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ESP32-C6 pinout & GPIO reference
Espressif’s first Wi-Fi 6 + Thread/Zigbee combo chip and the default pick for Matter smart-home devices. GPIO 0–6 all carry ADC channels, while GPIO 24–30 are reserved for SPI flash — on in-package-flash variants those seven pins simply disappear.
Data verified：2026-10-20 · Cross-checked against Espressif datasheets and the ESP-IDF programming guide. Always confirm with the official document before finalizing a design.
Official documentation：link 1 · link 2
Verify against official docs：Exact SRAM size and low-power core clock · How many GPIOs are broken out on each package (QFN32 / QFN40)
Key specifications
| Core | 32-bit RISC-V high-performance core + low-power core |
|---|---|
| Clock | HP core up to 160 MHz |
| SRAM | 512 KB SRAM (verify against official docs) |
| Wireless | Wi-Fi 6 (802.11ax) 2.4 GHz · Bluetooth 5 (LE) · IEEE 802.15.4 Thread / Zigbee |
| USB | USB Serial/JTAG (GPIO12/13) |
| ADC | 12-bit SAR, 7 channels (GPIO0–6 = ADC1_CH0–6) |
| DAC | None |
| Touch | None |
| GPIO | 31 physical GPIOs: 0–30 (only 22 usable on SiP-flash variants) |
| Strapping | GPIO4 / GPIO5 / GPIO8 / GPIO9 / GPIO15 |
Traps that cost you a board respin
- GPIO 24–30 are normally used for SPI flash and not recommended elsewhere; on SiP-flash variants they are not fanned out at all.
- GPIO 12/13 default to USB Serial/JTAG; the driver disables USB-JTAG if you claim them as GPIO.
- Strapping pins are GPIO4 / 5 / 8 / 9 / 15, with GPIO8 and GPIO9 selecting the boot mode.
- JTAG lands on GPIO4 (MTMS) / 5 (MTDI) / 6 (MTCK) / 7 (MTDO), taken over by USB-JTAG by default.
- GPIO10 / GPIO11 are not fanned out on SiP-flash variants; GPIO14 is not fanned out on non-SiP variants.
Full GPIO table
| GPIO | Status | Alternate functions |
|---|---|---|
GPIO0 | Usable | ADC1_CH0 |
GPIO1 | Usable | ADC1_CH1 |
GPIO2 | Usable | ADC1_CH2 |
GPIO3 | Usable | ADC1_CH3 |
GPIO4 | Usable | StrappingADC1_CH4JTAG TMS |
GPIO5 | Usable | StrappingADC1_CH5JTAG TDI |
GPIO6 | Usable | ADC1_CH6JTAG TCK |
GPIO7 | Usable | JTAG TDO |
GPIO8 | Usable | Strapping (boot mode) |
GPIO9 | Usable | Strapping (default pull-up 1) |
GPIO10 | Usable | Not fanned out on SiP-flash variants |
GPIO11 | Usable | Not fanned out on SiP-flash variants |
GPIO12 | Usable | USB D− (USB Serial/JTAG) |
GPIO13 | Usable | USB D+ (USB Serial/JTAG) |
GPIO14 | Usable | Not fanned out on non-SiP variants |
GPIO15 | Usable | Strapping (JTAG source) |
GPIO16 | Usable | General GPIO |
GPIO17 | Usable | General GPIO |
GPIO18 | Usable | General GPIO |
GPIO19 | Usable | General GPIO |
GPIO20 | Usable | General GPIO |
GPIO21 | Usable | General GPIO |
GPIO22 | Usable | General GPIO |
GPIO23 | Usable | General GPIO |
GPIO24 | Unusable | SPI0/1 · flash |
GPIO25 | Unusable | SPI0/1 · flash |
GPIO26 | Unusable | SPI0/1 · flash |
GPIO27 | Unusable | SPI0/1 · flash |
GPIO28 | Unusable | SPI0/1 · flash |
GPIO29 | Unusable | SPI0/1 · flash |
GPIO30 | Unusable | SPI0/1 · flash |
Individual GPIO pages
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Chip comparisonESP32 / S2 / S3 / C3 / C6 / H2 / P4
Peripheral guidesI²C · SPI · UART · RMT · LEDC · deep sleep