Microchip Technology 25AA080-I/P

Overview

25AA080-I/P from Microchip Technology is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 1.8–5.5 V supply range, and industrial temperature support (−40°C to +85°C). It features 16-byte page write, 5 ms max internal write cycle time, hardware write protection via WP pin, and HOLD functionality for interrupt-safe serial communication - used in microcontroller-based systems for nonvolatile configuration storage.

For engineers reviewing the 25AA080-I/P datasheet, 25AA080-I/P pinout, 25AA080-I/P application, or 25AA080-I/P equivalent, key selection criteria include voltage compatibility (1.8 V min), SPI timing at 1 MHz, page-write efficiency, block protection granularity, and PDIP-8 package suitability for prototyping and legacy industrial PCBs.

Technical Context

The 25AA080-I/P implements a standard SPI Mode 0,0 interface with separate SI (data-in) and SO (data-out) lines, requiring CS, SCK, and optional HOLD/WP control. Its internal architecture includes a status register with WIP, WEL, BP0/BP1, and WPEN bits enabling flexible array protection (none/1/2/all quarters) and hardware write lockout.

Write operations require explicit WREN instruction followed by CS high-to-low transition to initiate self-timed erase-and-write cycles; read supports sequential addressing with automatic rollover. The device powers up in standby mode with write latch reset and SO in high-impedance state - ensuring safe default behavior during system boot.

Key Specifications

Pinout & Package

8-pin PDIP (300 mil) package with through-hole mounting, suitable for breadboarding, manual assembly, and legacy board designs requiring mechanical robustness and thermal mass.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SPI Serial EEPROM applications.

Compared with 25AA080T-I/P and 25LC080-I/P, the 25AA080-I/P offers unique 1.8 V operation and PDIP-8 form factor - making it optimal for low-voltage evaluation, educational use, and legacy through-hole industrial boards where tape-and-reel or 2.5 V minimum constraints are prohibitive.

Availability

25AA080-I/P is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics, automotive body control modules, and smart metering applications requiring stable component supply and long-term obsolescence management.

Supply support for 25AA080-I/P 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

Microchip Technology Inc. is a leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25AA080-I/P belongs to Microchip's legacy SPI Serial EEPROM product line, designed specifically for reliable, low-power nonvolatile storage in cost-sensitive industrial and consumer systems requiring simple 3-wire+CS interface and robust data retention.

FAQ

What is the operating voltage range of the 25AA080-I/P?

The 25AA080-I/P operates from 1.8 V to 5.5 V, enabling direct integration into both low-power battery-operated devices and standard 3.3 V or 5 V industrial systems. This wide range eliminates level-shifting requirements and supports mixed-voltage board designs where the 25AA080-I/P shares VCC with other components.

Does the 25AA080-I/P support page write operations?

Yes, the 25AA080-I/P supports 16-byte page write operations, allowing up to 16 bytes to be loaded into the page buffer before initiating an internal write cycle. This reduces total programming time compared to byte-by-byte writes and minimizes MCU intervention during EEPROM updates.

How does the HOLD pin function on the 25AA080-I/P?

The HOLD pin on the 25AA080-I/P suspends ongoing SPI communication without resetting the internal state - allowing the host MCU to service urgent interrupts and resume transmission from the exact point of suspension. It requires SCK to be low when asserted or deasserted to ensure correct timing alignment.

What protection mechanisms prevent accidental writes to the 25AA080-I/P?

The 25AA080-I/P uses multiple safeguards: a volatile write-enable latch (WEL) that resets on power-up or after each write, hardware write protection via the WP pin (when WPEN=1), and software-configurable block protection (BP0/BP1) to lock specific memory quarters - collectively preventing unintended data corruption.

Is the 25AA080-I/P pin-compatible with other members of the 25XX080 family?

Yes, the 25AA080-I/P is pin-compatible with 25LC080-I/P and 25C080-I/P in the same PDIP-8 package, sharing identical pinout, memory map, instruction set, and SPI timing structure - enabling voltage-range-based drop-in substitution where system voltage and speed requirements align.