My Inquiry
My Account
STMicroelectronics STM8AF6246UCX
.jpg)
- Part No.:
- STM8AF6246UCX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
STM8AF6246UCX.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:10,680
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
STM8AF6246UCX from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 16 KB Flash, 1 KB data EEPROM, 2 KB RAM, 10-bit ADC with 10 channels, LINUART, SPI, I2C, and advanced timers-including a 16-bit advanced control timer with dead-time insertion-targeting engine control units and body electronics modules operating up to 150 °C.
For engineers reviewing the STM8AF6246UCX datasheet, STM8AF6246UCX pinout, STM8AF6246UCX application, or STM8AF6246UCX equivalent, this page delivers verified technical context, package-specific pin functions, automotive-grade timing and power specifications, and validated alternative options for ECU redesign and supply continuity planning.
Technical Context
The STM8AF6246UCX implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction efficiency, enabling 10 MIPS at 16 MHz. It integrates dual clock domains: user-trimmable 16 MHz HSI RC oscillator and 128 kHz LSI RC oscillator, plus external crystal support up to 16 MHz with clock security system (CSS) monitoring.
Its analog subsystem includes a 10-bit ADC with 2 LSB total unadjusted error, scan mode, and analog watchdog; its timer suite comprises two 16-bit general-purpose PWM timers (each with up to 3 CAPCOM channels), one advanced control timer (4 CAPCOM, 3 complementary outputs, dead-time insertion), and an 8-bit auto-wakeup timer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic real-time response in safety-critical automotive firmware. |
| Max fCPU | 16 MHz at VDD = 3.3–5.5 V; supports full-speed operation across extended temperature range (−40 to +150 °C). |
| Flash Memory | 16 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle; suitable for field-updatable ECU firmware. |
| Data EEPROM | 1 Kbyte true data EEPROM with 300 kcycle endurance; retains calibration data and fault logs without external NV memory. |
| ADC Resolution & Accuracy | 10-bit SAR ADC with 2 LSB TUE accuracy and linearity; meets ASIL-B sensor interface requirements for throttle/temperature sensing. |
| LIN Interface | LIN 2.2-compliant UART with automatic resynchronization; eliminates need for external LIN transceiver in low-cost body node designs. |
| Operating Temperature | −40 °C to +150 °C ambient; qualified per AEC-Q100 Grade 0, enabling placement near engine compartments or under-hood ECUs. |
| Supply Voltage Range | 3.0 V to 5.5 V; compatible with both 3.3 V and 5 V automotive power domains without level-shifting. |
Pinout & Package
STM8AF6246UCX is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) thermally enhanced package optimized for high-temperature automotive PCB layouts. The 32-pin configuration supports full peripheral mapping including LINUART, SPI, I2C, ADC inputs, and high-sink I/Os rated for current injection immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 3.0–5.5 V supply rail; decoupled via internal VCAP capacitor connection point (VCAP pin required). |
| VSS | Ground reference | Dedicated digital ground; separate analog ground (VSSA) provided for ADC noise isolation. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; supports external watchdog or power-on reset assertion. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with alternate functions including TIM1/2 channels, ADC IN0–IN7, and SPI/I2C signals. |
| PB0–PB7 | General-purpose I/O port B | 8-bit port supporting LINUART TX/RX, SPI SCK/MOSI/MISO, and TIM3/4 channels; includes HS I/O capability. |
| PC0–PC7 | General-purpose I/O port C | 8-bit port with TIM1 advanced output (CH1–CH3), complementary PWM outputs, and dead-time control signals. |
| PD0–PD7 | General-purpose I/O port D | 8-bit port supporting ADC VREF+, SWIM debug interface, and auto-wakeup timer input. |
| VCAP | Internal regulator decoupling | Requires external 1 µF ceramic capacitor to stabilize internal 1.8 V regulator; critical for Flash/EEPROM reliability at 150 °C. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 °C to +150 °C operation with full electrical characterization; reduces validation effort for under-hood applications. |
| Integrated LIN 2.2 UART | Hardware-based LIN master/slave with automatic baud rate resynchronization; eliminates software timing dependency and improves bus robustness. |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, programmable dead-time insertion, and synchronization triggers-enables single-chip 3-phase motor control. |
| True data EEPROM | 1 Kbyte on-die EEPROM with 300 kcycle endurance and 20-year retention; avoids external serial EEPROM and associated BOM cost/failure points. |
| SWIM single-wire debug interface | 2-pin (SWIM/NRST) in-circuit programming and debugging; enables field firmware updates without JTAG header footprint. |
| Low-power modes with clock gating | Wait, Auto-wakeup, and Halt modes with per-peripheral clock enable/disable control; achieves sub-µA standby current in battery-connected modules. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Real-time spark timing, fuel injection pulse width calculation, and OBD-II diagnostics in gasoline engine management systems. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop control algorithms with deterministic 16 MHz instruction throughput and hardware ADC sampling synchronized to crankshaft position. Use Value: Integrated 10-bit ADC with analog watchdog and 16-bit advanced timer with dead-time insertion eliminate external signal conditioning and gate-driver ICs. |
Use Scenario: Centralized control of door locks, window lifts, interior lighting, and LIN-connected sensors (e.g., rain/light sensors) in passenger vehicles. IC Role / Device Role / Timing Role: LIN master node managing up to 16 slave nodes while running CAN/LIN gateway logic and PWM dimming for LED lighting. Use Value: On-chip LINUART and 38 robust I/Os with current-injection immunity reduce external transceivers and ESD protection components. |
| Transmission Control Unit (TCU) | Heating/Ventilation Control |
|
Use Scenario: Gear selection logic, solenoid driver timing, and hydraulic pressure feedback processing in automatic transmission systems. IC Role / Device Role / Timing Role: Safety-aware controller with independent watchdog, window watchdog, and Flash write protection enforcing ASIL-B functional safety requirements. Use Value: Dual watchdog architecture (independent + window) and read-out protection (ROP) meet ISO 26262 diagnostic coverage targets without external safety monitors. |
Use Scenario: HVAC blower motor speed regulation, cabin temperature sensing, and actuator control in automotive climate systems. IC Role / Device Role / Timing Role: Sensor fusion hub aggregating NTC thermistor readings, PWM fan control, and LIN communication with dashboard display. Use Value: 10-channel ADC with individual data buffers and scan mode enables simultaneous multi-sensor acquisition without CPU overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AF6266UCX | 32 KB Flash, 2 KB RAM, same peripherals and pinout; higher memory density with identical VFQFPN32 footprint. | Preferred for ECU firmware with larger bootloader or OTA update partitions; no change to PCB layout or thermal design. | Select when future firmware growth or dual-bank Flash update capability is required without requalification. |
| RL78/F13-GB | Renesas RL78 core, 24 MHz max, 16 KB Flash, 1.25 KB RAM; supports LIN, I2C, SPI, but lacks advanced PWM dead-time insertion. | Suitable for non-motor-control BCMs where complex PWM timing is not needed; requires different toolchain and debug interface. | Consider only if existing Renesas ecosystem alignment outweighs loss of integrated dead-time control and AEC-Q100 Grade 0 validation depth. |
Compared with STM8AF6266UCX, the STM8AF6246UCX trades Flash capacity for lower cost and smaller code footprint in resource-constrained ECUs; versus RL78/F13-GB, it delivers superior motor-control timing precision and deeper automotive qualification evidence for safety-critical deployment.
Availability
STM8AF6246UCX is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and HVAC systems requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF6246UCX 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 devices, sensors, and automotive ICs for industrial, automotive, and consumer markets.
The STM8A automotive microcontroller product line targets cost-sensitive, high-reliability embedded control applications-including powertrain, chassis, and body electronics-with AEC-Q100 qualification, extended temperature support, and integrated LIN/CAN-ready peripherals.
FAQ
What is the maximum operating junction temperature for STM8AF6246UCX?
The STM8AF6246UCX is rated for operation up to +150 °C ambient temperature and has a maximum junction temperature of +160 °C under specified thermal conditions. Its VFQFPN32 package features low thermal resistance (θJA = 45 °C/W typical), enabling reliable operation in under-hood environments without forced airflow when properly heatsinked on 2 oz copper PCBs.
Does STM8AF6246UCX support in-system programming via SWIM?
Yes, STM8AF6246UCX supports full in-system programming and debugging using the Single Wire Interface Module (SWIM) protocol over the NRST and SWIM pins. This allows firmware updates and real-time debugging without removing the device from the PCB, and is compatible with ST-LINK/V2 and ST-LINK/V2-1 debug probes.
How is Flash memory protected against unauthorized access or corruption?
Flash protection is implemented via three hardware mechanisms: Read-Out Protection (ROP) levels (Level 1 disables debug read, Level 2 permanently locks debug interface), Write Protection (WP) sectors configurable per 128-byte block, and User Boot Code (UBC) protection that prevents accidental overwrite of bootloader sections during application updates.
Can the internal 16 MHz RC oscillator be calibrated for improved accuracy?
Yes, the 16 MHz high-speed internal RC oscillator (HSI) supports user trimming via the CLK_HSITRIMR register, allowing ±1% frequency adjustment in 0.5% steps. Calibration is performed at room temperature and retained across power cycles using the data EEPROM, enabling stable clocking without external crystal in cost-sensitive LIN node designs.
STM8AF6246UCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-VFQFN Exposed Pad
- Series:
- STM8A
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8A
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 25
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 512 x 8
- RAM Size:
- 2K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 7x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF6246UCX FAQ
1.How can I place an order for STM8AF6246UCX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6246UCX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM8AF6246UCX reliable?
The price and inventory of STM8AF6246UCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6246UCX is usually 5 days.
3.What payment methods are accepted for STM8AF6246UCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6246UCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6246UCX?
STM8AF6246UCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6246UCX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM8AF6246UCX?
For technical support, including STM8AF6246UCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6246UCX requirements.
6.How does Aetrix verify that STM8AF6246UCX is sourced from the original manufacturer or authorized distributors?
All STM8AF6246UCX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM8AF6246UCX meets industry standards.
7.What is the process for return or replacement of STM8AF6246UCX?
All STM8AF6246UCX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6246UCX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM8AF6246UCX part is unused and in its original packaging.
Return procedure for STM8AF6246UCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM8AF6246UCX Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
