Microchip Technology 25AA080B-I/P

Overview

25AA080B-I/P from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 32-byte page size, 1.8–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features hardware write protection via WP pin, HOLD suspend functionality, and self-timed 5 ms max write cycles - deployed in microcontroller-based embedded systems for configuration storage and firmware parameter retention.

For engineers reviewing the 25AA080B-I/P datasheet, 25AA080B-I/P pinout, 25AA080B-I/P application, or 25AA080B-I/P equivalent, key selection criteria include SPI clock compatibility up to 10 MHz at 1.8 V, page-write boundary handling, block protection granularity (none/¼/½/all), endurance (1M cycles), and Pb-free PDIP package suitability for through-hole prototyping and legacy industrial PCBs.

Technical Context

The 25AA080B-I/P implements a standard SPI Mode 0,0 or Mode 1,1 interface with separate SI/SO lines, CS-controlled selection, and HOLD-driven transaction suspension. Its internal architecture includes an 8-bit instruction register, status register with WIP/WEL/BP0/BP1 bits, and page latches enabling burst writes within 32-byte physical boundaries.

Write operations require explicit WREN instruction followed by CS high-to-low transition to initiate self-timed internal erase/write; read operations support sequential addressing with automatic address rollover at 03FFh. Hardware write protection engages only when both WP pin is low and WPEN bit is set in the status register.

Key Specifications

Pinout & Package

25AA080B-I/P is packaged in an 8-lead PDIP (Plastic Dual In-Line Package) with 0.300-inch body width, suitable for through-hole mounting and manual soldering in development and industrial control boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080B-I/P, 25LC080B-I/P offers identical functionality at higher minimum voltage, while AT25080B-SSHL-T introduces minor protocol-level differences requiring driver updates - making 25AA080B-I/P optimal for new 1.8 V–5.5 V designs needing drop-in compatibility with Microchip's ecosystem.

Availability

25AA080B-I/P is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, automotive body control modules, and POS terminal firmware storage requiring stable component supply across extended product lifecycles.

Supply support for 25AA080B-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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25AA080B-I/P belongs to Microchip's 25XX080A/B family of SPI Serial EEPROMs, designed specifically for reliable, low-voltage, page-structured nonvolatile storage in resource-constrained embedded systems.

FAQ

What is the maximum SPI clock frequency supported by the 25AA080B-I/P?

The 25AA080B-I/P supports up to 10 MHz SPI clock frequency when VCC is 4.5–5.5 V, 5 MHz at 2.5–4.4 V, and 3 MHz at 1.8–2.4 V. These limits are defined in Table 1-2 AC Characteristics and ensure reliable setup/hold timing across voltage ranges. The 25AA080B-I/P must be clocked within these bounds to guarantee correct instruction decoding and data transfer integrity.

How does page write operation work in the 25AA080B-I/P?

The 25AA080B-I/P supports 32-byte page writes: up to 32 bytes can be loaded into the page buffer before initiating an internal write cycle. All bytes must reside within the same 32-byte physical page boundary (e.g., addresses 0000h–001Fh); crossing boundaries causes wraparound. The 25AA080B-I/P does not auto-increment across pages, so firmware must enforce alignment to avoid unintended overwrites.

What is the function of the HOLD pin on the 25AA080B-I/P?

The HOLD pin on the 25AA080B-I/P suspends ongoing SPI communication without resetting the internal state. When pulled low while SCK is low, it places SI, SCK, and SO in high-impedance and ignores further input transitions except CS. This allows the host MCU to service urgent interrupts and resume exactly where the transfer left off - a critical capability for real-time systems using the 25AA080B-I/P.

Can the 25AA080B-I/P be used with a 1.8 V microcontroller I/O interface?

Yes, the 25AA080B-I/P is fully compatible with 1.8 V logic interfaces: its VIH1 threshold is 2.0 V (min) at VCC ≥ 2.7 V, but VIH2 is 0.7 × VCC - meaning at 1.8 V supply, high-level input is recognized above 1.26 V. With proper pull-ups and noise margins, the 25AA080B-I/P reliably interfaces to 1.8 V MCUs without level shifters, unlike the 25LC080B-I/P which requires ≥2.5 V.

What protection mechanisms prevent accidental writes to the 25AA080B-I/P?

The 25AA080B-I/P employs multiple safeguards: (1) write enable latch reset on power-up, (2) mandatory WREN instruction before any write, (3) automatic WEL reset after each successful write, (4) software-configurable BP0/BP1 block protection, and (5) hardware write protection via WP pin + WPEN bit. Together, these ensure that unintended writes - including during brown-out or reset - are blocked by default in the 25AA080B-I/P.