Microchip Technology 25AA080B-I/SN

Overview

25AA080B-I/SN from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1.8–5.5 V supply range, 32-byte page size, and industrial temperature rating (–40°C to +85°C). It features self-timed write cycles (≤5 ms), 1,000,000 erase/write endurance, and hardware write protection via WP pin and Status Register BP bits. It is used in embedded systems for firmware parameter storage, calibration data retention, and configuration backup.

For engineers reviewing the 25AA080B-I/SN datasheet, 25AA080B-I/SN pinout, 25AA080B-I/SN application, or 25AA080B-I/SN equivalent, key selection considerations include VCC operating range compatibility, page-write boundary handling, HOLD/CS timing margins at 1.8 V, and block protection granularity (1/4, 1/2, or full array).

Technical Context

The 25AA080B-I/SN implements a standard SPI Mode 0,0 or 1,1 interface with separate SI and SO lines, requiring CS assertion, SCK synchronization, and optional HOLD suspension. Its internal architecture includes a 1024 × 8-bit EEPROM array, page latches, HV generator for programming, and 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 (000h–01Fh, 020h–03Fh, etc.). The device supports sequential read with automatic address increment and rollover from 03FFh to 0000h, and maintains high-impedance SO during CS deassertion or HOLD activation.

Key Specifications

Pinout & Package

25AA080B-I/SN is packaged in an 8-lead SOIC (SN) with 1.27 mm pitch, 4.90 mm × 6.00 mm body, and Pb-free RoHS-compliant finish. Pin 1 is marked with a notch or dot; package meets JEDEC MS-012 standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080B-I/SN, 25LC080B-I/SN lacks 1.8 V support but offers identical functionality above 2.5 V, while AT25080B-MAHL-T adds AEC-Q100 qualification at the cost of non-identical status register mapping-requiring firmware adaptation for BP/WPEN control.

Availability

25AA080B-I/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration archives, and automotive body control modules requiring stable component supply across multi-year production cycles.

Supply support for 25AA080B-I/SN 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/SN 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 clock frequency supported by the 25AA080B-I/SN across its full voltage range?

The 25AA080B-I/SN supports up to 10 MHz at VCC ≥ 4.5 V, 5 MHz at 2.5 V ≤ VCC < 4.5 V, and 3 MHz at 1.8 V ≤ VCC < 2.5 V. These limits are defined in Table 1-2 AC Characteristics and ensure reliable setup/hold timing for SI/SO signals under varying supply conditions. The 25AA080B-I/SN must be operated within these frequency–voltage constraints to guarantee correct SPI communication and avoid data corruption.

How does the 32-byte page size of the 25AA080B-I/SN affect write operations?

The 32-byte page size in the 25AA080B-I/SN defines the maximum number of consecutive bytes that can be written in a single page-write command without crossing a physical boundary. Attempting to write across a page boundary causes data to wrap to the start of the same page. Software must align addresses and count bytes to stay within pages (e.g., 000h–01Fh, 020h–03Fh); the 25AA080B-I/SN does not auto-segment writes across pages.

Can the 25AA080B-I/SN be used in a 1.8 V system with full functionality?

Yes, the 25AA080B-I/SN is fully specified for 1.8–5.5 V operation, including all DC and AC parameters at 1.8 V. It supports 3 MHz clocking, retains 32-byte page write capability, and maintains full Status Register access and HOLD functionality at 1.8 V. This makes the 25AA080B-I/SN suitable for ultra-low-power applications where other 25LC variants would fail to operate.

What protection mechanisms prevent unintended writes to the 25AA080B-I/SN memory array?

The 25AA080B-I/SN employs multiple layers: (1) a volatile write-enable latch (WEL) that resets on power-up and after every write; (2) nonvolatile block protection (BP0/BP1) configurable via WRSR; (3) hardware write-protection enabled by WP pin + WPEN bit; and (4) power-on/off data protection circuitry. All four mechanisms must be considered together-the 25AA080B-I/SN will not accept writes unless WEL=1 and no active protection blocks the target address.

Is the 25AA080B-I/SN pin-compatible with the 25AA080A-I/SN?

Yes, the 25AA080B-I/SN is pin-compatible with the 25AA080A-I/SN in the same package (e.g., SN), sharing identical pinout, electrical characteristics, and SPI protocol. The only functional difference is page size: 32 bytes for 25AA080B-I/SN versus 16 bytes for 25AA080A-I/SN. Firmware must be updated to handle larger page boundaries when migrating to the 25AA080B-I/SN.