STMicroelectronics STM8L101F3U6TR

Overview

STM8L101F3U6TR from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 8 Kbytes Flash, 1.5 Kbytes RAM, and integrated peripherals including two 16-bit timers, USART, SPI, I²C, two comparators, and infrared (IR) interface. It operates from 1.65 V to 3.6 V, supports -40 to 85 °C temperature range, and achieves 150 µA/MHz dynamic run current - ideal for battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L101F3U6TR datasheet, STM8L101F3U6TR pinout, STM8L101F3U6TR application, or STM8L101F3U6TR equivalent, key selection criteria include ultra-low-power Halt mode (0.3 µA), SWIM debug interface, 20-pin UFQFPN package compatibility, and IR remote control capability in space-constrained designs.

Technical Context

The STM8L101F3U6TR implements the STM8 CISC core delivering up to 16 MIPS at 16 MHz, with dual internal oscillators: a 16 MHz high-speed RC (HSI) for active operation and a 38 kHz low-power RC (LSI) for independent watchdog and auto-wakeup unit (AWU) timing. Its nested interrupt controller supports 29 external sources with software-configurable priority.

Memory architecture includes ECC-protected Flash with in-application programming, 2 Kbytes of data EEPROM, and flexible read/write protection. Power management integrates three low-power modes - Wait, Active-halt, and Halt - each with distinct clock gating and peripheral retention strategies to optimize energy per task.

Key Specifications

Pinout & Package

STM8L101F3U6TR uses the 20-pin Ultra Thin Fine Pitch Quad Flat No-lead (UFQFPN20) package, measuring 3 mm × 3 mm with 0.5 mm lead pitch and exposed thermal pad. This compact, lead-free package supports automated reflow assembly and provides robust thermal performance for continuous low-duty-cycle operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power 8-bit microcontroller applications.

Compared with STM8L051F3P6 and EFM8LB12F32ES1-QFP24, the STM8L101F3U6TR uniquely balances minimal footprint (20-pin UFQFPN), hardware IR support, and proven ultra-low-power operation - making it optimal where IR transmission and board area are critical constraints.

Availability

STM8L101F3U6TR is available at Aetrix Electronics and suitable for battery-powered sensor nodes, portable medical devices, infrared remote transmitters, and industrial control panels requiring stable component supply and long-term manufacturability.

Supply support for STM8L101F3U6TR 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 STM8L series targets ultra-low-power embedded applications, emphasizing energy efficiency, small form factor, and integration of essential peripherals - specifically engineered for extended battery life in consumer, medical, and industrial edge devices.

FAQ

Does STM8L101F3U6TR support in-circuit programming?

Yes, it supports in-circuit programming via the Single Wire Interface Module (SWIM) using a standard ST-LINK/V2 debugger. No bootloader is required - the SWIM interface allows full Flash and EEPROM erase/write operations directly through the SWIM pin, even during live application execution.

What is the maximum operating frequency and how is it achieved?

The STM8L101F3U6TR achieves up to 16 MHz CPU frequency using its internal 16 MHz high-speed RC oscillator (HSI), which requires no external crystal. The HSI is factory-trimmed to ±1% accuracy at 3 V and 25 °C, and remains stable across voltage (1.65–3.6 V) and temperature (-40 to 85 °C) ranges per datasheet specifications.

Can PA0 drive an infrared LED directly without external components?

Yes, PA0 is configured as a high-sink LED driver with up to 20 mA output capability and integrated IR modulation logic. When enabled, it generates precise 30–56 kHz carrier frequencies synchronized to timer events - eliminating external transistors, drivers, or encoder ICs in remote control designs.

Is the 2 Kbytes of data EEPROM truly separate from program Flash memory?

Yes, the 2 Kbytes of data EEPROM is physically partitioned from the 8 Kbytes of main Flash program memory and features independent write/erase cycles, dedicated ECC circuitry, and separate lock bits. It supports byte-level writes and 100,000+ endurance cycles, verified in ST's characterization testing per DocID15275 Rev 16.