ESP-WROOM-02 vs ESP32-WROOM-32E
ESP-WROOM-02
WROOM · ESP8266 · 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 (ESP8266 vs ESP32), so they differ in CPU, wireless and peripherals — not just packaging.
Choose ESP-WROOM-02 if you need
- smaller footprint (18×20 mm)
Choose ESP32-WROOM-32E if you need
- Bluetooth LE
- 2 CPU cores vs 1 — more headroom for RTOS / parallel work
- faster CPU (240 MHz, Xtensa LX6)
- PSRAM for camera frames, audio buffers and LVGL/large displays
- larger flash option (up to 16 MB) for bigger firmware and OTA
Size, to scale
- ESP-WROOM-02 — 18×20 mm
- ESP32-WROOM-32E — 18×25.5 mm
Spec differences at a glance
- CPU: ESP-WROOM-02 Xtensa L106, 1-core · ESP32-WROOM-32E Xtensa LX6, 2-core
- Max clock: ESP-WROOM-02 160 MHz · ESP32-WROOM-32E 240 MHz
- SRAM: ESP-WROOM-02 — KB · ESP32-WROOM-32E 520 KB
- ROM: ESP-WROOM-02 — KB · ESP32-WROOM-32E 448 KB
- Flash options: ESP-WROOM-02 2 MB · ESP32-WROOM-32E 4 / 8 / 16 MB
- PSRAM: ESP-WROOM-02 None · ESP32-WROOM-32E 2 MB (quad)
- Co-processor: ESP-WROOM-02 none · ESP32-WROOM-32E ULP-FSM
- Bluetooth: ESP-WROOM-02 — · ESP32-WROOM-32E BT Classic + BLE
- Usable GPIO: ESP-WROOM-02 11 · ESP32-WROOM-32E 26
- ADC: ESP-WROOM-02 1× 10-bit · ESP32-WROOM-32E 18× 12-bit
- UART / SPI / I²C / I²S: ESP-WROOM-02 2 / 1 / 1 / 1 · ESP32-WROOM-32E 3 / 2 / 2 / 2
- TWAI (CAN): ESP-WROOM-02 No · ESP32-WROOM-32E Yes
- Ethernet MAC: ESP-WROOM-02 No · ESP32-WROOM-32E Yes
- Touch: ESP-WROOM-02 0 · ESP32-WROOM-32E 10
- Operating voltage: ESP-WROOM-02 2.7-3.6 V · ESP32-WROOM-32E 3.0-3.6 V
- Deep sleep: ESP-WROOM-02 20 µA · ESP32-WROOM-32E 10 µA
- Dimensions: ESP-WROOM-02 18 × 20 × 2.8 mm · ESP32-WROOM-32E 18 × 25.5 × 3.1 mm
- Pin count: ESP-WROOM-02 18 · ESP32-WROOM-32E 38
- Secure boot: ESP-WROOM-02 No · ESP32-WROOM-32E Yes
- Flash encryption: ESP-WROOM-02 No · ESP32-WROOM-32E Yes
- Crypto: ESP-WROOM-02 — · ESP32-WROOM-32E AES, SHA, RSA, RNG
Compute & memory
⚑ flag an error| ESP-WROOM-02 | ESP32-WROOM-32E | |
|---|---|---|
| CPU≠ | Xtensa L106, 1-core | Xtensa LX6, 2-core |
| Max clock≠ | 160 MHz | 240 MHz |
| SRAM≠ | — KB | 520 KB |
| ROM≠ | — KB | 448 KB |
| Flash options≠ | 2 MB | 4 / 8 / 16 MB |
| PSRAM≠ | None | 2 MB (quad) |
| Co-processor≠ | none | ULP-FSM |
Wireless
⚑ flag an error| ESP-WROOM-02 | 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| ESP-WROOM-02 | ESP32-WROOM-32E | |
|---|---|---|
| Usable GPIO≠ | 11 | 26 |
| ADC≠ | 1× 10-bit | 18× 12-bit |
| USB | USB-Serial(external) | USB-Serial(external) |
| UART / SPI / I²C / I²S≠ | 2 / 1 / 1 / 1 | 3 / 2 / 2 / 2 |
| TWAI (CAN)≠ | No | Yes |
| SD/MMC | Yes | Yes |
| Ethernet MAC≠ | No | Yes |
| Touch≠ | 0 | 10 |
Power
⚑ flag an error| ESP-WROOM-02 | ESP32-WROOM-32E | |
|---|---|---|
| Operating voltage≠ | 2.7-3.6 V | 3.0-3.6 V |
| Deep sleep≠ | 20 µA | 10 µA |
Physical
⚑ flag an error| ESP-WROOM-02 | ESP32-WROOM-32E | |
|---|---|---|
| Dimensions≠ | 18 × 20 × 2.8 mm | 18 × 25.5 × 3.1 mm |
| Pin count≠ | 18 | 38 |
| Temp range | -40 to 85 °C | -40 to 85 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle | Active | Active |
Security
⚑ flag an error| ESP-WROOM-02 | ESP32-WROOM-32E | |
|---|---|---|
| Secure boot≠ | No | Yes |
| Flash encryption≠ | No | Yes |
| Crypto≠ | — | AES, SHA, RSA, RNG |
| Digital signature | No | No |
| TRNG | Yes | Yes |