ESP32-S2-SOLO-2 vs ESP8684-WROOM-01C

ESP32-S2-SOLO-2

SOLO · ESP32-S2 · Active

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ESP8684-WROOM-01C

WROOM · ESP32-C2 · Active

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Every figure here is checked against Espressif’s official datasheets. We’ve taken every care to keep it accurate — but datasheets are dense and mistakes happen, so if something looks off, please report it.

Which should you choose?

These run different SoCs (ESP32-S2 vs ESP32-C2), so they differ in CPU, wireless and peripherals — not just packaging.

Choose ESP32-S2-SOLO-2 if you need

faster CPU (240 MHz, Xtensa LX7)
PSRAM for camera frames, audio buffers and LVGL/large displays
larger flash option (up to 16 MB) for bigger firmware and OTA
native USB-OTG — act as a USB device/host without a USB-UART chip
more usable GPIO (36 vs 14)

Choose ESP8684-WROOM-01C if you need

Bluetooth LE
smaller footprint (16×24 mm)

Size, to scale

ESP32-S2-SOLO-2 — 18×25.5 mm
ESP8684-WROOM-01C — 16×24 mm

Spec differences at a glance

CPU: ESP32-S2-SOLO-2 Xtensa LX7, 1-core · ESP8684-WROOM-01C RISC-V, 1-core
Max clock: ESP32-S2-SOLO-2 240 MHz · ESP8684-WROOM-01C 120 MHz
SRAM: ESP32-S2-SOLO-2 320 KB · ESP8684-WROOM-01C 272 KB
ROM: ESP32-S2-SOLO-2 128 KB · ESP8684-WROOM-01C 576 KB
Flash options: ESP32-S2-SOLO-2 4 / 8 / 16 MB · ESP8684-WROOM-01C 2 / 4 MB
PSRAM: ESP32-S2-SOLO-2 2 MB (quad) · ESP8684-WROOM-01C None
Co-processor: ESP32-S2-SOLO-2 ULP-RISC-V · ESP8684-WROOM-01C none
Bluetooth: ESP32-S2-SOLO-2 — · ESP8684-WROOM-01C BLE 5.x
Usable GPIO: ESP32-S2-SOLO-2 36 · ESP8684-WROOM-01C 14
ADC: ESP32-S2-SOLO-2 20× 12-bit · ESP8684-WROOM-01C 5× 12-bit
USB: ESP32-S2-SOLO-2 USB-OTG · ESP8684-WROOM-01C USB-Serial(external)
UART / SPI / I²C / I²S: ESP32-S2-SOLO-2 2 / 2 / 2 / 1 · ESP8684-WROOM-01C 2 / 1 / 1 / 0
TWAI (CAN): ESP32-S2-SOLO-2 Yes · ESP8684-WROOM-01C No
Touch: ESP32-S2-SOLO-2 14 · ESP8684-WROOM-01C 0
Deep sleep: ESP32-S2-SOLO-2 — µA · ESP8684-WROOM-01C 5 µA
Dimensions: ESP32-S2-SOLO-2 18 × 25.5 × 3.1 mm · ESP8684-WROOM-01C 16 × 24 × 3.1 mm
Pin count: ESP32-S2-SOLO-2 41 · ESP8684-WROOM-01C 23
Temp range: ESP32-S2-SOLO-2 -40 to 85 °C · ESP8684-WROOM-01C -40 to 105 °C
Crypto: ESP32-S2-SOLO-2 AES, SHA, RSA, HMAC, RNG · ESP8684-WROOM-01C ECC, SHA, RNG
Digital signature: ESP32-S2-SOLO-2 Yes · ESP8684-WROOM-01C No

Compute & memory

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	ESP32-S2-SOLO-2	ESP8684-WROOM-01C
CPU≠	Xtensa LX7, 1-core	RISC-V, 1-core
Max clock≠	240 MHz	120 MHz
SRAM≠	320 KB	272 KB
ROM≠	128 KB	576 KB
Flash options≠	4 / 8 / 16 MB	2 / 4 MB
PSRAM≠	2 MB (quad)	None
Co-processor≠	ULP-RISC-V	none

Wireless

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	ESP32-S2-SOLO-2	ESP8684-WROOM-01C
Wi-Fi	Wi-Fi 4	Wi-Fi 4
Wi-Fi bands	2.4GHz	2.4GHz
Bluetooth≠	—	BLE 5.x
802.15.4 (Thread/Zigbee)	No	No
Antenna	PCB	PCB

Peripherals & I/O

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	ESP32-S2-SOLO-2	ESP8684-WROOM-01C
Usable GPIO≠	36	14
ADC≠	20× 12-bit	5× 12-bit
USB≠	USB-OTG	USB-Serial(external)
UART / SPI / I²C / I²S≠	2 / 2 / 2 / 1	2 / 1 / 1 / 0
TWAI (CAN)≠	Yes	No
SD/MMC	No	No
Ethernet MAC	No	No
Touch≠	14	0

Power

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	ESP32-S2-SOLO-2	ESP8684-WROOM-01C
Operating voltage	3.0-3.6 V	3.0-3.6 V
Deep sleep≠	— µA	5 µA

Physical

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	ESP32-S2-SOLO-2	ESP8684-WROOM-01C
Dimensions≠	18 × 25.5 × 3.1 mm	16 × 24 × 3.1 mm
Pin count≠	41	23
Temp range≠	-40 to 85 °C	-40 to 105 °C
Mounting	SMD castellated	SMD castellated
Lifecycle	Active	Active

Security

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	ESP32-S2-SOLO-2	ESP8684-WROOM-01C
Secure boot	Yes	Yes
Flash encryption	Yes	Yes
Crypto≠	AES, SHA, RSA, HMAC, RNG	ECC, SHA, RNG
Digital signature≠	Yes	No
TRNG	Yes	Yes