ESP32-C3-WROOM-02 vs ESP8684-WROOM-01C
ESP32-C3-WROOM-02
WROOM · ESP32-C3 · Active
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ESP8684-WROOM-01C
WROOM · ESP32-C2 · 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-C3 vs ESP32-C2), so they differ in CPU, wireless and peripherals — not just packaging.
Choose ESP32-C3-WROOM-02 if you need
- higher clock (160 MHz)
- larger flash option (up to 16 MB) for bigger firmware and OTA
- more usable GPIO (15 vs 14)
Choose ESP8684-WROOM-01C if you need
no standout advantage over ESP32-C3-WROOM-02 — it trades on the points opposite.
Size, to scale
- ESP32-C3-WROOM-02 — 18×20 mm
- ESP8684-WROOM-01C — 16×24 mm
Spec differences at a glance
- Max clock: ESP32-C3-WROOM-02 160 MHz · ESP8684-WROOM-01C 120 MHz
- SRAM: ESP32-C3-WROOM-02 400 KB · ESP8684-WROOM-01C 272 KB
- ROM: ESP32-C3-WROOM-02 384 KB · ESP8684-WROOM-01C 576 KB
- Flash options: ESP32-C3-WROOM-02 4 / 8 / 16 MB · ESP8684-WROOM-01C 2 / 4 MB
- Usable GPIO: ESP32-C3-WROOM-02 15 · ESP8684-WROOM-01C 14
- ADC: ESP32-C3-WROOM-02 6× 12-bit · ESP8684-WROOM-01C 5× 12-bit
- USB: ESP32-C3-WROOM-02 USB-Serial-JTAG · ESP8684-WROOM-01C USB-Serial(external)
- UART / SPI / I²C / I²S: ESP32-C3-WROOM-02 2 / 1 / 1 / 1 · ESP8684-WROOM-01C 2 / 1 / 1 / 0
- TWAI (CAN): ESP32-C3-WROOM-02 Yes · ESP8684-WROOM-01C No
- Dimensions: ESP32-C3-WROOM-02 18 × 20 × 3.2 mm · ESP8684-WROOM-01C 16 × 24 × 3.1 mm
- Pin count: ESP32-C3-WROOM-02 19 · ESP8684-WROOM-01C 23
- Temp range: ESP32-C3-WROOM-02 -40 to 85 °C · ESP8684-WROOM-01C -40 to 105 °C
- Crypto: ESP32-C3-WROOM-02 AES, SHA, RSA, HMAC, RNG · ESP8684-WROOM-01C ECC, SHA, RNG
- Digital signature: ESP32-C3-WROOM-02 Yes · ESP8684-WROOM-01C No
Compute & memory
⚑ flag an error| ESP32-C3-WROOM-02 | ESP8684-WROOM-01C | |
|---|---|---|
| CPU | RISC-V, 1-core | RISC-V, 1-core |
| Max clock≠ | 160 MHz | 120 MHz |
| SRAM≠ | 400 KB | 272 KB |
| ROM≠ | 384 KB | 576 KB |
| Flash options≠ | 4 / 8 / 16 MB | 2 / 4 MB |
| PSRAM | None | None |
| Co-processor | none | none |
Wireless
⚑ flag an error| ESP32-C3-WROOM-02 | ESP8684-WROOM-01C | |
|---|---|---|
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| Wi-Fi bands | 2.4GHz | 2.4GHz |
| Bluetooth | BLE 5.x | BLE 5.x |
| 802.15.4 (Thread/Zigbee) | No | No |
| Antenna | PCB | PCB |
Peripherals & I/O
⚑ flag an error| ESP32-C3-WROOM-02 | ESP8684-WROOM-01C | |
|---|---|---|
| Usable GPIO≠ | 15 | 14 |
| ADC≠ | 6× 12-bit | 5× 12-bit |
| USB≠ | USB-Serial-JTAG | USB-Serial(external) |
| UART / SPI / I²C / I²S≠ | 2 / 1 / 1 / 1 | 2 / 1 / 1 / 0 |
| TWAI (CAN)≠ | Yes | No |
| SD/MMC | No | No |
| Ethernet MAC | No | No |
| Touch | 0 | 0 |
Power
⚑ flag an error| ESP32-C3-WROOM-02 | ESP8684-WROOM-01C | |
|---|---|---|
| Operating voltage | 3.0-3.6 V | 3.0-3.6 V |
| Deep sleep | 5 µA | 5 µA |
Physical
⚑ flag an error| ESP32-C3-WROOM-02 | ESP8684-WROOM-01C | |
|---|---|---|
| Dimensions≠ | 18 × 20 × 3.2 mm | 16 × 24 × 3.1 mm |
| Pin count≠ | 19 | 23 |
| Temp range≠ | -40 to 85 °C | -40 to 105 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle | Active | Active |
Security
⚑ flag an error| ESP32-C3-WROOM-02 | ESP8684-WROOM-01C | |
|---|---|---|
| Secure boot | Yes | Yes |
| Flash encryption | Yes | Yes |
| Crypto≠ | AES, SHA, RSA, HMAC, RNG | ECC, SHA, RNG |
| Digital signature≠ | Yes | No |
| TRNG | Yes | Yes |