Microchip Technology AT25HP512-10CI-1.8

Overview

AT25HP512-10CI-1.8 from Microchip Technology (formerly Atmel) is a 512 Kbit (65,536 × 8) SPI serial EEPROM optimized for low-voltage embedded systems. It operates from 1.8 V to 5.5 V, supports 2 MHz clock rate at 1.8 V, features 128-byte page write mode, 100K endurance cycles, and >40-year data retention - deployed in industrial sensor nodes and portable medical devices requiring nonvolatile configuration storage.

For engineers reviewing the AT25HP512-10CI-1.8 datasheet, AT25HP512-10CI-1.8 pinout, AT25HP512-10CI-1.8 application, or AT25HP512-10CI-1.8 equivalent, key selection criteria include 1.8 V operation margin, block write protection granularity (1/4, 1/2, or full array), HOLD/ WP pin behavior under low-VCC conditions, and compatibility with SPI Mode 0/3 microcontrollers in space-constrained designs.

Technical Context

The AT25HP512-10CI-1.8 implements a synchronous SPI slave interface with separate SI/SO lines, MSB-first data framing, and no erase cycle required before write. Its status register (WPEN, BP1/BP0, WEN, RDY) controls hardware/software write protection and readiness monitoring.

Internal self-timed write cycles (max 10 ms) eliminate external timing management; HOLD pin suspends ongoing transfers without resetting sequence state; WP pin enables hardware lock of status register when WPEN = 1. The device supports SPI Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1), ensuring interoperability with diverse host controllers.

Key Specifications

Pinout & Package

AT25HP512-10CI-1.8 is housed in an 8-lead Leadless Array Package (LAP), 6.0 mm × 5.0 mm × 1.04 mm body, 1.27 mm pitch, with exposed pad not electrically connected. Pin 1 is marked at top-left corner (viewed from top).

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95512-DFMN6TP and BR24G512FJ-WE2, AT25HP512-10CI-1.8 delivers superior low-voltage timing (2 MHz at 1.8 V), hardware HOLD suspension, and configurable block protection - making it optimal for real-time embedded systems demanding deterministic SPI response and robust data integrity.

Availability

AT25HP512-10CI-1.8 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical devices, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AT25HP512-10CI-1.8 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 technical and manufacturing continuity for the AT25HP family. The company specializes in scalable microcontrollers, analog, and memory solutions for industrial, automotive, and IoT markets.

AT25HP512-10CI-1.8 belongs to Microchip's legacy SPI EEPROM product line, engineered for ultra-low-voltage operation and high reliability in harsh environments - targeting applications where data integrity, long-term retention, and minimal power consumption are critical.

FAQ

What is the minimum supply voltage required for reliable operation of the AT25HP512-10CI-1.8?

The AT25HP512-10CI-1.8 is fully specified for operation from 1.8 V to 5.5 V. At 1.8 V, it guarantees 2 MHz SPI clock rate, valid DC/AC timing, and full functionality including WRITE, READ, and status register access. Operation below 1.8 V is not characterized and may result in data corruption or communication failure.

Does the AT25HP512-10CI-1.8 support byte-level writes, or is page write mandatory?

The AT25HP512-10CI-1.8 supports only 128-byte page writes - byte-level writes are not supported. Attempting to write fewer than 128 bytes within a page leaves remaining bytes in undefined state. Full 128-byte alignment is required for predictable data integrity; partial-page writes must be avoided in firmware design.

How does the HOLD pin function during an active SPI transaction on the AT25HP512-10CI-1.8?

When HOLD is asserted low during an active SPI transaction (with CS low and SCK low), the AT25HP512-10CI-1.8 immediately suspends data shifting while preserving internal address counter and instruction state. Communication resumes upon HOLD returning high while SCK remains low - no re-initialization or address reset is needed.

Can the AT25HP512-10CI-1.8 be used interchangeably with the AT25HP512-10CI-2.7 in the same PCB layout?

No - although both share the same 8-lead LAP (8CN3) package, the AT25HP512-10CI-1.8 is characterized for 1.8–5.5 V operation with timing specs valid down to 1.8 V, whereas the -2.7 variant is optimized for 2.7–5.5 V. Using the -1.8 version at 2.7 V is safe, but substituting the -2.7 version at 1.8 V violates specifications and risks functional failure.

What happens to the status register's WPEN bit if the WP pin is held low continuously on the AT25HP512-10CI-1.8?

If WP is held low and WPEN = 1, the status register becomes permanently write-protected - including the WPEN bit itself. Once locked, WPEN cannot be cleared to "0" while WP remains low. To re-enable status register writes, WP must first be raised high, then WRDI followed by WRSR must be issued to reset WPEN.