STM32WB35CEU6 - 2.4GHz Wireless MCU with BLE 5.4 | STMicroelectronics
MPN: STM32WB35CEU6 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.68 | $2,340.00 |
| 1,000 | $4.16 | $4,160.00 |
STM32WB35CEU6 Overview
A wireless MCU is a microcontroller that combines a general-purpose processing core with a radio transceiver on a single chip, enabling wireless communication without external RF components. The STM32WB35CEU6 belongs to the STM32WB series, which is part of the broader STM32 family of 32-bit Arm Cortex-M microcontrollers. This integration reduces system cost, board space, and design complexity compared to discrete MCU-plus-radio solutions.
Key features include 512 KB of flash memory and 128 KB of SRAM, providing ample space for application code and data. The device operates from 1.71V to 3.6V supply voltage and supports an extended temperature range of -40°C to +85°C. It includes a rich set of peripherals: 12-bit ADC, multiple timers, USART, SPI, I2C, and a USB 2.0 FS interface. The radio subsystem delivers +6 dBm output power and -96 dBm sensitivity for BLE, ensuring reliable wireless links.
The dual-core architecture allows the Cortex-M0+ to handle the radio stack independently, offloading the main Cortex-M4 core for application processing. This separation improves real-time performance and reduces power consumption. The device also features a TrustZone-compatible secure enclave (via STM32CubeWB firmware) for secure key storage and authentication, enhancing IoT security.
Typical applications include smart home devices (sensors, locks, lighting), industrial wireless sensor networks, healthcare wearables, and asset tracking. The integrated radio and rich peripherals enable compact, low-power designs. For example, in a smart thermostat, the STM32WB35CEU6 can manage temperature sensing, display control, and BLE communication with a smartphone app.
When designing with this device, pay attention to antenna matching and PCB layout for optimal RF performance. Use the reference design from ST's application notes (e.g., AN5185) for the balun and antenna. Also, ensure proper decoupling of the supply pins and follow the recommended power sequencing to avoid latch-up.
Drop-in alternatives for STM32WB35CEU6 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STM32WB35CEU6 (same form factor and footprint) — differing in Operating Temperature, Wireless Protocols.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
STM32WB55CEU6
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.38 / Unit
View Datasheet →STM32WB35CCU6
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
STM32WB35CEU7
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
STM32WB35CEU6 Maximum Ratings & Electrical Characteristics
| Core Processor | Arm Cortex-M4 (application) + Cortex-M0+ (radio) |
| Core Frequency | 64 MHz (M4), 32 MHz (M0+) |
| Flash Memory | 512 KB |
| SRAM | 128 KB |
| Wireless Protocols | Bluetooth Low Energy 5.4, 802.15.4 (Zigbee, Thread) |
| RF Output Power | +6 dBm |
| RF Sensitivity (BLE) | -96 dBm |
| Supply Voltage | 1.71 V to 3.6 V |
| Operating Temperature | -40°C to +85°C |
| Package | UFQFPN-48 (7x7 mm) |
| Mounting Type | Surface Mount |
| ADC | 12-bit, 16 channels |
| Communication Interfaces | USART, SPI, I2C, USB 2.0 FS |
| Timers | Advanced, general-purpose, basic |
| RoHS Status | Compliant |
STM32WB35CEU6 Pin Configuration
| Pin 1 | VBAT — Battery backup supply for RTC and backup registers |
| Pin 2 | PC14 — GPIO / OSC32_IN |
| Pin 3 | PC15 — GPIO / OSC32_OUT |
| Pin 4 | VSS — Ground |
| Pin 5 | VDD — Digital power supply |
| Pin 6 | PH0 — GPIO / OSC_IN |
| Pin 7 | PH1 — GPIO / OSC_OUT |
| Pin 8 | NRST — Reset (active low) |
| Pin 9 | PC0 — GPIO / ADC input |
| Pin 10 | PC1 — GPIO / ADC input |
| Pin 11 | PC2 — GPIO / ADC input |
| Pin 12 | PC3 — GPIO / ADC input |
| Pin 13 | VSSA — Analog ground |
| Pin 14 | VDDA — Analog power supply |
| Pin 15 | PA0 — GPIO / ADC / WKUP |
| Pin 16 | PA1 — GPIO / ADC |
| Pin 17 | PA2 — GPIO / USART2_TX |
| Pin 18 | PA3 — GPIO / USART2_RX |
| Pin 19 | PA4 — GPIO / SPI1_NSS |
| Pin 20 | PA5 — GPIO / SPI1_SCK |
| Pin 21 | PA6 — GPIO / SPI1_MISO |
| Pin 22 | PA7 — GPIO / SPI1_MOSI |
| Pin 23 | PA8 — GPIO / USB_DP |
| Pin 24 | PA9 — GPIO / USB_DM |
| Pin 25 | PA10 — GPIO / USART1_RX |
| Pin 26 | PA11 — GPIO / USART1_TX |
| Pin 27 | PA12 — GPIO / SPI2_NSS |
| Pin 28 | PA13 — GPIO / SWDIO |
| Pin 29 | PA14 — GPIO / SWCLK |
| Pin 30 | PA15 — GPIO / SPI2_SCK |
| Pin 31 | PB0 — GPIO / ADC |
| Pin 32 | PB1 — GPIO / ADC |
| Pin 33 | PB2 — GPIO / SPI2_MISO |
| Pin 34 | PB3 — GPIO / SPI2_MOSI |
| Pin 35 | PB4 — GPIO / I2C1_SCL |
| Pin 36 | PB5 — GPIO / I2C1_SDA |
| Pin 37 | PB6 — GPIO / USART3_TX |
| Pin 38 | PB7 — GPIO / USART3_RX |
| Pin 39 | PB8 — GPIO / I2C2_SCL |
| Pin 40 | PB9 — GPIO / I2C2_SDA |
| Pin 41 | VDD — Digital power supply |
| Pin 42 | VSS — Ground |
| Pin 43 | RF — RF input/output |
| Pin 44 | VDD_RF — RF power supply |
| Pin 45 | VSS_RF — RF ground |
| Pin 46 | PC4 — GPIO / ADC |
| Pin 47 | PC5 — GPIO / ADC |
| Pin 48 | PC6 — GPIO / TIM3_CH1 |
Typical Applications
STM32WB35CEU6 is suitable for 6 applications: Smart Home Devices, Industrial Wireless Sensor Networks, Healthcare Wearables, Asset Tracking, Smart Agriculture, Smart Lighting.
Smart Home Devices
The STM32WB35CEU6 is ideal for smart home devices such as smart locks, thermostats, and lighting controls. Its dual-core architecture allows concurrent BLE and Zigbee operation, enabling seamless integration with smart home ecosystems. The low power consumption (down to 1.71V supply) supports battery-powered devices with long life. The integrated radio eliminates the need for external RF components, reducing BOM cost and board space. With 512 KB flash, developers can implement complex application logic and over-the-air updates. The TrustZone-compatible secure enclave ensures secure communication and key storage, critical for smart locks. In a smart thermostat, the MCU manages temperature sensing, display, and BLE communication with a smartphone app, while the radio core handles the Zigbee protocol for interoperability with other smart home devices.
Recommended
Industrial Wireless Sensor Networks
In industrial settings, the STM32WB35CEU6 enables wireless sensor networks for monitoring temperature, vibration, and pressure. Its 802.15.4 support allows mesh networking via Thread or Zigbee, providing reliable communication in harsh environments. The wide operating temperature range (-40°C to +85°C) ensures operation in industrial conditions. The 12-bit ADC and multiple timers facilitate precise sensor data acquisition. The dual-core design offloads the radio stack to the Cortex-M0+, freeing the Cortex-M4 for real-time control and data processing. With +6 dBm output power and -96 dBm sensitivity, it achieves a link budget of 102 dB, sufficient for typical factory floor distances. The device's low power consumption enables battery-powered nodes that can operate for years. ST's comprehensive firmware libraries and application notes (e.g., AN5185) accelerate development of robust wireless sensor nodes.
Recommended
Healthcare Wearables
The STM32WB35CEU6 is well-suited for healthcare wearables like fitness trackers and heart rate monitors. Its BLE 5.4 support enables low-power communication with smartphones, while the Cortex-M4 core handles sensor fusion and algorithms. The device's small UFQFPN-48 package (7x7 mm) allows compact PCB designs. With 512 KB flash, developers can store complex algorithms and user data. The low supply voltage (1.71V) is compatible with coin-cell batteries, extending battery life. The integrated radio reduces power consumption compared to external transceivers. In a heart rate monitor, the MCU reads data from an optical sensor, processes it to calculate heart rate, and transmits via BLE to a companion app. The dual-core architecture ensures real-time processing without radio interference. ST's STM32CubeWB firmware includes BLE profiles for health devices, speeding up development.
Recommended
Asset Tracking
The STM32WB35CEU6 is ideal for asset tracking devices that require long battery life and reliable wireless communication. Its BLE 5.4 support allows connection to smartphones for configuration and data retrieval, while 802.15.4 enables mesh networking for large-scale tracking in warehouses. The low power consumption (sleep modes down to microamps) ensures battery life of months or years. The device's 512 KB flash can store tracking data and firmware updates. The integrated radio simplifies design and reduces cost. In a typical asset tag, the MCU periodically wakes up, reads GPS or other location data, and transmits via BLE to a gateway. The dual-core architecture allows the radio core to handle communication while the main core manages power and sensors. ST's firmware libraries support various BLE profiles for asset tracking, accelerating time-to-market.
Recommended
Smart Agriculture
The STM32WB35CEU6 enables smart agriculture solutions such as soil monitoring and irrigation control. Its 802.15.4 support allows mesh networking across large fields, while BLE enables local configuration via smartphone. The device's low power consumption is critical for solar-powered or battery-operated sensors. The 12-bit ADC can interface with soil moisture sensors, and the timers can control irrigation valves. The wide operating temperature range (-40°C to +85°C) suits outdoor environments. With 512 KB flash, developers can implement complex data logging and communication protocols. The dual-core architecture ensures reliable wireless communication even in noisy RF environments. In a soil monitoring system, the MCU reads sensor data, processes it, and sends alerts via BLE or Zigbee. ST's ecosystem includes reference designs for agricultural applications, reducing development effort.
Recommended
Smart Lighting
The STM32WB35CEU6 is perfect for smart lighting systems, enabling wireless control of LED lights via BLE or Zigbee. Its dual-core architecture allows simultaneous support for multiple protocols, making it compatible with various smart home ecosystems. The device's PWM timers can control LED brightness and color, while the ADC can monitor current for safety. The low power consumption is suitable for always-on lighting controllers. With 512 KB flash, developers can implement complex lighting scenes and schedules. The integrated radio eliminates the need for external RF modules, reducing cost and size. In a smart bulb, the MCU receives commands via BLE, adjusts the LED driver, and reports status. The TrustZone-compatible secure enclave ensures secure communication with smart home hubs. ST's firmware libraries include Zigbee Light Link profiles, accelerating development.
Recommended
Recommended Products Summary
Engineering reference data for STM32WB35CEU6 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32WB55CEU6 | STM32WB35CCU6 | STM32WB35CEU7 | nRF52840 |
|---|---|---|---|---|---|
| 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 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | Nordic Semiconductor |
| Core Processor | Cortex-M4 + Cortex-M0+ | Cortex-M4 + Cortex-M0+ | Cortex-M4 + Cortex-M0+ | Cortex-M4 + Cortex-M0+ | Cortex-M4F |
| Flash Memory | 512 KB | 1 MB | 256 KB | 512 KB | 1 MB |
| SRAM | 128 KB | 256 KB | 64 KB | 128 KB | 256 KB |
| RF Output Power | +6 dBm | +8 dBm | +6 dBm | +6 dBm | +8 dBm |
| Wireless Protocols | BLE 5.4, 802.15.4 | BLE 5.4, 802.15.4 | BLE 5.4, 802.15.4 | BLE 5.4, 802.15.4 | BLE 5.4, 802.15.4 |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +105°C | -40°C to +85°C |
Key Differentiators
- Dual-core architecture with dedicated radio processor (vs nRF52840)
- Cost-optimized with 512 KB flash (vs STM32WB55CEU6)
- Extended temperature variant available (vs STM32WB35CCU6)
Design Notes
For optimal RF performance, follow ST's reference design (AN5185) for the balun and antenna matching network. Place the balun and antenna as close to the RF pin (pin 43) as possible. Use a 50-ohm controlled impedance trace for the RF line. Keep the ground plane continuous under the RF section and provide adequate vias for grounding.
Decouple each VDD pin with a 100nF ceramic capacitor placed as close to the pin as possible. Additionally, place a 4.7uF bulk capacitor on the main VDD rail. For VDDA, use a 1uF capacitor and a ferrite bead to isolate analog noise. Ensure the supply voltage is within 1.71V to 3.6V and stable during RF transmission, which can cause current spikes.
The STM32WB35CEU6 in UFQFPN-48 package has a thermal resistance (theta_JA) of approximately 40°C/W. For typical wireless applications with average current consumption of 10mA at 3.3V, power dissipation is about 33mW, resulting in a temperature rise of only 1.3°C. However, during continuous RF transmission at +6 dBm, current can spike to 20mA, so ensure adequate copper pour on the PCB to dissipate heat.
Compliance Information
RoHS compliant per ST product page. Not AEC-Q100 qualified; for automotive, consider STM32WB35CEU7 with extended temperature range.
