Microchip Technology 25AA080DT-I/ST

Overview

25AA080DT-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 10 MHz max clock speed, self-timed 5 ms write cycle, and hardware/software write protection via WP pin and STATUS register. Used for nonvolatile parameter storage in microcontroller-based embedded systems requiring low-power, reliable data retention.

For engineers reviewing the 25AA080DT-I/ST datasheet, 25AA080DT-I/ST pinout, 25AA080DT-I/ST application, or 25AA080DT-I/ST equivalent, key selection criteria include SPI interface compatibility, 1.8 V minimum VCC operation, TSSOP-8 package footprint, page-write boundary handling, and hardware write-protection enablement via WPEN bit and WP pin.

Technical Context

The 25AA080DT-I/ST implements a standard SPI Mode 0,0 (CPOL=0, CPHA=0) interface with separate SI and SO lines, CS-controlled selection, and HOLD pin for transaction suspension without reset. 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 WRITE command and address; page writes are limited to 32 bytes within a single physical page (000h–01Fh, 020h–03Fh, etc.). Block protection is configurable to protect none, upper 1/4, upper 1/2, or all memory via BP0/BP1 bits, while hardware write protection engages only when WP = low AND WPEN = 1.

Key Specifications

Pinout & Package

25AA080DT-I/ST is housed in an 8-lead TSSOP package (4.4 mm body width, 0.65 mm pitch), RoHS-compliant and Pb-free, with standard JEDEC footprint compatible with automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080CT-I/ST, the 25AA080DT-I/ST offers double the page buffer for faster bulk writes; compared with AT25080B-SSHL-T, it provides broader voltage flexibility and HOLD functionality essential for deterministic real-time systems.

Availability

25AA080DT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, medical device settings backup, and IoT edge node identity management requiring stable component supply across multi-year production cycles.

Supply support for 25AA080DT-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 25XX080 family targets cost-sensitive, low-power embedded systems needing reliable nonvolatile storage; designed specifically for seamless SPI integration with PIC® and other MCUs in industrial, medical, and consumer applications.

FAQ

What is the minimum supply voltage required for reliable operation of the 25AA080DT-I/ST?

The 25AA080DT-I/ST operates reliably from 1.8 V to 5.5 V. At 1.8 V, maximum clock frequency is reduced to 3 MHz, and certain AC timing parameters (e.g., TCSS, Tsu) widen accordingly. All DC characteristics-including read/write current and logic thresholds-are guaranteed across this full range, making the 25AA080DT-I/ST suitable for battery-powered systems where voltage drops below 2.5 V during discharge.

How does the HOLD pin function during an active SPI transaction on the 25AA080DT-I/ST?

The HOLD pin on the 25AA080DT-I/ST suspends SPI communication mid-sequence when pulled low while SCK is low. During HOLD, SI, SCK, and SO enter high-impedance states and ignore input transitions except CS. The internal state (address pointer, instruction latch) is preserved. Resuming requires bringing HOLD high while SCK remains low; the 25AA080DT-I/ST then continues from the exact point of suspension without retransmission.

Can the 25AA080DT-I/ST be used as a direct replacement for the 25LC080DT-I/ST in an existing design?

No-the 25AA080DT-I/ST and 25LC080DT-I/ST differ in minimum VCC: 1.8 V vs. 2.5 V. While pinout, package, and instruction set are identical, operating below 2.5 V with the 25LC080DT-I/ST violates its specifications and may cause read/write failures. The 25AA080DT-I/ST is backward-compatible in 2.5–5.5 V systems but enables new low-voltage use cases unavailable to the 25LC080DT-I/ST.

What happens if a page write command crosses a 32-byte boundary on the 25AA080DT-I/ST?

If a page write command on the 25AA080DT-I/ST attempts to write across a 32-byte boundary (e.g., starting at address 0x01F, writing 32 bytes), data wraps around to the start of the same page (0x000) instead of advancing to the next page. This overwrites previously written bytes in that page. The 25AA080DT-I/ST does not detect or prevent boundary violations-software must enforce alignment to 32-byte page boundaries before issuing WRITE commands.

How is hardware write protection enabled on the 25AA080DT-I/ST?

Hardware write protection on the 25AA080DT-I/ST requires two conditions: the WPEN bit (bit 7 of STATUS register) must be set to '1', and the WP pin (Pin 3) must be driven low. When both are true, writes to nonvolatile STATUS register bits (BP0, BP1, WPEN) are blocked-but memory array reads, writes, and volatile STATUS reads remain fully functional. WPEN is set via WRSR instruction; WP pin state is externally controlled.