ESP32-H2-MINI-1 vs ESP32-S2-SOLO-2

ESP32-H2-MINI-1

MINI · ESP32-H2 · Active

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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-H2 vs ESP32-S2), so they differ in CPU, wireless and peripherals, not just packaging.

Choose ESP32-H2-MINI-1 if you need

802.15.4 radio for Thread, Zigbee and Matter-over-Thread mesh
Bluetooth LE
smaller footprint (13.2×16.6 mm)

Choose ESP32-S2-SOLO-2 if you need

newer Wi-Fi (Wi-Fi 4)
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

Size, to scale

ESP32-H2-MINI-1: 13.2×16.6 mm
ESP32-S2-SOLO-2: 18×25.5 mm

Spec differences at a glance

CPU: ESP32-H2-MINI-1 RISC-V, 1-core · ESP32-S2-SOLO-2 Xtensa LX7, 1-core
Max clock: ESP32-H2-MINI-1 96 MHz · ESP32-S2-SOLO-2 240 MHz
Flash options: ESP32-H2-MINI-1 2 / 4 MB · ESP32-S2-SOLO-2 4 / 8 / 16 MB
PSRAM: ESP32-H2-MINI-1 None · ESP32-S2-SOLO-2 2 MB (quad)
Co-processor: ESP32-H2-MINI-1 none · ESP32-S2-SOLO-2 ULP-RISC-V
Wi-Fi: ESP32-H2-MINI-1 — · ESP32-S2-SOLO-2 Wi-Fi 4
Wi-Fi bands: ESP32-H2-MINI-1 — · ESP32-S2-SOLO-2 2.4GHz
Bluetooth: ESP32-H2-MINI-1 BLE 5.x · ESP32-S2-SOLO-2 —
802.15.4 (Thread/Zigbee): ESP32-H2-MINI-1 Yes · ESP32-S2-SOLO-2 No
Usable GPIO: ESP32-H2-MINI-1 19 · ESP32-S2-SOLO-2 36
ADC: ESP32-H2-MINI-1 5× 12-bit · ESP32-S2-SOLO-2 20× 12-bit
USB: ESP32-H2-MINI-1 USB-Serial-JTAG · ESP32-S2-SOLO-2 USB-OTG
UART / SPI / I²C / I²S: ESP32-H2-MINI-1 2 / 1 / 2 / 1 · ESP32-S2-SOLO-2 2 / 2 / 2 / 1
Touch: ESP32-H2-MINI-1 0 · ESP32-S2-SOLO-2 14
Deep sleep: ESP32-H2-MINI-1 7 µA · ESP32-S2-SOLO-2 — µA
Dimensions: ESP32-H2-MINI-1 13.2 × 16.6 × 2.4 mm · ESP32-S2-SOLO-2 18 × 25.5 × 3.1 mm
Pin count: ESP32-H2-MINI-1 53 · ESP32-S2-SOLO-2 41
Temp range: ESP32-H2-MINI-1 -40 to 105 °C · ESP32-S2-SOLO-2 -40 to 85 °C
Crypto: ESP32-H2-MINI-1 AES, SHA, RSA, HMAC, ECC, ECDSA, RNG · ESP32-S2-SOLO-2 AES, SHA, RSA, HMAC, RNG

Compute & memory

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	ESP32-H2-MINI-1	ESP32-S2-SOLO-2
CPU≠	RISC-V, 1-core	Xtensa LX7, 1-core
Max clock≠	96 MHz	240 MHz
SRAM	320 KB	320 KB
ROM	128 KB	128 KB
Flash options≠	2 / 4 MB	4 / 8 / 16 MB
PSRAM≠	None	2 MB (quad)
Co-processor≠	none	ULP-RISC-V

Wireless

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	ESP32-H2-MINI-1	ESP32-S2-SOLO-2
Wi-Fi≠	—	Wi-Fi 4
Wi-Fi bands≠	—	2.4GHz
Bluetooth≠	BLE 5.x	—
802.15.4 (Thread/Zigbee)≠	Yes	No
Antenna	PCB	PCB

Peripherals & I/O

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	ESP32-H2-MINI-1	ESP32-S2-SOLO-2
Usable GPIO≠	19	36
ADC≠	5× 12-bit	20× 12-bit
USB≠	USB-Serial-JTAG	USB-OTG
UART / SPI / I²C / I²S≠	2 / 1 / 2 / 1	2 / 2 / 2 / 1
TWAI (CAN)	Yes	Yes
SD/MMC	No	No
Ethernet MAC	No	No
Touch≠	0	14

Power

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	ESP32-H2-MINI-1	ESP32-S2-SOLO-2
Operating voltage	3.0-3.6 V	3.0-3.6 V
Deep sleep≠	7 µA	— µA

Physical

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	ESP32-H2-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 105 °C	-40 to 85 °C
Mounting	SMD castellated	SMD castellated
Lifecycle	Active	Active

Security

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	ESP32-H2-MINI-1	ESP32-S2-SOLO-2
Secure boot	Yes	Yes
Flash encryption	Yes	Yes
Crypto≠	AES, SHA, RSA, HMAC, ECC, ECDSA, RNG	AES, SHA, RSA, HMAC, RNG
Digital signature	Yes	Yes
TRNG	Yes	Yes