Microchip Technology 25AA080D-I/ST

Overview

25AA080D-I/ST from Microchip Technology 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 hardware write protection via WP pin, HOLD functionality for interrupt-safe bus suspension, and self-timed 5 ms max write cycles. Used in microcontroller-based systems for configuration storage, calibration data retention, and firmware parameter logging.

For engineers reviewing the 25AA080D-I/ST datasheet, 25AA080D-I/ST pinout, 25AA080D-I/ST application, or 25AA080D-I/ST equivalent, key selection criteria include SPI timing compliance at 1.8 V, page-write boundary handling, WPEN-controlled hardware write protection, and TSSOP-8 package compatibility with high-density PCB layouts.

Technical Context

The 25AA080D-I/ST implements a standard SPI Mode 0,0 interface (CPOL = 0, CPHA = 0) with separate SI/SO lines and active-low CS. Its internal architecture includes a 1024 × 8-bit EEPROM array, page latches, HV generator for write/erase, and status register with WIP, WEL, BP0/BP1, and WPEN bits.

Write operations require explicit WREN instruction followed by CS high after final data bit; page writes are limited to 32 bytes within a single physical page (000h–01Fh, 020h–03Fh, etc.). HOLD suspends ongoing transfers while preserving internal state, enabling host CPU to service higher-priority interrupts without reinitializing the sequence.

Key Specifications

Pinout & Package

25AA080D-I/ST is packaged in an 8-lead TSSOP (4.4 mm body width), RoHS-compliant, with 0.65 mm pitch and surface-mount footprint optimized for automated assembly and thermal performance in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080D-I/ST, 25LC080D-I/ST offers identical functionality at higher minimum voltage, while AT25080B-SSHL-T sacrifices HOLD capability for Atmel ecosystem compatibility - making 25AA080D-I/ST optimal for 1.8 V–5.5 V designs requiring deterministic bus suspension.

Availability

25AA080D-I/ST is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive body electronics, and smart metering applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for 25AA080D-I/ST 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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25AA080D-I/ST belongs to Microchip's 25XX080 family of SPI EEPROMs, designed specifically for robust, low-voltage, high-reliability nonvolatile storage in resource-constrained embedded systems.

FAQ

What is the minimum supply voltage required for reliable operation of the 25AA080D-I/ST?

The 25AA080D-I/ST operates reliably from 1.8 V to 5.5 V. At 1.8 V, AC timing parameters (e.g., clock frequency ≤ 3 MHz, setup/hold times relaxed) must be observed per Table 1-2. Below 1.8 V, the device may fail to execute write cycles or respond to SPI commands - always verify VCC against the actual operating conditions in your 25AA080D-I/ST design.

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

The HOLD pin on the 25AA080D-I/ST suspends ongoing SPI communication when pulled low while SCK is low, preserving the internal address pointer and command state. SO, SI, and SCK enter high-impedance states, allowing the host MCU to service interrupts. To resume, bring HOLD high while SCK remains low - the 25AA080D-I/ST continues exactly where it left off without retransmission.

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

No. The 25AA080D-I/ST restricts page writes to a single 32-byte physical page (e.g., addresses 000h–01Fh). Attempting to write across a boundary (e.g., starting at 01Eh with 4 bytes) wraps data to the start of the same page, overwriting prior content. Application firmware must validate address alignment before issuing WRITE commands to avoid unintended data loss in the 25AA080D-I/ST.

What protection mechanisms prevent accidental writes to the 25AA080D-I/ST memory array?

The 25AA080D-I/ST 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 when WPEN = 1. These layers ensure that only intentional, authorized writes modify memory - critical for field reliability of the 25AA080D-I/ST.

Is the 25AA080D-I/ST pin-compatible with other 8-lead TSSOP SPI EEPROMs?

The 25AA080D-I/ST uses standard SPI pinout (CS, SO, WP, VSS, SI, SCK, HOLD, VCC) in 8-lead TSSOP, matching industry conventions. However, pin compatibility does not guarantee functional equivalence: competing parts may lack HOLD, use different status register bits, or omit WPEN control. Always verify timing, instruction set, and protection logic before substituting - the 25AA080D-I/ST's HOLD and WPEN features are not universally replicated.