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TPS23841: TPS23841 Suitability for new designs.

Liam O'Donnell
Prodigy 105 points
Part Number: TPS23841
Other Parts Discussed in Thread: TPS23861, TPS2388, TPS23880

Hi,

We've recently developed a couple of prototypes of a PCB that uses the TPS23841 and have just been writing software to interface with the device.

I came across a couple of forum posts when searching for the TPS23841 where some TI engineers are not recommending that device, yet the main website for the device states the part as ACTIVE. I was hoping to get some clarification on whether this part is suitable for new designs, or whether we should be looking at an alternative.

Thank you in advance for any information on this.

  • 0
    TI__Expert 5615 points
    Hello user5359653.

    The TPS23841 is not recommended for new designs as it is not compliant with the current standard (IEEE802.3at). You can see that via our Special Note on the top of the product page. With that said, it is an ACTIVE device...and, if designed in, we will support you.

    Thank you for your consideration of PoE Products from TI,
  • 0 in reply to Thomas Lewis
    Prodigy 105 points
    Hi Thomas,

    Thank you for your help.

    As you're not recommending the device, do you have any estimates of when the device may enter end-of-life?

    We do currently have the opportunity to make changes to the design at this stage, but if we do choose to continue with it, I would like to know if we are able to secure supply of the device over the estimated lifespan of the product .

    Once again, thank you for the information.
  • 0 in reply to Liam O'Donnell
    TI__Expert 5615 points
    We take End of Life decisions very cautiously as we understand the impact on our customers. As such, any project which drives significant, steady, volume on a device will likely prevent obsolesce (unexpected manufacturability issues aside). In addition, once an official obsolescence is issued we always include the ability to make a lifetime buy.

    With that said, unless you have some specification parameter, feature set, or other clear reason to stick with the TPS23841, I recommend moving to the TPS23861 or TPS2388. Both will offer you a lower system price (even when taking into consideration the need to purchase external FETs in both cases), deliver IEEE802.3at compliance, and provide longer product life.

    We will support you either way, but...if not too late...I strongly recommend moving to the TPS23861 or TPS2388 (if 8 power ports are required).

    Thanks,
  • 0 in reply to Thomas Lewis
    Prodigy 105 points

    Hi Thomas,

    Our application actually uses two TP23841's to achieve 8 power outputs, on the face of it the TPS2388 sounds like a good choice.

    Thank you for the recommendations and the information you've provided. It's been a big help.

  • 0 in reply to Liam O'Donnell
    TI__Expert 5615 points
    Welcome - we are happy to help.

    When looking to decide between the TPS23861 and TPS2388, the features to look at closely would be: autonomous mode and lower price per port (TPS23861) versus 8 power channels, port remapping, and easier transition to IEEE802.3bt compliance solution TPS23880 (TPS2388).

    Let us know if having any questions once you have studied the two options.

    Thanks,