunately, it looks like we only make the one SC70 pinout and the one SOT-23 pinout for this part. If this is a deal breaker for the part, then I can help you find a different part. If you have any layout questions, I can get someone to help with that as well.

    All the best,
    Daniel
  • 0 in reply to Former Member
    Prodigy 30 points

    Hello Daniel,

    Thanks a lot, for detailed reply. Currently there are no questions or unclear points.

    Good luck,

    Vladimir.