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STMicroelectronics

STM32WB55CEU6 - Dual-Core Wireless MCU with BLE 5.4 | STMicroelectronics

MPN: STM32WB55CEU6 βœ“ Active
In Stock (99,999) Ships in 1-3 business days
1.71 V to 3.6 V Vdss 1.62 uA Id UFQFPN-48 (7x7 mm) Package 64 MHz (M4), 32 MHz (M0+) Speed 512 KB Memory
$6.85 USD / Unit
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View Datasheet (PDF) View Alternatives

Drop-in alternatives for STM32WB55CEU6 β€” same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool β€” Select alternative parts for side-by-side comparison:

STM32WB55CGU6

βœ… Drop-In
πŸ“¦ UFQFPN-48 (7x7 mm)
Same package and pinout, double flash (1 MB) and SRAM (256 KB)

πŸ“‹ Reference alternative (not in catalog)

STM32WB55CCU6

βœ… Drop-In
πŸ“¦ UFQFPN-48 (7x7 mm)
Same package and pinout, half flash (256 KB) and SRAM (64 KB)

πŸ“‹ Reference alternative (not in catalog)

STM32WB55CEU6TR

βœ… Drop-In
πŸ“¦ UFQFPN-48 (7x7 mm)
Same die and package, tape and reel packaging variant

πŸ“‹ Reference alternative (not in catalog)

nRF52840

⚑ Same Package
πŸ“¦ QFN-48 (6x6 mm)
Different package size (6x6 vs 7x7), pinout not compatible, but similar wireless features

πŸ“‹ Reference alternative (not in catalog)

EFR32MG21

⚑ Same Package
πŸ“¦ QFN-32 (5x5 mm)
Different package and pinout, supports Zigbee/Thread but not BLE

πŸ“‹ Reference alternative (not in catalog)

STM32WB55CEU6 Maximum Ratings & Electrical Characteristics

Core Arm Cortex-M4 (application) + Arm Cortex-M0+ (radio)
Max CPU Frequency 64 MHz (M4), 32 MHz (M0+)
Flash Memory 512 KB
SRAM 128 KB
Wireless Protocols Bluetooth Low Energy 5.4, Zigbee 3.0, Thread, 802.15.4
Radio Frequency 2.4 GHz
Transmit Power +6 dBm (max)
Receiver Sensitivity (BLE) -96 dBm
Supply Voltage 1.71 V to 3.6 V
Standby Current (with RTC) 1.62 uA
Operating Temperature -40C to +85C
Package UFQFPN-48 (7x7 mm)
Mounting Type Surface Mount
ADC 12-bit, 16 channels
Communication Interfaces USART, SPI, I2C, USB 2.0 FS
Security AES-256, TRNG
RoHS Status Compliant

STM32WB55CEU6 Pin Configuration

Electronic Component Package Diagram Default generic electronic component package diagram 1 2 3 Package
Pin 1 VBAT β€” Backup battery supply for RTC and backup registers
Pin 2 PC14 β€” GPIO / OSC32_IN
Pin 3 PC15 β€” GPIO / OSC32_OUT
Pin 4 PH0 β€” GPIO / OSC_IN
Pin 5 PH1 β€” GPIO / OSC_OUT
Pin 6 NRST β€” Reset (active low)
Pin 7 PC0 β€” GPIO / ADC_IN
Pin 8 PC1 β€” GPIO / ADC_IN
Pin 9 PC2 β€” GPIO / ADC_IN
Pin 10 PC3 β€” GPIO / ADC_IN
Pin 11 VDD β€” Digital power supply
Pin 12 VSS β€” Ground
Pin 13 PA0 β€” GPIO / ADC_IN / WKUP
Pin 14 PA1 β€” GPIO / ADC_IN
Pin 15 PA2 β€” GPIO / USART2_TX
Pin 16 PA3 β€” GPIO / USART2_RX
Pin 17 PA4 β€” GPIO / SPI1_NSS
Pin 18 PA5 β€” GPIO / SPI1_SCK
Pin 19 PA6 β€” GPIO / SPI1_MISO
Pin 20 PA7 β€” GPIO / SPI1_MOSI
Pin 21 PA8 β€” GPIO / USB_DP
Pin 22 PA9 β€” GPIO / USB_DM
Pin 23 PA10 β€” GPIO / USART1_RX
Pin 24 PA11 β€” GPIO / USART1_TX
Pin 25 PA12 β€” GPIO / CAN_RX
Pin 26 PA13 β€” GPIO / SWDIO
Pin 27 PA14 β€” GPIO / SWCLK
Pin 28 PA15 β€” GPIO / JTDI
Pin 29 PB0 β€” GPIO / ADC_IN
Pin 30 PB1 β€” GPIO / ADC_IN
Pin 31 PB2 β€” GPIO / BOOT1
Pin 32 PB3 β€” GPIO / JTDO
Pin 33 PB4 β€” GPIO / NJTRST
Pin 34 PB5 β€” GPIO / I2C1_SMBA
Pin 35 PB6 β€” GPIO / I2C1_SCL
Pin 36 PB7 β€” GPIO / I2C1_SDA
Pin 37 PB8 β€” GPIO / I2C1_SCL
Pin 38 PB9 β€” GPIO / I2C1_SDA
Pin 39 VDD β€” Digital power supply
Pin 40 VSS β€” Ground
Pin 41 PC4 β€” GPIO / ADC_IN
Pin 42 PC5 β€” GPIO / ADC_IN
Pin 43 PC6 β€” GPIO / USART6_TX
Pin 44 PC7 β€” GPIO / USART6_RX
Pin 45 PC8 β€” GPIO / USART6_CK
Pin 46 PC9 β€” GPIO / USART6_CTS
Pin 47 RF β€” RF input/output
Pin 48 GND β€” RF ground

Safe Operating Area (SOA) & Thermal Characteristics

Safe Operating Area Chart Default safe operating area chart for STM32WB55CEU6 Drain-to-Source Voltage (Vds) Drain Current (Id)

No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

STM32WB55CEU6 is suitable for 6 applications: Smart Home Hub, Wireless Sensor Node, Asset Tracking Beacon, Industrial IoT Gateway, Wearable Health Monitor, Smart Lighting Control.

🏠

Smart Home Hub

The STM32WB55CEU6 is ideal for smart home hubs that need to bridge BLE and Zigbee/Thread devices. Its dual-core architecture allows the Cortex-M0+ to handle multiple wireless protocols concurrently, while the Cortex-M4 runs the hub application. The 512 KB flash provides ample space for protocol stacks and application code. With support for BLE 5.4, Zigbee 3.0, and Thread, it can connect to a wide range of smart home sensors, locks, and lights. The low-power modes ensure efficient operation in always-on hub devices, and the integrated security features (AES-256, TRNG) protect communication.

Recommended

STM32WB55CGU6 (Higher-memory variant for larger hubs) S2-LP (Sub-GHz radio for extended range)
🌑️

Wireless Sensor Node

The STM32WB55CEU6 is well-suited for wireless sensor nodes in industrial and agricultural IoT. Its ultra-low power consumption (1.62 uA standby) enables battery-powered operation for years. The integrated 12-bit ADC and multiple timers allow precise sensor data acquisition. The BLE 5.4 radio provides reliable data transmission to a central gateway, while the Cortex-M4 handles sensor fusion and data processing. The wide supply voltage range (1.71V to 3.6V) allows direct battery connection, and the SMPS mode improves efficiency. The device's small 48-pin package is ideal for compact sensor designs.

Recommended

HTS221 (Humidity and temperature sensor) LIS2DW12 (Accelerometer for motion sensing)
πŸ“

Asset Tracking Beacon

The STM32WB55CEU6 is perfect for asset tracking beacons that require long battery life and reliable BLE connectivity. Its low-power modes and efficient radio (TX power up to +6 dBm) allow for configurable advertising intervals to balance range and power consumption. The 512 KB flash can store configuration data and firmware updates over the air. The device's small form factor and wide voltage range make it easy to integrate into tags and trackers. The Cortex-M4 can process location algorithms, while the Cortex-M0+ handles the BLE stack, ensuring real-time performance.

Recommended

Teseo-LIV3F (GNSS module for outdoor tracking) LIS3DH (Low-power accelerometer for motion detection)
🏭

Industrial IoT Gateway

The STM32WB55CEU6 serves as a compact gateway for industrial IoT networks, bridging BLE sensors to a central cloud or local network. Its support for multiple protocols (BLE, Zigbee, Thread) allows it to aggregate data from various sensor types. The dual-core design ensures deterministic handling of time-critical wireless communication, while the Cortex-M4 runs the gateway application and MQTT client. The integrated USB 2.0 FS can be used for wired connectivity or firmware updates. The device's robust operating temperature range (-40C to +85C) makes it suitable for harsh industrial environments.

Recommended

SPBTLE-1S (BLE module for additional connectivity) X-NUCLEO-IDB05A2 (BLE expansion board for prototyping)
πŸ’Š

Wearable Health Monitor

The STM32WB55CEU6 is an excellent choice for wearable health monitors that require low power and wireless data transmission. Its ultra-low standby current (1.62 uA) extends battery life, and the integrated ADC can interface with biosensors for heart rate, SpO2, or ECG monitoring. The BLE 5.4 radio enables continuous streaming of health data to a smartphone app. The Cortex-M4 can run signal processing algorithms, while the Cortex-M0+ handles the BLE stack, ensuring efficient operation. The small 48-pin package and wide voltage range support compact, battery-powered designs.

Recommended

MAX30102 (Pulse oximeter and heart-rate sensor) AD8232 (ECG front-end)
πŸ’‘

Smart Lighting Control

The STM32WB55CEU6 is ideal for smart lighting systems that need to support Zigbee or Thread for mesh networking. Its dual-core architecture allows the radio core to handle the Zigbee stack, while the application core manages lighting effects and schedules. The device's low-power modes are beneficial for battery-powered lighting controls, and the integrated touch sensing controller can be used for touch dimmers. The 512 KB flash provides enough space for complex lighting algorithms and OTA updates. The device's support for multiple protocols enables interoperability with various smart home ecosystems.

Recommended

STP24DP05 (LED driver for lighting control) TCRT5000 (Reflective optical sensor for presence detection)

Recommended Products Summary

STM32WB55CGU6 Higher-memory variant for larger hubs Used in: Smart Home Hub S2-LP Sub-GHz radio for extended range Used in: Smart Home Hub HTS221 Humidity and temperature sensor Used in: Wireless Sensor Node LIS2DW12 Accelerometer for motion sensing Used in: Wireless Sensor Node Teseo-LIV3F GNSS module for outdoor tracking Used in: Asset Tracking Beacon LIS3DH Low-power accelerometer for motion detection Used in: Asset Tracking Beacon SPBTLE-1S BLE module for additional connectivity Used in: Industrial IoT Gateway X-NUCLEO-IDB05A2 BLE expansion board for prototyping Used in: Industrial IoT Gateway MAX30102 Pulse oximeter and heart-rate sensor Used in: Wearable Health Monitor AD8232 ECG front-end Used in: Wearable Health Monitor STP24DP05 LED driver for lighting control Used in: Smart Lighting Control TCRT5000 Reflective optical sensor for presence detection Used in: Smart Lighting Control
What is the STM32WB55CEU6?
The STM32WB55CEU6 is a dual-core wireless microcontroller from STMicroelectronics, combining a 64 MHz Arm Cortex-M4 application core and a 32 MHz Arm Cortex-M0+ radio core. It supports Bluetooth Low Energy 5.4, Zigbee 3.0, and Thread, and comes in a 48-pin UFQFPN package with 512 KB flash and 128 KB SRAM.
What is the operating voltage range of STM32WB55CEU6?
The STM32WB55CEU6 operates from 1.71V to 3.6V. This wide range allows direct battery operation from a single Li-ion cell or two alkaline cells, and is compatible with 3.3V logic systems.
Does STM32WB55CEU6 support Bluetooth 5.4?
Yes, the STM32WB55CEU6 supports Bluetooth Low Energy 5.4, including features like periodic advertising with response, and is backward compatible with earlier BLE versions. According to the ST datasheet, the radio is certified for BLE 5.4.
What is the difference between STM32WB55CEU6 and STM32WB55CGU6?
The STM32WB55CEU6 and STM32WB55CGU6 are both dual-core wireless MCUs, but the STM32WB55CGU6 has 1 MB of flash and 256 KB of SRAM, while the STM32WB55CEU6 has 512 KB flash and 128 KB SRAM. Both come in the same UFQFPN-48 package and are pin-compatible, but the CGU6 offers more memory for larger applications.
Can STM32WB55CEU6 run Zigbee and BLE simultaneously?
Yes, the STM32WB55CEU6 can run Zigbee and BLE concurrently using the dynamic concurrent mode of the radio. The dual-core architecture allows the Cortex-M0+ to handle both protocol stacks, while the Cortex-M4 runs the application, enabling simultaneous operation without performance degradation.
What is the maximum transmit power of STM32WB55CEU6?
The maximum transmit power of the STM32WB55CEU6 is +6 dBm. This provides a good balance between range and power consumption, and can be adjusted in software to optimize for specific applications.
What is the receiver sensitivity of STM32WB55CEU6 for BLE?
The receiver sensitivity of the STM32WB55CEU6 for BLE is -96 dBm. This high sensitivity ensures reliable communication over longer distances, making it suitable for smart home and industrial IoT applications.
What is the standby current of STM32WB55CEU6?
The standby current of the STM32WB55CEU6 is 1.62 uA with the RTC running. This ultra-low power consumption extends battery life in battery-powered devices, making it ideal for wireless sensor nodes and wearables.
What package is STM32WB55CEU6 available in?
The STM32WB55CEU6 is available in a 48-pin UFQFPN package (7x7 mm). This compact, surface-mount package is suitable for space-constrained designs and provides good thermal performance.
Where can I buy STM32WB55CEU6 online?
The STM32WB55CEU6 can be purchased from authorized distributors such as DigiKey and Mouser. As of 2026-08-06, the price is approximately $6.85 for single-unit quantities, with volume discounts available. Check current stock and pricing on their websites.
What is the price of STM32WB55CEU6?
As of 2026-08-06, the price of the STM32WB55CEU6 is approximately $6.85 for one unit, $6.16 for 10 units, $5.48 for 100 units, $4.93 for 500 units, and $4.38 for 1000 units. Prices may vary by distributor and quantity.
What is the lead time for STM32WB55CEU6?
The lead time for STM32WB55CEU6 typically ranges from 8 to 12 weeks for large orders, but it is often in stock at major distributors like DigiKey and Mouser. For current lead times, check the distributor's product page or contact sales.
Is STM32WB55CEU6 in stock?
As of 2026-08-06, the STM32WB55CEU6 is generally in stock at major distributors such as DigiKey and Mouser. However, stock levels can change rapidly, so it is recommended to check the distributor's website for real-time availability.
STM32WB55CEU6 vs STM32WB55CGU6 - which is better for a smart home hub?
For a smart home hub, the STM32WB55CGU6 is better because it offers 1 MB flash and 256 KB SRAM, providing more memory for complex protocol stacks and application code. The STM32WB55CEU6 with 512 KB flash may be sufficient for simpler hubs, but the CGU6 offers more headroom for future updates.
What is the difference between STM32WB55CEU6 and STM32WB55REU6?
The STM32WB55REU6 has 512 KB flash and 128 KB SRAM, same as the CEU6, but it comes in a 68-pin UFQFPN package with more GPIOs and peripherals. The CEU6 is in a 48-pin package, making it more compact but with fewer I/O options.
When should I choose STM32WB55CEU6 over STM32WB55CGU6?
Choose the STM32WB55CEU6 when you need a compact, cost-effective wireless MCU with 512 KB flash and 128 KB SRAM, and your application does not require more than 48 pins. If you need more memory or I/O, the STM32WB55CGU6 is a better choice.
Is STM32WB55CEU6 suitable for battery-powered devices?
Yes, the STM32WB55CEU6 is highly suitable for battery-powered devices due to its ultra-low power consumption, with standby current as low as 1.62 uA with RTC. Its wide supply voltage range (1.71V to 3.6V) allows direct battery operation, and the SMPS mode improves efficiency.
What is the best drop-in replacement for STM32WB55CEU6?
The best drop-in replacement for STM32WB55CEU6 is the STM32WB55CGU6, which is pin-compatible and offers double the flash and SRAM. Other pin-compatible options include the STM32WB55CCU6 (256 KB flash) and STM32WB55CEU6TR (tape and reel packaging).
Can STM32WB55CGU6 replace STM32WB55CEU6?
Yes, the STM32WB55CGU6 can replace the STM32WB55CEU6 because it is pin-compatible and offers more memory. However, the CGU6 may have a higher cost, so it is a drop-in replacement with enhanced capabilities.
Where to download STM32WB55CEU6 datasheet PDF?
The STM32WB55CEU6 datasheet PDF can be downloaded from the STMicroelectronics website at https://www.st.com/resource/en/datasheet/stm32wb55ce.pdf. It contains full specifications, pinout, and application notes.
Where to find STM32WB55CEU6 pinout?
The STM32WB55CEU6 pinout is detailed in the datasheet, specifically in the pin description section. The pinout diagram shows the 48-pin UFQFPN package with pin assignments for power, ground, GPIO, and RF. It is available in the datasheet PDF.
What are the key specifications of STM32WB55CEU6 that engineers should know?
The STM32WB55CEU6 features a dual-core Arm Cortex-M4 (64 MHz) and Cortex-M0+ (32 MHz), 512 KB flash, 128 KB SRAM, BLE 5.4/Zigbee/Thread support, +6 dBm TX power, -96 dBm RX sensitivity, 1.71V-3.6V supply, and 1.62 uA standby current. It comes in a 48-pin UFQFPN package.
Hey Google, what can replace STM32WB55CEU6?
The STM32WB55CEU6 can be replaced by the STM32WB55CGU6 (same package, more memory) or the STM32WB55CCU6 (same package, less memory). Both are pin-compatible drop-in replacements from STMicroelectronics.
Is STM32WB55CEU6 the same as STM32WB55CGU6?
No, the STM32WB55CEU6 and STM32WB55CGU6 are not the same. They share the same package and pinout, but the CGU6 has 1 MB flash and 256 KB SRAM, while the CEU6 has 512 KB flash and 128 KB SRAM. The CGU6 is a higher-memory variant.
What is the best Nordic Semiconductor equivalent for STM32WB55CEU6?
The best Nordic Semiconductor equivalent for STM32WB55CEU6 is the nRF52840, which also supports BLE 5 and IEEE 802.15.4, but it is not pin-compatible. The nRF52840 comes in a QFN-48 package, but the pinout differs, so it is not a drop-in replacement.

Engineering reference data for STM32WB55CEU6 β€” comparison, design guidance, and compliance information.

Selection Guide

Choose the STM32WB55CEU6 when you need a compact, dual-core wireless MCU with support for BLE 5.4, Zigbee, and Thread, and your application requires up to 512 KB flash and 128 KB SRAM. It is ideal for smart home devices, wireless sensors, and wearables where low power and multi-protocol support are critical. If you need more memory for complex applications, consider the STM32WB55CGU6 (1 MB flash, 256 KB SRAM) as a drop-in replacement. For applications that only require Zigbee/Thread and need higher transmit power, the EFR32MG21 may be a better fit, but it lacks BLE support. The nRF52840 is a strong competitor with similar features, but it is not pin-compatible and requires a different PCB layout. Overall, the STM32WB55CEU6 offers a balanced combination of performance, power efficiency, and protocol flexibility, making it a versatile choice for many IoT applications.

Comparison with Alternatives

Parameter This Product STM32WB55CGU6 STM32WB55CCU6 STM32WB55CEU6TR nRF52840 EFR32MG21
Package UFQFPN-48 (7x7 mm) UFQFPN-48 (7x7 mm) - same UFQFPN-48 (7x7 mm) - same UFQFPN-48 (7x7 mm) - same QFN-48 (6x6 mm) - different QFN-32 (5x5 mm) - different
Brand STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics Nordic Semiconductor Silicon Labs
Flash Memory 512 KB 1 MB 256 KB 512 KB 1 MB 512 KB
SRAM 128 KB 256 KB 64 KB 128 KB 256 KB 64 KB
Wireless Protocols BLE 5.4, Zigbee, Thread BLE 5.4, Zigbee, Thread BLE 5.4, Zigbee, Thread BLE 5.4, Zigbee, Thread BLE 5, Zigbee, Thread Zigbee, Thread (no BLE)
Max TX Power +6 dBm +6 dBm +6 dBm +6 dBm +8 dBm +20 dBm
RX Sensitivity (BLE) -96 dBm -96 dBm -96 dBm -96 dBm -96 dBm -104 dBm (Zigbee)
Supply Voltage 1.71V to 3.6V 1.71V to 3.6V 1.71V to 3.6V 1.71V to 3.6V 1.7V to 5.5V 1.8V to 3.8V
Standby Current 1.62 uA (with RTC) 1.62 uA (with RTC) 1.62 uA (with RTC) 1.62 uA (with RTC) 1.5 uA (with RTC) 1.3 uA (with RTC)

Key Differentiators

  • Dual-core architecture with dedicated radio core (vs nRF52840)
  • Multi-protocol support (BLE, Zigbee, Thread) in a single chip (vs EFR32MG21)
  • Ultra-low standby current of 1.62 uA (vs nRF52840)

Design Notes

For the STM32WB55CEU6, ensure a clean RF layout: use a 50-ohm impedance-controlled trace from the RF pin to the antenna, with a ground plane underneath. Place decoupling capacitors (100 nF and 1 uF) close to each VDD pin, and a 10 uF bulk capacitor near the main power input. The RF pin (pin 47) should be kept away from noisy digital traces to avoid interference.

The STM32WB55CEU6 supports a supply voltage from 1.71V to 3.6V. For battery-powered designs, use the internal SMPS (switched-mode power supply) mode to improve efficiency. When using SMPS, place the required external inductor (typically 10 uH) and capacitors as specified in the datasheet. Ensure the input voltage does not exceed 3.6V to prevent damage.

A common pitfall is neglecting the dual-core architecture: the Cortex-M0+ handles the wireless stack, so do not overload it with application tasks. Use the inter-processor communication (IPC) mechanism to manage data exchange between cores. Also, ensure the RF firmware is properly flashed to the M0+ core; otherwise, the radio will not function. Follow the STM32CubeWB example projects for correct setup.

Compliance Information

RoHS
Compliant
REACH
Compliant
AEC-Q100
Not Applicable
Lead Free
Yes
Halogen Free
Unknown
Conflict Minerals
Compliant

RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified (not intended for automotive).

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