Microchip Technology 25AA010AT-I/MNY

Overview

25AA010AT-I/MNY from Microchip Technology Inc. is a 1 Kbit (128 × 8) SPI Serial EEPROM with 1.8–5.5 V supply range, 10 MHz max clock frequency, 16-byte page write capability, and industrial temperature rating (–40°C to +85°C). It features hardware write protection (WP pin), HOLD function for interrupt-safe serial pauses, and block-level array protection (none/¼/½/all). Used for nonvolatile parameter storage in microcontroller-based embedded systems requiring low-power, reliable data retention.

For engineers reviewing the 25AA010AT-I/MNY datasheet, 25AA010AT-I/MNY pinout, 25AA010AT-I/MNY application, or 25AA010AT-I/MNY equivalent, key selection criteria include VCC operating range compatibility, SPI timing compliance at target clock speed, WP/HOLD signal integration, page boundary handling in firmware, and industrial-grade reliability requirements including >200-year data retention and 1 million erase/write cycles.

Technical Context

The 25AA010AT-I/MNY implements a standard SPI Mode 0,0 or Mode 1,1 interface with separate SI (data in) and SO (data out) lines, CS-controlled selection, and SCK-synchronized transfers. All instructions, addresses, and data are MSb-first, with read/write operations initiated only when CS is low and HOLD is high.

It integrates a nonvolatile STATUS register with WIP (Write-In-Process), WEL (Write Enable Latch), and BP0/BP1 (Block Protection) bits. Write protection is enforced via both software (WRSR-configured BP bits) and hardware (WP pin), while HOLD suspends ongoing serial sequences without resetting internal state-enabling host MCU to service higher-priority interrupts.

Key Specifications

Pinout & Package

25AA010AT-I/MNY is packaged in an 8-lead DFN (2 mm × 3 mm, 0.5 mm pitch) with exposed pad, marked as "MNY" per Microchip's package coding. Pin 1 is laser-marked; exposed pad may be connected to VSS or left floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC010AT-I/MNY, the 25AA010AT-I/MNY offers broader voltage compatibility down to 1.8 V, while AT25010B-MAHL-T sacrifices HOLD functionality for Atmel's architecture - making 25AA010AT-I/MNY optimal for low-voltage, interrupt-sensitive embedded systems requiring deterministic SPI pause behavior.

Availability

25AA010AT-I/MNY is available at Aetrix Electronics and suitable for motor control firmware storage, medical device calibration data retention, and automotive body controller NVM requiring stable component supply across extended production lifecycles.

Supply support for 25AA010AT-I/MNY 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 product line delivers low-voltage, SPI-compatible serial EEPROMs optimized for space-constrained, power-sensitive embedded systems requiring robust nonvolatile storage with industrial-grade reliability and simple firmware integration.

FAQ

What is the minimum supply voltage required for reliable operation of the 25AA010AT-I/MNY?

The 25AA010AT-I/MNY operates reliably from 1.8 V to 5.5 V. At 1.8 V, maximum clock frequency is reduced to 3 MHz per AC specifications, and read/write currents scale accordingly. All DC and AC parameters in the DS21832H datasheet are guaranteed across this full range, making 25AA010AT-I/MNY suitable for battery-powered or energy-harvesting systems where supply voltage may dip below 2.5 V.

How does the HOLD pin function during an active SPI transaction with the 25AA010AT-I/MNY?

The HOLD pin on the 25AA010AT-I/MNY suspends serial communication mid-transaction when pulled low while SCK is low. SI, SCK, and SO enter high-impedance states, and the device retains its internal address and instruction state. Upon returning HOLD to high (while SCK remains low), transmission resumes exactly where it paused - no reinitialization or retransmission is needed. This enables deterministic interruption handling in real-time microcontroller applications.

Can the 25AA010AT-I/MNY be used in systems requiring write protection independent of firmware control?

Yes. The 25AA010AT-I/MNY provides dual-layer write protection: hardware-based via the WP pin (low = all writes disabled regardless of STATUS register state) and software-configurable via BP0/BP1 bits in the STATUS register. When WP is tied low, it overrides all software write enables - ensuring critical configuration blocks remain immutable even if firmware is compromised or misconfigured.

What is the maximum number of bytes that can be written in a single page write operation for the 25AA010AT-I/MNY?

The 25AA010AT-I/MNY supports up to 16 bytes per page write operation. Physical pages are aligned to 16-byte boundaries (e.g., 00h–0Fh, 10h–1Fh). Attempting to write across a page boundary causes wraparound within the current page rather than spanning pages. Firmware must validate address alignment before initiating multi-byte writes to prevent unintended data overwrite in the 25AA010AT-I/MNY.

Does the 25AA010AT-I/MNY require external components for stable SPI communication?

No external passive components are required for basic SPI operation of the 25AA010AT-I/MNY. Pull-up resistors on SO are unnecessary due to its tri-state output driver. However, for noise immunity in electrically noisy environments (e.g., motor drives), a 100 Ω series resistor on SCK and SI lines near the 25AA010AT-I/MNY is recommended. WP and HOLD should be pulled high via ≥10 kΩ resistors if not actively driven by the host MCU.