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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersSTM32L475RGT7TR
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STM32L475RGT7TR - STMicroelectronics

Manufacturer Part Number
STM32L475RGT7TR
Manufacturer
STMicroelectronics
Allelco Part Number
98D-STM32L475RGT7TR
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
39,240 pcs available, New & Original
Parts Description
IC MCU 32BIT 1MB FLASH 64LQFP
Package
64-LQFP (10x10)
Data sheet
STM32L475RGT7TR.pdf

PCN Packaging

2.73KHz.pdf

PCN Assembly/Origin

STM8/STM32 10/Mar/2020.pdf

HTML Datasheet

STM32L475xx Datasheet.pdf
RoHs Status
ROHS3 Compliant
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In stock: 39240
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Specifications

STM32L475RGT7TR Tech Specifications
STMicroelectronics - STM32L475RGT7TR technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - STM32L475RGT7TR

Product Attribute Attribute Value
Manufacturer STMicroelectronics
Voltage - Supply (Vcc/Vdd) 1.71V ~ 3.6V
Supplier Device Package 64-LQFP (10x10)
Speed 80MHz
Series STM32L4
RAM Size 128K x 8
Program Memory Type FLASH
Program Memory Size 1MB (1M x 8)
Peripherals Brown-out Detect/Reset, DMA, PWM, WDT
Package / Case 64-LQFP
Package Tape & Reel (TR)
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 105°C (TA)
Number of I/O 51
Mounting Type Surface Mount
EEPROM Size -
Data Converters A/D 16x12b; D/A 2x12b
Core Size 32-Bit Single-Core
Core Processor ARM® Cortex®-M4
Connectivity CANbus, I²C, IrDA, LINbus, MMC/SD, QSPI, SAI, SPI, SWPMI, UART/USART, USB OTG
Base Product Number STM32L475

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN 3A991A2
HTSUS 8542.31.0001

Frequently Asked Questions(FAQ)

How does the STM32L475RGT7TR compare to other STM32L4 series microcontrollers in terms of power consumption and processing speed, particularly when operating at 80MHz with 1.71V to 3.6V supply voltage?
The STM32L475RGT7TR delivers an optimal balance between performance and energy efficiency within the STM32L4 family. Running at up to 80MHz with a core voltage range of 1.71V to 3.6V, it achieves a typical active current consumption of approximately 110 µA/MHz in Run mode, which is competitive for ultra-low-power applications. Compared to lower-end L4 models like the STM32L432KC, which tops out at 48MHz, the L475 offers significantly faster execution without sacrificing the L4’s sleep-mode efficiencies below 1 µA. When paired with dynamic voltage scaling and clock gating, this enables battery-powered systems to maintain responsiveness while extending operational life.
What are the key differences in peripheral integration between the STM32L475RGT7TR and the STM32L476RET6, especially regarding communication interfaces and memory architecture?
While both share the same ARM Cortex-M4 core and operate at up to 80MHz, the STM32L475RGT7TR differs from the STM32L476RET6 in packaging and some I/O assignments rather than core peripherals. The L475 variant maintains identical connectivity—CANbus, USB OTG, QSPI, SAI, and multiple UARTs—but uses a 64-pin LQFP package instead of the 64-LQFP (10x10) used here. Memory-wise, they share 1MB Flash and 128KB RAM. However, the L475RGT7TR’s tape & reel packaging makes it more suitable for automated assembly, whereas the L476RET6 may be available in different thermal or layout configurations. Neither includes external EEPROM support.
Can the STM32L475RGT7TR reliably drive USB 2.0 full-speed devices, and what external components are required for stable OTG functionality?
Yes, the STM32L475RGT7TR fully supports USB 2.0 full-speed operation via its built-in USB OTG HS/FS controller. To ensure reliable enumeration and data transfer, an external 1.5kΩ pull-up resistor on D+ (for full-speed) and a 15pF series capacitor on D+ and D- lines are typically required. Additionally, a ferrite bead and decoupling capacitors near the VDD_USB pin help reduce noise. A crystal or ceramic resonator is not mandatory due to internal PLL support, but precise timing improves signal integrity. The device must operate within the 1.71V–3.6V supply range, so careful power rail design is essential.
In high-temperature environments exceeding 85°C, how does the STM32L475RGT7TR maintain stability, and what design considerations apply for long-term reliability?
The STM32L475RGT7TR is rated for industrial temperature ranges up to 105°C, making it suitable for extended high-heat conditions. At elevated temperatures, leakage currents increase slightly, potentially affecting deep-sleep power budgets. Engineers should account for this by reducing wake-up frequency or using lower-power modes more aggressively. Decoupling capacitance values may need adjustment due to temperature-dependent ESR changes in capacitors. Additionally, PCB layout must minimize trace inductance and ensure adequate thermal relief under the LQFP package. Long-term reliability also depends on adherence to MSL 3 handling procedures and avoiding excessive solder reflow cycles beyond three passes.
How does the integrated ADC on the STM32L475RGT7TR perform in terms of conversion accuracy and settling time, and can it simultaneously sample multiple channels without interference?
The STM32L475RGT7TR features a 12-bit successive approximation ADC with 16 internal channels and a maximum sampling rate of 5.3 Msps per channel. In practice, interleaved sampling across multiple channels introduces minimal crosstalk due to dedicated analog multiplexers and shielding. Typical integral nonlinearity (INL) is ±1.5 LSB, and differential nonlinearity stays within ±0.5 LSB under normal conditions. With proper calibration and use of the internal voltage reference (2.048V), absolute accuracy remains within ±3 mV over the -40°C to 105°C range. Simultaneous sampling is possible using the ADC’s dual-rank feature, allowing two groups to sample independently, though shared conversion time limits total throughput.
What trade-offs exist between using the internal RC oscillator versus an external crystal on the STM32L475RGT7TR for precision-critical applications such as sensor calibration or timekeeping?
The STM32L475RGT7TR includes a calibrated internal 16 MHz RC oscillator with ±1% accuracy over temperature and voltage, sufficient for many control tasks. However, for applications requiring tight timing tolerance—such as capacitive sensing or motor control feedback loops—an external 8 MHz crystal provides better stability (±20 ppm typical). External crystals demand additional PCB real estate, loading capacitors, and careful routing to avoid EMI. The internal oscillator reduces BOM cost and board complexity but sacrifices long-term drift performance. For RTC functions, the internal low-speed clock (LSI) suffices, though an external 32.768 kHz watch crystal offers superior accuracy.
Is it feasible to upgrade firmware on the STM32L475RGT7TR in the field using UART bootloader mode, and what security precautions must be observed?
Yes, the STM32L475RGT7TR supports in-system programming (ISP) via UART through its built-in System Memory bootloader. This allows field updates without removing the device from the circuit. However, enabling write protection or readout protection (RDP Level 1) prevents unauthorized access to the flash. Once RDP Level 2 is set, firmware cannot be read back, but also prevents further modification unless mass erase is performed, which erases all user data. Engineers should implement secure authentication protocols during update sequences and verify checksums post-flash. Debug interfaces like SWD should remain disabled in production units to prevent physical probing.
How does the DMA controller in the STM32L475RGT7TR facilitate efficient peripheral data handling, and what are the limitations when transferring large blocks of data between SPI and memory?
The STM32L475RGT7TR integrates a flexible DMA controller supporting up to 16 streams with circular buffering and flow control. It offloads CPU-intensive transfers such as SPI bursts or USB packets, reducing interrupt overhead. When moving data between SPI and memory, the DMA can operate in double-buffer mode to allow ping-pong transfers without CPU intervention. However, maximum throughput is constrained by the SPI peripheral’s clock divider settings and AHB bus bandwidth. For sustained transfers above 2 MB/s, memory wait states may become necessary if accessing slow external SRAM. The DMA also supports scatter-gather operations, enabling complex data routing with minimal code.
What impact does operating the STM32L475RGT7TR near its maximum junction temperature have on flash programming reliability and retention characteristics?
Flash memory programming success decreases as the STM32L475RGT7TR approaches 105°C ambient due to increased electron tunneling resistance in floating gates. ST specifies that programming should occur at or below 85°C for guaranteed endurance (>10,000 cycles). Above this threshold, cycle counts drop sharply, and data retention may fall below 10 years. If high-temperature operation is unavoidable, programming should happen during cooler periods, or use external non-volatile memory with wear leveling. Additionally, ensure adequate power supply stability during erase/write sequences, as voltage droop can corrupt pages.
Can the STM32L475RGT7TR be safely used in automotive-grade designs despite being classified as industrial rather than AEC-Q100 qualified?
The STM32L475RGT7TR is not AEC-Q100 certified, so its suitability for automotive applications depends on system-level risk assessment. While it meets industrial-grade reliability standards and operates across -40°C to 105°C, automotive environments demand higher fault tolerance, electromagnetic compatibility, and lifecycle continuity. Use in safety-critical systems requires additional derating, conformal coating, and rigorous environmental testing. For functional safety compliance (e.g., ISO 26262), consider dedicated automotive MCUs like the STM32G4 series. In non-critical infotainment or body electronics, the L475 may suffice with proper validation.
How does the brown-out detection (BOD) feature in the STM32L475RGT7TR protect against voltage sags, and what thresholds are programmable?
The STM32L475RGT7TR includes configurable brown-out reset (BOR) circuitry that monitors VDD and triggers a system reset if voltage drops below a selectable threshold. Four levels are available: 2.0V, 2.2V, 2.4V, and 2.6V, chosen via software configuration. The BOR operates independently of the main regulator, ensuring protection even during power-up transients. Hysteresis minimizes false triggering from brief dips. After a brown-out event, the MCU resets and restarts from the beginning of the application, preserving system state only if backup registers (VBAT domain) are used. This prevents corrupted operation during unstable supplies.
What considerations apply when interfacing the STM32L475RGT7TR with external memory via QSPI, and how does clock phase affect read performance?
The STM32L475RGT7TR supports Quad-SPI (QSPI) up to 80 MHz, enabling fast NOR flash or PSRAM access. When connecting external memory, match the clock polarity and phase (CPOL and CPHA) correctly to the slave’s timing requirements. Most modern serial memories default to Mode 0 (CPOL=0, CPHA=0), where data is sampled on the rising edge. Incorrect settings cause read failures. Also, enable continuous clock mode and use the memory-mapped addressing feature to eliminate CPU overhead. For best throughput, configure dummy cycles appropriately based on memory specifications—typically 8 dummy cycles at 80 MHz for DDR operation.
How does the STM32L475RGT7TR handle concurrent use of USB OTG and CANbus without causing bus contention or timing conflicts?
The STM32L475RGT7TR manages concurrent peripheral operation through independent clock domains and hardware arbitration. USB OTG uses a dedicated 48 MHz PLL clock derived from the main HSI or HSE, while CANbus runs off the APB1 clock (max 32 MHz). Since these clocks are asynchronous, neither interferes directly with the other. However, heavy USB traffic can temporarily saturate the AHB bus, delaying CAN message transmission slightly. To mitigate this, prioritize CAN interrupts and use DMA for both peripherals. Ensure sufficient buffer space in FIFO queues and avoid polling-intensive code paths during high-load scenarios.
What role does the watchdog timer (WDT) play in robust system recovery for the STM32L475RGT7TR, and how should it be configured for mission-critical applications?
The STM32L475RGT7TR includes an independent windowed watchdog (IWDG) powered by the LSI clock (~37 kHz), ensuring recovery even if the main clock fails. The WDT must be periodically refreshed within a defined window; failure to do so triggers a system reset. For critical systems, enable the early wakeup interrupt to detect anomalies before timeout. Configure the prescaler to balance responsiveness and false-trigger risk. Avoid disabling the WDT during debugging unless absolutely necessary. Combine with software monitoring routines to distinguish between transient faults and persistent hangs.
Can the STM32L475RGT7TR drive high-current loads directly, and what external circuitry is needed for GPIO switching power devices?
No, the STM32L475RGT7TR GPIO pins are limited to 8 mA output current with a maximum sink/source capability of ±15 mA. Driving inductive or capacitive loads beyond this requires external buffers. For relay coils or LEDs, use MOSFETs or transistors with base/gate resistors. For higher-power applications, connect loads through drivers like ULN2003 or dedicated ICs such as TPS2828. Always include flyback diodes across inductive loads to protect the MCU. Proper PCB trace sizing and decoupling near load connections are essential to maintain signal integrity and prevent voltage drops.
How does the STM32L475RGT7TR support real-time audio streaming via the Serial Audio Interface (SAI), and what sample rates are achievable?
The STM32L475RGT7TR features dual SAI interfaces capable of I2S, left/right-justified, and PCM audio formats. Each SAI block can operate at sample rates up to 96 kHz with 16-, 24-, or 32-bit resolution. Using the PLL to generate accurate master clocks, SAI supports asynchronous operation with external CODECs. For multi-channel audio, configure frame synchronization signals and use DMA to stream buffers continuously. Latency depends on buffer size and CPU load, but sub-5 ms is achievable with optimized ISRs. Ensure proper impedance matching and use shielded cables for digital audio lines to avoid EMI-induced glitches.
What steps are recommended before migrating an existing STM32F4-based design to the STM32L475RGT7TR to ensure compatibility and performance gains?
Transitioning from STM32F4 to STM32L475RGT7TR involves evaluating clock architecture, power management, and peripheral register mappings. The F4 lacks the ultra-low-power modes (Stop, Standby) and dynamic voltage scaling present in the L4 series. Begin by porting HAL code incrementally, leveraging ST’s migration tools. Verify timing-sensitive peripherals (PWM, ADC) against new constraints—especially reduced HCLK frequencies and altered DMA priorities. Take advantage of L4’s improved energy efficiency to lower overall system power. Test thoroughly under worst-case temperatures and voltages to validate robustness. Finally, recompile firmware with GCC or Keil targeting the Cortex-M4 FPU to unlock floating-point performance benefits.

Parts with Similar Specifications

The three parts on the right have similar specifications to STMicroelectronics STM32L475RGT7TR

Product Attribute STM32L475RGT6TR STM32L475RCT7 STM32L475VET6TR STM32L475RGT6
Part Number STM32L475RGT6TR STM32L475RCT7 STM32L475VET6TR STM32L475RGT6
Manufacturer STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Program Memory Size - - - -
RAM Size - - - -
Core Processor - - - -
EEPROM Size - - - -
Program Memory Type - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Base Product Number - DAC34H84 MAX500 ADS62P42
Core Size - - - -
Connectivity - - - -
Voltage - Supply (Vcc/Vdd) - - - -
Peripherals - - - -
Number of I/O - - - -
Oscillator Type - - - -
Speed - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Series - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Data Converters - - - -

STM32L475RGT7TR Datasheet PDF

Download STM32L475RGT7TR pdf datasheets and STMicroelectronics documentation for STM32L475RGT7TR - STMicroelectronics.

PCN Packaging
2.73KHz.pdf
PCN Design/Specification
STM32L4y Datasheet Chg 7/Feb/2020.pdf Mult Dev Material Chgs 28/Feb/2023.pdf
PCN Assembly/Origin
STM8/STM32 10/Mar/2020.pdf
HTML Datasheet
STM32L475xx Datasheet.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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STM32L475RGT7TR Image

STM32L475RGT7TR

STMicroelectronics
98D-STM32L475RGT7TR

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