STM32L451RET6 - Ultra-Low-Power Cortex-M4 MCU 512KB Flash | STMicroelectronics
MPN: STM32L451RET6 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.85 | $6.85 |
| 10 | $6.16 | $61.60 |
| 100 | $5.48 | $548.00 |
| 500 | $4.93 | $2,465.00 |
| 1,000 | $4.38 | $4,380.00 |
Drop-in alternatives for STM32L451RET6 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
STM32L452RET6
β Drop-Inβ 99,999 In Stock
$5.5 / Unit
View Datasheet βSTM32L451RCT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L462RET6
β Drop-Inπ Reference alternative (not in catalog)
STM32L476RET6
β Drop-Inπ Reference alternative (not in catalog)
GD32F450VET6
β Drop-Inπ Reference alternative (not in catalog)
STM32L451RET6 Maximum Ratings & Electrical Characteristics
| Core | Arm Cortex-M4 with FPU |
| Maximum Clock Frequency | 80 MHz |
| Flash Memory | 512 KB |
| SRAM | 160 KB |
| Supply Voltage Range | 1.71 V to 3.6 V |
| Package | 64-LQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40Β°C to +85Β°C |
| ADC Resolution | 12-bit |
| ADC Sample Rate | 5 MSPS |
| DAC Resolution | 12-bit |
| Number of I2C Interfaces | 4 |
| Number of SPI Interfaces | 3 |
| Number of USART/UART Interfaces | 3 USART + 1 UART + 1 LPUART |
| Number of Timers | 8 (including 2 advanced, 5 general-purpose, 2 basic) |
| RoHS Status | Compliant |
STM32L451RET6 Pin Configuration
| Pin 1 | VBAT β Backup battery supply for RTC and backup registers |
| Pin 2 | PC14/OSC32_IN β PC14 or 32.768 kHz oscillator input |
| Pin 3 | PC15/OSC32_OUT β PC15 or 32.768 kHz oscillator output |
| Pin 4 | PH0/OSC_IN β PH0 or main oscillator input |
| Pin 5 | PH1/OSC_OUT β PH1 or main oscillator output |
| Pin 6 | NRST β Reset (active low) |
| Pin 7 | PC0 β GPIO or ADC input |
| Pin 8 | PC1 β GPIO or ADC input |
| Pin 9 | PC2 β GPIO or ADC input |
| Pin 10 | PC3 β GPIO or ADC input |
| Pin 11 | VDD β Digital power supply |
| Pin 12 | VSS β Digital ground |
| Pin 13 | PC4 β GPIO or ADC input |
| Pin 14 | PC5 β GPIO or ADC input |
| Pin 15 | PB0 β GPIO or ADC input |
| Pin 16 | PB1 β GPIO or ADC input |
| Pin 17 | PB2 β GPIO |
| Pin 18 | PB10 β GPIO or I2C/SPI/UART |
| Pin 19 | PB11 β GPIO or I2C/SPI/UART |
| Pin 20 | VSS β Digital ground |
| Pin 21 | VDD β Digital power supply |
| Pin 22 | PB12 β GPIO or SPI |
| Pin 23 | PB13 β GPIO or SPI |
| Pin 24 | PB14 β GPIO or SPI |
| Pin 25 | PB15 β GPIO or SPI |
| Pin 26 | PC6 β GPIO or timer |
| Pin 27 | PC7 β GPIO or timer |
| Pin 28 | PC8 β GPIO or timer |
| Pin 29 | PC9 β GPIO or timer |
| Pin 30 | PA0 β GPIO or ADC/WKUP |
| Pin 31 | PA1 β GPIO or ADC |
| Pin 32 | PA2 β GPIO or USART |
| Pin 33 | PA3 β GPIO or USART |
| Pin 34 | VSS β Digital ground |
| Pin 35 | VREF+ β ADC reference voltage |
| Pin 36 | VDDA β Analog power supply |
| Pin 37 | PA4 β GPIO or DAC |
| Pin 38 | PA5 β GPIO or DAC |
| Pin 39 | PA6 β GPIO or ADC |
| Pin 40 | PA7 β GPIO or ADC |
| Pin 41 | PC10 β GPIO or USART |
| Pin 42 | PC11 β GPIO or USART |
| Pin 43 | PC12 β GPIO or USART |
| Pin 44 | PD2 β GPIO |
| Pin 45 | PB3 β GPIO or SPI |
| Pin 46 | PB4 β GPIO or SPI |
| Pin 47 | PB5 β GPIO or I2C |
| Pin 48 | PB6 β GPIO or I2C |
| Pin 49 | PB7 β GPIO or I2C |
| Pin 50 | BOOT0 β Boot mode selection |
| Pin 51 | PB8 β GPIO or I2C |
| Pin 52 | PB9 β GPIO or I2C |
| Pin 53 | VSS β Digital ground |
| Pin 54 | VDD β Digital power supply |
| Pin 55 | PA8 β GPIO or timer |
| Pin 56 | PA9 β GPIO or USART |
| Pin 57 | PA10 β GPIO or USART |
| Pin 58 | PA11 β GPIO or USB |
| Pin 59 | PA12 β GPIO or USB |
| Pin 60 | PA13 β SWDIO (Serial Wire Debug) |
| Pin 61 | PA14 β SWCLK (Serial Wire Clock) |
| Pin 62 | PA15 β GPIO or JTAG |
| Pin 63 | PC13 β GPIO or RTC |
| Pin 64 | PC14 β GPIO or RTC |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
STM32L451RET6 is suitable for 6 applications: Smart Meters, Wearable Health Monitors, Industrial Sensors, IoT Edge Nodes, Portable Instrumentation, Audio Processing.
Smart Meters
The STM32L451RET6 is ideal for smart meters due to its ultra-low-power modes, high-resolution ADC for accurate energy measurement, and multiple communication interfaces (UART, SPI, I2C) for data transmission. In a typical smart meter, the MCU reads current and voltage sensors via the ADC, calculates energy consumption, and communicates via a wireless module or PLC modem. Its low-power Stop mode allows the meter to operate for years on a battery, while the 80 MHz Cortex-M4 core handles complex metering algorithms. The 512 KB Flash provides ample space for firmware and calibration data, and the 160 KB SRAM supports real-time data processing. The device's robustness and wide operating temperature range make it suitable for outdoor installations.
Recommended
Wearable Health Monitors
The STM32L451RET6 is well-suited for wearable health monitors such as fitness trackers and heart rate monitors. Its ultra-low-power consumption (as low as 100 nA in Stop 2) extends battery life, while the integrated ADC and operational amplifier enable precise biosignal acquisition. The MCU can process ECG or PPG signals using the Cortex-M4 DSP instructions, and communicate results via BLE using an external module. The small 64-LQFP package fits compact PCB designs, and the wide supply voltage range allows direct battery operation. Designers can leverage the multiple timers for pulse generation and the DMA for efficient data transfer, reducing CPU load and power consumption.
Recommended
Industrial Sensors
In industrial settings, the STM32L451RET6 serves as the brain of smart sensors for monitoring temperature, pressure, or vibration. Its 12-bit ADC with 5 MSPS sampling rate captures high-speed sensor signals, while the multiple UART/SPI interfaces connect to industrial networks like Modbus or CAN. The MCU's robust design, with an operating temperature range of -40Β°C to +85Β°C, ensures reliable operation in harsh environments. The low-power modes allow battery-powered wireless sensors to run for extended periods. The 512 KB Flash enables storing calibration tables and logging data, and the hardware AES accelerator (on some variants) secures communication. The device's rich timer set supports PWM generation for actuator control, making it a versatile choice for industrial automation.
Recommended
IoT Edge Nodes
The STM32L451RET6 is an excellent choice for IoT edge nodes that require local processing and low power consumption. It can run lightweight machine learning models for anomaly detection using the Cortex-M4 DSP instructions, and communicate with the cloud via Wi-Fi or LoRa modules. The device's multiple low-power modes allow it to sleep between sensor readings, conserving battery. The integrated AES encryption (on some variants) secures data transmission. With 512 KB Flash and 160 KB SRAM, it can handle complex protocols like MQTT and TLS. The 64-pin LQFP package is easy to solder in production, and the wide supply voltage range accommodates various battery chemistries.
Recommended
Portable Instrumentation
The STM32L451RET6 is ideal for portable test and measurement equipment such as handheld multimeters, data loggers, and oscilloscopes. Its high-resolution ADC and DAC enable accurate signal generation and measurement, while the low-power modes extend battery life for field use. The MCU can drive a graphical LCD via SPI or parallel interface, and the multiple timers generate precise timing signals. The 512 KB Flash allows storing large data logs, and the USB interface (on some variants) enables easy data transfer to a PC. The device's small package and low power consumption make it perfect for battery-powered instruments that need to be compact and energy-efficient.
Recommended
Audio Processing
The STM32L451RET6 can be used in audio applications such as voice recorders, audio effects processors, and active noise cancellation. Its Cortex-M4 core with FPU and DSP instructions accelerates audio algorithms like filtering and FFT. The two 12-bit DACs can output analog audio, and the SAI interface connects to external audio codecs. The device's low power consumption is beneficial for battery-powered audio devices. The 512 KB Flash can store audio samples, and the 160 KB SRAM supports real-time processing. The DFSDM (digital filter for sigma-delta modulators) allows direct connection to MEMS microphones, simplifying the audio input path.
Recommended
Recommended Products Summary
Engineering reference data for STM32L451RET6 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32L452RET6 | STM32L451RCT6 | STM32L462RET6 | STM32L476RET6 | GD32F450VET6 |
|---|---|---|---|---|---|---|
| Package | 64-LQFP (10x10 mm) | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | GigaDevice |
| Core | Arm Cortex-M4 with FPU | Arm Cortex-M4 with FPU | Arm Cortex-M4 with FPU | Arm Cortex-M4 with FPU | Arm Cortex-M4 with FPU | Arm Cortex-M4 with FPU |
| Maximum Clock Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 200 MHz |
| Flash Memory | 512 KB | 512 KB | 256 KB | 512 KB | 512 KB | 512 KB |
| SRAM | 160 KB | 160 KB | 160 KB | 160 KB | 128 KB | 192 KB |
| Supply Voltage Range | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 2.6 V to 3.6 V |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| Security Features | None (basic) | TRNG, AES | None (basic) | TRNG, AES, USB | TRNG, AES | TRNG, AES |
Key Differentiators
- Ultra-low-power consumption with Stop 2 mode at 100 nA (vs STM32L476RET6)
- Higher SRAM capacity (160 KB) than STM32L476RET6 (vs STM32L476RET6)
- Pin-to-pin compatible with STM32L452RET6 but lower cost (vs STM32L452RET6)
Design Notes
Decouple each VDD pin with a 100 nF ceramic capacitor placed as close as possible to the pin. Additionally, place a 4.7 uF capacitor at the main power input. The VDDA pin must be connected to a clean analog supply, and VREF+ should be decoupled with a 1 uF capacitor for accurate ADC conversions. For battery-powered designs, use the low-power modes (Stop 2) to minimize current consumption.
For the 64-LQFP package, ensure proper solder paste stencil design to avoid bridging. The exposed pad (if present) should be connected to ground for thermal relief. Place the crystal oscillator (if used) close to the MCU with short traces and a ground guard ring to reduce noise. Keep high-speed communication lines (SPI, USART) away from analog traces to prevent crosstalk.
Do not exceed the absolute maximum ratings: VDD must not exceed 3.6 V, and GPIOs are 5V-tolerant but not for continuous high current. Ensure the BOOT0 pin is properly configured to avoid accidental boot from system memory. When using the ADC, avoid floating analog inputs; connect unused ADC channels to ground. Also, verify the clock configuration to avoid overclocking the core beyond 80 MHz.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified; for automotive, consider STM32L4 series with AEC-Q100 qualification.
