Microchip Technology 25LC080AT-I/ST

Overview

25LC080AT-I/ST from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 16-byte page size, 10 MHz max clock frequency, and industrial temperature range (–40°C to +85°C). It operates from 2.5V to 5.5V and features hardware write protection via WP pin and status register control, used for firmware storage, configuration data retention, and parameter logging in embedded controllers.

For engineers reviewing the 25LC080AT-I/ST datasheet, 25LC080AT-I/ST pinout, 25LC080AT-I/ST application, or 25LC080AT-I/ST equivalent, key selection criteria include VCC range compatibility (2.5–5.5V), 16-byte page write limit, HOLD/CS timing margins, and block protection granularity (none/¼/½/all array).

Technical Context

The 25LC080AT-I/ST implements a standard SPI Mode 0,0 or 1,1 interface with separate SI and SO lines, requiring CS low and HOLD high for normal operation. Its internal architecture includes a write-enable latch, status register (WIP/WEL/BP0/BP1), and page latches enabling up to 16-byte burst writes within a single physical page boundary.

Write cycles are self-timed (max 5 ms), with built-in power-on write-disable, automatic WEL reset after write completion, and hardware/software write protection coordination via WPEN bit and WP pin. The device supports sequential read with automatic address rollover and high-impedance SO during CS high or HOLD low.

Key Specifications

Pinout & Package

25LC080AT-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 25LC080AT-I/ST, the SOIC-packaged 25LC080A-I/SN trades density for assembly flexibility, while the AT25080B-SSHL-T offers larger page size at the cost of minor register-level firmware adaptation - both require validation of HOLD timing and WPEN/WP interaction.

Availability

25LC080AT-I/ST is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, medical instrumentation, and smart energy metering requiring stable component supply across extended product lifecycles.

Supply support for 25LC080AT-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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25LCxx0A/B family delivers cost-effective, SPI-compatible EEPROMs targeting embedded systems needing reliable, low-power nonvolatile storage for configuration, calibration, and event logging.

FAQ

What is the maximum clock frequency supported by the 25LC080AT-I/ST?

The 25LC080AT-I/ST supports up to 10 MHz clock frequency when VCC is 4.5V to 5.5V. At 2.5V ≤ VCC < 4.5V, the maximum clock drops to 5 MHz, and at 1.8V ≤ VCC < 2.5V it is 3 MHz. These limits ensure reliable setup/hold timing for SI and SO signals; exceeding them risks data corruption during read or write operations. The 25LC080AT-I/ST datasheet specifies AC characteristics per voltage bin to guide system-level timing budgeting.

Does the 25LC080AT-I/ST support 1.8V operation?

No, the 25LC080AT-I/ST does not support 1.8V operation. Its specified VCC range is 2.5V to 5.5V. For 1.8V systems, Microchip offers the 25AA080A variant, which shares the same 8 Kbit capacity and 16-byte page size but extends down to 1.8V. Using the 25LC080AT-I/ST below 2.5V may result in undefined behavior, failed writes, or excessive current draw. Always verify VCC compliance before integrating the 25LC080AT-I/ST into low-voltage designs.

How does page write functionality work in the 25LC080AT-I/ST?

The 25LC080AT-I/ST has a 16-byte page buffer, allowing up to 16 bytes to be written in a single transaction if they reside within the same physical page boundary (e.g., addresses 0x000–0x00F). If a page write crosses a 16-byte boundary, data wraps to the start of the current page instead of advancing - potentially overwriting earlier bytes. The 25LC080AT-I/ST requires CS to go high after the last data bit to trigger the internal 5 ms write cycle. Software must enforce page alignment and poll the WIP bit before initiating subsequent writes.

What is the purpose of the HOLD pin on the 25LC080AT-I/ST?

The HOLD pin on the 25LC080AT-I/ST suspends ongoing SPI communication without resetting the sequence, enabling the host MCU to service higher-priority interrupts. To activate HOLD, the pin must be pulled low while SCK is low; transitions on SI, SO, and SCK are ignored during hold, and SO enters high-impedance state. Resuming requires bringing HOLD high while SCK remains low. This feature preserves bus state integrity and avoids retransmission overhead - critical in real-time systems using the 25LC080AT-I/ST for time-sensitive configuration access.

Can the 25LC080AT-I/ST be used in automotive applications requiring AEC-Q200 qualification?

No, the 25LC080AT-I/ST is rated for Industrial temperature range (–40°C to +85°C) and is not AEC-Q200 qualified. For automotive applications, Microchip offers the 25LC080B-E/ST variant, which supports the Automotive grade (–40°C to +125°C) and carries AEC-Q200 stress testing certification. Using the 25LC080AT-I/ST in under-hood or other high-temperature automotive environments may lead to parametric drift or premature failure. Always select the E-grade version and verify qualification documentation when designing for automotive use cases involving the 25LC080AT-I/ST.