How many ESP32 series currently exist?

Currently, the Espressif ecosystem features 12 primary series: classic ESP32, ESP32-S2, ESP32-S3, ESP32-S31, ESP32-C2, ESP32-C3, ESP32-C5, ESP32-C6, ESP32-C61, ESP32-P4, ESP32-H2, and ESP32-H4.

What are the latest series from Espressif?

The newest series include the ESP32-P4 (high-performance dual-core RISC-V at 400 MHz), the ESP32-C5 (first dual-band 2.4/5 GHz Wi-Fi chip from Espressif), and the ESP32-C61 (cost-effective Wi-Fi 6 and Bluetooth 6).

RISC-V single-core 32-bit

ESP32-C2

Ultra-cost-effective and low-power RISC-V microcontroller with Wi-Fi 4 and Bluetooth 5.3 LE

Official datasheet Programming guide Technical reference manual

Processor: Single-core; Up to 120 MHz
SRAM: 272 KB (16 KB for cache); + No RTC SRAM
GPIO: 14; programmable pins
Architecture: RISC-V; RISC-V single-core 32-bit

Official development kit

Official Espressif board for the ESP32-C2 series.

Pins with usage restrictions

Not every pin on the ESP32-C2 is free for general-purpose use. 7 of them have conditions: occupied by memory, sampled during boot, or function as input only. Check before finalizing your schematic.

Strapping pins (boot mode)

2 pins

GPIO8
GPIO9

The chip samples the logic level of these pins during reset to determine the boot mode. You can use them after booting, but external circuitry must not force the wrong level during reset, or the board will fail to boot or enter download mode unexpectedly.

Flashing and debugging

4 pins

GPIO4
GPIO5
GPIO6
GPIO7

These are the flashing UART and JTAG lines. They can still be used as GPIO, but reusing them removes the ability to flash and debug the board without disconnecting connected peripherals.

Must not float

1 pin

CHIP_EN

Require a defined hardware logic level: external pull-up or RC delay circuit. Leaving them floating causes random resets or unstable boot behavior.

These groups are derived from the same data as the pinout diagram. There you can see every pin's full functions, power domain, and complete engineering notes.

Open pinout diagram

Processor

Architecture: RISC-V single-core 32-bit
Cores: 1 (Single-core)
Frequency: Up to 120 MHz
ULP Coprocessor: No
AI Accelerators: No

Connectivity

Wi-Fi: IEEE 802.11 b/g/n (2.4 GHz, up to 72.2 Mbps)
Bluetooth: Bluetooth 5.3 LE (certified)
Zigbee/Thread: No
Matter: No
Ethernet: No
CAN: No

Tools and availability

Minimum ESP-IDF: v5.0
Arduino Core: Yes (1 board definition in official core)
Debugging: External JTAG (requires probe, e.g. ESP-PROG)
Package: QFN24 (4×4 mm)
Available Modules: ESP8684-MINI-1, ESP8684-WROOM-01C, ESP8684-WROOM-02C, ESP8684-WROOM-02UC and 5 more

Security

AES: No
SHA: SHA-1/224/256
RSA / MPI: No
ECC (elliptic curves): Yes (P-192, P-256)
Hardware ECDSA: No
HMAC: No
Digital Signature (DS): No
Key Manager: No
Random Generator (TRNG): Yes (hardware TRNG)
Flash Encryption: XTS-AES-128
Secure Boot: V2 (ECDSA P-192 or P-256)
DPA Protection: No

Memory

SRAM: 272 KB (16 KB for cache)
RTC SRAM: No
ROM: 576 KB
External Flash: Up to 16 MB via QSPI, but unavailable in retail variants (ESP8684H2X/H4X have 2 MB or 4 MB in package and do not expose flash pins)
External PSRAM: No

Power consumption

Typical values at 3.3 V and 25 °C. Actual power consumption depends on radio duty cycle and configured clock frequency.

Active Cpu 120mhz: 10.7-15.6 mA (modem-sleep)
Light Sleep: 140 µA
Deep Sleep: 5 µA

Peripherals

GPIO: 14
ADC: 1x 12-bit SAR ADC, up to 5 channels
DAC: No
Touch: No
UART: 2
SPI: 3 (SPI0/1 for internal Flash, SPI2 for general use)
I2C: 1 (Master-only)
I2S: No
PWM: LED PWM (up to 6 channels)
USB: No

Special interfaces

Temperature Sensor: 1 (internal)

Temperature limits

Operating: -40°C to 105°C
Storage: -40°C to 150°C

Ready to prototype with ESP32-C2?

Explore development boards available for this series, with USB, onboard sensors, and official store links.

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