Part: ESP32-C3 Series — Espressif Type: Ultra-Low-Power SoC with RISC-V Single-Core CPU Description: An ultra-low-power and highly-integrated MCU-based solution featuring a 32-bit RISC-V single-core processor up to 160 MHz, 2.4 GHz Wi-Fi (802.11b/g/n), and Bluetooth 5 (LE), with 384 KB ROM and 400 KB SRAM.

Operating Conditions:

• Supply voltage: 3.0–3.6 V
• Operating temperature: -40 to +105 °C (for ESP32-C3, ESP32-C3FH4)
• CPU clock frequency: up to 160 MHz

Absolute Maximum Ratings:

• Max supply voltage: 3.6 V
• Max junction/storage temperature: 150 °C

Key Specs:

• CPU: 32-bit RISC-V single-core, up to 160 MHz
• Internal ROM: 384 KB
• Internal SRAM: 400 KB (16 KB for cache)
• RTC SRAM: 8 KB
• Wi-Fi: IEEE 802.11 b/g/n, 20/40 MHz bandwidth, 1T1R, up to 150 Mbps
• Bluetooth LE: Bluetooth 5, Bluetooth mesh, high power mode (18 dBm), speeds 125 Kbps to 2 Mbps
• GPIOs: 22 programmable
• ADCs: 2 × 12-bit SAR ADCs, up to 6 channels

Features:

• Complete Wi-Fi subsystem supporting Station, SoftAP, Station + SoftAP, and promiscuous modes
• Bluetooth LE subsystem supporting Bluetooth 5 and Bluetooth mesh
• Cryptographic hardware accelerators (AES-128/256, Hash, RSA, HMAC, digital signature)
• Secure boot and flash encryption
• Random number generator
• Multiple peripheral interfaces: 3 × SPI, 2 × UART, 1 × I2C, 1 × I2S, LED PWM controller (6 channels), USB Serial/JTAG, TWAI® controller (CAN 2.0 compatible)
• Low power management with four power modes
• Internal co-existence mechanism for Wi-Fi and Bluetooth

Applications:

• Smart Home (light control, smart button, smart plug, indoor positioning)
• Industrial Automation (industrial robot, mesh network, HMI, industrial field bus)
• Health Care (health monitor, baby monitor)
• Consumer Electronics (smart watch, OTT devices, Wi-Fi/Bluetooth speaker, logger/proximity sensing toys)
• Smart Agriculture (smart greenhouse, smart irrigation, agriculture robot)
• Retail and Catering (POS machines, service robot)
• Audio Device (Internet music players, live streaming devices, Internet radio players)
• Generic Low-power IoT Sensor Hubs
• Generic Low-power IoT Data Loggers

Package:

• QFN32 (5×5 mm)

Espressif provides libraries for TCP/IP networking, ESP-WIFI-MESH networking, and other networking protocols over Wi-Fi. TLS 1.0, 1.1 and 1.2 is also supported.

With ultra-low power consumption, ESP32-C3 is an ideal choice for IoT devices in the following areas:

• Smart Home
• -Light control
• -Smart button
• -Smart plug
• -Indoor positioning
• Industrial Automation
• -Industrial robot
• -Mesh network
• -Human machine interface (HMI)
• -Industrial field bus
• Health Care
• -Health monitor
• -Baby monitor
• Consumer Electronics
• -Smart watch and bracelet
• -Over-the-top (OTT) devices
• -Wi-Fi and Bluetooth speaker
• -Logger toys and proximity sensing toys
• Smart Agriculture
• -Smart greenhouse
• -Smart irrigation
• -Agriculture robot
• Retail and Catering
• -POS machines
• -Service robot
• Audio Device
• -Internet music players
• -Live streaming devices
• -Internet radio players
• Generic Low-power IoT Sensor Hubs
• Generic Low-power IoT Data Loggers
• Flash encryption
• 4096-bit OTP, up to 1792 bits for use
• Cryptographic hardware acceleration:
• -AES-128/256 (FIPS PUB 197)
• Permission Control
• SHA Accelerator (FIPS PUB 180-4)
• RSA Accelerator
• Random Number Generator (RNG)
• HMAC
• Digital signature

ESP32-C3FN4 Pinout

Package: 32-VFQFN Exposed Pad

Notes

• Pin numbers 1–6 were inferred from the 32-pin VFQFN package standard and the datasheet table starting at pin 7. The source table does not explicitly list pins 1–6; they are derived from typical QFN pinout conventions and the fact that the table begins at pin 7.
• CHIP_EN (pin 7) must not be left floating.
• SPI flash interface pins (SPIHD, SPIWP, SPICS0, SPICLK, SPID, SPIQ) are not recommended for other uses.
• GPIO11 appears in two contexts: as a dedicated pin name (pin 5) and as an alternate function of VDD_SPI (pin 18).
• USB pins (GPIO18, GPIO19) support USB_D− and USB_D+ respectively.
• XTAL_N and XTAL_P are for external crystal connection.
• Multiple VDDA and GND pins provide power distribution across the package.

Table 14: DC Characteristics (3.3 V, 25 °C)

Stresses beyond the absolute maximum ratings listed in the table below may cause permanent damage to the device. These are stress ratings only, and do not refer to the functional operation of the device.

Table 11: Absolute Maximum Ratings

Table 12: Recommended Operating Conditions

Figure 8: QFN32 (5×5 mm) Package

Table 33: Receiver Characteristics ­ Bluetooth LE 500 Kbps

• For the source file of recommended PCB land pattern (dxf), you can view it with Autodesk Viewer;
• For information about tape, reel, and product marking, please refer to Espressif Chip-Packing Information .