2.4 GHz WiFi module with 4 MB flash and 336 KB SRAM
The ESP32-S2-SOLO-2U-N4 is a single-core WiFi module from the ESP32-S2 series, integrating a 2.4 GHz radio supporting 802.11b/g/n at up to 150 Mbps. On-chip memory includes 4 MB flash, 128 KB ROM, and 336 KB SRAM — enough headroom for a TCP/IP stack and application logic without external memory in many IoT endpoints. Receiver sensitivity hits -97 dBm, and the transmit chain delivers 19.5 dBm output power. For a battery-powered sensor that needs to push data through a wall or across a warehouse floor, that link budget buys range margin without a separate PA.
Industrial temperature and current draw for battery design
An outdoor gateway or engine-bay telematics unit that sees 75°C on a summer roof still has margin before the silicon hits its upper limit. Receive current is 71–75 mA; transmit current ranges from 165 mA to 310 mA depending on output power setting. In a duty-cycled application (wake, send, sleep), the average draw is dominated by the sleep current — the module's own deep-sleep current is not listed here, but the active-mode numbers let you size the battery for the worst-case burst. The serial interface set (ADC, GPIO, I²C, I²S, SPI, PWM, UART, USB) means most sensor and actuator peripherals connect without a level shifter or external bridge.
The module ships in cut tape or bulk — specify the packaging preference at quote time.