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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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), 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 |