Microchip Technology 25AA080AT-I/SN

Overview

25AA080AT-I/SN from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 1.8–5.5 V supply range, and 16-byte page write capability. It operates across industrial temperature (−40°C to +85°C) and uses standard 8-lead SOIC (SN) packaging. This device serves as nonvolatile configuration storage in microcontroller-based systems requiring low-power, reliable data retention.

For engineers reviewing the 25AA080AT-I/SN datasheet, 25AA080AT-I/SN pinout, 25AA080AT-I/SN application, or 25AA080AT-I/SN equivalent, key selection criteria include voltage compatibility (1.8 V min), page size (16 B), write endurance (1M cycles), hold functionality for interrupt handling, and hardware write protection via WP pin and status register.

Technical Context

The 25AA080AT-I/SN implements a SPI Mode 0,0/1,1 interface with separate SI and SO lines, supporting up to 10 MHz clock frequency at 4.5–5.5 V. Its internal architecture includes a write enable latch, status register with WIP/WEL/BP bits, and page latches enabling atomic 16-byte writes within aligned boundaries.

Hardware data protection combines power-on reset of the write enable latch, dedicated WP pin controlled by WPEN bit, and block protection covering none, 1/4, 1/2, or all memory (0000h–03FFh). The HOLD pin suspends ongoing SPI transfers without resetting sequence state, allowing host MCU to service higher-priority interrupts.

Key Specifications

Pinout & Package

25AA080AT-I/SN is housed in an 8-lead SOIC package (SN), measuring 4.90 mm × 3.90 mm × 1.75 mm, RoHS-compliant and Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080AT-I/SN, 25LC080AT-I/SN excludes 1.8 V operation but maintains identical packaging and timing, while AT25080B-SSHL-T offers second-source availability at the cost of higher active current and non-identical register mapping.

Availability

25AA080AT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and consumer appliance settings retention requiring stable component supply and long-term lifecycle support.

Supply support for 25AA080AT-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with emphasis on embedded control and reliability.

The 25AA080A/B series is designed for low-voltage, low-power serial EEPROM applications in space-constrained, cost-sensitive embedded systems where robust SPI interface and long data retention are essential.

FAQ

What is the minimum supply voltage supported by the 25AA080AT-I/SN?

The 25AA080AT-I/SN supports a minimum supply voltage of 1.8 V, enabling direct integration with modern low-voltage microcontrollers and battery-powered systems without level-shifting circuitry. This distinguishes it from the 25LC080A variant, which requires ≥2.5 V. Operation down to 1.8 V is fully characterized across the industrial temperature range (−40°C to +85°C).

Does the 25AA080AT-I/SN support page write operations, and what is the maximum page size?

Yes, the 25AA080AT-I/SN supports page write operations with a maximum page size of 16 bytes. Writes must remain within a single physical page boundary (addresses aligned to 00h, 10h, 20h, etc.); crossing boundaries causes wraparound within the current page. This constraint requires firmware to manage address alignment before initiating multi-byte writes.

How does hardware write protection work on the 25AA080AT-I/SN?

Hardware write protection on the 25AA080AT-I/SN requires both the WP pin (Pin 3) to be driven low and the WPEN bit (Status Register Bit 7) to be set high. When both conditions are met, writes to the nonvolatile Status Register bits (BP0, BP1, WPEN) are blocked. All other functions-including memory reads and writes-remain fully operational.

Can the 25AA080AT-I/SN be used in systems requiring SPI Mode 1,1 timing?

Yes, the 25AA080AT-I/SN supports both SPI Mode 0,0 (CPOL = 0, CPHA = 0) and Mode 1,1 (CPOL = 1, CPHA = 1), as confirmed in the functional description section of DS21808D. The device samples SI on the rising edge and drives SO on the falling edge of SCK in both modes, ensuring interoperability with diverse host controllers.

What is the purpose of the HOLD pin on the 25AA080AT-I/SN, and how must it be used?

The HOLD pin on the 25AA080AT-I/SN pauses ongoing SPI communication without resetting internal state, allowing the host MCU to service time-critical interrupts. To activate HOLD, the pin must be pulled low while SCK is low; to resume, it must be raised high while SCK remains low. During HOLD, SI, SCK, and SO enter high-impedance states and ignore transitions except CS.