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Contents

Pinout
Key specifications
CAD (KiCad official)
Provenance

README

markdown

STM8L101F3U6TR

STMicroelectronics · Microcontrollers (MCU/MPU/SOC) · UFQFPN-20(3x3)

STM8L101F3U6TR from STMicroelectronics, in a UFQFPN-20(3x3). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	NRST/PA1	bidirectional	Reset input with internal pull-up (30-60 kΩ); pulses ≤50 ns filtered; after reset release can be reconfigured as PA1 push-pull output only (open-drain and input modes are not available per RM0013).
2	PA2	bidirectional	General-purpose bidirectional I/O on Port A2 with programmable weak pull-up (30-60 kΩ), 20 mA high sink/source capability, and external-interrupt capability.
3	PA3	bidirectional	General-purpose bidirectional I/O on Port A3 with programmable weak pull-up (30-60 kΩ), 20 mA high sink/source capability, and external-interrupt capability.
4	VSS	power_in	Ground reference for all internal and I/O circuitry; maximum total sink current 80 mA.
5	VDD	power_in	Main power supply, 1.65 V to 3.6 V operating range; maximum total source current 80 mA.
6	PD0/TIM3_CH2/COMP1_CH3	bidirectional	General-purpose bidirectional I/O on Port D0 with 20 mA high sink/source capability; alternate functions: Timer 3 channel 2 (output compare/PWM) and Comparator 1 analog input channel 3.
7	PB0/TIM2_CH1/COMP1_CH1	bidirectional	General-purpose bidirectional I/O on Port B0 (pull-up active during reset phase, input floating after reset release) with 20 mA high sink/source; alternate functions: Timer 2 channel 1 and Comparator 1 analog input channel 1.
8	PB1/TIM3_CH1/COMP1_CH2	bidirectional	General-purpose bidirectional I/O on Port B1 with 20 mA high sink/source capability; alternate functions: Timer 3 channel 1 and Comparator 1 analog input channel 2.
9	PB2/TIM2_CH2/COMP2_CH1	bidirectional	General-purpose bidirectional I/O on Port B2 with 20 mA high sink/source capability; alternate functions: Timer 2 channel 2 and Comparator 2 analog input channel 1.
10	PB3/TIM2_ETR/COMP2_CH2	bidirectional	General-purpose bidirectional I/O on Port B3 with 20 mA high sink/source capability; alternate functions: Timer 2 external trigger input and Comparator 2 analog input channel 2.
11	PB4/SPI_NSS	bidirectional	General-purpose bidirectional I/O on Port B4 (pull-up active during reset phase, input floating after reset release) with 20 mA high sink/source; alternate function: SPI master/slave select.
12	PB5/SPI_SCK	bidirectional	General-purpose bidirectional I/O on Port B5 with 20 mA high sink/source; alternate function: SPI clock up to 8 MHz in master or slave mode.
13	PB6/SPI_MOSI	bidirectional	General-purpose bidirectional I/O on Port B6 with 20 mA high sink/source; alternate function: SPI master-out/slave-in data line.
14	PB7/SPI_MISO	bidirectional	General-purpose bidirectional I/O on Port B7 with 20 mA high sink/source; alternate function: SPI master-in/slave-out data line.
15	PC0/I2C_SDA	bidirectional	General-purpose bidirectional I/O on Port C0 with true open-drain output only (no P-buffer, no weak pull-up, no protection diode to VDD); alternate function: I2C SDA supporting standard (100 kHz) and fast (400 kHz) modes.
16	PC1/I2C_SCL	bidirectional	General-purpose bidirectional I/O on Port C1 with true open-drain output only (no P-buffer, no weak pull-up, no protection diode to VDD); alternate function: I2C SCL supporting standard (100 kHz) and fast (400 kHz) modes.
17	PC2/USART_RX	bidirectional	General-purpose bidirectional I/O on Port C2 with 20 mA high sink/source; alternate function: USART receive with fractional baud rate generator.
18	PC3/USART_TX	bidirectional	General-purpose bidirectional I/O on Port C3 with 20 mA high sink/source; alternate function: USART transmit with fractional baud rate generator.
19	PC4/USART_CK/CCO	bidirectional	General-purpose bidirectional I/O on Port C4 with 20 mA high sink/source; alternate functions: USART synchronous clock output and configurable clock output (CCO).
20	PA0/SWIM/BEEP/IR_TIM	bidirectional	Port A0 held in input pull-up during reset and after reset release; provides SWIM single-wire debug interface, beeper output (1/2/4 kHz), and infrared timer output with high-sink LED driver capability (VOL ≤ 0.9 V at IIO = 20 mA, VDD = 2.0 V).

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	UFQFPN-20(3x3)
Category	Embedded Processors & Controllers
Pins	20

CAD (KiCad official)

Symbol: STM8L101F3U6TR
Footprint: Package_DFN_QFN:ST_UFQFPN-20_3x3mm_P0.5mm
3D model: UFQFPN-20(3x3) (KiCad packages3D, STEP)
3D model files: stm8l101f3u6tr-etched.step / stm8l101f3u6tr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); stm8l101f3u6tr.step / stm8l101f3u6tr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: STMicroelectronics datasheet (88 pp, sha256 c8e0b0d1f3c75a46, retrieved 2026-09-26, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-4-6 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF