# ESP32-C3 SuperMini Dev Board

> ESP32-C3 SuperMini is the thumb-sized 22.5 × 18 mm ESP32-C3FN4 board: 160 MHz RISC-V, 4 MB flash, 400 KB SRAM, Wi-Fi 802.11 b/g/n and Bluetooth 5 LE, USB-C, 16 pins at 0.6″ row spacing with 13 GPIO (6 ADC), BOOT and RST buttons, blue LED on GPIO8, 3.3 V logic and an onboard 3.3 V regulator, about $6. Sources disagree on the USB bridge, SPI pins and max input.

- Manufacturer: Generic (unbranded)
- Part number: ESP32-C3 SuperMini
- Category: Development boards
- Canonical page: https://www.xirkit.io/products/generic-esp32-c3-supermini-dev-board-d19e
- Pinout: https://www.xirkit.io/products/generic-esp32-c3-supermini-dev-board-d19e/pinout
- Structured JSON: https://www.xirkit.io/products/generic-esp32-c3-supermini-dev-board-d19e/data.json
- Source: Xirkit structured parts catalog — every value traced to a cited document; unknowns are explicit.

## Key specifications

| Property | Value |
| --- | --- |
| Main chip | ESP32-C3FN4 |
| Chips on board | ESP32-C3FN4 |
| Exposed GPIO | 13 |
| Documented board pins | 16 |
| I/O voltage | 3.3 V |
| Supply voltage | 3.3–7 V |
| Flash | 4,096 KB |
| SRAM | 400 KB |
| Interfaces | spi, adc, jtag, gpio, gpio_matrix, control, clock, other, i2c, led, uart, usb |
| Frameworks | Arduino IDE, ESP-IDF, MicroPython, Lua |
| Dimensions | 22.5 × 18 mm |

## Pinout (16 pins, 13 with electrical limits)

| Pin | Position | Kind | Chip pad | Functions | VIH | VIL | VOH | VOL | IOH | IOL | 5 V tolerant |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 5V | R1 | power in | — | power_in | — | — | — | — | — | — | — |
| G | R2 | ground | — | ground | — | — | — | — | — | — | — |
| 3.3 | R3 | power in | — | power_in | — | — | — | — | — | — | — |
| 4 | R4 | gpio | GPIO4 | SCK (Arduino default), A4, ADC1_CH4, FSPI_HD, MTMS, GPIO4, GPIO matrix (any routable peripheral signal) | 2.475–3.6 V | -0.3–0.825 V | ≥ 2.64 V | ≤ 0.33 V | 40 mA typ | 28 mA typ | no |
| 3 | R5 | gpio | GPIO3 | ADC1_CH3, GPIO3, GPIO matrix (any routable peripheral signal) | 2.475–3.6 V | -0.3–0.825 V | ≥ 2.64 V | ≤ 0.33 V | 40 mA typ | 28 mA typ | no |
| 2 | R6 | gpio | GPIO2 | ADC1_CH2, SPI2_MISO, Strapping, GPIO2, FSPIQ, GPIO matrix (any routable peripheral signal) | 2.475–3.6 V | -0.3–0.825 V | ≥ 2.64 V | ≤ 0.33 V | 40 mA typ | 28 mA typ | no |
| 1 | R7 | gpio | GPIO1 | ADC1_CH1, GPIO1, XTAL_32K_N, GPIO matrix (any routable peripheral signal) | 2.475–3.6 V | -0.3–0.825 V | ≥ 2.64 V | ≤ 0.33 V | 40 mA typ | 28 mA typ | no |
| 0 | R8 | gpio | GPIO0 | ADC1_CH0, RTC_GPIO0, GPIO0, XTAL_32K_P, GPIO matrix (any routable peripheral signal) | 2.475–3.6 V | -0.3–0.825 V | ≥ 2.64 V | ≤ 0.33 V | 40 mA typ | 28 mA typ | no |
| 5 | L1 | gpio | GPIO5 | MISO (Arduino default), A5, ADC2_CH0, FSPI_WP, RTC_GPIO5, MTDI, GPIO5, GPIO matrix (any routable peripheral signal) | 2.475–3.6 V | -0.3–0.825 V | ≥ 2.64 V | ≤ 0.33 V | 40 mA typ | 28 mA typ | no |
| 6 | L2 | gpio | GPIO6 | MOSI (Arduino default), SPI2_SCK, FSPICLK, MTCK, GPIO6, GPIO matrix (any routable peripheral signal) | 2.475–3.6 V | -0.3–0.825 V | ≥ 2.64 V | ≤ 0.33 V | 40 mA typ | 28 mA typ | no |
| 7 | L3 | gpio | GPIO7 | SS (Arduino default), SPI2_MOSI, FSPID, MTDO, GPIO7, GPIO matrix (any routable peripheral signal) | 2.475–3.6 V | -0.3–0.825 V | ≥ 2.64 V | ≤ 0.33 V | 40 mA typ | 28 mA typ | no |
| 8 | L4 | gpio | GPIO8 | SDA (Arduino default), blue user LED, LED_BUILTIN, Strapping, GPIO8, GPIO matrix (any routable peripheral signal) | 2.475–3.6 V | -0.3–0.825 V | ≥ 2.64 V | ≤ 0.33 V | 40 mA typ | 28 mA typ | no |
| 9 | L5 | gpio | GPIO9 | SCL (Arduino default), BOOT Button, Strapping, GPIO9, GPIO matrix (any routable peripheral signal) | 2.475–3.6 V | -0.3–0.825 V | ≥ 2.64 V | ≤ 0.33 V | 40 mA typ | 28 mA typ | no |
| 10 | L6 | gpio | GPIO10 | SPI2_CS, FSPICS0, GPIO10, GPIO matrix (any routable peripheral signal) | 2.475–3.6 V | -0.3–0.825 V | ≥ 2.64 V | ≤ 0.33 V | 40 mA typ | 28 mA typ | no |
| 20 | L7 | gpio | GPIO20 | RX (Serial default), U0_RXD, GPIO20, GPIO matrix (any routable peripheral signal) | 2.475–3.6 V | -0.3–0.825 V | ≥ 2.64 V | ≤ 0.33 V | 40 mA typ | 28 mA typ | no |
| 21 | L8 | gpio | GPIO21 | TX (Serial default), U0_TXD, GPIO21, GPIO matrix (any routable peripheral signal) | 2.475–3.6 V | -0.3–0.825 V | ≥ 2.64 V | ≤ 0.33 V | 40 mA typ | 28 mA typ | no |

## Where to buy

| Supplier | Price | Stock | Checked | URL |
| --- | --- | --- | --- | --- |
| protosupplies.com | 5.95 USD | in_stock | 2026-10-12 | https://protosupplies.com/product/esp32c3-supermini/ |

## FAQ

**What microcontroller does the ESP32-C3 SuperMini Dev Board use?**

The ESP32-C3 SuperMini Dev Board is built around the ESP32-C3FN4.

**How many GPIO pins does the ESP32-C3 SuperMini Dev Board have?**

13 GPIO pins are exposed. Xirkit documents 16 board pins, 13 of them with pin-level electrical limits.

**Are the ESP32-C3 SuperMini Dev Board I/O pins 5 V tolerant?**

No. The I/O pins are not 5 V tolerant — they run at 3.3 V logic; use a level shifter for 5 V signals. Input-high threshold: 2.475–3.6 V.

**How much current can a ESP32-C3 SuperMini Dev Board GPIO pin source?**

Documented output-high current per pin: 40 mA typ. Values are traced to the chip datasheet; see the pinout table for per-pin limits and conditions.

**What voltage powers the ESP32-C3 SuperMini Dev Board?**

Supply range 3.3–7 V. Power inputs: 5V (5–7 V), 3.3.

**How much does the ESP32-C3 SuperMini Dev Board cost?**

From $5.95 at protosupplies.com. Prices are observed unit prices before tax and shipping.

**What are the ESP32-C3 SuperMini Dev Board dimensions?**

22.5 × 18 mm. A STEP model is available for enclosure fit checks.

**Which interfaces does the ESP32-C3 SuperMini Dev Board support?**

spi, adc, jtag, gpio, gpio_matrix, control, clock, other, i2c, led, uart, usb.

**How do I program the ESP32-C3 SuperMini Dev Board?**

Supported frameworks: Arduino IDE, ESP-IDF, MicroPython, Lua.

**Where does this ESP32-C3 SuperMini Dev Board data come from?**

Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.

## Sources

- [ESP32-C3 SuperMini Dev Board datasheet](https://protosupplies.com/product/esp32c3-supermini/)
- [protosupplies.com listing](https://protosupplies.com/product/esp32c3-supermini/)

## Part graph

### Built from

- [ESP32-C3FN4](https://www.xirkit.io/products/category/dev-boards/esp32-c3fn4) — main processor on the ESP32-C3 SuperMini Dev Board

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