ESP32-S3-WROOM-1U-N16R8

ESP32-S3-WROOM-1U-N16R8 is the external-antenna variant of the Espressif ESP32-S3-WROOM-1 module family, listed in the ordering table of the official ESP32-S3-WROOM-1 and WROOM-1U datasheet: an ESP32-S3R8 SoC (dual-core Xtensa LX7 at up to 240 MHz with AI acceleration instructions) paired with 16 MB of Quad SPI flash and 8 MB of Octal SPI PSRAM in an 18.0 x 19.2 x 3.2 mm module. Instead of an on-board PCB antenna, the U variant routes RF to a U.FL/I-PEX connector, and it adds Wi-Fi 4 (2.4 GHz 802.11b/g/n), Bluetooth 5.0 LE with mesh, USB OTG, camera and LCD interfaces, and up to 45 GPIOs through the module pins. The selection point is memory plus antenna freedom: this is the maximum-memory S3 WROOM configuration for display, camera and audio workloads, and the external antenna keeps link budget when the product sits inside a metal enclosure or behind a panel. Selection advice: the R8 PSRAM grades are rated for ambient temperatures up to 65 °C only, so designs that must run at 85 °C should step to an R2 or no-PSRAM code instead; if the enclosure is plastic and board space allows the larger footprint, the PCB-antenna ESP32-S3-WROOM-1-N16R8 (also listed) removes the external antenna and its assembly cost.