AT89C2051-24PU Microchip Technology IC MCU 8BIT 2KB FLASH 20DIP


The AT89C2051-24PU is an 8-bit microcontroller unit (MCU) produced by Microchip Technology (formerly Atmel). This MCU is part of the popular 8051 family and features 2KB of Flash memory for program storage. Here is an overview of the AT89C2051-24PU microcontroller, including its key features, specifications, package type, and common applications:


AT89C2051-24PU Overview:

  • Manufacturer: Microchip Technology (formerly Atmel)
  • IC Type: Microcontroller Unit (MCU)
  • Architecture: 8-bit 8051
  • Flash Memory: 2KB for program storage
  • Package: 20-pin Dual Inline Package (DIP)
  • Operating Voltage: Typically operates at 5V
  • Clock Speed: Standard clock frequency support

Key Features:

  • Flash Memory: Provides 2KB of in-system programmable Flash memory for program storage.
  • RAM: Typically includes around 128 bytes (128B) of RAM for data storage and manipulation.
  • EEPROM: May feature additional electrically erasable programmable read-only memory (EEPROM) for non-volatile data storage.
  • I/O Pins: Offers a number of input/output pins for interfacing with external components and peripherals.
  • Timers/Counters: Equipped with hardware timers/counters for various timing and counting applications.
  • Communication Interfaces: Supports serial communication protocols such as UART for data exchange.
  • Analog Comparators: Possible inclusion of analog comparators for analog signal processing.
  • DataSheet

    AT89C2051-24PU PDF


  • Operating Voltage Range: Typically operates within a 4.5V to 5.5V range.
  • Clock Speed: Supports a range of clock frequencies suitable for various applications.
  • Package Type: 20-pin DIP for through-hole mounting on a PCB.
  • GPIO: Multiple General Purpose Input/Output pins for versatile connectivity.
  • Low Power Consumption: Capable of operating in low-power modes for energy-efficient applications.
  • Integrated Peripherals: May include UART for serial communication and timers for event timing.

Typical Applications:

  • Embedded Systems: Used in a variety of embedded applications for control and monitoring functions.
  • Sensor Interfacing: Suitable for interfacing with sensors and processing sensor data.
  • IoT Devices: Applicable for Internet of Things (IoT) projects requiring microcontroller functionality.
  • Consumer Electronics: Found in various consumer electronic devices and DIY projects.


  • The AT89C2051-24PU microcontroller is known for its simplicity, ease of use, and cost-effectiveness, making it popular for educational purposes and small-scale embedded projects.
  • Consider referring to the official datasheet, development tools like assemblers or compilers, and programming resources provided by Microchip Technology for seamless integration and programming of the AT89C2051-24PU microcontroller.

The AT89C2051-24PU microcontroller with its 8-bit 8051 architecture, 2KB Flash memory, and 20-pin DIP package offers a reliable platform for various embedded projects that require moderate computational power and interfacing capabilities.