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-H2

Focused on ultra-low power with Bluetooth 6.0, Zigbee and Thread. No Wi-Fi support

Official datasheet Programming guide Technical reference manual

Processor: Single-core; Up to 96 MHz
SRAM: 320 KB; + 4 KB (LP Memory) RTC SRAM
GPIO: 19; programmable pins
Architecture: RISC-V; RISC-V single-core 32-bit

Official development kit

Official Espressif board for the ESP32-H2 series.

Pins with usage restrictions

Not every pin on the ESP32-H2 is free for general-purpose use. 12 of them have conditions: occupied by memory, sampled during boot, or function as input only. Check before finalizing your schematic.

Strapping pins (boot mode)

3 pins

GPIO8
GPIO9
GPIO25 · GPIO24

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

6 pins

MTMS · GPIO1
MTDO · GPIO3
MTCK · GPIO4
MTDI · GPIO5
U0RXD · GPIO23
U0TXD · GPIO24

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.

Native USB

2 pins

GPIO26
GPIO27

Connected by default to the internal USB Serial/JTAG controller. Using them as GPIO requires disabling this peripheral, which also removes direct USB flashing.

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 96 MHz
ULP Coprocessor: No
AI Accelerators: No

Connectivity

Wi-Fi: No
Bluetooth: Bluetooth 5 (LE) (Bluetooth 5.3 certified)
Zigbee/Thread: IEEE 802.15.4 (Zigbee 3.0, Thread 1.4)
Matter: Yes
Ethernet: No
CAN: No

Tools and availability

Minimum ESP-IDF: v5.1
Arduino Core: Yes (3 board definitions in official core)
Debugging: Integrated JTAG via USB (no external probe required)
Package: QFN32 (4×4 mm)
Available Modules: ESP32-H2-MINI-1, ESP32-H2-WROOM-02C

Security

AES: AES-128/256
SHA: SHA-1/224/256
RSA / MPI: Yes (RSA/MPI up to 3072 bits)
ECC (elliptic curves): Yes (P-192, P-256)
Hardware ECDSA: Yes (deterministic mode, RFC 6979)
HMAC: Yes
Digital Signature (DS): Yes
Key Manager: No
Random Generator (TRNG): Yes (hardware TRNG)
Flash Encryption: XTS-AES-128
Secure Boot: V2 (RSA-3072 or ECDSA)
DPA Protection: Yes

Memory

SRAM: 320 KB
RTC SRAM: 4 KB (LP Memory)
ROM: 128 KB
External Flash: Up to 16 MB via QSPI
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 Mode: 24-140 mA (radio, from -24 to 20 dBm)
Light Sleep: 25-85 µA
Deep Sleep: 7 µA

Peripherals

GPIO: 19
ADC: 1x 12-bit SAR ADC, up to 5 channels
DAC: No
Touch: No
UART: 2
SPI: 3
I2C: 2
I2S: 1
PWM: LED PWM (up to 6 channels)
USB: 1 (USB Serial/JTAG)

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-H2?

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

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