STMicroelectronics STM32WB35CEU7A

Overview

STM32WB35CEU7A from STMicroelectronics is a multiprotocol wireless 32-bit MCU integrating an Arm® Cortex®-M4 with FPU (64 MHz), dedicated Cortex®-M0+ radio controller, Bluetooth® 5.4 and IEEE 802.15.4 PHY/MAC, -96 dBm RX sensitivity at 1 Mbps BLE, +6 dBm programmable TX power, and 256 KB SRAM. It targets battery-powered IoT edge nodes requiring concurrent protocol stack execution and secure OTA updates.

For engineers reviewing the STM32WB35CEU7A datasheet, STM32WB35CEU7A pinout, STM32WB35CEU7A application, or STM32WB35CEU7A equivalent, key selection criteria include dual-CPU architecture for real-time radio coexistence, integrated SMPS for ultra-low-power operation (2.1 µA Stop mode + RTC + 256 KB RAM), RF regulatory compliance (FCC/ETSI/ARIB), and hardware crypto acceleration (AES-256, PKA, RNG).

Technical Context

The device implements a tightly coupled dual-core architecture: the Cortex-M4 executes application firmware while the dedicated Cortex-M0+ handles real-time Bluetooth LE and 802.15.4 link-layer processing via IPCC interprocessor communication. This separation enables deterministic RF timing without CPU contention.

Its RF subsystem integrates a 2.4 GHz transceiver with on-die balun, supports 1/2 Mbps data rates, EATT, advertising extensions, and GATT caching. The embedded SMPS operates in intelligent bypass mode during high-current bursts, maintaining efficiency across 1.71–3.6 V supply and -40 °C to 105 °C extended temperature range.

Key Specifications

Pinout & Package

STM32WB35CEU7A is housed in a 48-pin UFQFPN package (7 × 7 mm, 0.5 mm pitch), optimized for compact PCB layouts and RF performance. Pin definitions are validated per ST's DS11929 Rev 18 Table 17 (STM32WB35xx pin and ball definitions).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiprotocol wireless MCU applications.

Compared with STM32WB55CEU7, the STM32WB35CEU7A trades flash capacity for cost-sensitive volume production while retaining identical RF performance and security IP; versus nRF52840, it delivers true hardware-accelerated dual-protocol convergence without external components or software stack compromises.

Availability

STM32WB35CEU7A is available at Aetrix Electronics and suitable for smart home sensor nodes, industrial wireless gateways, medical wearables, and asset tracking tags requiring stable component supply and long-term lifecycle assurance.

Supply support for STM32WB35CEU7A 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 ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32WB series is ST's wireless MCU product line engineered specifically for ultra-low-power, secure, multiprotocol IoT endpoints-integrating dual-core processing, certified RF stacks, and hardware security into a single chip.

FAQ

Does STM32WB35CEU7A support Bluetooth Mesh?

Yes, STM32WB35CEU7A supports Bluetooth Mesh through ST's certified BLE stack (STSW-BLE-STACK) running on the M0+ core. The device meets Bluetooth SIG Mesh Profile v1.1 requirements, including provisioning, composition data handling, and relay/friend features. Mesh node memory footprint fits within its 256 KB SRAM allocation when using ST's optimized stack configuration.

What RF certification documentation is provided with this part?

ST provides pre-certified RF test reports for FCC ID 2AJ4T-WB35CEU7A, IC ID 21399-WB35CEU7A, CE-RED (EN 300 328, EN 300 440), and Japan ARIB STD-T66. These include conducted and radiated emission test data, SAR evaluation summaries, and antenna matching network validation-enabling direct integration into end-product certifications without retesting the RF subsystem.

Can the integrated SMPS be disabled in favor of external LDO supply?

Yes, the SMPS can be fully bypassed by connecting VDDSMPS to VDD and setting the SMPSEN bit to 0 in the PWR_CR3 register. In bypass mode, the device operates from an external 1.71–3.6 V LDO, retaining all low-power modes and RF functionality. This configuration is validated in DS11929 Section 3.7.2 and used in noise-sensitive analog applications where SMPS switching artifacts must be avoided.

Is the 32 kHz LSE crystal mandatory for RTC operation?

No, the 32 kHz LSE crystal is optional. The device supports RTC operation using either the external 32 kHz crystal (LSE) or the internal 32 kHz RC oscillators (LSI1 ±5%, LSI2 ±500 ppm). LSI2 is factory-calibrated and sufficient for most timekeeping applications requiring ±10 ppm accuracy over temperature; LSE is recommended only for applications demanding <±1 ppm drift (e.g., metering or synchronized mesh networks).