Microchip Technology 25AA010AT-I/MS

Overview

25AA010AT-I/MS 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, and industrial temperature rating (–40°C to +85°C). It features hardware write protection (WP pin), HOLD functionality for interrupt-safe serial communication, and 16-byte page write capability. Used for nonvolatile parameter storage in microcontroller-based embedded systems requiring low-power, reliable data retention.

For engineers reviewing the 25AA010AT-I/MS datasheet, 25AA010AT-I/MS pinout, 25AA010AT-I/MS application, or 25AA010AT-I/MS equivalent, key selection criteria include VCC operating range compatibility, SPI timing margins at target clock speed, WP/HOLD pin integration requirements, endurance (1M cycles), and MSOP-8 package footprint constraints.

Technical Context

The 25AA010AT-I/MS 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. Its internal architecture includes an 8-bit instruction register, page latches, and high-voltage generation circuitry for EEPROM programming.

Write operations require explicit WREN instruction followed by CS high-to-low transition to initiate self-timed internal write cycle (≤5 ms). Block protection is configurable via STATUS register (BP0/BP1 bits) to lock 0%, 25%, 50%, or 100% of memory array, while WP pin provides hardware-level write disable independent of latch state.

Key Specifications

Pinout & Package

8-lead MSOP package (3.0 mm × 4.9 mm body, 0.65 mm lead pitch), RoHS-compliant, Pb-free matte tin finish. Pin 1 marked by laser indentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA010AT-I/MS, the 25AA010A-I/SN offers identical functionality in a larger, more manufacturable package, while the AT25010B-MAHL-T sacrifices 1.8 V operation and HOLD capability - making the 25AA010AT-I/MS optimal for compact, low-voltage, interrupt-sensitive embedded systems.

Availability

25AA010AT-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for 25AA010AT-I/MS 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 25AA010A family was designed specifically for cost-sensitive, space-constrained embedded systems needing reliable, low-voltage serial EEPROM with robust write protection and interrupt-aware communication - targeting industrial, medical, and automotive applications.

FAQ

What is the maximum clock frequency supported by the 25AA010AT-I/MS?

The 25AA010AT-I/MS supports up to 10 MHz clock frequency when VCC is 4.5 V to 5.5 V. At 2.5 V ≤ VCC < 4.5 V, maximum frequency drops to 5 MHz, and at 1.8 V ≤ VCC < 2.5 V, it is limited to 3 MHz. These limits ensure reliable setup/hold timing across voltage and temperature ranges - always verify against AC Characteristics Table 1-2 in DS21832H for your specific VCC condition.

Does the 25AA010AT-I/MS support 1.8 V operation?

Yes, the 25AA010AT-I/MS is fully specified for 1.8–5.5 V operation, unlike the 25LC010A variant which requires minimum 2.5 V. This makes the 25AA010AT-I/MS suitable for direct interfacing with 1.8 V microcontrollers and low-power battery-operated systems without level-shifting circuitry.

How does the HOLD pin function in the 25AA010AT-I/MS?

The HOLD pin on the 25AA010AT-I/MS suspends ongoing SPI communication without resetting the internal state. When pulled low while SCK is low, SI/SO/SCK inputs are ignored and SO enters high-impedance. The host MCU can then service interrupts and resume the exact same transaction by driving HOLD high - eliminating need for command retransmission and ensuring deterministic timing.

What write protection mechanisms does the 25AA010AT-I/MS provide?

The 25AA010AT-I/MS provides dual-layer write protection: (1) hardware via the WP pin (low = unconditional write disable), and (2) software-configurable block protection via BP0/BP1 bits in the STATUS register (0–100% array lock). Both operate independently - WP overrides WEL state, while BP bits allow granular control over which memory segments remain writable.

Is the 25AA010AT-I/MS pin-compatible with other Microchip 1 Kbit SPI EEPROMs?

Yes, the 25AA010AT-I/MS shares identical pinout and function mapping with all 25XX010A family members in MSOP-8 (e.g., 25LC010AT-I/MS), including CS, SO, WP, VSS, SI, SCK, HOLD, and VCC assignments. This enables direct substitution within the same package footprint when voltage or temperature requirements align.