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ESP32-C3 Super Mini

ESP32-C3 Super Mini pinout table

Tiny 22.5 × 18 mm board: ESP32-C3FH4 (RISC-V 160 MHz, 4 MB in-package flash), Wi-Fi 4 + BLE 5, USB-C wired straight to USB Serial/JTAG.

Logic: 3.3 V, not 5 V tolerant
Size: 22.52 × 18 mm, 2 rows × 8 pins, 2.54 mm pitch
ADC: ADC1: IO0–IO4 (5 channels) · ADC2: IO5
USB: USB-C wired to USB Serial/JTAG (IO18/IO19, not on the header)
Button: BOOT = IO9, RST = CHIP_EN
Default Arduino pins: SDA IO8 · SCL IO9 · MOSI IO6 · MISO IO5 · SCK IO4 · SS IO7 · LED IO8 (arduino-esp32, nologo_esp32c3_super_mini)

Pin	Header	GPIO	Type	Functions	Notes
IO5	L-1	5	Analog	ADC2_CH0, FSPIWP · MTDI, Arduino MISO	ADC2 is not factory-calibrated and is not operable on some chip revisions (see errata). For analog readings use IO0–IO4 (ADC1).
IO6	L-2	6	GPIO	FSPICLK · MTCK, Arduino MOSI
IO7	L-3	7	GPIO	FSPID · MTDO, Arduino SS
IO8	L-4	8	Strapping ⚠	Arduino SDA, Onboard blue LED (LOW = on)	Strapping: floating at reset; must be HIGH to enter download mode, and also controls ROM log printing. The onboard blue LED is on this pin (per sellers' pinout, LOW = on).
IO9	L-5	9	Strapping ⚠	Arduino SCL, BOOT button	Strapping: weak pull-up by default. LOW at reset = download mode (BOOT button). Don't attach loads that pull it LOW, and no large capacitor.
IO10	L-6	10	GPIO	FSPICS0
RX	L-7	20	UART/I2C	U0RXD, IO20	UART0 RX: UART flashing/log function. The Super Mini flashes over USB-C (USB Serial/JTAG) so this pin is usable, but avoid it if you need UART flashing.
TX	L-8	21	UART/I2C	U0TXD, IO21	UART0 TX: the chip prints its ROM log here at boot. The Super Mini flashes over USB-C, so it is still usable as GPIO/TX.
5V	R-1	–	Power	VBUS from USB-C / 5V input	Connected to the USB-C VBUS. If you feed external 5V here, don't plug USB in at the same time.
GND	R-2	–	GND	Ground
3V3	R-3	–	Power	3.3 V LDO output	Onboard LDO output. The chip needs a ≥ 0.5 A supply; keep external load small.
IO4	R-4	4	Analog	ADC1_CH4, FSPIHD · MTMS, Arduino SCK
IO3	R-5	3	Analog	ADC1_CH3
IO2	R-6	2	Strapping ⚠	ADC1_CH2, FSPIQ	Strapping: floating at reset. It doesn't decide the boot mode, but the datasheet recommends pulling it HIGH because of possible glitches.
IO1	R-7	1	Analog	ADC1_CH1, XTAL_32K_N
IO0	R-8	0	Analog	ADC1_CH0, XTAL_32K_P

Manufacturer documents

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