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STMicroelectronics STM32WLE4CBU6
- Part No.:
- STM32WLE4CBU6
- Manufacturer:
- STMicroelectronics
- Category:
- RF Transceiver ICs
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32WLE4CBU6.pdf
- Description:
- IC RF TXRX+MCU ISM<1GHZ 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,299
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Product details
Overview
STM32WLE4CBU6 from STMicroelectronics is a multiprotocol LPWAN 32-bit Arm® Cortex®-M4 microcontroller integrating LoRa®, (G)FSK, (G)MSK, and BPSK radio transceivers, 256 KB flash, 64 KB SRAM, and hardware AES-256 encryption. It operates from 150–960 MHz with –148 dBm LoRa® RX sensitivity (SF12, 10.4 kHz), +22 dBm programmable TX output, and ultra-low-power shutdown mode (31 nA). It targets battery-powered smart utility meters and remote environmental sensors requiring long-range, regulatory-compliant wireless connectivity.
For engineers reviewing the STM32WLE4CBU6 datasheet, STM32WLE4CBU6 pinout, STM32WLE4CBU6 application, or STM32WLE4CBU6 equivalent, key selection criteria include sub-GHz RF performance compliance (ETSI EN 300 220, FCC Part 15), integrated SMPS power management, dual-mode low-power operation (Stop2 @ 1.07 µA), and hardware PKA for secure over-the-air firmware updates.
Technical Context
The STM32WLE4CBU6 integrates a single-core Arm Cortex-M4 CPU running up to 48 MHz with ART Accelerator for zero-wait-state flash execution, MPU, and DSP instructions. Its RF subsystem includes a fully integrated transceiver with RF-PLL, configurable IF paths for LoRa® and FSK modes, and support for standardized protocols including LoRaWAN® and W-MBus.
Power architecture combines an embedded SMPS step-down converter, smart SMPS-to-LDO switching, and five selectable brownout reset thresholds. The device supports VDD = 1.8–3.6 V across –40 °C to +105 °C, with dedicated low-power timers, RTC with 32-bit sub-second counter, and 43 I/Os (most 5 V-tolerant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 @ 48 MHz with ART Accelerator, enabling deterministic real-time execution from flash without wait states. |
| RF Frequency Range | 150–960 MHz - covers global ISM bands (e.g., 868 MHz EU, 915 MHz US, 433 MHz ASIA) without external synthesizer. |
| LoRa® RX Sensitivity | –148 dBm at 10.4 kHz BW, SF12 - enables >15 km outdoor range in rural LPWAN deployments. |
| TX Output Power | Programmable up to +22 dBm (high-power path) or +15 dBm (low-power path) - meets ETSI/FCC spectral mask and conducted emission limits. |
| Ultra-Low-Power Mode | Stop2 (+ RTC): 1.07 µA @ VDD = 3 V - sustains decade-long battery life in wake-on-RX or periodic sensor polling. |
| Security Peripherals | AES-256 accelerator, PKA, TRNG, PCROP, RDP Level 2 - enables certified secure boot and OTA firmware authentication per IEC 62443. |
| Analog Peripherals | 12-bit ADC @ 2.5 Msps (16-bit oversampled), 12-bit DAC, 2x ultra-low-power comparators - supports local signal conditioning without external ICs. |
Pinout & Package
UFQFPN48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant ECOPACK2, with exposed thermal pad for enhanced RF stability and thermal dissipation in compact LPWAN modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD_RF / VDD_PA | RF power supply pins | Dedicated 1.8–3.6 V supplies for RF transceiver and power amplifier - isolate noise-sensitive analog RF section from digital domain. |
| ANT / RFIO | Antenna interface | Differential RF port supporting direct connection to matching network/IPD - optimized for 50 Ω impedance and harmonic suppression per FCC/ETSI. |
| OSC_IN / OSC_OUT | 32 MHz crystal oscillator terminals | Supports high-accuracy timing for LoRa® symbol timing and frequency synthesis - compatible with ±10 ppm TCXO for temperature-stable channel planning. |
| VBAT | Backup power input | Enables RTC and 20×32-bit backup registers during main power loss - critical for time-stamped event logging in utility metering. |
| PA0–PA15, PB0–PB15, PC0–PC15, PD2 | General-purpose I/Os | 43 total GPIOs, most 5 V-tolerant - allow direct interfacing with legacy industrial sensors, UART peripherals, and SPI flash without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Sub-GHz Transceiver | Single-die LoRa®/(G)FSK/(G)MSK/BPSK radio eliminates external RF front-end - reduces BOM count and PCB area by ≥30% vs discrete solutions. |
| Hardware PKA Accelerator | Offloads ECC key generation and signature verification - cuts OTA firmware update verification time from seconds to <100 ms, preserving battery life. |
| SMPS + Smart LDO Switch | Dynamic power-path selection between SMPS (high efficiency) and LDO (low noise) - maintains RF SNR while achieving >85% system efficiency at 10–100 mA loads. |
| ART Accelerator + MPU | Zero-wait-state flash execution + memory protection - ensures deterministic real-time response for time-critical MAC layer processing in LoRaWAN® Class C devices. |
| IPD-Compatible RF Layout | Validated reference designs for ST's IPD companion chips (e.g., SM6T15F for 868 MHz) - accelerates regulatory certification by pre-characterizing matching, filtering, and balun performance. |
Applications
| Smart Utility Metering | Remote Environmental Monitoring |
|---|---|
|
Use Scenario: Battery-powered gas/water/electricity meters transmitting hourly consumption data over 5–10 km rural distances. IC Role / Device Role / Timing Role: System-on-chip MCU + LoRa® transceiver handling MAC-layer scheduling, AES-encrypted payload assembly, and precise symbol timing via 32 MHz TCXO. Use Value: Achieves >15-year battery life using Stop2 mode and LoRa® SF12, while meeting EN 13757-4 (W-MBus) and LoRaWAN® 1.0.4 compliance out-of-box. |
Use Scenario: Solar-powered soil moisture and air quality nodes deployed in agricultural fields with intermittent cloud cover. IC Role / Device Role / Timing Role: Dual-role controller: manages ADC sampling of analog sensors and executes adaptive TX duty cycling based on RSSI and battery voltage. Use Value: Integrated SMPS extends solar harvesting efficiency; hardware TRNG + PKA enables secure join-request signing without external crypto ICs. |
| Industrial Asset Tracking | Smart Waste Management |
|
Use Scenario: GPS-denied indoor/outdoor tracking of pallets and containers using geofence-triggered LoRa® beacons. IC Role / Device Role / Timing Role: Real-time motion detection via internal comparator-driven wake-up, followed by rapid LoRa® burst transmission using pre-calibrated RF paths. Use Value: Ultra-fast wakeup from Stop2 (<10 µs) and hardware AES encryption ensure tamper-proof location reporting with sub-second latency. |
Use Scenario: Fill-level monitoring in municipal waste bins using ultrasonic distance sensing and fill-state alerts. IC Role / Device Role / Timing Role: Low-power timer triggers ADC-based ultrasonic echo measurement; LPUART interfaces with local display; LoRa® handles infrequent status uploads. Use Value: Single-chip integration eliminates separate MCU, RF, and power management ICs - reduces node cost by ~$1.20 and simplifies EN 300 220 Class 1 certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LPWAN SoC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SX1262 + STM32L4 | Discrete RF + MCU solution; SX1262 lacks integrated PKA, AES, or SMPS - requires external crypto IC and DC/DC. | Higher BOM cost and larger PCB footprint; longer time-to-certification due to RF layout sensitivity. | Select when legacy design reuse or custom RF tuning (e.g., proprietary modulation) is required. |
| STM32WLE5CCU6 | Pin-compatible upgrade with 256 KB flash (vs. 192 KB in WLE4CBU6); identical RF specs, same package and pinout. | No change in RF performance or power profile - drop-in replacement for future-proofing firmware scalability. | Select when >192 KB application code space is needed for advanced edge analytics or dual-firmware A/B updates. |
Compared with SX1262+STM32L4, the STM32WLE4CBU6 reduces system complexity and certification risk through monolithic integration; compared with STM32WLE5CCU6, it trades flash capacity for cost-optimized deployment where firmware size is constrained to ≤192 KB.
Availability
STM32WLE4CBU6 is available at Aetrix Electronics and suitable for smart utility metering, remote environmental monitoring, industrial asset tracking, and smart waste management requiring stable component supply across multi-year production cycles.
Supply support for STM32WLE4CBU6 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, and MEMS sensors for industrial, automotive, and IoT markets.
The STM32WLE series was developed specifically for ultra-low-power, regulatory-compliant LPWAN endpoints - combining Arm Cortex-M4 compute, multi-modulation RF, and hardware security in a single die to accelerate certified IoT node development.
FAQ
Does STM32WLE4CBU6 support LoRaWAN® Class A, B, and C operation?
Yes - the integrated radio and MCU firmware stack supports all three LoRaWAN® classes. Class C is enabled via the 32-bit RTC sub-second wakeup counter and ultra-low-power timers, allowing near-continuous receive windows with typical current draw of 4.82 mA in RX mode and 1.07 µA in Stop2 idle state.
What RF certifications does STM32WLE4CBU6 ship with pre-validated reference designs?
ST provides pre-validated reference designs compliant with ETSI EN 300 220 (Europe), FCC Part 15.247 (USA), and ARIB STD-T67 (Japan). These include matching networks using ST's SM6T15F IPD for 868 MHz and SM6T22F for 915 MHz, covering conducted emissions, spurious emissions, and field strength requirements.
Can the embedded SMPS be disabled in favor of external LDO supply?
Yes - the SMPS can be bypassed via the SMPS_EN pin, allowing direct LDO supply to VDD_CORE. This configuration is used when ultra-low noise is prioritized over efficiency, such as in high-precision ADC measurements or sensitive RF receiver testing environments.
Is the 32 MHz crystal oscillator mandatory for LoRa® operation?
No - the device supports TCXO input on OSC_IN with programmable supply voltage (1.2–3.3 V), enabling use of temperature-compensated oscillators for improved frequency stability in outdoor deployments. Internal RC oscillators are insufficient for LoRa® symbol timing accuracy and are not recommended for RF operation.
STM32WLE4CBU6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 48-UFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- TxRx + MCU
- RF Family/Standard:
- General ISM < 1GHz
- Protocol:
- LoRaWAN 1.0, Sigfox, Wireless M-Bus
- Modulation:
- BPSK, FSK, GFSK, GMSK, MSK
- Frequency:
- 150MHz ~ 960MHz
- Data Rate (Max):
- 300kbps
- Power - Output:
- 22dBm
- Sensitivity:
- -148dBm
- Memory Size:
- 128kB Flash
- Serial Interfaces:
- ADC, GPIO, I2C, I2S, IrDA, JTAG, PWM, SPI, UART, USART
- GPIO:
- 29
- Voltage - Supply:
- 1.8V ~ 3.6V
- Current - Receiving:
- 4.47mA ~ 10.22mA
- Current - Transmitting:
- 21mA ~ 120mA
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 48-UFQFPN (7x7)
STM32WLE4CBU6 FAQ
1.How can I place an order for STM32WLE4CBU6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32WLE4CBU6 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 STM32WLE4CBU6 reliable?
The price and inventory of STM32WLE4CBU6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32WLE4CBU6 is usually 5 days.
3.What payment methods are accepted for STM32WLE4CBU6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32WLE4CBU6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32WLE4CBU6?
STM32WLE4CBU6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32WLE4CBU6 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 STM32WLE4CBU6?
For technical support, including STM32WLE4CBU6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32WLE4CBU6 requirements.
6.How does Aetrix verify that STM32WLE4CBU6 is sourced from the original manufacturer or authorized distributors?
All STM32WLE4CBU6 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 STM32WLE4CBU6 meets industry standards.
7.What is the process for return or replacement of STM32WLE4CBU6?
All STM32WLE4CBU6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32WLE4CBU6, 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 STM32WLE4CBU6 part is unused and in its original packaging.
Return procedure for STM32WLE4CBU6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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