ATMEGA88A-PU
ATMEGA88A-PU - 8-bit 20MHz AVR MCU | Microchip Technology
The Microchip Technology ATMEGA88A-PU is an 8-bit AVR RISC-based microcontroller with 20 MHz maximum clock speed, 8 KB of ISP Flash memory, 512 B of EEPROM, 1 KB of SRAM, and 23 general-purpose I/O lines. It is supplied in a 28-pin plastic dual in-line package (PDIP), designated by the “-PU” package suffix. The device combines picoPower technology with read-while-write Flash, a byte-oriented Two-Wire Interface, USART, and flexible timer/counter resources.
A microcontroller is a complete programmable control component integrating a CPU core, nonvolatile program memory, data memory, peripherals, and I/O in one package. Within the product hierarchy, the ATMEGA88A-PU is an 8-bit AVR microcontroller, part of the broader embedded-controller and semiconductor categories. It is suited to compact embedded systems in which deterministic control, serial communication, and low-cost PCB assembly are more important than high processor throughput or large data storage.
The verified device data identifies three timer/counters with compare modes, internal and external interrupts, 32 general-purpose working registers, and serial interfaces including USART and Two-Wire Interface. Its 23 I/O lines provide flexible connections for sensors, actuators, indicators, and control logic. Read-while-write Flash allows the program memory to remain readable during programming operations, while the 512 B EEPROM supports persistent parameter storage outside the 1 KB SRAM workspace.
The 28-PDIP package supports through-hole assembly and is useful for prototypes, educational platforms, and production boards where insertion and inspection are preferred over compact SMT packaging. The manufacturer product page describes the ATmega88A family as an active, picoPower 8-bit AVR RISC-based device. The DigiKey listing identifies ATMEGA88A-PU as a 28-PDIP part operating up to 20 MHz, while Mouser lists 8 KB Flash, 512 B EEPROM, and 1 KB SRAM.
Typical applications include compact sensor controllers, building-automation endpoints, industrial control modules, hobbyist robotics, and legacy AVR firmware updates. The USART supports host-oriented serial links, while the Two-Wire Interface can connect compatible sensors or peripherals. For new designs, engineers should confirm the exact oscillator, fuse, and operating-voltage configuration against the manufacturer documentation for the selected ordering variant.
A key design consideration is package choice: the DIP format occupies more board area than an equivalent surface-mount package, but it simplifies breadboard prototyping, socket assembly, and field replacement. Firmware must also be sized for the 8 KB Flash limit and should account for bootloader space if serial programming is retained. Decoupling and signal-layout guidance should follow the AVR family hardware recommendations.
This page consolidates verified manufacturer and distributor information, verified pricing, package data, and practical selection guidance. It also distinguishes a genuine drop-in alternative from parts that merely use a similar controller or require a footprint, memory, voltage, or peripheral-function change.
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