Microchip Technology 25AA080/SN

Overview

25AA080/SN from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 1.8–5.5 V supply range, and industrial temperature rating (−40°C to +85°C). It features 16-byte page write, 5 ms max internal write cycle time, hardware write protection via WP pin, and HOLD functionality for interrupt-safe serial communication - used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.

For engineers reviewing the 25AA080/SN datasheet, 25AA080/SN pinout, 25AA080/SN application, or 25AA080/SN equivalent, key selection criteria include its 1 MHz max clock frequency at 1.8 V, 500 nA typical standby current, block-level write protection (0/¼/½/all array), SPI Mode 0,0 compatibility, and SOIC-8 (150 mil) package suitability for space-constrained industrial PCBs.

Technical Context

The 25AA080/SN implements a standard SPI interface with separate SI (data in) and SO (data out) lines, CS-controlled device selection, and SCK-synchronized communication. Its internal architecture includes a status register with WIP, WEL, BP0/BP1, and WPEN bits, enabling programmable block protection and hardware write-disable control.

It supports sequential read across address boundaries with automatic rollover from 03FFh to 0000h, and page write up to 16 bytes within the same 16-byte-aligned page. The HOLD pin suspends ongoing transfers without resetting the internal state, allowing host MCU servicing of higher-priority interrupts while preserving SPI context.

Key Specifications

Pinout & Package

8-pin SOIC (150 mil) package per JEDEC MS-012, with gull-wing leads, 1.27 mm pitch, and 3.91 mm × 4.90 mm body dimensions - suitable for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080T-I/SN, the 25AA080/SN offers identical functionality in tube packaging for prototyping, while 25LC080-I/SN provides higher-speed operation at the cost of 1.8 V compatibility - making the original part optimal for ultra-low-voltage, cost-sensitive industrial applications where 1 MHz bandwidth suffices.

Availability

25AA080/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, automotive body control modules, and smart energy meter firmware backup requiring stable component supply and long-term lifecycle support.

Supply support for 25AA080/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 microcontroller, analog, and Flash-IP solutions, serving industrial, automotive, and consumer markets with high-reliability semiconductor products.

The 25AA080/SN belongs to Microchip's legacy SPI Serial EEPROM product line, designed specifically for low-voltage, low-power nonvolatile data storage in resource-constrained embedded systems with stringent longevity and robustness requirements.

FAQ

What is the maximum clock frequency supported by the 25AA080/SN?

The 25AA080/SN supports a maximum clock frequency of 1 MHz when VCC is between 1.8 V and 5.5 V. This limit applies across the full industrial temperature range (−40°C to +85°C) and is specified in the AC Characteristics table of the DS21230E datasheet. Higher frequencies are not guaranteed and may result in communication errors or data corruption.

Does the 25AA080/SN require external pull-up resistors on its SPI lines?

The 25AA080/SN does not require external pull-up resistors on SI, SO, or SCK lines because it uses CMOS-compatible inputs and outputs with defined logic thresholds. However, the CS and WP pins should be pulled high via external resistors (typically 4.7 kΩ to VCC) in most designs to ensure deterministic startup and prevent unintended write protection activation.

How does the HOLD function operate during an active SPI transaction on the 25AA080/SN?

The HOLD function on the 25AA080/SN pauses an ongoing SPI transaction when the HOLD pin is driven low while SCK is low. During hold, SI, SCK, and SO enter high-impedance states and all inputs except CS are ignored. Communication resumes from the exact point of interruption when HOLD is returned high with SCK still low - preserving the internal address pointer and command state without reinitialization.

Can the 25AA080/SN be used in a 1.8 V system without level shifters?

Yes, the 25AA080/SN is fully specified for operation down to 1.8 V VCC and supports valid logic levels (VIH1 ≥ 2.0 V, VIL1 ≤ 0.8 V) at that voltage. When interfaced with a 1.8 V microcontroller SPI port, no level shifting is required - both input thresholds and output drive strength meet 1.8 V system compatibility requirements per DC Characteristics Table D001–D004.

What happens to the write enable latch after a power cycle of the 25AA080/SN?

Upon power-up, the write enable latch in the 25AA080/SN is automatically reset (WEL = 0), disabling all write operations until an explicit WREN instruction is issued. This behavior is documented in Section 3.8 (Power-On State) and ensures data integrity by preventing accidental writes during power ramp-up or brownout conditions.