Microchip Technology 25AA080CT-I/SN

Overview

25AA080CT-I/SN from Microchip Technology is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 16-byte page size, and 1.8–5.5 V supply range. It supports up to 10 MHz clock frequency, delivers 5 mA read/write current at 5.5 V, and operates across –40°C to +85°C industrial temperature range in 8-lead SOIC (SN) package. It is used for nonvolatile parameter storage in microcontroller-based embedded systems requiring low-power, reliable data retention.

For engineers reviewing the 25AA080CT-I/SN datasheet, 25AA080CT-I/SN pinout, 25AA080CT-I/SN application, or 25AA080CT-I/SN equivalent, key selection criteria include SPI interface compatibility, 16-byte page write capability, hardware write protection via WP pin, HOLD functionality for interrupt-safe bus arbitration, and industrial-grade temperature operation with >1M endurance cycles.

Technical Context

The 25AA080CT-I/SN implements a standard SPI Mode 0,0 or Mode 1,1 serial interface with separate SI (data in), SO (data out), SCK (clock), CS (chip select), WP (write-protect), and HOLD (bus pause) signals. Its internal architecture includes a write-enable latch, STATUS register with WIP/WEL/BP bits, and page latches enabling self-timed 5 ms max write cycles.

It features dual-level write protection: software-configurable block protection (BP0/BP1) for 0%, 25%, 50%, or 100% array coverage, and hardware-enforced protection when WP is low and WPEN bit is set. The device powers on with WEL reset and enters standby mode when CS is high, drawing only 5 µA at 5.5 V.

Key Specifications

Pinout & Package

8-lead SOIC (SN) package, 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080CT-I/SN and AT25080B-MAHL-T, the 25AA080CT-I/SN uniquely supports full 1.8 V operation while retaining HOLD and identical Microchip ecosystem compatibility - making it optimal for ultra-low-voltage embedded designs requiring deterministic bus control.

Availability

25AA080CT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware storage, medical device configuration, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 25AA080CT-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 25AA080CT-I/SN belongs to Microchip's 25XX080C/D family of SPI Serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in resource-constrained embedded systems across industrial, medical, and automotive markets.

FAQ

What is the maximum clock frequency supported by the 25AA080CT-I/SN?

The 25AA080CT-I/SN supports up to 10 MHz clock frequency when VCC is 4.5–5.5 V. At 2.5–4.5 V, max frequency drops to 5 MHz, and at 1.8–2.5 V, it is limited to 3 MHz. These stepped limits ensure timing margin across voltage ranges and are defined in Table 1-2 of the DS22151B datasheet. All timing parameters (e.g., TCSS, Tsu) scale accordingly to maintain robust SPI communication for the 25AA080CT-I/SN.

Does the 25AA080CT-I/SN support page write operations, and what is the page size?

Yes, the 25AA080CT-I/SN supports page write operations with a fixed 16-byte page size, as confirmed in the Device Selection Table and Section 2.3. Up to 16 bytes can be written in a single command, provided they reside within the same physical page boundary (addresses 0000h–000Fh, 0010h–001Fh, etc.). Crossing a page boundary causes data to wrap within the current page - a behavior explicitly documented for the 25AA080CT-I/SN.

How does hardware write protection work on the 25AA080CT-I/SN?

Hardware write protection on the 25AA080CT-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 nonvolatile STATUS register bits are blocked. The 25AA080CT-I/SN remains fully functional for reads and unprotected memory writes. This dual-condition scheme prevents accidental lockout during board bring-up or firmware updates.

What is the purpose of the HOLD pin on the 25AA080CT-I/SN, and how is it used?

The HOLD pin on the 25AA080CT-I/SN suspends an ongoing SPI transaction without resetting internal state, allowing the host MCU to service higher-priority interrupts and resume transmission from the exact bit position. To activate, HOLD must be pulled low while SCK is low; resuming requires bringing HOLD high while SCK remains low. This deterministic behavior is critical for real-time systems using the 25AA080CT-I/SN in shared SPI buses.

What are the endurance and data retention specifications for the 25AA080CT-I/SN?

The 25AA080CT-I/SN guarantees >1 million erase/write cycles and >200 years of data retention at 25°C, as specified in Table 1-3 (Param. 21) and Section 1.0 of DS22151B. These values are characterized, not tested per unit, and apply under standard operating conditions (VCC = 5.5 V). Endurance degrades predictably with temperature and voltage - detailed modeling is available via Microchip's Total Endurance™ tool for the 25AA080CT-I/SN.