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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsThe ESP32-H2-WROOM-07 is an unusually compact Espressif radio module for products that need Bluetooth Low Energy (BLE) and 2.4 GHz IEEE 802.15.4 connectivity. Its headline advantage is its approximately 8.5 × 12.7 × 2.6 mm footprint; its main trade-off is that the module exposes only three GPIOs, even though the ESP32-H2 chip itself supports up to 19.
What the ESP32-H2-WROOM-07 is
Espressif’s ESP32-H2-WROOM-07 combines an ESP32-H2 single-core, 32-bit RISC-V system-on-chip (SoC) with in-package flash, a 32 MHz crystal oscillator and an integrated monopole antenna. It is designed for compact connected devices, rather than as a general-purpose Wi-Fi module: its wireless interfaces are Bluetooth LE and IEEE 802.15.4.
The module specification lists 2 MB or 4 MB of in-package flash. Confirm the precise ordering code and flash variant before choosing parts or laying out a production board; the ESP32-H2-WROOM-07-H2 and -H4 codes identify different variants.
How small it is—and what that means for a board
Espressif’s 2024 ESP32-H2-WROOM-07 Datasheet v1.0 gives the module envelope as approximately 8.5 mm × 12.7 mm × 2.6 mm. That small footprint can help reduce board area in compact sensors, trackers and controls.
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- ESP32--32D, Core: ESP32-D0WD ; SPI flash: 32 Mbits, 3.3 V; Crysta: 40 MHz; Antenna: onboard antenna.
- ESP32--32D are powerful, generic Wi-Fi+BT+BLE MCU modules that target a wide variety of applications, ranging from low-power sensor networks to the most demanding tasks, such as voice encoding, music streaming and MP3 decoding.
- The sleep current of the ESP32 chip is less than 5 µA, making it suitable for battery powered and wearable electronics applications.
- ESP32--32D integrate a 4 MB of external SPI flash. The integrated SPI flash is connected to GPIO6, GPIO7, GPIO8, GPIO9, GPIO10 and GPIO11. These six pins cannot be used as regular GPIOs.
- Flash integrated on the module and are not recommended for other uses.
Integration does not eliminate board-design constraints. The built-in antenna needs appropriate clearance, and the compact module leaves limited room for routing and expansion. Follow Espressif’s module guidance for land pattern, placement, soldering and handling; account for antenna keep-out, grounding, power integrity and programming access in the carrier-board design.
Bluetooth LE, Thread, Zigbee and Matter support
The ESP32-H2 family supports Bluetooth 5.3 LE and IEEE 802.15.4. Espressif’s current ESP32-H2 Series Datasheet v1.3 lists Bluetooth mesh, LE coded-PHY modes at 125 Kbps and 500 Kbps, 2 Mbps LE operation, advertising extensions and multiple advertising sets. It also lists simultaneous broadcaster, observer, central and peripheral roles, multiple connections and LE power control.
On the 802.15.4 side, the family documentation specifies IEEE 802.15.4-2015 compliance and a 2.4 GHz O-QPSK physical layer at 250 Kbps. Espressif lists Thread 1.4, Zigbee 3.0 and Matter among its supported protocol options, as well as application layers such as HomeKit and MQTT. These are platform capabilities; the firmware, application and network design still determine which protocol a finished product uses.
Thread end devices and Wi-Fi-based gateway roles
The module can be used in a Thread end device. Espressif describes Thread border-router and Matter-bridge designs as combining the ESP32-H2 with an ESP Wi-Fi SoC. The WROOM-07 alone is not a Wi-Fi radio, so those gateway or bridge roles require the additional Wi-Fi-capable component and appropriate system software.
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- ESP32-WROOM-32E and ESP32-WROOM-32UE are two powerful, generic Wi-Fi+BT+BLE MCU modules that target a wide variety of applications, ranging from low-power sensor networks to the most demanding tasks, such as voice encoding, music streaming and MP3 decoding.
- ESP32-WROOM-32E comes with a PCB antenna, and ESP32-WROOM-32UE with an IPEX antenna. They both feature a 4 MB external SPI flash. T
- At the core of the module is the ESP32-D0WD-V3 chip*. The chip embedded is designed to be scalable and adaptive.
- There are two CPU cores that can be individually controlled, and the CPU clock frequency is adjustable from 80 MHz to 240 MHz.
- The chip also has a low-power co-processor that can be used instead of the CPU to save power while performing tasks that do not require much computing power, such as monitoring of peripherals. ESP32 integrates a rich set of peripherals, ranging from capacitive touch sensors, Hall sensors, SD card interface, Ethernet, high-speed SPI, UART, I²S and I²C.
What the module exposes versus what the chip supports
A key design distinction is that the ESP32-H2 SoC’s capabilities are not all directly available as pins on this module. Espressif’s 2026 ESP32-H2 family page lists up to 19 programmable GPIOs at the SoC level, while the WROOM-07 module specification exposes three GPIOs. That makes the module’s pin count, rather than the full chip peripheral list, the practical constraint when connecting sensors, controls or other devices.
At the SoC level, the platform includes UART, SPI, I2C, I2S, remote-control, LED PWM, full-speed USB Serial/JTAG, GDMA and MCPWM, along with ADC and other timing and control peripherals. A particular design must check which functions can be assigned to the module’s exposed pins. Pin multiplexing and a suitable carrier-board strategy may be necessary.
Processing, memory, voltage and sleep current
Espressif’s 2026 ESP32-H2 family page specifies a single-core RISC-V processor running at up to 96 MHz, with 320 KB SRAM, 128 KB ROM and 4 KB of low-power memory. These are SoC-family specifications; the WROOM-07’s module-specific flash options are the 2 MB and 4 MB variants listed in its module specification.
The WROOM-07 module is specified for a 3.0–3.6 V supply and an operating temperature range of –40 to 105 °C. Espressif’s current family datasheet lists 7 µA deep-sleep consumption for the ESP32-H2 SoC. That figure is not a guaranteed current for a complete WROOM-07 product: the regulator, flash, connected sensors, RF state and board leakage all affect system-level consumption.
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- 🔥【Dual Mode & High Performance】 The ESP32-S3 development board features integrated dual-core xtensa 32-bit LX7 microprocessor, clock speed up to 240 MHz, with 16MB Flash and 8 MB PSRAM. Perfect for Arduino IoT projects requiring stable wireless communication with ultra-low power consumption.
- 🔧【Easy Programming & Debugging】 Equipped with dual USB Type-C ports, this ESP32-S3 board supports both USB and UART modes for effortless programming, firmware flashing, and debugging.
- 🌐【Versatile Wireless Connectivity】 Built-in Wi-Fi (2.4GHz) and Bluetooth 5.0 (LE) dual-mode ensure seamless connectivity with a wide range of smart devices, making it ideal for IoT, smart homes projects.
- 🚀【Flexible Download Options】 Supports dual download methods — USB direct download or USB-to-serial download — offering flexibility and convenience for different development needs.Ideal for beginners and developers working with ESP32-S3.
- 🔋【Advanced Power-Saving Modes】 Designed for energy-efficient applications, with 3.3V SPI voltage, the ESP32-S3 board supports multiple low-power modes, allowing you to extend battery life based on different usage scenarios.
When the WROOM-07 is a good fit
Consider it when
- Board area is a priority and the approximately 8.5 × 12.7 mm module envelope suits the design.
- The product needs BLE plus an 802.15.4 protocol such as Thread or Zigbee, or a Matter implementation based on the ESP32-H2 platform.
- The required external connections can be served by the module’s three exposed GPIOs, with its available pin functions checked against the design.
Look beyond it when
- The design needs many direct GPIO connections or easy access to a broad set of the SoC’s peripherals.
- The product needs Wi-Fi from the module itself; the WROOM-07 is a BLE and 802.15.4 module, and Wi-Fi-based gateway designs need a separate ESP Wi-Fi SoC.
- The application requires a different antenna arrangement. The WROOM-07 integrates a monopole antenna, while other ESP32-H2 module choices may use a PCB antenna or an external-antenna connector.
Choosing among ESP32-H2 module options
Compare candidate modules by the constraints that affect the finished board, not just by the shared ESP32-H2 name. The family SoC’s capabilities do not establish the exposed pins, dimensions or antenna arrangement of each module.
| Decision point | ESP32-H2-WROOM-07 | What to verify on another module |
|---|---|---|
| Envelope | Approximately 8.5 × 12.7 × 2.6 mm, per Espressif’s 2024 module datasheet. | Module dimensions and required PCB land pattern. |
| Antenna | Integrated monopole antenna. | Whether it uses an integrated or PCB antenna, or an external-antenna connector, and what clearance it requires. |
| Exposed I/O | Three GPIOs listed for the module. | Actual module pinout; the SoC’s up-to-19-GPIO figure does not mean all pins are exposed on every module. |
| Flash variant | 2 MB or 4 MB in-package flash; check the full ordering code. | Flash capacity and exact suffix for the orderable variant. |
If the application needs BLE only, an 802.15.4-capable part may be more than it requires. If it needs Thread, Zigbee or Matter support on the ESP32-H2 platform, the radio capability is relevant, but the specific module’s I/O, antenna and flash details still need to fit the board and firmware.
Buying and prototyping considerations
Espressif’s module catalog provides a purchasing and minimum-order-quantity pathway, and commercial listings also use the ESP32-H2-WROOM-07 name. No current price, seller, stock level or minimum order quantity is established here, so check the live listing and confirm the exact -H2 or -H4 ordering code before ordering.
For a prototype, determine how the module will be mounted and programmed, and provide a regulated supply within its specified voltage range. A carrier PCB or custom board may be needed to make the exposed pins, power and programming connections accessible; do not assume a particular development board is compatible without checking its module footprint and pinout.
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