# Seeed Studio XIAO ESP32C3

> Thumb-sized ESP32-C3 (RISC-V 160 MHz, Wi-Fi 4 + BLE 5) board: 400 KB SRAM, 4 MB flash, 11 GPIO (4 ADC) at 3.3 V, USB-C, Li-ion charging, TLV75733 3.3 V LDO, castellated 21 × 17.8 mm.

- Manufacturer: Seeed Studio
- Part number: 113991054
- Category: Development boards
- Canonical page: https://www.xirkit.io/products/seeed-studio-xiao-esp32c3-99be
- Pinout: https://www.xirkit.io/products/seeed-studio-xiao-esp32c3-99be/pinout
- Structured JSON: https://www.xirkit.io/products/seeed-studio-xiao-esp32c3-99be/data.json
- Source: Xirkit structured parts catalog — every value traced to a cited document; unknowns are explicit.

## Key specifications

| Property | Value |
| --- | --- |
| Main chip | ESP32-C3FH4 |
| Chips on board | ESP32-C3FH4 |
| Exposed GPIO | 11 |
| Documented board pins | 22 |
| I/O voltage | 3.3 V |
| Supply voltage | 3.7–5 V |
| Flash | 4,096 KB |
| SRAM | 400 KB |
| Interfaces | adc, gpio, spi, gpio_matrix, jtag, i2c, uart, control, usb |
| Frameworks | Arduino (esp32 core), MicroPython |
| Dimensions | 20.955 × 17.78 × 1.6 mm |
| Operating temperature | -40 to 85 °C |
| Certifications | FCC (FCC ID Z4T-XIAOESP32C3), CE, TELEC (R 204-B00704) |

## Pinout (22 pins, 16 with electrical limits)

| Pin | Position | Kind | Chip pad | Functions | VIH | VIL | VOH | VOL | IOH | IOL | 5 V tolerant |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| D0 | J2 · 1 | gpio | GPIO2 | Analog, ADC1_CH2, 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 |
| D1 | J2 · 2 | gpio | GPIO3 | Analog, 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 |
| D2 | J2 · 3 | gpio | GPIO4 | Analog, ADC1_CH4, FSPIHD, 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 |
| D3 | J2 · 4 | gpio | GPIO5 | Analog, ADC2_CH0, FSPIWP, 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 |
| D4 | J2 · 5 | gpio | GPIO6 | SDA, 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 |
| D5 | J2 · 6 | gpio | GPIO7 | SCL, 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 |
| D6 | J2 · 7 | gpio | GPIO21 | TX, U0TXD, 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 |
| D7 | J1 · 8 | gpio | GPIO20 | RX, U0RXD, 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 |
| D8 | J1 · 9 | gpio | GPIO8 | SCK, 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 |
| D9 | J1 · 10 | gpio | GPIO9 | MISO, BOOT button, 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 |
| D10 | J1 · 11 | gpio | GPIO10 | MOSI, 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 |
| 3V3 | J1 · 12 | power out | — | power_out | — | — | — | — | — | — | — |
| GND | J1 · 13 | ground | — | ground | — | — | — | — | — | — | — |
| 5V | J1 · 14 | power in | — | power_in | — | — | — | — | — | — | — |
| TP1 | bottom_pads · TP1 | ground | — | ground | — | — | — | — | — | — | — |
| TP2 | bottom_pads · TP2 | gpio | GPIO4 | MTMS, GPIO4, FSPIHD, ADC1_CH4, 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 |
| TP3 | bottom_pads · TP3 | gpio | GPIO5 | MTDI, GPIO5, FSPIWP, ADC2_CH0, 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 |
| TP4 | bottom_pads · TP4 | gpio | GPIO6 | MTCK, GPIO6, FSPICLK, 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 |
| TP5 | bottom_pads · TP5 | gpio | GPIO7 | MTDO, GPIO7, FSPID, 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 |
| TP6 | bottom_pads · TP6 | control | CHIP_EN | en | 2.475–3.6 V | -0.3–0.825 V | — | — | — | — | no |
| BAT+ | bottom_pads · BAT+ | power in | — | power_in | — | — | — | — | — | — | — |
| GND | bottom_pads · GND pad | ground | — | ground | — | — | — | — | — | — | — |

## Where to buy

| Supplier | Price | Stock | Checked | URL |
| --- | --- | --- | --- | --- |
| Seeed Studio | 4.9 USD | in_stock | 2026-09-24 | https://www.seeedstudio.com/Seeed-XIAO-ESP32C3-p-5431.html |

## FAQ

**What microcontroller does the Seeed Studio XIAO ESP32C3 use?**

The Seeed Studio XIAO ESP32C3 is built around the ESP32-C3FH4, alongside TLV75733PDBVR.

**How many GPIO pins does the Seeed Studio XIAO ESP32C3 have?**

11 GPIO pins are exposed. Xirkit documents 22 board pins, 16 of them with pin-level electrical limits.

**Are the Seeed Studio XIAO ESP32C3 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 Seeed Studio XIAO ESP32C3 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 Seeed Studio XIAO ESP32C3?**

Supply range 3.7–5 V. Power inputs: 5V, BAT+.

**How much does the Seeed Studio XIAO ESP32C3 cost?**

From $4.9 at Seeed Studio. Prices are observed unit prices before tax and shipping.

**What are the Seeed Studio XIAO ESP32C3 dimensions?**

20.955 × 17.78 × 1.6 mm. A STEP model is available for enclosure fit checks.

**Which interfaces does the Seeed Studio XIAO ESP32C3 support?**

adc, gpio, spi, gpio_matrix, jtag, i2c, uart, control, usb.

**How do I program the Seeed Studio XIAO ESP32C3?**

Supported frameworks: Arduino (esp32 core), MicroPython.

**Where does this Seeed Studio XIAO ESP32C3 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

- [Seeed Studio XIAO ESP32C3 datasheet](https://wiki.seeedstudio.com/XIAO_ESP32C3_Getting_Started/)
- [Seeed Studio listing](https://www.seeedstudio.com/Seeed-XIAO-ESP32C3-p-5431.html)

## Part graph

### Built from

- [ESP32-C3FH4](https://www.xirkit.io/products/category/dev-boards/esp32-c3fh4) — main processor on the Seeed Studio XIAO ESP32C3
- TLV75733PDBVR — voltage regulator on the Seeed Studio XIAO ESP32C3

### Alternatives (by use case)

- [Raspberry Pi Pico 2 W](https://www.xirkit.io/products/raspberry-pi-pico-2-w-b3bc) — Both serve connected iot and wireless sensor nodes — check the trade-offs; $7 vs $4.9
- [Raspberry Pi Pico W](https://www.xirkit.io/products/raspberry-pi-pico-w-8b30) — Both serve connected iot and wireless sensor nodes — check the trade-offs; $6 vs $4.9

### Pin-compatible

- [Adafruit QT Py RP2040](https://www.xirkit.io/products/adafruit-qt-py-rp2040-bdcf) — Same Seeed XIAO footprint and pad layout (guide p10) — different main chip
- [Seeed Studio XIAO nRF52840 Sense](https://www.xirkit.io/products/seeed-studio-xiao-nrf52840-sense-a973) — Same form factor and header layout as the Seeed Studio XIAO nRF52840 Sense — pin-compatible, different main chip
- [Seeed Studio XIAO ESP32-S3](https://www.xirkit.io/products/seeed-studio-xiao-esp32-s3-f8f5) — Same form factor and header layout as the Seeed Studio XIAO ESP32-S3 — pin-compatible, different main chip
- [Seeed Studio XIAO RP2040](https://www.xirkit.io/products/seeed-studio-xiao-rp2040-53de) — Same form factor and header layout as the Seeed Studio XIAO RP2040 — pin-compatible, different main chip