STMicroelectronics ST72F324J4T6

Overview

ST72F324J4T6 from STMicroelectronics is an 8-bit Flash microcontroller with 8 KB program memory, 384 bytes RAM, 10-bit ADC (12-channel), dual 16-bit timers (Timer A/B), SPI and SCI serial interfaces, and PLL-based clock multiplication - deployed in industrial motor control and sensor interface modules requiring deterministic real-time response under 5.5 V supply.

For engineers reviewing the ST72F324J4T6 datasheet, ST72F324J4T6 pinout, ST72F324J4T6 application, or ST72F324J4T6 equivalent, this device supports in-application programming (IAP), low-voltage detection with interrupt capability, four power-saving modes (Halt/Active-Halt/Wait/Slow), and high-sink I/O (12 lines) for direct LED or relay drive without external buffers.

Technical Context

The ST72F324J4T6 implements a Harvard-architecture CPU core with 63 instructions and 17 addressing modes, including 8×8 unsigned multiply. Its clock system integrates crystal/resonator, internal RC, and PLL (2× multiplication) sources with clock security and bypass options.

Interrupt handling uses a nested controller with 10 vectors plus TRAP/RESET, supporting up to 9 external interrupt lines across 4 vectors. Peripheral timing is managed via two independent 16-bit timers - Timer A (1 capture/1 compare/PWM) and Timer B (2 captures/2 compares/PWM) - both supporting pulse generation and external clock input.

Key Specifications

Pinout & Package

TQFP44 (10 × 10 mm, 0.8 mm pitch) package with exposed thermal pad - optimized for compact industrial PCB layouts and moderate thermal dissipation in sealed enclosures.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with ST72F324J4T6, ST72F324B4T6 offers longer flash lifetime and wider temperature tolerance for mission-critical deployments, while STM8S003F3P6 trades beeper/RTC for faster execution and nonvolatile parameter storage - making it preferable for next-generation designs prioritizing longevity and configurability.

Availability

ST72F324J4T6 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, home appliance UI panels, and DIN-rail PLC I/O modules requiring stable component supply amid legacy design maintenance.

Supply support for ST72F324J4T6 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 management ICs, and MEMS sensors for industrial, automotive, and consumer markets.

The ST7 family was engineered for cost-sensitive, real-time embedded control applications demanding high I/O density, analog integration, and ultra-low-power operation - particularly in white goods, building automation, and industrial actuators.

FAQ

Is ST72F324J4T6 still recommended for new designs?

No - STMicroelectronics explicitly marks ST72F324J4T6 as "NOT FOR NEW DESIGN" in its official documentation. The ST72F324Bx series (e.g., ST72F324B4T6) is the designated replacement, offering improved flash endurance, ESD rating, and extended temperature range. Legacy design support remains active, but new projects should evaluate the ST72F324Bx or STM8S families.

What debug interfaces does ST72F324J4T6 support?

ST72F324J4T6 supports In-Circuit Programming (ICP) via the ICC interface using a standard ST-LINK-compatible debugger and the dedicated ICCSEL/VPP pin. It does not support SWD or JTAG. Debugging requires the STVP (ST Visual Programmer) or compatible third-party tools that implement the ST7 ICC protocol at 3.3 V or 5 V logic levels.

Can the 10-bit ADC operate during low-power modes?

Yes - the ADC can perform conversions in Wait and Active-Halt modes, but not in Halt or Slow modes. In Wait mode, the CPU stops while peripherals (including ADC) remain clocked; in Active-Halt, selected peripheral clocks persist. Conversion results trigger interrupts usable for wake-up, enabling event-driven sampling without full CPU activation.

Does ST72F324J4T6 include hardware CRC or encryption engines?

No - ST72F324J4T6 lacks dedicated hardware CRC computation or cryptographic acceleration blocks. Firmware-based CRC-16/32 routines are commonly implemented in application code for communication frame integrity checks. Security relies on Flash read-out protection and LVD-triggered secure reset, not cryptographic primitives.