Microchip Technology 25AA080C-I/SN

Overview

25AA080C-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 the industrial temperature range (−40°C to +85°C) in an 8-lead SOIC 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/SN datasheet, 25AA080C-I/SN pinout, 25AA080C-I/SN application, or 25AA080C-I/SN equivalent, key selection criteria include SPI interface compatibility, 1.8 V minimum VCC support, page-write capability, hardware write protection via WP pin, and industrial-grade reliability with >1M endurance cycles and >200-year data retention.

Technical Context

The 25AA080C-I/SN implements a standard SPI Mode 0,0 (CPOL = 0, CPHA = 0) interface with separate SI and SO lines, CS-controlled selection, and HOLD-enabled transaction pausing. Its internal architecture includes a write-enable latch, STATUS register with BP0/BP1 block protection bits, and nonvolatile WPEN control for hardware write protection.

It uses self-timed internal write cycles (≤5 ms), supports sequential read with automatic address increment, and enforces page-boundary alignment for multi-byte writes-requiring software to avoid crossing 16-byte boundaries during page writes. Power-on reset clears the write-enable latch and places SO in high-impedance state.

Key Specifications

Pinout & Package

25AA080C-I/SN is housed in an 8-lead SOIC (Small Outline Integrated Circuit) package, 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant and Pb-free. Pin 1 is marked by a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080C-I/SN, the 25LC080C-I/SN offers identical functionality above 2.5 V but excludes low-voltage capability, while the AT25080B-SSHL-T omits HOLD support and requires revised driver logic - making 25AA080C-I/SN the optimal choice for new 1.8 V–5.5 V designs needing robust transaction control and long-term data integrity.

Availability

25AA080C-I/SN is available at Aetrix Electronics and suitable for smart metering, industrial sensor nodes, automotive body control modules, and medical diagnostic equipment requiring stable component supply across extended production lifecycles.

Supply support for 25AA080C-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 25AA080C-I/SN belongs to Microchip's serial EEPROM product line, engineered for robust, low-power nonvolatile data storage in resource-constrained embedded systems where reliability and broad voltage compatibility are critical.

FAQ

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

The 25AA080C-I/SN operates reliably down to 1.8 V, enabling direct integration with modern ultra-low-power microcontrollers and battery-powered systems. Below 1.8 V, read/write functionality is not guaranteed, and the device may fail to respond to SPI commands or complete internal write cycles. Always maintain VCC within 1.8–5.5 V for full specification compliance.

Does the 25AA080C-I/SN support page write operations, and what is the maximum byte count per page?

Yes, the 25AA080C-I/SN supports page write operations with a fixed 16-byte page size. Up to 16 bytes can be written in a single command, provided all addresses fall within the same physical page boundary (e.g., 0x000–0x00F). Crossing a page boundary causes wraparound - writing beyond 0x00F in that page overwrites data starting at 0x000 - so firmware must enforce page-aligned writes.

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

The HOLD pin on the 25AA080C-I/SN pauses an ongoing SPI transaction without resetting internal state. When pulled low while SCK is low, SI, SO, and SCK inputs are ignored, and SO enters high-impedance. The device retains its position in the instruction/address/data stream and resumes exactly where it left off when HOLD is returned high (also while SCK is low). This enables deterministic interrupt handling in time-critical systems.

Can the 25AA080C-I/SN be used with a 5 V microcontroller SPI interface without level shifting?

Yes, the 25AA080C-I/SN is fully 5 V tolerant on all inputs (CS, SI, SCK, HOLD, WP) and operates natively at 5.5 V VCC. Its VIH threshold is 0.7×VCC (≥3.5 V at 5 V), and VOL is ≤0.4 V at 2.1 mA - ensuring clean logic-level compatibility with standard 5 V CMOS outputs. No external level shifters are needed for 5 V SPI master interfaces.

What write protection mechanisms are implemented in the 25AA080C-I/SN?

The 25AA080C-I/SN implements dual-layer write protection: (1) hardware-based, using the WP pin in conjunction with the nonvolatile WPEN bit in the STATUS register to lock the STATUS register itself; and (2) software-configurable block protection via BP0/BP1 bits, allowing users to protect none, the top 1/4, top 1/2, or the entire 1024-byte memory array against accidental writes.