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STMicroelectronics STM8AL3166UCX — Microcontrollers & Processors (MCU / MPU / DSP)

STM8AL3166UCX STM8 8-bit MCU, 16MHz, 32KB Flash, AEC-Q100

MPNSTM8AL3166UCX
NRND

STMicroelectronics STM8A series STM8AL3166UCX, 8-bit STM8 core MCU, 16MHz, 32KB (32K x 8) FLASH, 2K x 8 RAM, 1K x 8 EEPROM, 30 I/O, 22x12b ADC, 1x12b DAC, 1.65V-3.6V, -40°C to 125°C, 32-VFQFN Exposed Pad.

$1.9548Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STM8AL3166UCX 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)30
Core processorSTM8
Case32-VFQFN Exposed Pad
Data convertersA/D 22x12b; D/A 1x12b
Program memory size32KB (32K x 8)

Product details

NRND — last-time-buy window is the procurement reality

This is the official lifecycle flag that tells procurement and engineering the part is in its phase-out trajectory — it remains available for existing production through the last-time-buy window, but no new design should commit to this order code. For a BOM line already using it, the immediate action is to secure final buys or qualify a replacement before the LTB closes.

AEC-Q100 and 125°C — built for under-hood automotive

That temperature grade puts it squarely in under-hood and engine-bay environments — powertrain control modules, transmission controllers, brake systems, and any ECU that lives near the engine block. The 1.65V to 3.6V supply range lets it run from a single lithium cell or a regulated 3.3V rail, which simplifies the power tree in space-constrained automotive modules.

The EEPROM is useful for storing calibration constants and fault codes without wearing the Flash. The 30 I/O pins in a 32-VFQFN (5x5 mm) package give a good pin-to-footprint ratio for compact ECU designs.

Brown-out detect and DMA for reliable operation

On-chip brown-out detect/reset and a POR (power-on reset) keep the MCU from running in undefined low-voltage states — critical for automotive safety. The internal oscillator means no external crystal is needed for many applications, saving two pins and board space.

Frequently asked questions

Can STM8AL3166UCX be used in new automotive designs?

No. The NRND status means STMicroelectronics does not recommend it for new designs. For a new automotive ECU, look at the current-production STM8A variants that share the same AEC-Q100 qualification and peripheral set.

What is the replacement for STM8AL3166UCX?

The evidence does not list an official STMicroelectronics successor order code for STM8AL3166UCX. For a pin-compatible alternative within the STM8A family, review the current-production STM8AL3Lx or STM8AF52xx series — they share the same 32-VFQFN footprint and automotive qualification, though peripheral mix and memory sizes vary. Confirm exact compatibility against the target application's requirements.

What are the complete specifications and pinout of STM8AL3166UCX?

Key specifications: 8-bit STM8 core at 16 MHz, 32 KB Flash, 2K x 8 RAM, 1K x 8 EEPROM, 30 I/O, 22-channel 12-bit ADC, 12-bit DAC, I²C/SPI/UART/LIN/IrDA connectivity, internal oscillator, brown-out detect, DMA, -40°C to 125°C, 1.65V to 3.6V supply, in a 32-VFQFN (5x5 mm) package. Pinout details are in the STM8AL3166 datasheet — the 32-VFQFN pin mapping is standard across the STM8AL3Lx density options.