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STMicroelectronics BLUENRG-345MT
- Part No.:
- BLUENRG-345MT
- Manufacturer:
- STMicroelectronics
- Category:
- RF Transceiver ICs
- Package:
- 48-TFQFN Exposed Pad
- Datasheet:
-
BLUENRG-345MT.pdf
- Description:
- IC RF TXRX+MCU BLE 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,500
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Product details
Overview
BLUENRG-345MT from STMicroelectronics is a programmable Bluetooth® Low Energy 5.2 System-on-Chip integrating an Arm® Cortex®-M0+ core (64 MHz), 256 KB flash, 64 KB RAM, and a dedicated BlueNRG radio coprocessor. It delivers -104 dBm RX sensitivity at 125 kbps (Coded PHY), +8 dBm programmable TX output, and supports up to 128 simultaneous BLE connections - deployed in industrial sensor nodes requiring long-range, ultra-low-power wireless telemetry.
For engineers reviewing the BLUENRG-345MT datasheet, BLUENRG-345MT pinout, BLUENRG-345MT application, or BLUENRG-345MT equivalent, key selection criteria include its dual-role BLE 5.2 stack support (peripheral/central/mesh), integrated SMPS for sub-1 µA DEEPSTOP current (1.8 V), hardware AES-128/PKA/RNG security accelerators, and QFN48 package with 32 I/Os (28 wake-capable, 31 5 V-tolerant).
Technical Context
The BLUENRG-345MT implements a partitioned BLE 5.2 protocol stack: time-critical layers (PHY/MAC/link layer) handled by the DMA-based BlueNRG core coprocessor, while non-critical stack layers and application code run on the Cortex-M0+. Its RF subsystem uses a low-IF receiver architecture with integrated balun and supports Coded PHY (S=2/S=8), LE 2 Mbps, advertising extensions, and periodic advertising sync transfer.
Power management combines an intelligent SMPS (1.2–1.9 V output) with three voltage domains (VDD33/VDD12o/VDD12i), enabling 10 nA SHUTDOWN and 0.6 µA DEEPSTOP (with external LSE). Security includes hardware-accelerated ECC (PKA), AES-128, true RNG, flash read/write protection, and SWD disable - all verified per Bluetooth SIG QDID #217217.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| BLE Version | Bluetooth 5.2 compliant - enables long-range Coded PHY, GATT caching, and LE L2CAP connection-oriented channels for reliable mesh networking. |
| RX Sensitivity | -104 dBm @ 125 kbps (Coded S=8) - extends outdoor range to >1 km in line-of-sight industrial monitoring. |
| TX Output Power | Programmable up to +8 dBm - allows dynamic link budget adjustment without external PA for cost-sensitive edge nodes. |
| CPU Core | Arm Cortex-M0+ @ 64 MHz - executes BLE stack + application firmware concurrently with 18 µA/MHz active efficiency. |
| Memory | 256 KB flash / 64 KB SRAM (4 banks) - supports OTA firmware updates and multi-context BLE role switching (central + peripheral). |
| Security Hardware | AES-128 co-processor, PKA, RNG, 64-bit UID - enables FIPS-compliant key generation and secure boot without software overhead. |
| Operating Temp | -40 °C to +105 °C - qualified for deployment in uncontrolled industrial enclosures and automotive under-hood environments. |
Pinout & Package
VFQFPN48 (6 × 6 mm, 0.4 mm pitch) package with exposed thermal pad. Pin functions validated per STMicroelectronics DS13282 Rev 6 (pages 42–46) and RM0479 reference manual.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO / VSS | Digital power supply / Ground | 1.7–3.6 V I/O domain; VSS pins must connect to solid ground plane including exposed pad for thermal and RF stability. |
| VDD12O / VDD12I | Always-on / Interruptible digital core supplies | Enables selective power gating: VDD12I shuts down in DEEPSTOP to reduce leakage; VDD12O remains active for RTC/WDT retention. |
| RF_IN / RF_OUT | Integrated balun RF interface | Single-ended 50 Ω antenna port; internal transformer eliminates need for external matching network in basic layouts. |
| PA4–PA11 | DEEPSTOP wake-up GPIOs | 8 pins retain output drive capability (static level, LSE, RTC) during DEEPSTOP - enables sensor-triggered wake without external logic. |
| BOOT0 | Boot mode selection | Pulled low for normal flash execution; high for UART bootloader entry - critical for field firmware recovery. |
Key Features
| Feature | Design Value |
|---|---|
| BLE 5.2 Dual-Role Stack | Hardware-accelerated BlueNRG coprocessor handles timing-critical BLE operations (advertising, scanning, connection events), freeing Cortex-M0+ for application logic and concurrent multi-role operation. |
| Ultra-Low-Power DEEPSTOP | 0.6 µA (with external LSE + BLE wake sources) - enables 10-year battery life in coin-cell-powered sensors using scheduled BLE advertisements. |
| Integrated SMPS Regulator | Configurable 1.2–1.9 V output with bypass mode - improves system efficiency by >30% vs. LDO-only solutions at 3.3 V input, reducing thermal load in dense PCB layouts. |
| Hardware Security Suite | Dedicated PKA engine accelerates ECDH key exchange in <10 ms; AES-128 encrypts OTA payloads at 12.5 MB/s - meets Bluetooth SIG LE Secure Connections requirements. |
| Flexible Memory Architecture | Four independent 16 KB SRAM banks with configurable retention in DEEPSTOP - allows real-time data logging in SRAM0 while powering down application buffers to save energy. |
Applications
| Industrial Sensor Node | Smart Building Occupancy Monitor |
|---|---|
Use Scenario: Wireless temperature/humidity/CO₂ sensor mounted inside HVAC ducts, transmitting data every 5 minutes via BLE mesh to gateway. IC Role / Device Role / Timing Role: Standalone BLE SoC executing both sensor fusion firmware and BLE mesh node stack; uses DEEPSTOP between transmissions to minimize average current. Use Value: -104 dBm sensitivity ensures reliable 200 m indoor range through metal ductwork; integrated SMPS extends AA battery life to 7 years. | Use Scenario: Battery-powered PIR + ambient light sensor in office ceiling tile, detecting occupancy and adjusting lighting via BLE direct reporting. IC Role / Device Role / Timing Role: BLE peripheral with fast wake-from-DEEPSTOP (<100 µs) triggered by PIR interrupt; transmits encrypted presence event within 15 ms of detection. Use Value: 28 wake-capable GPIOs allow direct PIR/light sensor interfacing; hardware RNG enables per-event AES encryption without CPU delay. |
| Medical Wearable Patch | Asset Tracking Tag |
Use Scenario: Disposable ECG patch transmitting raw waveform snippets to smartphone via BLE, requiring clinical-grade data integrity and low heat dissipation. IC Role / Device Role / Timing Role: BLE central + peripheral hybrid: collects analog ECG via 12-bit ADC, processes with Cortex-M0+, then streams securely to phone using LE L2CAP COC. Use Value: 12-bit ADC with decimation filter achieves 16-bit effective resolution for diagnostic-quality waveforms; 105 °C rating supports sterilization cycles. | Use Scenario: Logistics pallet tag reporting location via BLE beaconing to gate-mounted scanners, operating in warehouses with wide temperature swings. IC Role / Device Role / Timing Role: BLE advertiser only - broadcasts encrypted UUID/TX power at 100 ms intervals using hardware timer-triggered DEEPSTOP wake cycles. Use Value: +8 dBm TX power compensates for metal pallet interference; -40 °C to +105 °C rating ensures operation in refrigerated and outdoor storage zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Bluetooth Low Energy SoC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Nordic nRF52840 | ARM Cortex-M4F core, 1 MB flash, no integrated SMPS; higher active current (4.6 mA RX) | Better for compute-heavy applications (audio, ML inference); less optimal for coin-cell lifetime-critical deployments | Select when floating-point math or larger OTA payload capacity is required over ultra-low-power longevity. |
| Texas Instruments CC2642R | Same BLE 5.2 features but 48 MHz Cortex-M4F; lacks hardware PKA and has lower RX sensitivity (-96 dBm @ 1 Mbps) | Suited for TI ecosystem integration (SimpleLink SDK); weaker RF performance limits range in noisy industrial settings | Choose when leveraging TI's extensive BLE mesh and multiprotocol (BLE + IEEE 802.15.4) toolchain outweighs sensitivity trade-off. |
Compared with nRF52840 and CC2642R, BLUENRG-345MT offers superior RF sensitivity (-104 dBm), lowest DEEPSTOP current (0.6 µA), and integrated SMPS - making it optimal for battery-constrained industrial and medical edge nodes where RF reliability and 10-year lifetime are mandatory.
Availability
BLUENRG-345MT is available at Aetrix Electronics and suitable for industrial sensor nodes, smart building occupancy monitors, medical wearable patches, and asset tracking tags requiring stable component supply across extended product lifecycles.
Supply support for BLUENRG-345MT 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 wireless SoCs for industrial, automotive, and consumer markets.
The BlueNRG-LP product line targets ultra-low-power wireless connectivity in battery-operated edge devices, emphasizing BLE 5.2 feature completeness, regulatory compliance (FCC/ETSI/ARIB), and hardware-accelerated security for certified IoT deployments.
FAQ
What BLE 5.2 features does BLUENRG-345MT support in hardware?
BLUENRG-345MT implements Coded PHY (S=2/S=8), 2 Mbps data rate, advertising extensions, channel selection algorithm #2, GATT caching, LE Ping, periodic advertising, LE L2CAP connection-oriented channels, and LE power control - all accelerated by the BlueNRG coprocessor per Bluetooth SIG QDID #217217.
Does BLUENRG-345MT require external components for basic BLE operation?
No external matching network is needed due to its integrated balun; only a single 50 Ω antenna and standard decoupling capacitors (as specified in DS13282 Section 5.2) are required. An external IPD (MLPF-NRG-01D3) is optional for enhanced harmonic filtering in high-noise environments.
How is flash memory protected against unauthorized access?
Flash protection is enforced via hardware lock bits: read/write protection can be enabled per 2 KB page or globally; SWD debug access is disabled permanently after programming the option bytes; secure bootloader validates firmware signatures before execution using the embedded PKA and AES engines.
What is the maximum number of concurrent BLE connections supported?
BLUENRG-345MT supports up to 128 physical connections in total, with flexible role allocation - e.g., simultaneously acting as 32 peripherals and 1 central, or 64 peripherals and 1 broadcaster - managed by the BlueNRG coprocessor without CPU intervention.
BLUENRG-345MT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- BlueNRG
- Package/Case:
- 48-TFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- TxRx + MCU
- RF Family/Standard:
- Bluetooth
- Protocol:
- Bluetooth v5.2
- Modulation:
- GFSK
- Frequency:
- 2.4GHz ~ 2.4835GHz
- Data Rate (Max):
- 2Mbps
- Power - Output:
- 8dBm
- Sensitivity:
- -97dBm
- Memory Size:
- 256kB Flash, 64kB RAM
- Serial Interfaces:
- I2C, SPI
- GPIO:
- 32
- Voltage - Supply:
- 1.7V ~ 3.6V
- Current - Receiving:
- 3.4 mA
- Current - Transmitting:
- 4.3mA
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-QFN (6x6)
BLUENRG-345MT FAQ
1.How can I place an order for BLUENRG-345MT through Aetrix?
Please submit a Request for Quotation (RFQ) for BLUENRG-345MT 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 BLUENRG-345MT reliable?
The price and inventory of BLUENRG-345MT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BLUENRG-345MT is usually 5 days.
3.What payment methods are accepted for BLUENRG-345MT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BLUENRG-345MT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BLUENRG-345MT?
BLUENRG-345MT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BLUENRG-345MT 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 BLUENRG-345MT?
For technical support, including BLUENRG-345MT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BLUENRG-345MT requirements.
6.How does Aetrix verify that BLUENRG-345MT is sourced from the original manufacturer or authorized distributors?
All BLUENRG-345MT 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 BLUENRG-345MT meets industry standards.
7.What is the process for return or replacement of BLUENRG-345MT?
All BLUENRG-345MT units undergo pre-shipment inspection (PSI). If there is an issue with BLUENRG-345MT, 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 BLUENRG-345MT part is unused and in its original packaging.
Return procedure for BLUENRG-345MT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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