STMicroelectronics STM32L151RDT6TR

Overview

STM32L151RDT6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M3 microcontroller featuring 384 KB Flash, 48 KB SRAM, 12 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 targets battery-powered IoT sensor nodes requiring long runtime and integrated analog peripherals.

For engineers reviewing the STM32L151RDT6TR datasheet, STM32L151RDT6TR pinout, STM32L151RDT6TR application, or STM32L151RDT6TR equivalent, key selection criteria include standby current (305 nA), RTC-enabled Stop mode (1.15 µA), 102 5V-tolerant I/Os, and dual 12-bit DAC outputs - all critical for energy-constrained embedded control and data acquisition designs.

Technical Context

The device integrates a memory protection unit (MPU) and supports dynamic voltage scaling to optimize power vs. performance across Run, Low-power Run, Sleep, Stop, and Standby modes. Its clock system combines multiple internal oscillators (HSI 16 MHz ±1%, MSI 65 kHz–4.2 MHz, LSI 37 kHz) with external crystal support (1–24 MHz HSE, 32.768 kHz LSE) and a USB-capable PLL (48 MHz output).

Analog subsystem includes three operational amplifiers, two ultra-low-power comparators with window mode and wakeup capability, and dedicated hardware for capacitive touch sensing (up to 34 channels). The FSMC controller enables direct interfacing with external SRAM, PSRAM, and NOR Flash devices.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad - optimized for compact PCB layouts and thermal dissipation in sealed enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151RDT6TR, the STM32L431RCT6 offers superior compute density and lower leakage but sacrifices EEPROM integrity for Flash emulation, while the STM32L071RBT6 reduces feature set and cost at the expense of USB connectivity and analog channel count - making the L151 optimal for balanced ultra-low-power applications requiring robust nonvolatile storage and full-featured analog integration.

Availability

STM32L151RDT6TR is available at Aetrix Electronics and suitable for smart utility meters, wearable health monitors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply and long-term manufacturability.

Supply support for STM32L151RDT6TR 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-grade components.

The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, integrated analog peripherals, and industrial temperature resilience - with the L151RDT6TR representing the mid-range variant balancing memory, I/O count, and feature richness.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM32L151RDT6TR achieves a maximum CPU frequency of 32 MHz. At this speed, typical current consumption is 230 µA/MHz when executing code from Flash, resulting in ~7.4 mA total. This value assumes VDD = 3.3 V, ambient temperature = 25°C, and all peripherals disabled except core logic and Flash interface.

Does the device support hardware encryption or secure boot features?

No, the STM32L151RDT6TR does not include hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. Security relies on software-implemented algorithms and MPU-based memory isolation. For certified secure boot, consider STM32L5 or STM32H5 series devices with TrustZone and embedded secure elements.

Can the internal 12-bit DAC outputs drive standard analog loads directly?

Yes - both DAC channels include integrated output buffers capable of sourcing/sinking ±5 mA with rail-to-rail swing. They can directly drive 1 kΩ loads (e.g., op-amp inputs, LED bias circuits, or simple actuator references) without external amplification, though output impedance rises above 10 kΩ loads.

Is the LQFP64 package RoHS-compliant and lead-free?

Yes, the STM32L151RDT6TR in LQFP64 packaging is fully RoHS-compliant and lead-free per EU Directive 2011/65/EU and STMicroelectronics' environmental policy. The "TR" suffix denotes tape-and-reel packaging compatible with automated SMT assembly processes.