Microchip Technology 25LC080A-I/ST

Overview

25LC080A-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, and industrial temperature range (−40°C to +85°C). It features hardware write protection via WP pin, HOLD suspend functionality, and operates from 2.5V to 5.5V - used for firmware storage, configuration data retention, and parameter logging in embedded control systems.

For engineers reviewing the 25LC080A-I/ST datasheet, 25LC080A-I/ST pinout, 25LC080A-I/ST application, or 25LC080A-I/ST equivalent, key selection criteria include VCC range compatibility (2.5–5.5V), 16-byte page write constraint, SPI Mode 0,0/1,1 support, and TSSOP-8 package footprint for space-constrained PCB layouts.

Technical Context

The 25LC080A-I/ST implements a standard SPI interface with separate SI (data in) and SO (data out) lines, requiring CS, SCK, and optional HOLD/WP signals. Its internal architecture includes a write-enable latch, status register with WIP/WEL/BP bits, and page latches enabling up to 16-byte burst writes within a single physical page boundary.

It supports sequential read with automatic address increment, self-timed erase/write cycles (5 ms max), and block write protection covering none, 1/4, 1/2, or all of the 1024-byte array. Power-on defaults include standby mode, reset write-enable latch, and high-impedance SO output.

Key Specifications

Pinout & Package

25LC080A-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 automated surface-mount assembly and compact board layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080A-I/ST, the 25AA080A-I/ST offers lower-voltage operation but lacks automotive qualification, while the AT25080B-SSHL-T provides functional equivalence with minor register-level firmware adjustments needed for status monitoring.

Availability

25LC080A-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy meter firmware requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 25LC080A-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 25LC080A-I/ST belongs to Microchip's 25XX080A/B serial EEPROM product line, engineered for robust, low-power nonvolatile storage in resource-constrained embedded systems requiring SPI interface simplicity and industrial-grade reliability.

FAQ

What is the maximum clock frequency supported by the 25LC080A-I/ST?

The 25LC080A-I/ST supports a maximum clock frequency of 10 MHz when VCC is 4.5V to 5.5V. At 2.5V ≤ VCC < 4.5V, the limit drops to 5 MHz, and at 1.8V ≤ VCC < 2.5V (not applicable to 25LC080A-I/ST due to its 2.5V min VCC), it would be 3 MHz. These values are defined in Table 1-2 of the DS21808D datasheet and directly impact SPI throughput in host MCU implementations.

Does the 25LC080A-I/ST require external pull-up resistors on its SPI lines?

The 25LC080A-I/ST does not require external pull-ups on SI, SO, or SCK - these pins are actively driven. However, CS and WP are active-low inputs with internal weak pull-ups disabled by default; external pull-ups (typically 4.7kΩ to VCC) are recommended for CS to ensure reliable deselection during power-up and for WP to prevent unintended write protection activation in floating conditions.

How does page write operation work in the 25LC080A-I/ST?

A page write in the 25LC080A-I/ST allows up to 16 bytes to be loaded into the page buffer before triggering an internal 5 ms write cycle. All bytes must reside within the same 16-byte physical page (e.g., addresses 0x000–0x00F); crossing a boundary causes wraparound to the page start. The 25LC080A-I/ST uses this mechanism to reduce write overhead versus byte-by-byte programming.

Can the 25LC080A-I/ST be used in automotive applications?

The 25LC080A-I/ST is specified for Industrial temperature range (−40°C to +85°C), not Automotive (−40°C to +125°C). While it may function thermally in some under-hood environments, Microchip does not qualify or guarantee performance beyond its rated Industrial grade. For automotive use, select the 25LC080A-E/ST variant, which carries the 'E' suffix and full AEC-Q100 alignment.

What happens to the write-enable latch after a successful write operation on the 25LC080A-I/ST?

After any successful WRITE, WRSR, or WRDI instruction, the write-enable latch (WEL bit in Status Register) is automatically reset to '0'. This means the 25LC080A-I/ST requires an explicit WREN command before each discrete write or page write sequence - a safety feature preventing unintended modifications during firmware execution or interrupt handling.