ESP32-WROOM-32 vs ESP32-WROOM-32E: Module Comparison and Key Differences

ElecSuppliers Part Number ComparisonAug 16, 2026

ESP32-WROOM-32 and ESP32-WROOM-32E are two widely used ESP32-based wireless modules for IoT, embedded systems, smart devices, and connected electronics. Their similar model names can make it difficult to determine which module is more appropriate for a new design or an existing product.

Both modules integrate an ESP32-based system with Wi-Fi and Bluetooth connectivity, while differences in module generation, specifications, certification information, and hardware implementation should be considered during product development.

ESP32-WROOM-32 vs ESP32-WROOM-32E

ESP32-WROOM-32 is one of the original widely adopted ESP32 modules, while ESP32-WROOM-32E is a later module variant based on the ESP32 series.

Both are designed to simplify the development of wireless embedded products by integrating the ESP32 chip, RF components, crystal oscillator, antenna solution, and other supporting components into a compact module.

For engineers evaluating these modules, the comparison should focus on the exact module revision, wireless requirements, memory configuration, antenna implementation, power supply, GPIO requirements, and certification requirements.

ESP32 Processor and Wireless Connectivity

Both ESP32-WROOM-32 and ESP32-WROOM-32E are based on the ESP32 platform.

The ESP32 architecture provides integrated wireless connectivity, making these modules suitable for applications that need both processing and network communication without adding a separate Wi-Fi or Bluetooth controller.

Typical wireless functions include:

Wi-Fi connectivity

Bluetooth

Bluetooth Low Energy

The integrated wireless architecture makes the modules suitable for connected products such as smart home devices, industrial IoT equipment, sensors, gateways, controllers, and consumer electronics.

Dual-Core Processing

ESP32 modules are designed around a dual-core Xtensa processor architecture, providing significantly more processing capability than many basic microcontrollers.

The available processing resources can be used for application logic, wireless communication, sensor processing, device control, and other embedded functions.

For an IoT product, this means the same module can handle both the main application and wireless communication tasks.

However, actual performance depends on firmware architecture, wireless workload, memory usage, and peripheral requirements.

Memory Configuration

Memory is an important consideration when comparing ESP32-WROOM-32 and ESP32-WROOM-32E.

The exact memory configuration should be checked against the specific module ordering information because ESP32 module variants can be available with different flash configurations.

Engineers should consider:

Flash capacity

Available RAM

Firmware size

Wireless protocol requirements

Application data storage

OTA update requirements

If the product requires OTA firmware updates, extensive networking functions, graphical interfaces, or larger application software, memory capacity should be reviewed carefully during module selection.

GPIO and Peripheral Integration

ESP32-based modules provide a broad range of interfaces for connecting external components.

Depending on the specific configuration and selected pins, applications can use interfaces such as:

GPIO

SPI

I2C

UART

PWM

ADC

DAC

I2S

These interfaces allow ESP32 modules to connect with sensors, displays, motors, storage devices, communication peripherals, and other electronic components.

When migrating an existing ESP32 design, engineers should verify the exact GPIO assignments because some pins may have special boot, flash, or peripheral functions.

Antenna and RF Design

Wireless performance is another important area to consider.

ESP32-WROOM modules integrate an antenna solution designed to simplify RF implementation. Depending on the module version, antenna and RF implementation details should be reviewed carefully.

When designing the PCB, engineers should pay attention to:

Antenna clearance

PCB layout

Ground plane

Nearby metal components

Enclosure materials

RF interference

Incorrect PCB implementation can reduce wireless performance even when the module itself provides the required wireless capabilities.

ESP32-WROOM-32 Applications

ESP32-WROOM-32 has been widely used in connected embedded products.

Typical applications include:

Smart home devices

IoT sensors

Industrial monitoring

Wireless controllers

Smart appliances

Environmental monitoring

Consumer electronics

IoT gateways

Its combination of processing capability and integrated wireless connectivity makes it useful for products that need a relatively compact connected controller.

ESP32-WROOM-32E Applications

ESP32-WROOM-32E can be considered for similar IoT and embedded applications.

Potential applications include:

Industrial IoT

Smart home equipment

Wireless sensors

Connected control systems

Automation equipment

Energy monitoring

Consumer devices

Embedded gateways

For a new design, engineers should evaluate ESP32-WROOM-32E according to current design requirements rather than selecting a module simply because its model number resembles an existing ESP32-WROOM-32 implementation.

ESP32-WROOM-32 Replacement Considerations

When replacing an ESP32-WROOM-32 with ESP32-WROOM-32E, engineers should review both hardware and software.

The hardware review should include:

Module dimensions

Pin assignment

Power supply

GPIO functions

Antenna layout

PCB footprint

RF clearance

External interfaces

The software review should include:

ESP-IDF version

Firmware compatibility

GPIO configuration

Peripheral drivers

Wireless configuration

Boot configuration

Flash layout

OTA update mechanism

A module replacement should therefore be tested using the actual application firmware rather than assuming complete compatibility based only on the ESP32 family name.

ESP32-WROOM-32 vs ESP32-WROOM-32E for New Designs

For a new IoT product, the selection should be based on the required wireless functions, memory, module availability, software environment, certification requirements, PCB design, and long-term supply considerations.

ESP32-WROOM-32 may be attractive for projects based on an established design and existing firmware.

ESP32-WROOM-32E can be considered when developing a new design or evaluating a newer module variant within the ESP32 ecosystem.

The final choice should be based on the exact module specifications and requirements of the target application.

Key Differences to Check

The model number alone does not provide enough information to determine whether ESP32-WROOM-32 and ESP32-WROOM-32E can be used interchangeably.

Engineers should compare:

Module revision

Flash configuration

Pin assignment

Module dimensions

Antenna design

RF characteristics

Power requirements

GPIO functions

Wireless features

Certification

Software support

Development environment

These factors can affect both hardware design and firmware migration.

ESP32-WROOM-32 vs ESP32-WROOM-32E

ESP32-WROOM-32 and ESP32-WROOM-32E belong to the same broader ESP32 wireless module ecosystem and target many similar IoT and embedded applications.

The main consideration is not simply which module has the more advanced model name, but whether the selected module meets the requirements of the complete product.

For existing designs, engineers should verify PCB compatibility, GPIO functions, firmware behavior, RF performance, and power requirements before changing modules.

For new IoT projects, ESP32-WROOM-32E can be evaluated alongside other ESP32 module options according to memory, wireless connectivity, software requirements, PCB constraints, and long-term product requirements.