The ESP32-WROOM-32UE is a general-purpose Wi-Fi + Bluetooth + Bluetooth LE MCU module from Espressif Systems, built around the ESP32-D0WD-V3 chip. This version features 4MB (32Mbit) of SPI flash and an external U.FL/IPEX antenna connector, making it the preferred choice for products housed in metal enclosures or any deployment where an onboard PCB antenna would be blocked or severely attenuated .
At the core of the module is a dual-core Xtensa 32-bit LX6 microprocessor running at up to 240 MHz. The two CPU cores can be individually controlled, and a low-power co-processor can monitor peripherals while the main cores are powered down — ideal for balancing performance and power consumption . The chip‘s sleep current is below 5 µA, making it suitable for battery-powered wearable electronics and low-power sensor networks.
The module supports Wi-Fi 802.11 b/g/n with data rates up to 150 Mbps and Bluetooth v4.2 BR/EDR + BLE. Antenna output power reaches up to 20 dBm, ensuring maximum wireless range when paired with a suitable external antenna . The compact form factor (18.0 × 19.2 × 3.2 mm) is smaller than the 32E variant due to the absence of the onboard antenna .
The ESP32-WROOM-32UE integrates a rich set of peripheral interfaces including SD card, UART, SPI, SDIO, I2C, LED PWM, motor PWM, I2S, IR, pulse counter, GPIO, capacitive touch sensor, ADC, DAC, and TWAI® (compatible with ISO 11898-1, i.e., CAN Specification 2.0) . It operates from 3.0 to 3.6 V with an operating temperature range of -40°C to +85°C . The module carries BQB Bluetooth certification, FCC/CE-RED/SRRC/IC/ANATEL RF certifications, and REACH/RoHS environmental compliance .
Product Status Note: The ESP32-WROOM-32UE is the current recommended replacement for the NRND (Not Recommended for New Designs) ESP32-WROOM-32U series. It uses the updated ESP32-D0WD-V3 chip and continues to receive manufacturing support . Espressif’s Longevity Commitment guarantees ESP32 series availability through January 1, 2031 .
Development support is extensive, with official support for Espressif‘s ESP-IDF and the Arduino IDE through the Arduino-ESP32 core. The module is suitable for both individual makers and businesses purchasing for product development, smart home devices, industrial automation, and general-purpose IoT applications.
Features
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External U.FL/IPEX antenna connector — Ideal for metal enclosures and maximum-range applications
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ESP32-D0WD-V3 dual-core processor — Xtensa 32-bit LX6, up to 240 MHz, with adjustable frequency
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4MB SPI Flash — Standard storage for firmware and data
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Integrated wireless — Wi-Fi 802.11 b/g/n (up to 150 Mbps) and Bluetooth v4.2 BR/EDR + BLE
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Ultra-low sleep current — Below 5 µA for battery-powered applications
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Rich peripheral set — SD card, UART, SPI, I2C, I2S, PWM, ADC, DAC, capacitive touch, TWAI® (CAN-compatible)
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Up to 26 GPIOs — Including 5 strapping pins
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Certified — BQB, FCC/CE-RED/SRRC/IC/ANATEL, and REACH/RoHS certified for international markets
Technical Specifications
Usage
Getting Started
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Install the development environment — Install Arduino IDE with ESP32 board support, or set up ESP-IDF. Add the ESP32 board manager URL: https://espressif.github.io/arduino-esp32/package_esp32_index.json.
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Connect an external antenna — Attach a 2.4 GHz U.FL/IPEX antenna to the module’s connector. Ensure the connector is fully seated for optimal signal integrity.
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Connect the module — Use a USB-to-UART adapter (3.3V logic) connected to TX, RX, GND, and EN pins. The bare module requires an external 3.3V power supply.
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Upload your sketch — Select the correct board (e.g., “ESP32 Dev Module”) and port. If uploading fails, hold the BOOT button (GPIO0 to GND) during the “Connecting…” phase.
Important Pin Note
GPIO6–GPIO11 are occupied by the built-in flash and are not available for external use. On modules with embedded PSRAM, GPIO16 is used for PSRAM connection .
Typical Applications
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Metal enclosure products — External antenna solves RF blocking issues
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Industrial IoT gateways — Reliable wireless communication in factories and warehouses
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Smart home devices — Connected appliances, lighting, and sensors
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Remote monitoring systems — Sensor networks with extended wireless range
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Battery-powered applications — Ultra-low sleep current extends operational life
Notes for Business Buyers
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Current recommended version — The WROOM-32UE is the actively recommended generation, replacing the NRND WROOM-32U series
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Antenna flexibility — U.FL connector allows use of specialized antennas for range or enclosure requirements
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Certified — BQB, FCC/CE-RED/SRRC/IC/ANATEL, and REACH/RoHS certified, simplifying international market access
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Longevity Commitment — ESP32 series availability guaranteed through January 1, 2031
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Suitable for bulk purchasing — Ideal for industrial IoT, product development, and applications requiring reliable RF performance
Q: What is the ESP32-WROOM-32UE module used for?
It is a Wi-Fi and Bluetooth MCU module with an external antenna connector, designed for applications where the module is placed inside a metal enclosure or where an onboard PCB antenna cannot provide sufficient range .
Q: What is the difference between the ESP32-WROOM-32E and ESP32-WROOM-32UE?
The 32E uses an onboard PCB antenna. The 32UE uses a U.FL/IPEX connector for an external antenna, making it suitable for metal enclosures and maximum-range applications .
Q: How much flash memory does this version have?
This version includes 4 MB (32 Mbit) of SPI flash. The WROOM-32UE series is also available with 8MB and 16MB flash options .
Q: What antenna should I use with this module?
Use a 2.4 GHz U.FL/IPEX antenna. For best performance, select an antenna matched to your application‘s range and enclosure requirements.
Q: What is the operating voltage?
The module operates from 3.0 to 3.6 V, with 3.3 V being the typical supply .
Q: Does it support low-power modes?
Yes. The chip’s sleep current is below 5 µA, making it suitable for battery-powered wearable electronics and sensor nodes.
Q: What communication interfaces are available?
The module provides UART, SPI, I2C, I2S, SDIO, PWM, ADC, DAC, capacitive touch, and TWAI® (CAN-compatible) .
Q: Is the ESP32-WROOM-32UE recommended for new designs?
Yes. The WROOM-32UE is the current recommended generation, replacing the NRND WROOM-32U series .
Q: What certifications does this module have?
It carries BQB Bluetooth certification, FCC/CE-RED/SRRC/IC/ANATEL RF certifications, and REACH/RoHS environmental compliance .
Q: Can I purchase in bulk for a product development project?
Yes. The module is suitable for both individual users and business purchasing. Espressif‘s Longevity Commitment guarantees ESP32 series availability through January 1, 2031, making it a reliable choice for long-term product development .
