ESP32-S2-SOLO-2 vs ESP32-S2-WROOM
ESP32-S2-SOLO-2
SOLO · ESP32-S2 · Active
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ESP32-S2-WROOM
WROOM · 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?
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-SOLO-2 if you need
- PSRAM for camera frames, audio buffers and LVGL/large displays
- larger flash option (up to 16 MB) for bigger firmware and OTA
- smaller footprint (18×25.5 mm)
Choose ESP32-S2-WROOM if you need
- more usable GPIO (37 vs 36)
Size, to scale
- ESP32-S2-SOLO-2: 18×25.5 mm
- ESP32-S2-WROOM: 18×31 mm
Spec differences at a glance
- Flash options: ESP32-S2-SOLO-2 4 / 8 / 16 MB · ESP32-S2-WROOM 4 MB
- PSRAM: ESP32-S2-SOLO-2 2 MB (quad) · ESP32-S2-WROOM None
- Usable GPIO: ESP32-S2-SOLO-2 36 · ESP32-S2-WROOM 37
- Dimensions: ESP32-S2-SOLO-2 18 × 25.5 × 3.1 mm · ESP32-S2-WROOM 18 × 31 × 3.3 mm
- Pin count: ESP32-S2-SOLO-2 41 · ESP32-S2-WROOM 42
Compute & memory
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-S2-WROOM | |
|---|---|---|
| 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 / 8 / 16 MB | 4 MB |
| PSRAM≠ | 2 MB (quad) | None |
| Co-processor | ULP-RISC-V | ULP-RISC-V |
Wireless
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-S2-WROOM | |
|---|---|---|
| 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-SOLO-2 | ESP32-S2-WROOM | |
|---|---|---|
| Usable GPIO≠ | 36 | 37 |
| 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-SOLO-2 | ESP32-S2-WROOM | |
|---|---|---|
| Operating voltage | 3.0-3.6 V | 3.0-3.6 V |
| Deep sleep | — µA | — µA |
Physical
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-S2-WROOM | |
|---|---|---|
| Dimensions≠ | 18 × 25.5 × 3.1 mm | 18 × 31 × 3.3 mm |
| Pin count≠ | 41 | 42 |
| Temp range | -40 to 85 °C | -40 to 85 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle | Active | Active |
Security
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-S2-WROOM | |
|---|---|---|
| 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 |