ESP32-S2-MINI-1 vs ESP32-S2-SOLO-2
ESP32-S2-MINI-1
MINI · ESP32-S2 · NRND
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ESP32-S2-SOLO-2
SOLO · ESP32-S2 · 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?
Both are built on the same ESP32-S2 SoC, so CPU and radios are identical — the choice is about memory, form factor and antenna.
Choose ESP32-S2-MINI-1 if you need
- more usable GPIO (37 vs 36)
- smaller footprint (15.4×20 mm)
Choose ESP32-S2-SOLO-2 if you need
- larger flash option (up to 16 MB) for bigger firmware and OTA
- active lifecycle (the other is NRND)
Size, to scale
- ESP32-S2-MINI-1 — 15.4×20 mm
- ESP32-S2-SOLO-2 — 18×25.5 mm
Spec differences at a glance
- Flash options: ESP32-S2-MINI-1 4 MB · ESP32-S2-SOLO-2 4 / 8 / 16 MB
- Usable GPIO: ESP32-S2-MINI-1 37 · ESP32-S2-SOLO-2 36
- Dimensions: ESP32-S2-MINI-1 15.4 × 20 × 2.4 mm · ESP32-S2-SOLO-2 18 × 25.5 × 3.1 mm
- Lifecycle: ESP32-S2-MINI-1 NRND · ESP32-S2-SOLO-2 Active
Compute & memory
⚑ flag an error| ESP32-S2-MINI-1 | ESP32-S2-SOLO-2 | |
|---|---|---|
| CPU | Xtensa LX7, 1-core | Xtensa LX7, 1-core |
| Max clock | 240 MHz | 240 MHz |
| SRAM | 320 KB | 320 KB |
| ROM | 128 KB | 128 KB |
| Flash options≠ | 4 MB | 4 / 8 / 16 MB |
| PSRAM | 2 MB (quad) | 2 MB (quad) |
| Co-processor | ULP-RISC-V | ULP-RISC-V |
Wireless
⚑ flag an error| ESP32-S2-MINI-1 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| Wi-Fi bands | 2.4GHz | 2.4GHz |
| Bluetooth | — | — |
| 802.15.4 (Thread/Zigbee) | No | No |
| Antenna | PCB | PCB |
Peripherals & I/O
⚑ flag an error| ESP32-S2-MINI-1 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Usable GPIO≠ | 37 | 36 |
| ADC | 20× 12-bit | 20× 12-bit |
| USB | USB-OTG | USB-OTG |
| UART / SPI / I²C / I²S | 2 / 2 / 2 / 1 | 2 / 2 / 2 / 1 |
| TWAI (CAN) | Yes | Yes |
| SD/MMC | No | No |
| Ethernet MAC | No | No |
| Touch | 14 | 14 |
Power
⚑ flag an error| ESP32-S2-MINI-1 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Operating voltage | 3.0-3.6 V | 3.0-3.6 V |
| Deep sleep | — µA | — µA |
Physical
⚑ flag an error| ESP32-S2-MINI-1 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Dimensions≠ | 15.4 × 20 × 2.4 mm | 18 × 25.5 × 3.1 mm |
| Pin count | 41 | 41 |
| Temp range | -40 to 85 °C | -40 to 85 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle≠ | NRND | Active |
Security
⚑ flag an error| ESP32-S2-MINI-1 | ESP32-S2-SOLO-2 | |
|---|---|---|
| Secure boot | Yes | Yes |
| Flash encryption | Yes | Yes |
| Crypto | AES, SHA, RSA, HMAC, RNG | AES, SHA, RSA, HMAC, RNG |
| Digital signature | Yes | Yes |
| TRNG | Yes | Yes |