STM32L162RET6 - Ultra-Low-Power ARM Cortex-M3 MCU | STMicroelectronics
MPN: STM32L162RET6 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.44 | $5,440.00 |
STM32L162RET6 Overview
An ultra-low-power microcontroller (MCU) is a type of embedded processor optimized for minimal power consumption, often featuring multiple low-power modes, low supply voltages, and efficient clock management. These MCUs are essential in battery-operated devices, IoT sensors, and portable medical equipment where extending battery life is critical. The STM32L1 series sits within the broader STM32 family, which spans from low-power to high-performance Cortex-M based MCUs, and is part of the ARM Cortex-M ecosystem.
Key features of the STM32L162RET6 include a 32 MHz ARM Cortex-M3 core with memory protection unit (MPU), 512 KB Flash, 80 KB SRAM, and a comprehensive set of peripherals: USB 2.0 full-speed device, LCD controller supporting up to 8x40 segments, AES-128 hardware encryption, 12-bit ADC, 12-bit DAC, multiple timers, and communication interfaces (USART, SPI, I2C). It operates from 1.8V to 3.6V supply and features several low-power modes: Sleep, Low-power Run, Low-power Sleep, Stop with RTC, and Standby, with current consumption as low as 0.3 uA in Standby mode.
The STM32L162RET6 is built on ST's ultra-low-power technology, which combines a low-leakage process with dynamic voltage scaling and a flexible clock gating architecture. This enables the MCU to achieve industry-leading energy efficiency, with a typical active-mode current of 230 uA/MHz. The integrated AES-128 encryption engine provides hardware-accelerated security for data protection, making it suitable for secure communication and authentication applications.
Typical applications include smart meters, medical devices (e.g., glucose monitors, hearing aids), industrial sensors, IoT nodes, and portable consumer electronics. The LCD controller and USB interface make it ideal for human-machine interface (HMI) applications, while the AES engine supports secure data logging and communication.
When designing with this device, pay attention to the power supply decoupling: place a 100 nF capacitor close to each VDD pin and a 4.7 uF capacitor at the main supply. Use the low-power modes effectively by configuring the RTC and wake-up sources to minimize average current consumption. The STM32L162RET6 is available in LQFP64 package, which is pin-compatible with other STM32L1 series devices in the same package, allowing easy migration.
Drop-in alternatives for STM32L162RET6 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STM32L162RET6 (same form factor and footprint) — differing in Communication Interfaces, Flash Memory, Package, SRAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
STM32L162RCT6
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.8636 / Unit
View Datasheet →STM32L152RET6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32L151RET6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32L162RDT6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32L162R8T6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32L162RET6 Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M3 |
| Max Clock Frequency | 32 MHz |
| Flash Memory | 512 KB |
| SRAM | 80 KB |
| Supply Voltage | 1.8 V to 3.6 V |
| Package | LQFP64 (10x10 mm) |
| Operating Temperature | -40C to +85C |
| GPIO Pins | 51 |
| ADC | 12-bit, 16 channels |
| DAC | 12-bit, 2 channels |
| Timers | 8 (16-bit and 32-bit) |
| Communication Interfaces | USB 2.0 FS, 3x USART, 2x SPI, 2x I2C |
| LCD Controller | 8x40 segments |
| AES Encryption | 128-bit hardware |
| Standby Current | 0.3 uA |
| Active Current | 230 uA/MHz |
| RoHS Status | Compliant |
STM32L162RET6 Pin Configuration
| Pin 1 | VBAT — Battery backup supply |
| Pin 2 | PC13 — GPIO / RTC tamper |
| Pin 3 | PC14 — GPIO / OSC32_IN |
| Pin 4 | PC15 — GPIO / OSC32_OUT |
| Pin 5 | PF0 — GPIO / OSC_IN |
| Pin 6 | PF1 — GPIO / OSC_OUT |
| Pin 7 | NRST — Reset (active low) |
| Pin 8 | VSSA — Analog ground |
| Pin 9 | VDDA — Analog power supply |
| Pin 10 | PA0 — GPIO / ADC_IN0 |
| Pin 11 | PA1 — GPIO / ADC_IN1 |
| Pin 12 | PA2 — GPIO / USART2_TX |
| Pin 13 | PA3 — GPIO / USART2_RX |
| Pin 14 | PA4 — GPIO / SPI1_NSS |
| Pin 15 | PA5 — GPIO / SPI1_SCK |
| Pin 16 | PA6 — GPIO / SPI1_MISO |
| Pin 17 | PA7 — GPIO / SPI1_MOSI |
| Pin 18 | PB0 — GPIO / ADC_IN8 |
| Pin 19 | PB1 — GPIO / ADC_IN9 |
| Pin 20 | PB2 — GPIO / BOOT1 |
| Pin 21 | PB10 — GPIO / I2C2_SCL |
| Pin 22 | PB11 — GPIO / I2C2_SDA |
| Pin 23 | PB12 — GPIO / SPI2_NSS |
| Pin 24 | PB13 — GPIO / SPI2_SCK |
| Pin 25 | PB14 — GPIO / SPI2_MISO |
| Pin 26 | PB15 — GPIO / SPI2_MOSI |
| Pin 27 | PC6 — GPIO / USART6_TX |
| Pin 28 | PC7 — GPIO / USART6_RX |
| Pin 29 | PC8 — GPIO / USART6_CK |
| Pin 30 | PC9 — GPIO / USB_DM |
| Pin 31 | PA8 — GPIO / USB_DP |
| Pin 32 | PA9 — GPIO / USART1_TX |
| Pin 33 | PA10 — GPIO / USART1_RX |
| Pin 34 | PA11 — GPIO / USART1_CTS |
| Pin 35 | PA12 — GPIO / USART1_RTS |
| Pin 36 | PA13 — GPIO / SWDIO |
| Pin 37 | PA14 — GPIO / SWCLK |
| Pin 38 | PA15 — GPIO / JTDI |
| Pin 39 | PB3 — GPIO / JTDO |
| Pin 40 | PB4 — GPIO / NJTRST |
| Pin 41 | PB5 — GPIO / I2C1_SMBA |
| Pin 42 | PB6 — GPIO / I2C1_SCL |
| Pin 43 | PB7 — GPIO / I2C1_SDA |
| Pin 44 | PB8 — GPIO / I2C1_SCL |
| Pin 45 | PB9 — GPIO / I2C1_SDA |
| Pin 46 | VSS — Ground |
| Pin 47 | VDD — Power supply |
| Pin 48 | PC10 — GPIO / USART4_TX |
| Pin 49 | PC11 — GPIO / USART4_RX |
| Pin 50 | PC12 — GPIO / USART5_TX |
| Pin 51 | PD2 — GPIO / USART5_RX |
| Pin 52 | VSS — Ground |
| Pin 53 | VDD — Power supply |
| Pin 54 | PC0 — GPIO / ADC_IN10 |
| Pin 55 | PC1 — GPIO / ADC_IN11 |
| Pin 56 | PC2 — GPIO / ADC_IN12 |
| Pin 57 | PC3 — GPIO / ADC_IN13 |
| Pin 58 | PC4 — GPIO / ADC_IN14 |
| Pin 59 | PC5 — GPIO / ADC_IN15 |
| Pin 60 | PB8 — GPIO / I2C1_SCL |
| Pin 61 | PB9 — GPIO / I2C1_SDA |
| Pin 62 | VSS — Ground |
| Pin 63 | VDD — Power supply |
| Pin 64 | VDD — Power supply |
Typical Applications
STM32L162RET6 is suitable for 6 applications: Smart Meters, Medical Devices, Industrial Sensors, IoT Nodes, Portable Consumer Electronics, Human-Machine Interface (HMI).
Smart Meters
The STM32L162RET6 is ideal for smart meters due to its ultra-low power consumption, integrated LCD controller for display, and AES encryption for secure data transmission. In a typical smart meter, the MCU reads sensor data, processes it, and communicates via wireless or wired interfaces. The low standby current (0.3 uA) ensures long battery life, while the 32 MHz Cortex-M3 core handles complex metering algorithms. The LCD controller directly drives the display, reducing external components. The AES engine secures communication with the utility network, protecting against tampering. Compared to other MCUs, the STM32L162RET6 offers a balance of performance, power, and security, making it a preferred choice for metering applications.
Recommended
Medical Devices
The STM32L162RET6 is well-suited for portable medical devices such as glucose monitors and pulse oximeters. Its ultra-low power consumption extends battery life, critical for wearable health monitors. The integrated 12-bit ADC accurately samples sensor signals, while the USB interface enables data transfer to a host for analysis. The AES encryption ensures patient data security. In a glucose monitor, the MCU reads the sensor, processes the reading, and displays it on an LCD. The low-power modes allow the device to run for months on a coin cell battery. The STM32L162RET6's small LQFP64 package fits compact designs, and its wide supply voltage range accommodates battery voltage variations.
Recommended
Industrial Sensors
The STM32L162RET6 is used in industrial sensors for monitoring temperature, pressure, and flow. Its robust operating temperature range (-40C to +85C) and low power consumption make it suitable for remote and battery-powered sensors. The multiple communication interfaces (USART, SPI, I2C) allow easy integration with industrial networks. The 12-bit ADC provides accurate sensor readings, and the AES encryption secures data in critical infrastructure. In a typical industrial sensor node, the MCU periodically wakes from sleep, reads the sensor, and transmits data via a wireless module. The low standby current ensures long battery life, reducing maintenance costs. The STM32L162RET6's performance is sufficient for real-time processing, while its power efficiency is a key advantage.
Recommended
IoT Nodes
The STM32L162RET6 is a popular choice for IoT nodes due to its ultra-low power consumption and integrated security features. In an IoT node, the MCU collects data from sensors, processes it, and transmits it to a gateway via wireless protocols like LoRa, Zigbee, or BLE. The AES encryption ensures secure communication, and the low-power modes enable battery-powered operation for years. The STM32L162RET6's 512 KB Flash provides ample space for firmware and data logging. Its multiple communication interfaces allow connection to various sensors and radios. Compared to other MCUs, the STM32L162RET6 offers a good balance of performance, power, and security, making it ideal for edge devices in smart agriculture, smart city, and industrial IoT.
Recommended
Portable Consumer Electronics
The STM32L162RET6 is used in portable consumer electronics such as fitness trackers, smartwatches, and remote controls. Its ultra-low power consumption is essential for battery-powered devices that need to last weeks or months. The integrated LCD controller can drive small displays, and the USB interface allows charging and data transfer. The AES encryption protects user data. In a fitness tracker, the MCU reads accelerometer data, processes steps, and displays them on an LCD. The low-power modes allow the device to run for weeks on a small battery. The STM32L162RET6's small package and rich peripheral set make it a versatile choice for consumer devices.
Recommended
Human-Machine Interface (HMI)
The STM32L162RET6 is suitable for HMI applications such as control panels and smart home displays. Its integrated LCD controller supports up to 8x40 segments, enabling direct drive of alphanumeric displays without external drivers. The USB interface allows connection to a host for configuration. The AES encryption secures communication in smart home systems. In a typical HMI, the MCU reads user inputs from buttons or touch sensors, updates the display, and communicates with other devices. The low-power modes allow the device to remain in standby when not in use, saving energy. The STM32L162RET6's rich peripheral set and low power consumption make it an excellent choice for HMI applications.
Recommended
Recommended Products Summary
Engineering reference data for STM32L162RET6 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32L162RCT6 | STM32L152RET6 | STM32L151RET6 | STM32L162RDT6 | STM32L162R8T6 |
|---|---|---|---|---|---|---|
| Package | LQFP64 | LQFP64 | LQFP64 | LQFP64 | LQFP64 | LQFP64 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Flash Memory | 512 KB | 256 KB | 512 KB | 512 KB | 384 KB | 128 KB |
| SRAM | 80 KB | 32 KB | 80 KB | 80 KB | 48 KB | 16 KB |
| AES Encryption | Yes | Yes | No | No | Yes | Yes |
| LCD Controller | Yes | Yes | Yes | No | Yes | Yes |
| Max Clock Frequency | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Standby Current | 0.3 uA | 0.3 uA | 0.3 uA | 0.3 uA | 0.3 uA | 0.3 uA |
Key Differentiators
- Hardware AES-128 encryption (vs STM32L152RET6)
- 512 KB Flash memory (vs STM32L162RCT6)
- Integrated LCD controller (vs STM32L151RET6)
Design Notes
For ultra-low-power operation, use the low-power modes effectively. In Standby mode, the STM32L162RET6 consumes only 0.3 uA. To achieve this, disable the RTC and all peripherals, and configure the wake-up sources properly. Use the Low-power Run mode for tasks that require the CPU but at reduced clock speed to minimize current. Ensure the supply voltage is within 1.8V to 3.6V and decouple each VDD pin with a 100 nF capacitor and a 4.7 uF bulk capacitor.
Place decoupling capacitors close to the power pins. For the LQFP64 package, place a 100 nF capacitor near each VDD/VSS pair and a 4.7 uF capacitor at the main supply entry. Keep the analog supply (VDDA) separate from digital supply with a ferrite bead to reduce noise. Ensure the ground plane is continuous under the MCU to minimize EMI and provide a low-impedance return path.
Do not exceed the absolute maximum ratings, especially the supply voltage (3.6V) and the voltage on any pin (VDD+0.3V). When using the ADC, ensure the analog reference voltage is stable and filtered. For USB operation, use a 1.5 kOhm pull-up on the D+ line and ensure the VBUS is within spec. Also, configure the clock source correctly; the internal HSI RC oscillator is less accurate than an external crystal, which may be required for USB or precise timing.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified; for automotive, consider STM32L1 series with AEC-Q100 option.
