ESP32-S2-SOLO-2 vs ESP32-WROOM-32E
ESP32-S2-SOLO-2
SOLO · ESP32-S2 · Active
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ESP32-WROOM-32E
WROOM · ESP32 · 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), so they differ in CPU, wireless and peripherals, not just packaging.
Choose ESP32-S2-SOLO-2 if you need
- native USB-OTG: act as a USB device/host without a USB-UART chip
- more usable GPIO (36 vs 26)
Choose ESP32-WROOM-32E if you need
- Bluetooth LE
- 2 CPU cores vs 1: more headroom for RTOS / parallel work
- Ethernet MAC for wired networking (add an external PHY)
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-WROOM-32E Xtensa LX6, 2-core
- SRAM: ESP32-S2-SOLO-2 320 KB · ESP32-WROOM-32E 520 KB
- ROM: ESP32-S2-SOLO-2 128 KB · ESP32-WROOM-32E 448 KB
- Co-processor: ESP32-S2-SOLO-2 ULP-RISC-V · ESP32-WROOM-32E ULP-FSM
- Bluetooth: ESP32-S2-SOLO-2 — · ESP32-WROOM-32E BT Classic + BLE
- Usable GPIO: ESP32-S2-SOLO-2 36 · ESP32-WROOM-32E 26
- ADC: ESP32-S2-SOLO-2 20× 12-bit · ESP32-WROOM-32E 18× 12-bit
- USB: ESP32-S2-SOLO-2 USB-OTG · ESP32-WROOM-32E USB-Serial(external)
- UART / SPI / I²C / I²S: ESP32-S2-SOLO-2 2 / 2 / 2 / 1 · ESP32-WROOM-32E 3 / 2 / 2 / 2
- SD/MMC: ESP32-S2-SOLO-2 No · ESP32-WROOM-32E Yes
- Ethernet MAC: ESP32-S2-SOLO-2 No · ESP32-WROOM-32E Yes
- Touch: ESP32-S2-SOLO-2 14 · ESP32-WROOM-32E 10
- Deep sleep: ESP32-S2-SOLO-2 — µA · ESP32-WROOM-32E 10 µA
- Pin count: ESP32-S2-SOLO-2 41 · ESP32-WROOM-32E 38
- Crypto: ESP32-S2-SOLO-2 AES, SHA, RSA, HMAC, RNG · ESP32-WROOM-32E AES, SHA, RSA, RNG
- Digital signature: ESP32-S2-SOLO-2 Yes · ESP32-WROOM-32E No
Compute & memory
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-WROOM-32E | |
|---|---|---|
| CPU≠ | Xtensa LX7, 1-core | Xtensa LX6, 2-core |
| Max clock | 240 MHz | 240 MHz |
| SRAM≠ | 320 KB | 520 KB |
| ROM≠ | 128 KB | 448 KB |
| Flash options | 4 / 8 / 16 MB | 4 / 8 / 16 MB |
| PSRAM | 2 MB (quad) | 2 MB (quad) |
| Co-processor≠ | ULP-RISC-V | ULP-FSM |
Wireless
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-WROOM-32E | |
|---|---|---|
| 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-SOLO-2 | ESP32-WROOM-32E | |
|---|---|---|
| Usable GPIO≠ | 36 | 26 |
| 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-SOLO-2 | ESP32-WROOM-32E | |
|---|---|---|
| Operating voltage | 3.0-3.6 V | 3.0-3.6 V |
| Deep sleep≠ | — µA | 10 µA |
Physical
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-WROOM-32E | |
|---|---|---|
| Dimensions | 18 × 25.5 × 3.1 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 | Active | Active |
Security
⚑ flag an error| ESP32-S2-SOLO-2 | ESP32-WROOM-32E | |
|---|---|---|
| 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 |