Microchip Technology AT25128A-10PI-2.7

Overview

AT25128A-10PI-2.7 from Microchip Technology (formerly Atmel) is a 128 Kbit SPI serial EEPROM organized as 16,384 × 8 bits, operating from 2.7V to 5.5V, featuring 20 MHz max clock rate at 5V, 64-byte page write capability, and hardware/software write protection via WP and HOLD pins. It serves as nonvolatile configuration storage in industrial control modules requiring reliable low-voltage data retention.

For engineers reviewing the AT25128A-10PI-2.7 datasheet, AT25128A-10PI-2.7 pinout, AT25128A-10PI-2.7 application, or AT25128A-10PI-2.7 equivalent, key selection criteria include VCC range compatibility (2.7–5.5 V), SOIC-8 package footprint, SPI Mode 0/3 timing compliance, and block write protection granularity (1/4, 1/2, or full array).

Technical Context

The AT25128A-10PI-2.7 implements a synchronous SPI slave interface with dedicated SI (input), SO (output), SCK (clock), and CS (chip select) lines, supporting MSB-first transmission and op-code–driven command execution (e.g., READ, WRITE, WRSR). Its internal architecture includes an 8-bit instruction register and nonvolatile status register with BP0/BP1 bits controlling memory segment protection.

Write operations require explicit WREN instruction prior to WRITE or WRSR; self-timed internal write cycles complete in ≤5 ms, during which only RDSR is accepted. The HOLD pin suspends ongoing serial transfers without resetting sequence state, while WP enables hardware lock of status register and protected memory blocks when WPEN = 1.

Key Specifications

Pinout & Package

AT25128A-10PI-2.7 uses an 8-lead JEDEC SOIC (8S1) package, 0.150" wide body, with standard gull-wing leads and 1.27 mm pitch. Pin 1 is marked by a notch or dot; device orientation follows JEDEC MO-001AA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95128-WMN6TP and 25LC128-I/P, AT25128A-10PI-2.7 uniquely provides HOLD functionality for robust multi-master SPI arbitration and is qualified across the full industrial temperature range with documented block protection granularity - critical for safety-critical configuration storage.

Availability

AT25128A-10PI-2.7 is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive body electronics requiring stable component supply, long-life data integrity, and JEDEC SOIC-8 footprint compatibility.

Supply support for AT25128A-10PI-2.7 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 acquired Atmel in 2016 and maintains full support for the AT25xxx EEPROM family, delivering high-reliability nonvolatile memory solutions with industry-leading endurance and retention specs.

The AT25128A-10PI-2.7 belongs to Microchip's SPI Serial EEPROM product line, designed specifically for embedded systems needing compact, low-power, pin-efficient nonvolatile storage with robust hardware and software write protection.

FAQ

What is the maximum clock frequency supported by AT25128A-10PI-2.7?

The AT25128A-10PI-2.7 supports up to 20 MHz SCK frequency at VCC = 5.0 V. At 2.7 V, the maximum rated clock frequency is 10 MHz per AC characteristics table. Exceeding these limits may cause read/write failures or timing violations in SPI transactions involving the AT25128A-10PI-2.7.

Does AT25128A-10PI-2.7 support both SPI Mode 0 and Mode 3?

Yes, AT25128A-10PI-2.7 explicitly supports SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as confirmed in its Features section. This dual-mode capability allows seamless integration with diverse microcontrollers - including legacy 8051 derivatives and modern ARM Cortex-M devices - without requiring mode translation logic for the AT25128A-10PI-2.7.

How does the HOLD pin function on AT25128A-10PI-2.7?

The HOLD pin on AT25128A-10PI-2.7 suspends ongoing SPI communication without resetting the internal address counter or command state. To activate, HOLD must be driven low while SCK is low; resuming requires HOLD high while SCK remains low. During HOLD, SI is ignored and SO enters high-impedance - preserving bus integrity for the AT25128A-10PI-2.7 in multi-peripheral systems.

What memory protection options are available on AT25128A-10PI-2.7?

AT25128A-10PI-2.7 offers three levels of block write protection (none, top 1/4, top 1/2, or full array) controlled by BP0/BP1 bits in the status register, plus hardware write protection via the WP pin when WPEN = 1. Protection is nonvolatile and persists across power cycles, ensuring configuration data integrity for the AT25128A-10PI-2.7 in unattended deployments.

Is AT25128A-10PI-2.7 RoHS compliant and lead-free?

Yes, AT25128A-10PI-2.7 is lead-free and RoHS compliant, as indicated by the "-2.7" suffix and packaging documentation specifying halogen-free materials. The SOIC-8 (8S1) package meets JEDEC standards and carries full environmental compliance certification - essential for global electronics manufacturing using the AT25128A-10PI-2.7.