Microchip Technology 25AA010A-I/SN

Overview

25AA010A-I/SN from Microchip Technology Inc. is a 1 Kbit (128 × 8) SPI-compatible serial EEPROM with 1.8–5.5 V supply, 10 MHz max clock, 16-byte page write capability, and industrial temperature range (−40°C to +85°C). It features hardware write protection (WP pin), HOLD functionality for interrupt-safe bus suspension, and block-level write protection (none/¼/½/all array). Used in microcontroller-based systems for configuration storage, calibration data retention, and firmware parameter backup.

For engineers reviewing the 25AA010A-I/SN datasheet, 25AA010A-I/SN pinout, 25AA010A-I/SN application, or 25AA010A-I/SN equivalent, key selection criteria include its 1.8 V minimum operating voltage, 5 µA standby current at 5.5 V, self-timed 5 ms max write cycle, SPI Mode 0/1 compatibility, and SOIC-8 (SN) package footprint - critical for low-power embedded, industrial control, and automotive body electronics designs.

Technical Context

The 25AA010A-I/SN implements a standard SPI interface with separate SI (MOSI), SO (MISO), SCK, CS, WP, HOLD, and VCC/VSS pins. It supports both byte and page write modes, with automatic address incrementing during sequential reads and wraparound at 0x7F. The internal STATUS register provides real-time WIP and WEL status plus BP0/BP1 block protection bits.

Its architecture includes an 8-bit instruction register, high-voltage generator for EEPROM programming, page latches for burst writes, and built-in power-on reset logic that clears the write enable latch. Write operations require explicit WREN instruction, CS high-to-low transition initiation, and CS high assertion after final data bit to trigger the 5 ms internal TWC cycle.

Key Specifications

Pinout & Package

25AA010A-I/SN is packaged in an 8-lead SOIC (SN) with standard 150-mil width and JEDEC MS-012AC outline. Pin 1 is marked by laser dot; pin 1 location matches industry-standard SOIC orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC010A-I/SN and AT25010B-SSHL-T, the 25AA010A-I/SN uniquely supports 1.8 V operation and integrates HOLD functionality - making it optimal for ultra-low-power, interrupt-sensitive, or mixed-voltage embedded systems where voltage margin and bus arbitration are design constraints.

Availability

25AA010A-I/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended product lifecycles.

Supply support for 25AA010A-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 25AA010A belongs to Microchip's legacy serial EEPROM product line, engineered for robust, low-power, SPI-based nonvolatile storage in cost-sensitive industrial, automotive, and consumer applications where reliability and long-term data integrity are essential.

FAQ

What is the minimum supply voltage required for reliable operation of the 25AA010A-I/SN?

The 25AA010A-I/SN operates reliably down to 1.8 V across its full industrial temperature range (−40°C to +85°C). This 1.8 V minimum enables direct interfacing with low-power MCUs and battery-powered systems without level-shifting circuitry. Below 1.8 V, read/write functionality is not guaranteed per datasheet specifications, and the device may enter undefined states.

Does the 25AA010A-I/SN support page write operations, and what is the maximum page size?

Yes, the 25AA010A-I/SN supports page write mode with a fixed page size of 16 bytes. Up to 16 consecutive bytes within the same physical page (aligned to 0x00, 0x10, 0x20, etc.) can be loaded and written in a single 5 ms internal cycle. Attempting to cross a page boundary wraps data to the start of the current page - firmware must enforce alignment.

How does the HOLD pin function during an active SPI transaction on the 25AA010A-I/SN?

The HOLD pin on the 25AA010A-I/SN suspends an ongoing SPI transaction when pulled low while SCK is low. During HOLD, SI, SCK, and SO enter high-impedance states and all inputs except CS are ignored. Resuming requires bringing HOLD high while SCK remains low - the transaction continues from the exact bit position where it paused, preserving full data integrity.

What protection mechanisms prevent unintended writes to the 25AA010A-I/SN memory array?

The 25AA010A-I/SN employs three layered protections: (1) a volatile write enable latch (WEL) that resets on power-up and after every write; (2) a hardware WP pin that disables all writes when low, overriding WEL; and (3) nonvolatile BP0/BP1 bits that lock configurable memory blocks. All three must be satisfied for a write to execute.

Is the 25AA010A-I/SN pin-compatible with other Microchip serial EEPROMs in SOIC-8 packaging?

Yes, the 25AA010A-I/SN shares identical SOIC-8 (SN) pinout and electrical characteristics with the 25LC010A-I/SN and 25AA020A-I/SN (2 Kbit variant), enabling drop-in replacement where memory size and voltage range align. However, the 25AA010A-I/SN is not compatible with larger-density variants like 25AA040A due to differing instruction sets and STATUS register layouts.