Manufacturer Part Number

ST72F321AR7T6TR

Description

8-bit microcontroller from STMicroelectronics ST7 series with 48KB flash memory, 1.5KB RAM, and 48 I/O pins. Features integrated peripherals and fast connectivity options. Obsolete product but still available in limited stock.

Specifications

Core: ST7, 8-bit

Clock Speed: 8MHz

Program Memory: 48KB Flash

RAM: 1.5KB (1.5K x 8)

EEPROM: Not present

Number of I/O Pins: 48

Power Supply Voltage: 3.8V to 5.5V

Data Converter: 16-channel, 10-bit ADC

Connectivity: I2C, SCI, SPI

Peripherals: LVD, POR, PWM, WDT

Oscillator: Internal

Operating Temperature: -40°C to +85°C

Mounting Type: Surface Mount

Package: 64-TQFP

RoHS Status: ROHS3 Compliant

MSL: 3 (168 hours)

REACH Status: Unaffected

Device Structure

Highly integrated microcontroller

64-pin TQFP surface mount package

Core: ST7 architecture

Supports multiple communication interfaces

Integrated analog-to-digital converter

Designed for embedded control scenarios

Performance Characteristics

Reliable 8-bit performance at 8MHz

Fast flash memory access

Integrated PWM for motor or signal control

Watchdog timer enhances safety

Low voltage detect and power-on reset function

Wide operating voltage and temperature range for field applications

Application Environments

Home appliances

Industrial control systems

Consumer electronics

Data acquisition and sensor interfaces

Embedded controllers

Suitable for designs requiring multiple I/O and mixed signal capabilities

Selection Guidelines

Choose if 8-bit computing and 48KB flash meet your memory needs

Select when multiple connectivity interfaces are required

Ensure the 64-TQFP mounting matches your PCB design

Check voltage and operating temperature compatibility

Consider stock availability due to obsolete status

Usage Considerations

Product is officially obsolete; plan for long-term availability

Check for component lifecycle risk in new designs

Follow correct handling to comply with MSL 3 and avoid moisture damage

Internal oscillator may require calibration for precise timing

ROHS3 compliance suits most global environmental regulations

Potential Equivalent/Replacement Models

There are other 8-bit microcontrollers from STMicroelectronics ST7 series and the newer STM8 series that may offer similar or enhanced functionality. Examples include:

ST72F324BK6

ST72F321J4

AVR ATmega48/88/168 (Microchip)

STM8S105C6T6 (STMicroelectronics)

NXP LPC8xx series

Renesas RL78 family

Before substituting, check pinout, package, and peripheral compatibility thoroughly. If no direct equivalents match your requirements, contact the Ariat-Tech sales team for assistance with alternatives and replacement planning.

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