ESP32-S2-SOLO-2 vs ESP32-S3-WROOM-1
ESP32-S2-SOLO-2
SOLO · ESP32-S2 · Active
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ESP32-S3-WROOM-1
WROOM · ESP32-S3 · 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-S2 vs ESP32-S3), so they differ in CPU, wireless and peripherals, not just packaging.
Choose ESP32-S2-SOLO-2 if you need
no standout advantage over ESP32-S3-WROOM-1; it trades on the points opposite.
Choose ESP32-S3-WROOM-1 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)
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-1 Xtensa LX7, 2-core
- SRAM: ESP32-S2-SOLO-2 320 KB · ESP32-S3-WROOM-1 512 KB
- ROM: ESP32-S2-SOLO-2 128 KB · ESP32-S3-WROOM-1 384 KB
- PSRAM: ESP32-S2-SOLO-2 2 MB (quad) · ESP32-S3-WROOM-1 2 / 8 / 16 MB
- Bluetooth: ESP32-S2-SOLO-2 — · ESP32-S3-WROOM-1 BLE 5.x
- UART / SPI / I²C / I²S: ESP32-S2-SOLO-2 2 / 2 / 2 / 1 · ESP32-S3-WROOM-1 3 / 2 / 2 / 2
- SD/MMC: ESP32-S2-SOLO-2 No · ESP32-S3-WROOM-1 Yes
- Deep sleep: ESP32-S2-SOLO-2 — µA · ESP32-S3-WROOM-1 7 µA
Compute & memory
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-S3-WROOM-1 | |
|---|---|---|
| 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 | 4 / 8 / 16 MB |
| PSRAM≠ | 2 MB (quad) | 2 / 8 / 16 MB |
| Co-processor | ULP-RISC-V | ULP-RISC-V |
Wireless
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-S3-WROOM-1 | |
|---|---|---|
| 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-1 | |
|---|---|---|
| Usable GPIO | 36 | 36 |
| 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-1 | |
|---|---|---|
| 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-1 | |
|---|---|---|
| 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 85 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle | Active | Active |
Security
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-S3-WROOM-1 | |
|---|---|---|
| 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 |