Microchip Technology 25AA080-I/SN

Overview

25AA080-I/SN 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 capability, 5 ms max internal write cycle time, and hardware write protection via WP pin and Status register. It is used in embedded systems for nonvolatile storage of calibration data, configuration settings, and firmware parameters.

For engineers reviewing the 25AA080-I/SN datasheet, 25AA080-I/SN pinout, 25AA080-I/SN application, or 25AA080-I/SN equivalent, key selection considerations include SPI interface compatibility, low-voltage operation down to 1.8 V, industrial-grade reliability, and block-level write protection granularity (none/¼/½/all array).

Technical Context

The 25AA080-I/SN implements a standard SPI Mode 0,0/Motorola-compatible serial interface with separate SI (data in), SO (data out), SCK (clock), CS (chip select), HOLD (pause), and WP (write-protect) signals. It uses an internal high-voltage generator for EEPROM programming and includes a status register with WIP, WEL, BP0/BP1, and WPEN bits.

Its architecture supports sequential read, byte/page write, and suspend/resume via HOLD while maintaining internal address pointer state. Write operations require explicit WREN instruction and CS high-to-low transition to initiate self-timed erase-and-write cycles - no external timing control needed.

Key Specifications

Pinout & Package

25AA080-I/SN is housed in an 8-pin narrow SOIC (150 mil) package per JEDEC MS-012, with gull-wing leads and 1.27 mm pitch. The package is RoHS-compliant and rated for industrial temperature operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080-I/SN, the 25AA080A-I/SN offers superior ESD immunity and updated process qualification, while 25AA080T-I/SN provides identical functionality in tape-and-reel format - both retain full pin and software compatibility but differ in packaging and revision maturity.

Availability

25AA080-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, smart energy meter firmware, and automotive body control module applications requiring stable component supply and long-term obsolescence management.

Supply support for 25AA080-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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25AA080-I/SN belongs to Microchip's legacy SPI Serial EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with simple serial interface integration.

FAQ

What is the maximum clock frequency supported by the 25AA080-I/SN?

The 25AA080-I/SN supports up to 1 MHz maximum SPI clock frequency when VCC is 4.5 V to 5.5 V. At lower supply voltages (2.5–4.5 V), max clock drops to 2 MHz for 25LC080 variants, but 25AA080-I/SN is limited to 1 MHz across its full 1.8–5.5 V range per DS21230E AC Characteristics table. This ensures timing margin for reliable operation in noisy industrial environments.

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

Yes, the 25AA080-I/SN supports 16-byte page write operations - the entire page must be written in one SPI transaction, and the address must align to a 16-byte boundary (e.g., 0x0000, 0x0010). Attempting to cross a page boundary during write will cause wraparound and overwrite earlier bytes in the same page. Page write reduces total write cycles compared to byte-by-byte writes.

How does hardware write protection work on the 25AA080-I/SN?

Hardware write protection on the 25AA080-I/SN requires both the WP pin low and the WPEN bit set high in the Status register. When enabled, this blocks writes to nonvolatile Status register bits only - memory array writes remain unaffected unless also blocked by BP0/BP1 settings. If WPEN = 0, the WP pin has no effect, allowing full Status register programmability regardless of WP pin state.

What is the purpose of the HOLD pin on the 25AA080-I/SN?

The HOLD pin on the 25AA080-I/SN suspends an ongoing SPI transaction without resetting the internal address pointer or requiring retransmission. It must be asserted while SCK is low; during HOLD, SI/SO/SCK enter high-impedance and are ignored. This allows microcontrollers to service higher-priority interrupts and resume communication seamlessly - critical for real-time embedded systems.

Is the 25AA080-I/SN suitable for new designs?

No - Microchip explicitly states "Not recommended for new designs" in DS21230E, advising migration to the enhanced 25AA080A-I/SN or 25LC080A-I/SN. While 25AA080-I/SN remains available and functional, the A-series revisions offer improved ESD performance (>6 kV vs. >4 kV), tighter AC timing, and extended lifecycle support. For new projects, 25AA080A-I/SN is the preferred drop-in replacement.