Microchip Technology 25AA080D-I/SN

Overview

25AA080D-I/SN from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 32-byte page size, and 1.8–5.5 V supply range. It supports up to 10 MHz clock frequency, features hardware write protection via WP pin and STATUS register, and operates across industrial temperature (−40°C to +85°C). It is used in embedded systems for nonvolatile parameter storage, firmware configuration, and calibration data retention.

For engineers reviewing the 25AA080D-I/SN datasheet, 25AA080D-I/SN pinout, 25AA080D-I/SN application, or 25AA080D-I/SN equivalent, key selection criteria include page-write capability (32 bytes), low-voltage operation (1.8 V min), HOLD/CS-controlled pause/resume functionality, and block protection granularity (none/¼/½/all array).

Technical Context

The 25AA080D-I/SN implements a standard SPI Mode 0,0 interface with separate SI (data-in) and SO (data-out) lines, requiring only CS, SCK, SI, SO, WP, HOLD, VCC, and VSS. Its internal architecture includes a 32-byte page latch, status register with WIP/WEL/BP0/BP1 bits, and high-voltage generator for EEPROM programming.

Write operations require explicit WREN instruction followed by WRITE command and address; CS rising edge initiates self-timed internal write cycle (≤5 ms). HOLD pin suspends ongoing serial transfers without resetting state, enabling host interrupt servicing while preserving transaction context.

Key Specifications

Pinout & Package

25AA080D-I/SN is packaged in 8-lead SOIC (SN), with 3.9 mm × 4.9 mm body, gull-wing leads, and RoHS-compliant matte tin finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080C-I/SN and AT25080B-SSHL-T, the 25AA080D-I/SN uniquely balances 1.8 V operation, 32-byte page efficiency, and Microchip's robust block protection model-making it optimal for new low-voltage embedded designs requiring fast, secure configuration storage.

Availability

25AA080D-I/SN 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 and long-term lifecycle support.

Supply support for 25AA080D-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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25AA080D-I/SN belongs to Microchip's 25XX080 family of SPI EEPROMs, designed specifically for reliable, low-power, pin-efficient nonvolatile storage in space-constrained embedded systems.

FAQ

What is the maximum clock frequency supported by the 25AA080D-I/SN?

The 25AA080D-I/SN supports up to 10 MHz clock frequency when VCC is 4.5 V to 5.5 V, 5 MHz at 2.5 V to <4.5 V, and 3 MHz at 1.8 V to <2.5 V. These graded limits ensure signal integrity and timing margin across its full 1.8–5.5 V operating range. The 25AA080D-I/SN datasheet specifies AC characteristics for each voltage band, and all timing parameters (e.g., setup/hold times) scale accordingly to maintain reliable SPI communication.

How does the HOLD pin function during an active SPI transaction on the 25AA080D-I/SN?

The HOLD pin on the 25AA080D-I/SN pauses ongoing SPI communication without resetting internal state. When pulled low while SCK is low, it places SI, SCK, and SO in high-impedance and ignores further input transitions (except CS). To resume, HOLD must be raised while SCK remains low. This allows the host MCU to service urgent interrupts and continue the exact same transaction-critical for real-time systems. The 25AA080D-I/SN maintains address pointer and instruction context throughout the hold period.

What page size does the 25AA080D-I/SN use, and why does it matter compared to the 'C' version?

The 25AA080D-I/SN uses a 32-byte page size, double that of the 25AA080C-I/SN (16 bytes). This enables more efficient bulk writes: up to 32 bytes can be clocked in before triggering the internal ≤5 ms write cycle. For applications performing frequent multi-byte updates-such as saving sensor calibration sets or UI preferences-the 25AA080D-I/SN reduces total programming time and host CPU overhead versus the 'C' variant.

Can the 25AA080D-I/SN operate reliably at 1.8 V, and what are the trade-offs?

Yes, the 25AA080D-I/SN is fully specified down to 1.8 V, supporting read/write operations and all features-including HOLD, WP, and STATUS register access-at this minimum supply. Trade-offs include reduced maximum clock frequency (3 MHz), slightly longer timing parameters (e.g., 150 ns CS setup), and higher relative current consumption per MHz. However, its 5 µA standby current and 2.5 mA read current at 2.5 V/5 MHz make it exceptionally well-suited for battery-powered IoT endpoints where the 25AA080D-I/SN delivers optimal energy-per-bit efficiency.

How is write protection implemented on the 25AA080D-I/SN, and can it protect individual memory regions?

Write protection on the 25AA080D-I/SN uses two layers: software-configurable block protection (BP0/BP1 bits in STATUS register) and hardware-enabled pin-based protection (WP pin + WPEN bit). BP0/BP1 allow four protection levels-none, upper 1/4 (0300h–03FFh), upper 1/2 (0200h–03FFh), or full array (0000h–03FFh)-enabling region-specific locking of calibration data or firmware metadata. The WP pin, when enabled via WPEN, adds physical write-disable for the STATUS register itself, preventing accidental changes to protection settings. This dual-layer scheme makes the 25AA080D-I/SN highly secure for safety-critical storage.