Microchip Technology 25AA080BT-I/ST

Overview

25AA080BT-I/ST 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 features hardware write protection via WP pin, HOLD functionality for interrupt-safe bus suspension, and operates across –40°C to +85°C industrial temperature range in TSSOP-8 package. Used for firmware storage, calibration data retention, and configuration memory in microcontroller-based embedded systems.

For engineers reviewing the 25AA080BT-I/ST datasheet, 25AA080BT-I/ST pinout, 25AA080BT-I/ST application, or 25AA080BT-I/ST equivalent, key selection criteria include VCC compatibility (1.8–5.5 V), 16-byte page size, TSSOP-8 footprint, industrial temperature rating, and SPI timing compliance up to 10 MHz at 4.5–5.5 V.

Technical Context

The 25AA080BT-I/ST implements a standard SPI Mode 0,0/Master-Slave interface with separate SI (data-in) and SO (data-out) lines, requiring CS, SCK, and HOLD control signals. 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 16-byte boundaries.

It supports sequential read with automatic address increment, self-timed erase/write cycles (max 5 ms), and configurable block protection (none/1/4/1/2/all array). Power-on reset clears the write-enable latch, and built-in circuitry prevents inadvertent writes during power transitions.

Key Specifications

Pinout & Package

25AA080BT-I/ST is housed in an 8-lead TSSOP package (4.4 mm body width, 0.65 mm pitch), RoHS-compliant and Pb-free, optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080BT-I/ST, the 25AA080AT-I/ST offers identical functionality and pinout, while the AT25080B-SSHL-T trades HOLD support and 1.8 V compatibility for larger page size and alternate packaging - making it viable only where those specific features are unnecessary.

Availability

25AA080BT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control module designs requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for 25AA080BT-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 microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25AA080B family delivers cost-effective, SPI-compatible EEPROMs targeting embedded systems needing reliable, low-voltage, page-erasable nonvolatile storage for configuration, calibration, and event logging.

FAQ

What is the maximum SPI clock frequency supported by the 25AA080BT-I/ST?

The 25AA080BT-I/ST supports up to 10 MHz SPI clock frequency when VCC is 4.5–5.5 V. At 2.5–4.5 V, the maximum is 5 MHz, and at 1.8–2.5 V, it drops to 3 MHz. These limits are defined in Table 1-2 AC Characteristics and ensure reliable setup/hold timing across voltage and temperature ranges.

Does the 25AA080BT-I/ST support page write operations, and what is the page size?

Yes, the 25AA080BT-I/ST supports page write operations with a fixed 16-byte page size. Up to 16 bytes can be written in a single transaction provided they reside within the same 16-byte-aligned boundary (e.g., addresses 0000h–000Fh). Crossing the boundary causes wraparound within the current page, not continuation to the next.

How does the HOLD pin function on the 25AA080BT-I/ST, and what are its timing requirements?

The HOLD pin on the 25AA080BT-I/ST pauses ongoing SPI communication without resetting the internal state. To activate HOLD, the pin must be pulled low while SCK is low; to resume, it must be raised high while SCK remains low. Setup and hold times are 20–80 ns depending on VCC, per Table 1-2 parameters THS and THH.

Can the 25AA080BT-I/ST be used in a 1.8 V system, and what are the implications for timing?

Yes, the 25AA080BT-I/ST is fully specified for 1.8–5.5 V operation. At 1.8 V, maximum SPI clock drops to 3 MHz, and AC timing parameters (e.g., TCSS, Tsu, TV) relax to accommodate slower edge rates - all values are explicitly listed in Table 1-2 for the 1.8–2.5 V range.

What protection mechanisms prevent unintended writes to the 25AA080BT-I/ST memory array?

The 25AA080BT-I/ST employs multiple safeguards: a write-enable latch (WEL) that must be set via WREN instruction before each write; hardware write protection via WP pin + WPEN bit; block protection bits (BP0/BP1) to lock memory segments; and power-on reset that clears WEL. All are documented in Sections 2.4–2.7 of DS21808D.