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STMicroelectronics STM8AL3L66TCY — Microcontrollers & Processors (MCU / MPU / DSP)

STM8AL3L66TCY 8-bit MCU, 16 MHz, AEC-Q100, 32 KB Flash

MPNSTM8AL3L66TCY
NRND

STMicroelectronics STM8AL3L66TCY, Automotive AEC-Q100, 8-bit STM8A core MCU, 16 MHz, 32 KB Flash, 2K x 8 RAM, 1K x 8 EEPROM, 29 I/O, 32-LQFP, -40°C to 125°C.

$4.2000Ref. price · indicative, final on quote
STMicroelectronics STM8AL3L66TCY datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STM8AL3L66TCY specifications
ParameterValue
SeriesAutomotive, AEC-Q100, STM8A
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.65V ~ 3.6V
Operating temperature-40°C~125°C(TA)
Speed16MHz
PackageTray
RAM size2K x 8
Core size8-Bit
EEPROM size1K x 8
PeripheralsBrown-out Detect/Reset, DMA, POR, PWM, WDT
ConnectivityI²C, IrDA, LINbus, SPI, UART/USART
Number of i (O)29
Core processorSTM8A
Case32-LQFP
Data convertersA/D 21x12b; D/A 1x12b
Program memory size32KB (32K x 8)

Product details

That means ST is not actively promoting it for new projects, though it remains available through existing production and aftermarket channels. For a BOM that already qualifies this part, the NRND flag is a signal to evaluate a pin-compatible alternative before a full EOL notice arrives.

Peripheral set and I/O for a LIN-node or sensor hub

Housed in a 32-LQFP (7x7 mm) surface-mount package, the STM8AL3L66TCY is a standard footprint for mid-density automotive MCUs. The 32-pin LQFP keeps the board area small while still offering enough I/O for a LIN node or a local sensor aggregation point.

Frequently asked questions

Is STM8AL3L66TCY obsolete?

For existing production, it remains available through aftermarket channels. Plan a qualification cycle for a replacement before a potential EOL notice.

What is the closest pin-compatible alternative to STM8AL3L66TCY?

ST's STM8A family includes multiple density and package options that are pin-compatible across the 32-LQFP footprint. For an exact replacement, check the STM8AL3Lxx series variants with matching Flash and RAM sizes — the base product number STM8 covers the family. We can help identify a specific alternate when you submit an RFQ.