ESP32-S0WD QFN-48-EP (5×5mm) Espressif Single-Core 2.4G WiFi BLE Dual-Mode IoT Transceiver SoC Chip

ESP32-S0WD Product Overview

ESP32-S0WD is Espressif single-core IoT SoC in QFN-48-EP exposed pad package, 5×5mm. Equipped with Xtensa LX6 single-core MCU, integrated full 2.4GHz WiFi 802.11 b/g/n + Bluetooth 4.2 dual-mode RF, 520KB SRAM. It integrates RF balun, PA, LNA and power management circuit. Full peripherals available, compatible with ESP-IDF & Arduino, ideal for cost-sensitive IoT wireless projects with moderate computing requirement.

ESP32-S0WD Key Features

The ESP32-S0WD features an Xtensa® single-core 32-bit LX6 microprocessor running at up to 240MHz. On-chip memory includes 448KB ROM, 520KB SRAM, and 16KB RTC SRAM. The chip does not include embedded Flash and requires external Flash/SRAM via the QSPI interface (supports up to 4×16MB).

The ESP32-S0WD supports 2.4GHz Wi-Fi (IEEE 802.11b/g/n) with 802.11n data rates up to 150Mbps. It supports A-MPDU and A-MSDU frame aggregation and 0.4μs guard interval. Output power reaches up to 20.5dBm, with receiver sensitivity down to -98dBm. It supports Bluetooth v4.2 including Classic Bluetooth (BR/EDR) and BLE. Wi-Fi and Bluetooth share the same antenna with a built-in coexistence mechanism.

The ESP32-S0WD provides up to 34 programmable GPIO pins. Digital interfaces include SD card, UART, SPI, SDIO, I2C, LED PWM, motor PWM, I2S, IR, pulse counter, capacitive touch sensor, ADC, DAC, and TWAI® (compatible with ISO 11898-1, CAN Specification 2.0) .

The ESP32-S0WD features fine-grained clock gating, power-saving modes, and dynamic voltage scaling for power management. Operating voltage range is 2.3V ~ 3.6V, with temperature range of -40°C ~ +125°C. TX current is 240mA, and RX current is 95mA.

The ESP32-S0WD supports Secure Boot and Flash Encryption, with hardware accelerators for AES, SHA, and RSA. It supports Station, SoftAP, and Station+SoftAP modes, with antenna diversity and Beacon auto-monitoring (hardware TSF) .

ESP32-S0WD Applications

With its ultra-compact 5×5mm package, single-core low-power design, and dual-mode wireless connectivity, the ESP32-S0WD is widely used in:

Smart Home & Consumer Electronics: Smart lighting, smart plugs, smart switches, smart locks, thermostats

Industrial Control & Automation: Industrial sensors, equipment monitoring, remote data acquisition

IoT Sensor Nodes: Low-power sensor hubs, environmental monitoring, data loggers

Wearable Devices: Smart bands, fitness trackers

Smart Medical Devices: Portable medical devices, health monitors

Battery-Powered Devices: Low-power IoT devices

ESP32-S0WD Advantages and Highlights

The ESP32-S0WD is the only single-core processor variant in the ESP32 family, offering lower power consumption and more competitive cost compared to dual-core models. Its core advantages lie in the 5×5mm ultra-compact package and single-core low-power design, optimized for cost-sensitive, space-constrained IoT applications.

Ultra-Compact 5×5mm Package, Saving PCB Space: The ESP32-S0WD features a 5×5mm QFN package, smaller than standard ESP32 chips (6×6mm), making it ideal for space-constrained compact product designs.

Single-Core Low Power for Battery-Powered Devices: The single-core LX6 processor delivers 200 MIPS at 240MHz, meeting the computing needs of most IoT applications while maintaining lower power consumption.

34 GPIOs and Rich Peripherals: Despite the ultra-compact 5×5mm package, the ESP32-S0WD offers 34 programmable GPIOs with UART, SPI, SDIO, I2C, I2S, PWM, ADC, DAC, and CAN 2.0 interfaces.

Dual-Mode Wireless + Bluetooth 4.2: Supports 2.4GHz Wi-Fi (802.11 b/g/n, up to 150Mbps) and Bluetooth v4.2 dual-mode communication. Output power up to 20.5dBm and sensitivity down to -98dBm.

Industrial-Grade Wide Temperature: Operating temperature range of -40°C ~ +125°C for harsh environments.

ESP32-SOLO-1 Module Core Chip: This chip is the core processor of the official ESP32-SOLO-1 module, with mature module-level validation and complete software ecosystem support.

Comprehensive Hardware Security: Supports Secure Boot, Flash Encryption, and AES, SHA, RSA hardware accelerators.

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FAQs:

1. Question: What is the ESP32-S0WD?
   Answer: It is a single-core variant of the ESP32 series, designed to reduce cost and power consumption while retaining the full set of peripherals and wireless capabilities of the dual-core versions .

2. Question: What is the core processor performance?
   Answer: It features an Xtensa 32-bit LX6 processor running in a single-core configuration, offering a processing capacity of 200 MIPS .

3. Question: What wireless protocols does it support?
   Answer: It supports IEEE 802.11 b/g/n Wi-Fi (up to 150 Mbps) and the Bluetooth v4.2 standard, including both BR/EDR and Low Energy (BLE) .

4. Question: What internal memory resources are available?
   Answer: The chip integrates 520 KB of SRAM, 448 KB of ROM, and 16 KB of RTC SRAM for secure boot and power management .

5. Question: Does it support external flash?
   Answer: Yes, it uses a QSPI interface to connect to an external SPI flash chip for program storage .

6. Question: How many GPIO pins are available?
   Answer: It provides 34 programmable GPIO pins, which can be configured for digital I/O, ADC, DAC, touch sensors, and various communication interfaces .

7. Question: What are the transmission parameters?
   Answer: The maximum transmit power is approximately 20 dBm (or 20.5 dBm), with a receive sensitivity of -98 dBm .

8. Question: What is the operating voltage and temperature range?
   Answer: The supply voltage range is 2.3V to 3.6V, and it operates across an industrial temperature range of -40°C to +125°C .

9. Question: Is this chip recommended for new designs?
   Answer: This chip is marked as "Not Recommended For New Designs" (NRND). For new projects, you should confirm stock and lifecycle status with suppliers .

10. Question: What peripheral interfaces does it offer?
    Answer: It integrates a rich set of peripherals including UART, SPI, I2C, I2S, ADC, and DAC, allowing flexible connection to external modules .