ESP32-C61-MINI-1 vs ESP32-S2-SOLO-2

ESP32-C61-MINI-1

MINI · ESP32-C61 · New

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ESP32-S2-SOLO-2

SOLO · ESP32-S2 · Active

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Figures here are compiled from Espressif's official datasheets, with the source linked on each page. Mistakes are possible, so if something looks off, please report it.

Which should you choose?

These run different SoCs (ESP32-C61 vs ESP32-S2), so they differ in CPU, wireless and peripherals, not just packaging.

Choose ESP32-C61-MINI-1 if you need

Wi-Fi 6: better battery life and throughput in busy networks
Bluetooth LE
more PSRAM (up to 8 MB)
smaller footprint (13.2×16.6 mm)

Choose ESP32-S2-SOLO-2 if you need

faster CPU (240 MHz, Xtensa LX7)
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 23)

Size, to scale

ESP32-C61-MINI-1: 13.2×16.6 mm
ESP32-S2-SOLO-2: 18×25.5 mm

Spec differences at a glance

CPU: ESP32-C61-MINI-1 RISC-V, 1-core · ESP32-S2-SOLO-2 Xtensa LX7, 1-core
Max clock: ESP32-C61-MINI-1 160 MHz · ESP32-S2-SOLO-2 240 MHz
ROM: ESP32-C61-MINI-1 256 KB · ESP32-S2-SOLO-2 128 KB
Flash options: ESP32-C61-MINI-1 4 / 8 MB · ESP32-S2-SOLO-2 4 / 8 / 16 MB
PSRAM: ESP32-C61-MINI-1 8 MB (quad) · ESP32-S2-SOLO-2 2 MB (quad)
Co-processor: ESP32-C61-MINI-1 none · ESP32-S2-SOLO-2 ULP-RISC-V
Wi-Fi: ESP32-C61-MINI-1 Wi-Fi 6 · ESP32-S2-SOLO-2 Wi-Fi 4
Bluetooth: ESP32-C61-MINI-1 BLE 5.x · ESP32-S2-SOLO-2 —
Usable GPIO: ESP32-C61-MINI-1 23 · ESP32-S2-SOLO-2 36
ADC: ESP32-C61-MINI-1 4× 12-bit · ESP32-S2-SOLO-2 20× 12-bit
USB: ESP32-C61-MINI-1 USB-Serial-JTAG · ESP32-S2-SOLO-2 USB-OTG
UART / SPI / I²C / I²S: ESP32-C61-MINI-1 3 / 1 / 1 / 1 · ESP32-S2-SOLO-2 2 / 2 / 2 / 1
TWAI (CAN): ESP32-C61-MINI-1 No · ESP32-S2-SOLO-2 Yes
SD/MMC: ESP32-C61-MINI-1 Yes · ESP32-S2-SOLO-2 No
Touch: ESP32-C61-MINI-1 0 · ESP32-S2-SOLO-2 14
Deep sleep: ESP32-C61-MINI-1 10 µA · ESP32-S2-SOLO-2 — µA
Dimensions: ESP32-C61-MINI-1 13.2 × 16.6 × 2.4 mm · ESP32-S2-SOLO-2 18 × 25.5 × 3.1 mm
Pin count: ESP32-C61-MINI-1 53 · ESP32-S2-SOLO-2 41
Lifecycle: ESP32-C61-MINI-1 New · ESP32-S2-SOLO-2 Active
Crypto: ESP32-C61-MINI-1 AES, SHA, ECC, ECDSA, RNG · ESP32-S2-SOLO-2 AES, SHA, RSA, HMAC, RNG

Compute & memory

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	ESP32-C61-MINI-1	ESP32-S2-SOLO-2
CPU≠	RISC-V, 1-core	Xtensa LX7, 1-core
Max clock≠	160 MHz	240 MHz
SRAM	320 KB	320 KB
ROM≠	256 KB	128 KB
Flash options≠	4 / 8 MB	4 / 8 / 16 MB
PSRAM≠	8 MB (quad)	2 MB (quad)
Co-processor≠	none	ULP-RISC-V

Wireless

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	ESP32-C61-MINI-1	ESP32-S2-SOLO-2
Wi-Fi≠	Wi-Fi 6	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-C61-MINI-1	ESP32-S2-SOLO-2
Usable GPIO≠	23	36
ADC≠	4× 12-bit	20× 12-bit
USB≠	USB-Serial-JTAG	USB-OTG
UART / SPI / I²C / I²S≠	3 / 1 / 1 / 1	2 / 2 / 2 / 1
TWAI (CAN)≠	No	Yes
SD/MMC≠	Yes	No
Ethernet MAC	No	No
Touch≠	0	14

Power

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	ESP32-C61-MINI-1	ESP32-S2-SOLO-2
Operating voltage	3.0-3.6 V	3.0-3.6 V
Deep sleep≠	10 µA	— µA

Physical

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	ESP32-C61-MINI-1	ESP32-S2-SOLO-2
Dimensions≠	13.2 × 16.6 × 2.4 mm	18 × 25.5 × 3.1 mm
Pin count≠	53	41
Temp range	-40 to 85 °C	-40 to 85 °C
Mounting	SMD castellated	SMD castellated
Lifecycle≠	New	Active

Security

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	ESP32-C61-MINI-1	ESP32-S2-SOLO-2
Secure boot	Yes	Yes
Flash encryption	Yes	Yes
Crypto≠	AES, SHA, ECC, ECDSA, RNG	AES, SHA, RSA, HMAC, RNG
Digital signature	Yes	Yes
TRNG	Yes	Yes