This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS23785B: Support 25W~30W PD with certified for UL294B?

Part Number: TPS23785B
Other Parts Discussed in Thread: TPS2378, TPS23756, TPS23754, TPS23752, TPS23751


I'm looking at TPS23785B to support 25W~30W (IEEE802.3at) PD (Powered Device) and would like to know if this device can meet UL294B standard.

If not, which device can support

1) PD 25W~30W

2) IEEE802.3at

3) Meet UL294B standard

Please share if there is a reference design on this.


Best regards,

Gim Song

  • Hello Gim.

    There are several PoE PD devices in the TI portfolio which support up to 25.5W (Class 4) power. These include the TPS23785B, TPS23751, TPS23752, TPS23754, TPS23756, and TPS2378. They can extend their reach up to 30W with an optional boost circuit...or you could move up to our next generation of IEEE802.3bt-ready devices - TPS2373-4, TPS2373-3, TPS2372-4, and TPS2372-3.

    Do you need > 25.5W at the input to your design?

    Your second and third criteria are not IC specific/controlled. Both the IEEE802.3at and UL294B standards are something one meets at a design level - meaning any of these devices listed are capable of meeting them.

    I will assign this thread to our Application Engineer - Darwin Fernandez - to see if he is aware of any designs proven to pass the UL294B standard. I am not aware of any personally.

    That requirement aside, you can search our broad portfolio of IEEE802.3at compliant designs found in our TI DESIGNS portfolio here --> If you search for "Class 4 PoE," over 30 designs will be found.

    You could start with one of those designs (that meet your voltage/current/efficiency specifications most closely) and then work toward modifying and meeting the UL294B requirements.

    Thank you for considering our PoE solutions,
  • Hi Gim Song,

    UL certification is typically not necessary at the PD side of the cable. In general, it is done for sourcing end equipments. For example, for a PSE with an integrated FET, UL testing can be done. The reliability engineer will usually know whether it will be a required certification for that end equipment or not.