STMicroelectronics STM8L151F3U6DTR

Overview

STM8L151F3U6DTR from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 8 KB Flash, 256-byte data EEPROM with ECC, RTC, 12-bit ADC (up to 1 Msps), two ultra-low-power comparators, and multiple timers including TIM2/TIM3 (16-bit) and TIM4 (8-bit). It operates from 1.65–3.6 V across –40 to +85 °C and supports capacitive touch sensing for battery-powered sensor nodes.

For engineers reviewing the STM8L151F3U6DTR datasheet, STM8L151F3U6DTR pinout, STM8L151F3U6DTR application, or STM8L151F3U6DTR equivalent, key selection criteria include low-power mode timing (5 µs Halt wakeup), RTC digital calibration (±0.5 ppm), I/O leakage (50 nA), and UFQFPN20 package compatibility with space-constrained designs.

Technical Context

The STM8L151F3U6DTR implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates three oscillators: factory-trimmed 16 MHz RC, 38 kHz low-consumption RC, and external 32 kHz crystal support with LSE security system.

Power management includes five configurable low-power modes (Wait, Low-power Run, Active-halt with RTC, Halt), programmable voltage detector (PVD), and BOR with five selectable thresholds. The RTC provides BCD calendar, alarm interrupt, and auto-wakeup from Halt via periodic interrupt.

Key Specifications

Pinout & Package

STM8L151F3U6DTR is housed in a 20-pin UFQFPN (3 × 3 mm, 0.5 mm pitch) package with exposed thermal pad. This compact, lead-free, RoHS-compliant package supports high-density PCB layouts and efficient thermal dissipation in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L151F3U6DTR, STM8L152C6T6 offers enhanced security and I/O but increases board area, while STM32L011K4U6 delivers higher compute throughput at the expense of integrated analog features and EEPROM - making STM8L151F3U6DTR optimal for cost-sensitive, space-constrained, analog-rich ultra-low-power designs.

Availability

STM8L151F3U6DTR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial control panels, and portable medical devices requiring stable component supply and long-term lifecycle assurance.

Supply support for STM8L151F3U6DTR 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 analog products for industrial, automotive, and consumer markets.

The STM8L ultra-low-power MCU product line targets battery-operated and energy-harvesting applications where sub-µA sleep current, fast wake-up, and integrated analog peripherals reduce system complexity and bill-of-materials cost.

FAQ

What is the maximum operating frequency and core architecture of the STM8L151F3U6DTR?

The STM8L151F3U6DTR features an 8-bit STM8 core with Harvard architecture and 3-stage pipeline, achieving a maximum operating frequency of 16 MHz and delivering 16 CISC MIPS peak performance. It uses a single-cycle instruction set optimized for ultra-low-power execution, with all instructions executing in 1–4 cycles depending on addressing mode.

Does the STM8L151F3U6DTR support capacitive touch sensing, and how many channels are available?

Yes, the STM8L151F3U6DTR supports up to 20 capacitive sensing channels using its built-in touch sensing controller. It natively handles touchkey, proximity, linear, and rotary touch configurations without external components, leveraging dedicated hardware for charge-transfer measurement and noise immunity filtering.

What are the key low-power characteristics that differentiate this MCU in battery-operated applications?

This MCU achieves 50 nA I/O leakage in Halt mode and wakes up in just 5 µs, enabling multi-year battery life in intermittent-sensing applications. Its five low-power modes-including Active-halt with RTC-allow precise trade-offs between responsiveness and energy consumption, while the 38 kHz low-consumption RC oscillator consumes only 170 nA typical during RTC operation.

Is the STM8L151F3U6DTR pin-compatible with other members of the STM8L151 family?

No - the STM8L151F3U6DTR uses the UFQFPN20 package (3×3 mm), whereas other variants like STM8L151C3 use LQFP48 or UFQFPN32. Pin mapping differs significantly across packages; for example, PA0 in UFQFPN20 serves as both GPIO and high-sink LED driver, while its function and location vary in larger packages. Migration requires PCB redesign.