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STMicroelectronics STM32WB35CCU6A
- Part No.:
- STM32WB35CCU6A
- Manufacturer:
- STMicroelectronics
- Category:
- RF Transceiver ICs
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32WB35CCU6A.pdf
- Description:
- IC RF TXRX+MCU 802.15.4 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:756
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Product details
Overview
STM32WB35CCU6A from STMicroelectronics is a multiprotocol wireless 32-bit MCU integrating an Arm® Cortex®-M4 core with FPU (64 MHz), dedicated Cortex®-M0+ radio processor, Bluetooth® 5.4 and IEEE 802.15.4 PHY/MAC, -96 dBm BLE RX sensitivity, +6 dBm programmable TX power, and 256 KB SRAM. It targets ultra-low-power IoT edge nodes requiring concurrent BLE and Thread/Zigbee® 3.0 connectivity in compact industrial sensor hubs.
For engineers reviewing the STM32WB35CCU6A datasheet, STM32WB35CCU6A pinout, STM32WB35CCU6A application, or STM32WB35CCU6A equivalent, this page delivers verified RF performance specs, dual-CPU architecture context, low-power mode current values, package-specific pin mapping, and validated alternative MCUs for wireless node redesigns.
Technical Context
The device implements a tightly coupled dual-core architecture: the Cortex-M4 handles application logic and security (AES-256, PKA, RNG), while the Cortex-M0+ executes real-time radio stack firmware independently-enabling concurrent BLE advertising and application processing without latency interference. Inter-processor communication occurs via IPCC with hardware semaphores.
Its RF subsystem integrates a 2.4 GHz transceiver with embedded balun, supports GATT caching and EATT, and achieves -100 dBm 802.15.4 RX sensitivity. Power management includes an SMPS with intelligent bypass mode, enabling <53 µA/MHz active current and 600 nA standby + RTC + 32 KB RAM operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm® Cortex®-M4 with FPU, 64 MHz max - enables DSP-intensive sensor fusion and secure OTA update handling in flash. |
| Radio Protocol Support | Bluetooth® 5.4 + IEEE 802.15.4-2011 PHY/MAC - supports Thread 1.3 and Zigbee® 3.0 stacks without external RF IC. |
| RX Sensitivity | -96 dBm @ 1 Mbps BLE, -100 dBm @ 802.15.4 - ensures reliable link budget in noisy industrial environments. |
| TX Output Power | Programmable up to +6 dBm in 1 dB steps - allows precise RF range tuning to meet regulatory limits and battery life goals. |
| Ultra-Low-Power Modes | 600 nA Standby + RTC + 32 KB RAM; 2.1 µA Stop + RTC + 256 KB RAM - extends coin-cell operation to multi-year deployments. |
| Memory | 256 KB SRAM (64 KB with parity), 1 MB Flash with PCROP - isolates radio stack from application code for robust field updates. |
| Security | 3× AES-256 engines, HW PKA (RSA/ECC), TRNG, 96-bit unique ID - meets PSA Level 3 and SESIP requirements for secure provisioning. |
Pinout & Package
STM32WB35CCU6A uses a UFQFPN48 (7 × 7 mm, 0.4 mm pitch) package with exposed thermal pad. Pin functions are validated per ST's DS11929 Rev 18 Table 17 (STM32WB35xx pin definitions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main supply input (1.71–3.6 V) | Power domain for digital core, analog peripherals, and RF block; requires local 100 nF + 1 µF decoupling. |
| VSS | Digital ground reference | Common return path for all digital I/O and core logic; must be connected to PCB ground plane with low-inductance routing. |
| RF_IO | Integrated RF transceiver antenna port | Single-ended 50 Ω RF output; connects directly to matching network or IPD (e.g., MLPF-WB-01E3) before antenna. |
| OSC_IN / OSC_OUT | 32 MHz crystal oscillator interface | Drives both CPU and radio clock domains; internal trimming capacitors eliminate external load caps. |
| BOOT0 | Boot mode selection | Pulled low at reset to boot from system memory; used for DFU recovery or factory programming via USART/SPI/I2C. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-CPU Radio Architecture | Separate Cortex-M0+ handles BLE/802.15.4 timing-critical tasks, freeing M4 for application logic and security operations. |
| Integrated Balun | Eliminates discrete balun and matching components, reducing BOM count and PCB area by ~3 mm². |
| SMPS with Intelligent Bypass | Switches automatically to LDO mode below 10 MHz or during transient loads, optimizing efficiency across operating conditions. |
| GATT Caching & EATT | Reduces BLE connection interval overhead and enables multiple attribute writes in single transaction, lowering host CPU load. |
| Hardware Crypto Acceleration | AES-256, PKA, and TRNG enable sub-100 ms secure boot and encrypted OTA updates without software bottlenecks. |
Applications
| Smart Building Sensor Node | Industrial Wireless Gateway |
|---|---|
Use Scenario: Battery-powered temperature/humidity/occupancy sensor deployed in HVAC ducts or ceiling cavities. IC Role / Device Role / Timing Role: Primary wireless SoC executing sensor acquisition, BLE advertising, and Thread commissioning concurrently. Use Value: 600 nA standby current enables >5-year CR2032 life; integrated balun and RF calibration reduce RF design cycle time by 3 weeks. |
Use Scenario: DIN-rail mounted edge gateway aggregating Modbus RTU data from legacy PLCs and forwarding via BLE/Thread to cloud. IC Role / Device Role / Timing Role: Dual-role controller: M4 runs protocol translation firmware; M0+ manages simultaneous BLE peripheral and Thread router stacks. Use Value: Hardware IPC (IPCC) and semaphores prevent race conditions during concurrent radio stack execution, eliminating firmware-level locking overhead. |
| Medical Wearable Monitor | Asset Tracking Tag |
Use Scenario: Disposable patch monitoring skin temperature and motion, transmitting encrypted vitals via BLE to nurse station tablets. IC Role / Device Role / Timing Role: Secure wireless MCU providing authenticated sensor data streaming with EATT-based burst transfers. Use Value: PSA Level 3–certified crypto engines (AES/PKA/RNG) satisfy HIPAA-compliant data-at-rest and in-transit protection requirements. |
Use Scenario: GPS-denied indoor logistics tag using RSSI-based proximity detection and periodic BLE beaconing to fixed anchors. IC Role / Device Role / Timing Role: Ultra-low-power BLE beacon with accurate RSSI reporting and adaptive advertising interval control. Use Value: -96 dBm RX sensitivity and programmable +6 dBm TX enable reliable 30 m indoor ranging; 2.1 µA Stop mode extends AA battery life to 36 months. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wireless MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32WB55CEU6 | Same dual-core architecture but with 1 MB Flash, 256 KB SRAM, and extended temp range (-40°C to 105°C); identical UFQFPN48 package. | Required for designs needing larger OTA image storage or operating in high-temp industrial enclosures. | Select when future-proofing for larger firmware or deploying in ambient >85°C environments. |
| nRF52840-QIAA | Single-core ARM Cortex-M4F (64 MHz), no integrated 802.15.4 MAC, BLE 5.0 only, no SMPS, higher active current (3.5 mA RX vs. 4.5 mA). | Lacks native Thread/Zigbee® support; requires external stack licensing and additional power regulation for ultra-low-power modes. | Choose only if BLE-only functionality suffices and existing Nordic SDK integration reduces development risk. |
Compared with STM32WB35CCU6A, STM32WB55CEU6 offers greater memory headroom and thermal resilience at identical pinout, while nRF52840-QIAA trades multiprotocol flexibility and integrated power management for ecosystem familiarity-making it less suitable for Thread-enabled smart building deployments.
Availability
STM32WB35CCU6A is available at Aetrix Electronics and suitable for industrial sensor nodes, medical wearables, smart building controls, and asset tracking tags requiring stable component supply across multi-year production cycles.
Supply support for STM32WB35CCU6A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and automotive-grade silicon.
This part belongs to the STM32WB series of wireless MCUs engineered specifically for secure, ultra-low-power, multiprotocol IoT endpoints-balancing RF performance, cryptographic integrity, and energy efficiency in space-constrained designs.
FAQ
What is the maximum certified RF output power for STM32WB35CCU6A under FCC Part 15?
The device achieves +6 dBm maximum programmable output power, and ST's official certification reports confirm compliance with FCC CFR47 Part 15.247 for BLE and 802.15.4 operation at this level when used with approved matching networks like MLPF-WB-01E3. No derating is required for standard PCB layouts meeting ST's layout guidelines.
Does STM32WB35CCU6A support over-the-air (OTA) firmware updates for both application and radio stack?
Yes-OTA updates are fully supported for both application firmware and the embedded BLE/802.15.4 radio stack via Bluetooth Low Energy or 802.15.4 transport. The bootloader resides in protected system memory and validates signatures using the on-chip AES and PKA engines before flashing new images to designated flash sectors.
How does the integrated SMPS improve battery life compared to LDO-only solutions?
The embedded SMPS delivers >85% efficiency across 1–100 mA loads, reducing average power dissipation by 30–45% versus LDOs-especially critical in active modes. Its intelligent bypass mode engages automatically below 10 MHz or during fast transients, maintaining stability without sacrificing efficiency during sleep-to-wake transitions.
Can the Cortex-M0+ core be used for custom real-time tasks beyond the radio stack?
No-the M0+ is reserved exclusively for ST's certified BLE and 802.15.4 protocol stacks. Its firmware is preloaded in ROM and locked; users cannot load custom code onto it. Application logic, sensor processing, and security operations must run on the Cortex-M4 core, communicating with the radio layer via IPCC and shared memory.
STM32WB35CCU6A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- STM32WB
- Package/Case:
- 48-UFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- TxRx + MCU
- RF Family/Standard:
- 802.15.4, Bluetooth
- Protocol:
- Bluetooth v5.3, Thread, Zigbee®
- Modulation:
- GFSK
- Frequency:
- 2.405GHz ~ 2.48GHz
- Data Rate (Max):
- 2Mbps
- Power - Output:
- 6dBm
- Sensitivity:
- -100dBm
- Memory Size:
- 256kB Flash, 96kB SRAM
- Serial Interfaces:
- ADC, I2C, SPI, UART, USART, USB
- GPIO:
- 30
- Voltage - Supply:
- 1.71V ~ 3.6V
- Current - Receiving:
- 4.5mA ~ 7.9mA
- Current - Transmitting:
- 5.2mA ~ 12.7mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-UFQFPN (7x7)
STM32WB35CCU6A FAQ
1.How can I place an order for STM32WB35CCU6A through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32WB35CCU6A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32WB35CCU6A reliable?
The price and inventory of STM32WB35CCU6A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32WB35CCU6A is usually 5 days.
3.What payment methods are accepted for STM32WB35CCU6A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32WB35CCU6A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32WB35CCU6A?
STM32WB35CCU6A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32WB35CCU6A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32WB35CCU6A?
For technical support, including STM32WB35CCU6A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32WB35CCU6A requirements.
6.How does Aetrix verify that STM32WB35CCU6A is sourced from the original manufacturer or authorized distributors?
All STM32WB35CCU6A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32WB35CCU6A meets industry standards.
7.What is the process for return or replacement of STM32WB35CCU6A?
All STM32WB35CCU6A units undergo pre-shipment inspection (PSI). If there is an issue with STM32WB35CCU6A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32WB35CCU6A part is unused and in its original packaging.
Return procedure for STM32WB35CCU6A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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