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STMicroelectronics STM8L151K4U6 — Microcontrollers & Processors (MCU / MPU / DSP)

STM8L151K4U6 8-bit MCU, STM8L EnergyLite, 16 MHz

MPNSTM8L151K4U6
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STMicroelectronics STM8L151K4U6, STM8L EnergyLite 8-bit MCU, 16 MHz, 16 KB Flash, 2K x 8 RAM, 1K x 8 EEPROM, 1.8V-3.6V, -40°C to 85°C, 32-UFQFPN.

$1.3245Ref. price · indicative, final on quote
STMicroelectronics STM8L151K4U6 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STM8L151K4U6 specifications
ParameterValue
SeriesSTM8L EnergyLite
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.8V ~ 3.6V
Operating temperature-40°C ~ 85°C (TA)
Speed16MHz
PackageTray
RAM size2K x 8
Core size8-Bit
EEPROM size1K x 8
PeripheralsBrown-out Detect/Reset, DMA, IR, POR, PWM, WDT
ConnectivityI²C, IrDA, SPI, UART/USART
Number of i (O)30
Core processorSTM8
Case32-UFQFN Exposed Pad
Data convertersA/D 22x12b; D/A 1x12b
Program memory size16KB (16K x 8)

Product details

What this STM8L151K4U6 brings to the board

The STMicroelectronics STM8L151K4U6 is an 8-bit microcontroller from the STM8L EnergyLite family, built around the STM8 core and clocked at 16 MHz. It packs 16 KB of Flash program memory, 2K x 8 of RAM, and 1K x 8 of EEPROM.

16 MHz core and the peripheral set

Sixteen megahertz is a comfortable pace for an 8-bit core handling 12-bit ADC conversions (22 channels), a 12-bit DAC, PWM generation, and DMA transfers without stalling.

It comes in a 32-UFQFN with an exposed pad (5x5 mm body — the supplier device package is 32-UFQFPN). Surface-mount only — this is not a socketed part, so plan for reflow or hot-air rework. The 30 I/O lines give you plenty of headroom for a keypad matrix, LED indicators, and a few spare GPIOs for board-level glue logic.

For dual-sourcing or a drop-in with more memory, the STM8L151K6U6 is the same footprint and peripheral set but with 32 KB of Flash instead of 16 KB — worth a look if the firmware is likely to grow.

Frequently asked questions

What is the difference between STM8L151K4U6 and STM8L151K6U6?

The STM8L151K6U6 doubles the program memory to 32 KB of Flash while keeping the same 32-UFQFPN footprint, 16 MHz core, peripheral set, and supply range. If your firmware fits in 16 KB, the K4U6 is the cost-optimized pick; if you expect the code to grow, the K6U6 is a pin-compatible upgrade path.

Is STM8L151K4U6 RoHS compliant?

Yes, the STM8L151K4U6 is RoHS compliant — it ships as a lead-free, halogen-free device per ST's standard environmental compliance for the STM8L EnergyLite series.