Wi-Fi connectivity with on-chip memory headroom
The ESP32-S2-MINI-2U-N4R2 is a compact 2.4 GHz Wi-Fi module from the ESP32-S2 family, built around the ESP32-S2FN4R2 IC. It integrates 4 MB flash and 2 MB PSRAM on the module substrate, plus 128 kB ROM and 336 kB SRAM on the die, giving the application stack room for TLS stacks, OTA update buffers, and high-resolution sensor data without external memory.
Industrial temperature grade and receiver sensitivity
The receiver sensitivity of -97 dBm (typical at 1 Mbps DSSS) maintains link margin in high-attenuation environments like metal cabinets or concrete walls — a 3 dB advantage over many 802.11b/g modules at the same data rate. Transmit power reaches 19.5 dBm at the antenna port, which is the regulatory ceiling for 2.4 GHz in most regions. The current draw during transmission ranges from 160 mA to 310 mA depending on output power setting and data rate; the receiving current sits between 63 mA and 68 mA. Serial interfaces include ADC, GPIO, I²C, I²S, SPI, PWM, UART, and USB — the USB peripheral supports direct programming and a CDC virtual COM port, eliminating the need for an external UART-to-USB bridge during development and in-field firmware updates.
Espressif lists this module as Active (current production). There is no announced end-of-life or last-time-buy window. The 56-VFQFN exposed-pad package is standard for reflow assembly — no special moisture sensitivity beyond the factory floor label.