Microchip Technology 25AA080C-I/P

Overview

25AA080C-I/P from Microchip Technology is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 16-byte page write capability, and 1.8–5.5 V supply range. It features hardware write protection via WP pin, HOLD functionality for interrupt-safe bus suspension, and operates across the industrial temperature range (−40°C to +85°C) in an 8-lead PDIP package. It is used for nonvolatile parameter storage in microcontroller-based embedded systems requiring low-power, reliable data retention.

For engineers reviewing the 25AA080C-I/P datasheet, 25AA080C-I/P pinout, 25AA080C-I/P application, or 25AA080C-I/P equivalent, key selection criteria include V_CC min (1.8 V), page size (16 B), clock frequency (up to 10 MHz at 4.5–5.5 V), standby current (1 µA at +85°C), and SPI mode compatibility (Mode 0,0 and Mode 1,1).

Technical Context

The 25AA080C-I/P implements a standard SPI interface with separate SI (MOSI) and SO (MISO) lines, supporting full-duplex command/data transfer synchronized by SCK. Its internal architecture includes a write-enable latch, STATUS register with WIP/WEL/BP bits, and hardware-controlled block protection enabling selective 0%, 25%, 50%, or 100% array write-protection.

It supports sequential read with automatic address increment, byte/page write with self-timed erase/write cycles (≤5 ms), and HOLD-driven pause/resume of ongoing serial transfers without sequence restart. All operations are validated under industrial temperature conditions and require CS low assertion for device selection and active communication.

Key Specifications

Pinout & Package

8-lead Plastic Dual In-Line Package (PDIP), 300 mil body width, through-hole mounting. RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080C-I/P, 25LC080C-I/P offers identical functionality above 2.5 V but excludes 1.8 V operation, while AT25080B-PU removes HOLD and hardware WP-reducing design resilience in real-time systems requiring deterministic bus arbitration and physical write lockout.

Availability

25AA080C-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and consumer appliance settings requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 25AA080C-I/P 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 25AA080C-I/P belongs to Microchip's serial EEPROM product line, designed specifically for low-voltage, high-reliability nonvolatile storage in resource-constrained embedded systems where SPI interface simplicity, robust write protection, and extended data retention are critical.

FAQ

What is the minimum supply voltage required for reliable operation of the 25AA080C-I/P?

The 25AA080C-I/P operates reliably down to 1.8 V across the full industrial temperature range (−40°C to +85°C). At this voltage, maximum clock frequency is 3 MHz, and DC/AC timing parameters remain fully specified per DS22151B. Below 1.8 V, functionality is not guaranteed and may result in incomplete writes or read errors. The 25AA080C-I/P is distinct from the 25LC080C-I/P, which requires a minimum of 2.5 V.

Does the 25AA080C-I/P support both SPI Mode 0,0 and Mode 1,1?

Yes, the 25AA080C-I/P supports both SPI Mode 0,0 (CPOL = 0, CPHA = 0) and Mode 1,1 (CPOL = 1, CPHA = 1), as confirmed in the Functional Description section of DS22151B. This dual-mode compatibility allows seamless integration with diverse microcontrollers-including PIC®, ARM Cortex-M, and ESP32-without requiring hardware modifications or clock polarity inversion in firmware.

How does the HOLD pin function during an active SPI transaction on the 25AA080C-I/P?

The HOLD pin on the 25AA080C-I/P suspends an ongoing SPI transaction when pulled low while SCK is low, placing SI, SO, and SCK in high-impedance states and preserving internal state. Communication resumes upon returning HOLD high while SCK remains low. This enables the host MCU to service time-critical interrupts without restarting the entire sequence-a key advantage over EEPROMs lacking HOLD support.

Can the 25AA080C-I/P be used as a direct replacement for the 24C08 I²C EEPROM?

No, the 25AA080C-I/P is not a direct replacement for the 24C08 because it uses SPI-not I²C-interface signaling. It requires four dedicated lines (CS, SCK, SI, SO) versus two for I²C (SDA, SCL), and uses different command protocols, timing, and addressing. Migration requires PCB layout changes and firmware driver rewrite. For I²C-based designs, consider Microchip's 24AA080C instead.

What is the purpose of the WP pin on the 25AA080C-I/P, and how is it enabled?

The WP (Write-Protect) pin on the 25AA080C-I/P provides hardware-level protection for the STATUS register's nonvolatile bits (BP0, BP1, WPEN) when asserted low-but only if the WPEN bit in the STATUS register is set to '1'. When WP is low and WPEN = 1, writes to those bits are blocked; memory array writes remain unaffected unless BP bits are configured. WP has no effect when WPEN = 0, allowing flexible factory programming even with WP grounded.