ESP32-S2-SOLO-2 vs ESP32-S3-WROOM-2
ESP32-S2-SOLO-2
SOLO · ESP32-S2 · Active
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ESP32-S3-WROOM-2
WROOM · ESP32-S3 · 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?
These run different SoCs (ESP32-S2 vs ESP32-S3), so they differ in CPU, wireless and peripherals — not just packaging.
Choose ESP32-S2-SOLO-2 if you need
- more usable GPIO (36 vs 33)
Choose ESP32-S3-WROOM-2 if you need
- Bluetooth LE
- 2 CPU cores vs 1 — more headroom for RTOS / parallel work
- vector / AI acceleration for on-device ML and DSP
- more PSRAM (up to 16 MB)
- larger flash option (up to 32 MB) for bigger firmware and OTA
Size, to scale
Same footprint — both are 18×25.5 mm.
Spec differences at a glance
- CPU: ESP32-S2-SOLO-2 Xtensa LX7, 1-core · ESP32-S3-WROOM-2 Xtensa LX7, 2-core
- SRAM: ESP32-S2-SOLO-2 320 KB · ESP32-S3-WROOM-2 512 KB
- ROM: ESP32-S2-SOLO-2 128 KB · ESP32-S3-WROOM-2 384 KB
- Flash options: ESP32-S2-SOLO-2 4 / 8 / 16 MB · ESP32-S3-WROOM-2 16 / 32 MB
- PSRAM: ESP32-S2-SOLO-2 2 MB (quad) · ESP32-S3-WROOM-2 8 / 16 MB (octal)
- Bluetooth: ESP32-S2-SOLO-2 — · ESP32-S3-WROOM-2 BLE 5.x
- Usable GPIO: ESP32-S2-SOLO-2 36 · ESP32-S3-WROOM-2 33
- UART / SPI / I²C / I²S: ESP32-S2-SOLO-2 2 / 2 / 2 / 1 · ESP32-S3-WROOM-2 3 / 2 / 2 / 2
- SD/MMC: ESP32-S2-SOLO-2 No · ESP32-S3-WROOM-2 Yes
- Deep sleep: ESP32-S2-SOLO-2 — µA · ESP32-S3-WROOM-2 7 µA
- Temp range: ESP32-S2-SOLO-2 -40 to 85 °C · ESP32-S3-WROOM-2 -40 to 65 °C
Compute & memory
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-S3-WROOM-2 | |
|---|---|---|
| CPU≠ | Xtensa LX7, 1-core | Xtensa LX7, 2-core |
| Max clock | 240 MHz | 240 MHz |
| SRAM≠ | 320 KB | 512 KB |
| ROM≠ | 128 KB | 384 KB |
| Flash options≠ | 4 / 8 / 16 MB | 16 / 32 MB |
| PSRAM≠ | 2 MB (quad) | 8 / 16 MB (octal) |
| Co-processor | ULP-RISC-V | ULP-RISC-V |
Wireless
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-S3-WROOM-2 | |
|---|---|---|
| Wi-Fi | Wi-Fi 4 | 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
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-S3-WROOM-2 | |
|---|---|---|
| Usable GPIO≠ | 36 | 33 |
| ADC | 20× 12-bit | 20× 12-bit |
| USB | USB-OTG | USB-OTG |
| UART / SPI / I²C / I²S≠ | 2 / 2 / 2 / 1 | 3 / 2 / 2 / 2 |
| TWAI (CAN) | Yes | Yes |
| SD/MMC≠ | No | Yes |
| Ethernet MAC | No | No |
| Touch | 14 | 14 |
Power
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-S3-WROOM-2 | |
|---|---|---|
| Operating voltage | 3.0-3.6 V | 3.0-3.6 V |
| Deep sleep≠ | — µA | 7 µA |
Physical
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-S3-WROOM-2 | |
|---|---|---|
| Dimensions | 18 × 25.5 × 3.1 mm | 18 × 25.5 × 3.1 mm |
| Pin count | 41 | 41 |
| Temp range≠ | -40 to 85 °C | -40 to 65 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle | Active | Active |
Security
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-S3-WROOM-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 |