ESP-WROOM-02 vs ESP8684-WROOM-03
ESP-WROOM-02
WROOM · ESP8266 · Active
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ESP8684-WROOM-03
WROOM · ESP32-C2 · 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 (ESP8266 vs ESP32-C2), so they differ in CPU, wireless and peripherals, not just packaging.
Choose ESP-WROOM-02 if you need
- faster CPU (160 MHz, Xtensa L106)
- more usable GPIO (11 vs 8)
Choose ESP8684-WROOM-03 if you need
- Bluetooth LE
- larger flash option (up to 4 MB) for bigger firmware and OTA
- smaller footprint (15×17.3 mm)
Size, to scale
- ESP-WROOM-02: 18×20 mm
- ESP8684-WROOM-03: 15×17.3 mm
Spec differences at a glance
- CPU: ESP-WROOM-02 Xtensa L106, 1-core · ESP8684-WROOM-03 RISC-V, 1-core
- Max clock: ESP-WROOM-02 160 MHz · ESP8684-WROOM-03 120 MHz
- SRAM: ESP-WROOM-02 — KB · ESP8684-WROOM-03 272 KB
- ROM: ESP-WROOM-02 — KB · ESP8684-WROOM-03 576 KB
- Flash options: ESP-WROOM-02 2 MB · ESP8684-WROOM-03 2 / 4 MB
- Bluetooth: ESP-WROOM-02 — · ESP8684-WROOM-03 BLE 5.x
- Usable GPIO: ESP-WROOM-02 11 · ESP8684-WROOM-03 8
- ADC: ESP-WROOM-02 1× 10-bit · ESP8684-WROOM-03 5× 12-bit
- UART / SPI / I²C / I²S: ESP-WROOM-02 2 / 1 / 1 / 1 · ESP8684-WROOM-03 2 / 1 / 1 / 0
- SD/MMC: ESP-WROOM-02 Yes · ESP8684-WROOM-03 No
- Operating voltage: ESP-WROOM-02 2.7-3.6 V · ESP8684-WROOM-03 3.0-3.6 V
- Deep sleep: ESP-WROOM-02 20 µA · ESP8684-WROOM-03 5 µA
- Dimensions: ESP-WROOM-02 18 × 20 × 2.8 mm · ESP8684-WROOM-03 15 × 17.3 × 2.8 mm
- Pin count: ESP-WROOM-02 18 · ESP8684-WROOM-03 11
- Temp range: ESP-WROOM-02 -40 to 85 °C · ESP8684-WROOM-03 -40 to 105 °C
- Secure boot: ESP-WROOM-02 No · ESP8684-WROOM-03 Yes
- Flash encryption: ESP-WROOM-02 No · ESP8684-WROOM-03 Yes
- Crypto: ESP-WROOM-02 — · ESP8684-WROOM-03 ECC, SHA, RNG
Compute & memory
⚑ flag an error| ESP-WROOM-02 | ESP8684-WROOM-03 | |
|---|---|---|
| CPU≠ | Xtensa L106, 1-core | RISC-V, 1-core |
| Max clock≠ | 160 MHz | 120 MHz |
| SRAM≠ | — KB | 272 KB |
| ROM≠ | — KB | 576 KB |
| Flash options≠ | 2 MB | 2 / 4 MB |
| PSRAM | None | None |
| Co-processor | none | none |
Wireless
⚑ flag an error| ESP-WROOM-02 | ESP8684-WROOM-03 | |
|---|---|---|
| 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| ESP-WROOM-02 | ESP8684-WROOM-03 | |
|---|---|---|
| Usable GPIO≠ | 11 | 8 |
| ADC≠ | 1× 10-bit | 5× 12-bit |
| USB | USB-Serial(external) | USB-Serial(external) |
| UART / SPI / I²C / I²S≠ | 2 / 1 / 1 / 1 | 2 / 1 / 1 / 0 |
| TWAI (CAN) | No | No |
| SD/MMC≠ | Yes | No |
| Ethernet MAC | No | No |
| Touch | 0 | 0 |
Power
⚑ flag an error| ESP-WROOM-02 | ESP8684-WROOM-03 | |
|---|---|---|
| Operating voltage≠ | 2.7-3.6 V | 3.0-3.6 V |
| Deep sleep≠ | 20 µA | 5 µA |
Physical
⚑ flag an error| ESP-WROOM-02 | ESP8684-WROOM-03 | |
|---|---|---|
| Dimensions≠ | 18 × 20 × 2.8 mm | 15 × 17.3 × 2.8 mm |
| Pin count≠ | 18 | 11 |
| Temp range≠ | -40 to 85 °C | -40 to 105 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle | Active | Active |
Security
⚑ flag an error| ESP-WROOM-02 | ESP8684-WROOM-03 | |
|---|---|---|
| Secure boot≠ | No | Yes |
| Flash encryption≠ | No | Yes |
| Crypto≠ | — | ECC, SHA, RNG |
| Digital signature | No | No |
| TRNG | Yes | Yes |