STMicroelectronics STM32L151ZET6

Overview

STM32L151ZET6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M3 microcontroller featuring 512 KB Flash, 80 KB SRAM, 16 KB EEPROM with ECC, USB 2.0 interface, and 12-bit ADC (1 Msps, up to 40 channels). It operates from 1.65 V to 3.6 V across –40 °C to +105 °C and delivers 195 µA/MHz in Run mode and as low as 560 nA in Stop mode - ideal for battery-powered industrial sensors and portable medical devices.

For engineers reviewing the STM32L151ZET6 datasheet, STM32L151ZET6 pinout, STM32L151ZET6 application, or STM32L151ZET6 equivalent, key selection considerations include its dual 12-bit DACs with output buffers, two operational amplifiers, ultra-low-power comparators with wake-up capability, and support for capacitive touch sensing across up to 34 channels.

Technical Context

The STM32L151ZET6 integrates an Arm Cortex-M3 core running at up to 32 MHz with MPU, dynamic voltage scaling, and five low-power modes (Run, Sleep, Low-power Run/Sleep, Stop, Standby) optimized for energy-constrained applications. Its clock system includes multiple oscillators: 1–24 MHz HSE, 32 kHz LSE for RTC, 16 MHz HSI (±1%), 37 kHz LSI, and 65 kHz–4.2 MHz MSI.

Analog subsystem comprises two rail-to-rail op-amps, two ultra-low-power comparators (with window mode), a 12-bit ADC with 40 input channels and internal temperature sensor/VREFINT, and two buffered 12-bit DACs - all functional down to 1.8 V supply. USB 2.0 FS interface uses an internal 48 MHz PLL and supports device mode only.

Key Specifications

Pinout & Package

LQFP144 package (20 × 20 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant, industrial temperature grade (–40 °C to +105 °C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power microcontroller applications.

Compared with STM32L151ZET6, STM32L432KCU6 trades EEPROM and ultra-low-power analog features for FPU and security extensions, while STM32L073RZT6 reduces feature count and eliminates USB to achieve lower cost and marginally lower Stop current - neither matches the balanced ultra-low-power analog + USB + EEPROM integration of the L151ZET6.

Availability

STM32L151ZET6 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart utility meters, and asset tracking beacons requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for STM32L151ZET6 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, sensors, and automotive semiconductors.

The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, integrated analog peripherals, and industrial-grade reliability - specifically engineered for energy-constrained IoT edge nodes and portable instrumentation.

FAQ

Does STM32L151ZET6 support LCD driving?

No. The STM32L151ZET6 belongs to the STM32L151xE line, which explicitly excludes the integrated LCD controller - that feature is reserved for STM32L152xE variants per DS10002 Rev 10 Section 3.9 and Table 2. This part offers full analog and communication peripherals but no segment or COM/SEG drivers.

What is the maximum operating frequency with USB enabled?

The STM32L151ZET6 achieves 32 MHz CPU operation with USB active, using its internal 48 MHz PLL derived from the 16 MHz HSI or external HSE. USB Full-Speed functionality requires the PLL to be configured for 48 MHz, and the APB1 bus (which hosts USB) must run at ≤ 48 MHz - both constraints are satisfied within the 32 MHz CPU limit.

How many I/O pins are 5V tolerant?

102 of the 116 I/O pins on the STM32L151ZET6 are 5V tolerant, as confirmed in the "Features" section of DS10002 Rev 10 (p.1). This applies to all GPIOs except those dedicated to USB (PA11/PA12), oscillator inputs (PC14/PC15), and BOOT0 - enabling direct interfacing with legacy 5V logic without level shifters.

Is the 16 KB EEPROM truly erasable at byte level?

Yes. The 16 KB data EEPROM supports byte, half-word, and word erase/write operations with hardware ECC, endurance rated for 100,000 cycles and data retention of 15 years at 85 °C per DS10002 Rev 10 Section 3.7 and Table 35. It is mapped into the memory space and accessed via dedicated PEC (Program/Erase Controller) registers, not emulated in Flash.