ESP32-S2-MINI-1 vs ESP32-SOLO-1
ESP32-S2-MINI-1
MINI · ESP32-S2 · NRND
Check price on AliExpress →
As an affiliate we may earn from qualifying purchases. Prices and availability are set by AliExpress.
ESP32-SOLO-1
SOLO · ESP32 · Active
Check price on AliExpress →
As an affiliate we may earn from qualifying purchases. Prices and availability are set by AliExpress.
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-S2 vs ESP32), so they differ in CPU, wireless and peripherals, not just packaging.
Choose ESP32-S2-MINI-1 if you need
- PSRAM for camera frames, audio buffers and LVGL/large displays
- native USB-OTG: act as a USB device/host without a USB-UART chip
- more usable GPIO (37 vs 32)
- smaller footprint (15.4×20 mm)
Choose ESP32-SOLO-1 if you need
- Bluetooth LE
- Ethernet MAC for wired networking (add an external PHY)
- active lifecycle (the other is NRND)
Size, to scale
- ESP32-S2-MINI-1: 15.4×20 mm
- ESP32-SOLO-1: 18×25.5 mm
Spec differences at a glance
- CPU: ESP32-S2-MINI-1 Xtensa LX7, 1-core · ESP32-SOLO-1 Xtensa LX6, 1-core
- SRAM: ESP32-S2-MINI-1 320 KB · ESP32-SOLO-1 520 KB
- ROM: ESP32-S2-MINI-1 128 KB · ESP32-SOLO-1 448 KB
- PSRAM: ESP32-S2-MINI-1 2 MB (quad) · ESP32-SOLO-1 None
- Co-processor: ESP32-S2-MINI-1 ULP-RISC-V · ESP32-SOLO-1 ULP-FSM
- Bluetooth: ESP32-S2-MINI-1 — · ESP32-SOLO-1 BT Classic + BLE
- Usable GPIO: ESP32-S2-MINI-1 37 · ESP32-SOLO-1 32
- ADC: ESP32-S2-MINI-1 20× 12-bit · ESP32-SOLO-1 18× 12-bit
- USB: ESP32-S2-MINI-1 USB-OTG · ESP32-SOLO-1 USB-Serial(external)
- UART / SPI / I²C / I²S: ESP32-S2-MINI-1 2 / 2 / 2 / 1 · ESP32-SOLO-1 3 / 2 / 2 / 2
- SD/MMC: ESP32-S2-MINI-1 No · ESP32-SOLO-1 Yes
- Ethernet MAC: ESP32-S2-MINI-1 No · ESP32-SOLO-1 Yes
- Touch: ESP32-S2-MINI-1 14 · ESP32-SOLO-1 10
- Deep sleep: ESP32-S2-MINI-1 — µA · ESP32-SOLO-1 10 µA
- Dimensions: ESP32-S2-MINI-1 15.4 × 20 × 2.4 mm · ESP32-SOLO-1 18 × 25.5 × 3.1 mm
- Pin count: ESP32-S2-MINI-1 41 · ESP32-SOLO-1 38
- Lifecycle: ESP32-S2-MINI-1 NRND · ESP32-SOLO-1 Active
- Crypto: ESP32-S2-MINI-1 AES, SHA, RSA, HMAC, RNG · ESP32-SOLO-1 AES, SHA, RSA, RNG
- Digital signature: ESP32-S2-MINI-1 Yes · ESP32-SOLO-1 No
Compute & memory
⚑ flag an error| ESP32-S2-MINI-1 | ESP32-SOLO-1 | |
|---|---|---|
| CPU≠ | Xtensa LX7, 1-core | Xtensa LX6, 1-core |
| Max clock | 240 MHz | 240 MHz |
| SRAM≠ | 320 KB | 520 KB |
| ROM≠ | 128 KB | 448 KB |
| Flash options | 4 MB | 4 MB |
| PSRAM≠ | 2 MB (quad) | None |
| Co-processor≠ | ULP-RISC-V | ULP-FSM |
Wireless
⚑ flag an error| ESP32-S2-MINI-1 | ESP32-SOLO-1 | |
|---|---|---|
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| Wi-Fi bands | 2.4GHz | 2.4GHz |
| Bluetooth≠ | — | BT Classic + BLE |
| 802.15.4 (Thread/Zigbee) | No | No |
| Antenna | PCB | PCB |
Peripherals & I/O
⚑ flag an error| ESP32-S2-MINI-1 | ESP32-SOLO-1 | |
|---|---|---|
| Usable GPIO≠ | 37 | 32 |
| ADC≠ | 20× 12-bit | 18× 12-bit |
| USB≠ | USB-OTG | USB-Serial(external) |
| UART / SPI / I²C / I²S≠ | 2 / 2 / 2 / 1 | 3 / 2 / 2 / 2 |
| TWAI (CAN) | Yes | Yes |
| SD/MMC≠ | No | Yes |
| Ethernet MAC≠ | No | Yes |
| Touch≠ | 14 | 10 |
Power
⚑ flag an error| ESP32-S2-MINI-1 | ESP32-SOLO-1 | |
|---|---|---|
| Operating voltage | 3.0-3.6 V | 3.0-3.6 V |
| Deep sleep≠ | — µA | 10 µA |
Physical
⚑ flag an error| ESP32-S2-MINI-1 | ESP32-SOLO-1 | |
|---|---|---|
| Dimensions≠ | 15.4 × 20 × 2.4 mm | 18 × 25.5 × 3.1 mm |
| Pin count≠ | 41 | 38 |
| 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-SOLO-1 | |
|---|---|---|
| Secure boot | Yes | Yes |
| Flash encryption | Yes | Yes |
| Crypto≠ | AES, SHA, RSA, HMAC, RNG | AES, SHA, RSA, RNG |
| Digital signature≠ | Yes | No |
| TRNG | Yes | Yes |