ESP32-C3FN4 - 4MB Flash Wi-Fi & BLE Microcontroller Chip


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Manufacturer: Espressif Systems

Delivery: Ships within 8 to 12 weeks
Free shipping to the US on orders over $100

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Product Information

Product Description

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The ESP32-C3FN4 SOC has 4MB flash and is the next generation replacement for the ESP8266EX SOC. This new chip makes new designs simple and is a very cost effective solution. Based on a single RISC-V core, performance has improved.

Other ESP32-C3FN4 updates include

  • advanced security
  • USB 2.0
  • BLE 5.0 with long range support
  • power management

The ESP32-C3FN4 is part of the ESP32-C3 family of parts and provides the lowest cost fully certified solution of all the Espressif parts.  

Trouble shooting is improved with on-chip debug module (DM), compliant with RISC-V debug specification v0.13. Also, an external debugger is supported using the industry-standard JTAG/USB port. The debugger provides direct system bus access (SBA) to memory and peripherals along with up to 8 trigger breakpoints/watchpoints.

ESP32-C3 Chip Comparison Guide


  • SMD IC ESP32-C3
  • RISC-V single-core MCU
  • 4 MB flash inside, 384 KB ROM, 400 KB SRAM (16 KB for cache), 8 KB SRAM in RTC
  • 2.4G Wi-Fi & BLE 5.0 combo
  • QFN 32-pin
  • 5*5 mm

Documents and Drivers


ESP32-C3FN4 Datasheet



LED PWM, Full Speed USB Serial/JTAG, General DMA, TWAI®


SPI, Duel SPI, Quad SPI, QPI, UART, I2C, I2S, 12-bit SAR ADCs, virtual Wi-Fi interfaces


  • 4MB Flash
  • 384 KB of ROM
  • 400 KB of on­chip SRAM
  • RTC memory: 8 KB of SRAM
  • 4 Kbit of eFuse



Temperature Range

-40°C to +85°C (-40°F to +185°F)


2 × 54-bit general-purpose timer

Watchdog Timer


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