The USR-K3 is an ethernet Module made by USR IOT with 18 pins. -25℃~+85℃ 120mA 3V~3.6V Yes - Ethernet Modules ROHS.
PCBKit's library has its footprint (EasyEDA_Cloud:RJ45-TH_USR-K3, from EasyEDA), ready for a KiCad board. 316 are in stock at JLCPCB (part C5272914). 1 open-source board in 1 repository on GitHub use it.
The library has no symbol for this part yet.
jenna2004jna/ESP32-S3-WROOM-1-Custom-PCB-Design
This project presents a custom-designed PCB based on the ESP32-S3-WROOM-1 module, developed for embedded and IoT applications requiring reliable wireless communication, compact layout, and efficient power management.
<iframe src="https://pcbkit.io/embed/parts/usr-iot/USR-K3" title="USR-K3 in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/usr-iot/USR-K3.jpg" alt="USR-K3" width="1200" height="900">[](https://pcbkit.io/parts/usr-iot/USR-K3)Yes. the footprint EasyEDA_Cloud:RJ45-TH_USR-K3, both drawn on this page. PCBKit places them on a board for you when you design with it.
USR IOT publishes it: the Datasheet link on this page opens it.
JLCPCB lists it as part C5272914, with 316 in stock; the sellers' links on this page open their listings.
1 board in 1 repository on GitHub; the most starred are listed on this page, with their KiCad files.