Microchip Technology 25AA080D-I/MS

Overview

25AA080D-I/MS from Microchip Technology is an 8 Kbit SPI Serial EEPROM with 1.8–5.5 V supply range, 32-byte page write capability, and industrial temperature rating (–40°C to +85°C). It features hardware write protection via WP pin, HOLD suspend functionality, and operates up to 10 MHz at 4.5–5.5 V for embedded system configuration storage, sensor calibration data retention, and firmware parameter logging.

For engineers reviewing the 25AA080D-I/MS datasheet, 25AA080D-I/MS pinout, 25AA080D-I/MS application, or 25AA080D-I/MS equivalent, key selection criteria include VCC operating range compatibility, page size alignment for efficient writes, SPI timing compliance at target clock frequency, and hardware write-protection behavior under power cycling.

Technical Context

The 25AA080D-I/MS implements a standard SPI Mode 0,0 interface with separate SI and SO lines, requiring CS assertion, SCK synchronization, and optional HOLD/HPEN control. Its internal architecture includes a 1024 × 8-bit EEPROM array, page latches, and a STATUS register with WIP, WEL, BP0/BP1, and WPEN bits.

Write operations require explicit WREN instruction followed by WRITE command and address/data; page writes are limited to 32 bytes within a single physical page boundary (000h–01Fh, 020h–03Fh, etc.). The device supports block protection of 0%, 25%, 50%, or 100% of memory via nonvolatile BP bits and integrates power-on write-disable logic.

Key Specifications

Pinout & Package

25AA080D-I/MS is housed in an 8-lead MSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts while maintaining hand-solderability and thermal performance in industrial environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080D-I/MS, the 25AA080D-I/MS extends low-voltage operation to 1.8 V while retaining identical timing and protection features; versus AT25080B-MAHL-T, it offers larger page size for reduced write overhead but lower maximum clock rate.

Availability

25AA080D-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system boot configuration, and smart energy meter firmware patch logging requiring stable component supply across multi-year production cycles.

Supply support for 25AA080D-I/MS 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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory products, with a focus on embedded control and connectivity solutions.

The 25AA080D-I/MS belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-power nonvolatile data storage in industrial, automotive, and consumer applications where SPI interface simplicity and long-term data integrity are critical.

FAQ

What is the minimum VCC voltage supported by the 25AA080D-I/MS?

The 25AA080D-I/MS supports a minimum supply voltage of 1.8 V, enabling direct integration with ultra-low-power microcontrollers and battery-operated systems. This specification is validated across the full industrial temperature range (–40°C to +85°C) and applies to all functional modes including read, write, and standby. Operation below 1.8 V may result in undefined behavior or failure to meet AC timing parameters.

How does the HOLD pin function during an active SPI transaction on the 25AA080D-I/MS?

The HOLD pin on the 25AA080D-I/MS suspends ongoing SPI communication when pulled low while CS is active and SCK is low, preserving internal state without resetting the sequence. During HOLD, SI, SCK, and SO enter high-impedance states and ignore input transitions except CS. Resuming requires bringing HOLD high while SCK remains low; violating this timing causes undefined behavior. This feature allows host MCUs to service urgent interrupts without retransmitting commands.

Can the 25AA080D-I/MS perform page writes across memory boundaries?

No, the 25AA080D-I/MS cannot perform page writes across physical page boundaries. With a 32-byte page size, boundaries occur every 32-byte increment (e.g., 000h–01Fh, 020h–03Fh). Attempting a page write that crosses a boundary wraps data to the start of the current page instead of advancing to the next. Application firmware must validate address alignment and split writes at boundaries-failure causes silent data corruption, not an error flag.

What protection mechanisms prevent unintended writes to the 25AA080D-I/MS memory array?

The 25AA080D-I/MS employs multiple protection layers: a volatile write-enable latch reset on power-up and after each write, nonvolatile block protection bits (BP0/BP1) configurable via WRSR, and hardware write protection enabled only when WP pin is low AND WPEN bit is set. Additionally, CS must be raised after final data bit to initiate internal write, and the WIP bit indicates active programming-reading memory during write returns undefined data.

Is the 25AA080D-I/MS pin-compatible with other Microchip 8 Kbit SPI EEPROMs in MSOP packages?

Yes, the 25AA080D-I/MS shares identical 8-lead MSOP pinout and electrical characteristics with 25LC080D-I/MS, 25AA080C-I/MS, and 25LC080C-I/MS. All use the same CS/SO/WP/VSS/SI/SCK/HOLD/VCC arrangement and support SPI Mode 0,0. However, VCC range (1.8–5.5 V vs. 2.5–5.5 V) and page size (32 vs. 16 bytes) differ between 'D' and 'C' variants, requiring firmware validation for full functional compatibility.