Espressif ESP32-C3FH4 IC Chip RISC-V Wi-Fi + Bluetooth 5.0 SoC 160MHz 4MB Flash QFN-32

ESP32-C3FH4 Product Overview

The ESP32-C3FH4 is an ultra-low-power, highly integrated RISC-V MCU System-on-Chip (SoC) from Espressif Systems, featuring a 32-bit RISC-V single-core processor running at up to 160MHz. ESP32-C3FH4 is housed in a QFN-32-EP (5×5mm) package, the chip integrates 4MB flash, 400KB SRAM, 384KB ROM, and 8KB RTC SRAM. The ESP32-C3FH4 supports 2.4GHz Wi-Fi (802.11 b/g/n) and Bluetooth® 5 (LE) dual-mode wireless communication, offering industry-leading low-power RF performance. ESP32-C3FH4 provides 22 programmable GPIOs and supports rich peripheral interfaces including SPI, UART, I2C, I2S, LED PWM, USB Serial/JTAG, and TWAI (CAN 2.0). The ESP32-C3FH4 integrates comprehensive hardware security mechanisms including AES, SHA, RSA hardware accelerators, RNG, HMAC, digital signature modules, flash encryption, and secure boot. The chip is widely used in smart home, industrial automation, healthcare, consumer electronics, and smart agriculture.

ESP32-C3FH4 Key Features

The ESP32-C3FH4 is powered by a 32-bit RISC-V single-core processor running at up to 160MHz, achieving a CoreMark® score of 407.22 (single-core at 160MHz, 2.55 CoreMark/MHz). ESP32-C3FH4 on-chip memory includes 384KB ROM, 400KB SRAM (16KB dedicated to cache), and 8KB RTC SRAM. The chip integrates 4MB flash and supports external flash expansion via SPI/QSPI/OSPI interfaces.

ESP32-C3FH4's Wi-Fi subsystem supports IEEE 802.11b/g/n with 20MHz and 40MHz bandwidth in the 2.4GHz band. It supports 1T1R mode with data rates up to 150Mbps, and offers Station, SoftAP, Station + SoftAP, and promiscuous modes. Output power reaches up to +21dBm, with receiver sensitivity down to -105dBm and receive current around 84-87mA. Wi-Fi and Bluetooth share the same antenna with a built-in coexistence mechanism.

For Bluetooth, the ESP32-C3FH4 supports Bluetooth LE 5 and Bluetooth mesh. ESP32-C3FH4 supports data rates of 125Kbps, 500Kbps, 1Mbps, and 2Mbps, along with Advertising Extensions, Multiple Advertisement Sets, and Channel Selection Algorithm #2.

The ESP32-C3FH4 provides 22 programmable GPIOs. Digital interfaces include 3×SPI, UART, I2C, I2S, RMT, LED PWM (6 channels), USB Serial/JTAG controller, GDMA, and TWAI® controller (compatible with ISO 11898-1, CAN Specification 2.0). Analog interfaces include 2×12-bit SAR ADCs (up to 6 channels) and a temperature sensor.

ESP32-C3FH4 security features include hardware accelerators (AES, SHA, and RSA) , RNG, HMAC, digital signature modules, as well as flash encryption and Secure Boot signature verification.

The ESP32-C3FH4 supports four low-power states including Active, Modem-sleep, Light-sleep, and Deep-sleep. Deep-sleep current is as low as 5μA. Operating voltage range is 3V ~ 3.6V, and operating temperature range is -40℃ ~ +105℃.

ESP32-C3FH4 Applications

With its ultra-low power consumption, RISC-V open architecture, and robust wireless connectivity, the ESP32-C3FH4 is widely used in IoT and embedded applications:

Smart Home: ESP32-C3FH4 is used in smart lighting, smart plugs, smart locks, thermostats, smart speakers

Industrial Automation: ESP32-C3FH4 is applied in industrial sensors, equipment monitoring, remote data acquisition

Healthcare: ESP32-C3FH4 is suitable for portable medical devices, health monitors, wearable sensors

Consumer Electronics: ESP32-C3FH4 is found in smart toys, remote controls, wearables, wireless audio devices

Smart Agriculture: ESP32-C3FH4 enables environmental monitoring sensors, smart irrigation control

Education & Prototyping: ESP32-C3FH4 supports RISC-V learning platforms, Arduino projects, product prototyping

ESP32-C3FH4 Advantages and Highlights

The ESP32-C3FH4 is a highly cost-effective RISC-V SoC solution from Espressif, specifically designed for low-cost, low-power IoT connectivity applications. Its core advantage lies in the single-chip integration of a RISC-V processor, Wi-Fi, Bluetooth, 4MB Flash, and rich peripherals, providing developers with a streamlined, efficient wireless connectivity platform.

Integrated 4MB Flash Simplifies PCB Design: The ESP32-C3FH4 integrates 4MB flash directly inside the chip package, eliminating the need for an external flash chip. This saves PCB area, simplifies hardware design, and reduces BOM cost and supply chain complexity.

RISC-V Open Architecture + 160MHz High Performance: Powered by a 32-bit RISC-V single-core processor running at up to 160MHz with a CoreMark score of 407.22, the open-source RISC-V ISA offers developers greater flexibility and autonomy, while the high clock speed ensures smooth operation of complex applications and wireless protocol stacks.

Ultra-Low Power for Battery-Powered Devices: The ESP32-C3FH4 supports four low-power states with Deep-sleep current as low as 5μA. Combined with fine-grained clock gating, dynamic voltage and frequency scaling, and adjustable RF output power, it achieves optimal balance between communication range, data rate, and power consumption — ideal for battery-powered portable and wearable devices.

High Integration Reduces System Cost: The chip integrates a complete RF front-end including Wi-Fi MAC, RF and baseband, antenna switch, power amplifier, and low-noise amplifier, eliminating external RF components. The integrated USB Serial/JTAG controller enables direct programming and debugging via USB without an external USB-to-serial chip.

Comprehensive Hardware Security: The ESP32-C3FH4 integrates AES, SHA, and RSA hardware accelerators, RNG, HMAC, digital signature modules, as well as flash encryption and Secure Boot. These security features meet the stringent requirements for data security and device identity authentication in IoT applications.

Industrial-Grade Wide Temperature Range: With an operating temperature range of -40℃ ~ +105℃, the ESP32-C3FH4 meets industrial-grade requirements and adapts to harsh environments. Output power up to +21dBm and receiver sensitivity down to -105dBm ensure robust wireless coverage.

Mature Software Ecosystem: Espressif provides a complete ESP-IDF development framework, with support for Arduino IDE and MicroPython. ESP-IDF includes rich APIs, example code, and debugging tools, significantly lowering the development barrier and accelerating time-to-market.

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FAQs:

Q: What is the ESP32-C3FH4 chip?
A: ESP32-C3FH4 is an ultra-low-power MCU SoC from Espressif, integrating 2.4GHz Wi-Fi and Bluetooth Low Energy, powered by a RISC-V single-core processor, and suitable for various IoT devices.

Q: What is the core processor and maximum frequency?
A: ESP32-C3FH4 features a RISC-V 32-bit single-core processor with a maximum clock speed of 160 MHz, achieving a CoreMark score of 407.22 at 160 MHz.

Q: How much internal memory does it have?
A: ESP32-C3FH4 includes 384 KB ROM and 400 KB SRAM (of which 16 KB is dedicated to Cache), and also has 4 MB of embedded Flash for program and data storage.

Q: What wireless communication protocols does it support?
A: ESP32-C3FH4 supports Wi-Fi 4 (802.11 b/g/n) and Bluetooth 5 (LE). Its Wi-Fi data rate can reach up to 150 Mbps, and Bluetooth supports multiple data rates from 125 kbps to 2 Mbps.

Q: What package and dimensions does it use?
A: ESP32-C3FH4 uses a QFN-32-EP package with an exposed thermal pad, and its physical dimensions are 5.0 mm x 5.0 mm.

Q: What are the operating voltage and temperature ranges?
A: For ESP32-C3FH4, the standard operating voltage range is 3 V to 3.6 V. The operating temperature range covers -40°C to +105°C, meeting industrial-grade standards.

Q: What common peripheral interfaces are supported?
A: ESP32-C3FH4 provides up to 22 programmable GPIOs, along with SPI, UART, I2C, I2S, LED PWM controller, IR infrared transceiver, and a full-speed USB serial/JTAG controller.

Q: What security features does the chip have?
A: ESP32-C3FH4 supports secure boot and Flash encryption, and includes hardware cryptographic accelerators for AES-128, SHA, RSA, as well as a True Random Number Generator (TRNG).

Q: How is its power consumption performance?
A: ESP32-C3FH4 supports four operating modes: Active, Modem-sleep, Light-sleep, and Deep-sleep. In Deep-sleep mode, the current is as low as 5 µA.

Q: What are the main application scenarios for this chip?
A: ESP32-C3FH4 is widely used in smart home, industrial automation, consumer electronics, smart agriculture, and healthcare, where low-power devices require stable wireless connectivity.