Microchip Technology AT25HP512-10CI-2.7

Overview

AT25HP512-10CI-2.7 from Atmel (now Microchip) is a 512 Kbit SPI serial EEPROM organized as 65,536 × 8-bit words, operating from 2.7V to 5.5V with 5 MHz max clock rate at 2.7V, 100K write endurance, and >40-year data retention-used for firmware storage, calibration data, and configuration in industrial controllers and embedded systems.

For engineers reviewing the AT25HP512-10CI-2.7 datasheet, AT25HP512-10CI-2.7 pinout, AT25HP512-10CI-2.7 application, or AT25HP512-10CI-2.7 equivalent, key selection considerations include its 8-lead leadless array (LAP) package, hardware/software write protection via WP pin and status register, 128-byte page write mode, SPI Mode 0/3 compatibility, and industrial temperature range (–40°C to +85°C).

Technical Context

The AT25HP512-10CI-2.7 implements a synchronous SPI slave interface with separate SI/SO pins, MSB-first data transfer, and no erase cycle required before write. It uses an 8-bit instruction register with op-codes including WREN, WRITE, RDSR, and WRSR.

Its internal architecture supports block write protection (BP0/BP1 bits) for top 1/4, top 1/2, or full memory array, and integrates nonvolatile WPEN bit control for hardware write protect enable/disable. The HOLD pin suspends ongoing serial communication without resetting sequence state.

Key Specifications

Pinout & Package

AT25HP512-10CI-2.7 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 marked by corner cut.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25HP512-10CI-2.7, M95512-DRMN6TP/K offers higher speed at 5 V but lacks HOLD and requires SOIC layout change, while BR24G512FJ-WE2 supports wider voltage range and lower quiescent current but trades off speed and pin compatibility - making AT25HP512-10CI-2.7 optimal for industrial designs needing HOLD, LAP footprint, and guaranteed 5 MHz at 2.7 V.

Availability

AT25HP512-10CI-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, smart energy meters, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for AT25HP512-10CI-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

Atmel Corporation, now part of Microchip Technology, designs high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets.

The AT25HP series targets cost-sensitive, space-constrained embedded systems needing robust SPI EEPROM with hardware write protection and extended temperature operation - optimized for firmware and configuration storage where endurance and retention outweigh raw speed.

FAQ

What is the maximum clock frequency supported by AT25HP512-10CI-2.7 at 2.7 V?

The AT25HP512-10CI-2.7 supports up to 5 MHz SCK frequency when operated at 2.7 V, as specified in the AC Characteristics table under "fSCK" for 2.7–5.5 V supply range. This is lower than its 10 MHz rating at 4.5–5.5 V but ensures reliable timing margins across the full industrial temperature range (–40°C to +85°C). Exceeding 5 MHz at 2.7 V may cause setup/hold violations and data corruption.

Does AT25HP512-10CI-2.7 support single-byte write operations?

No, AT25HP512-10CI-2.7 does not support single-byte writes. It implements page write only, with a fixed 128-byte page size. Attempting to write fewer than 128 bytes within a page leaves remaining bytes undefined, and partial-page writes are not guaranteed. Host firmware must buffer and align writes to 128-byte boundaries and manage address rollover explicitly.

How is hardware write protection enabled on AT25HP512-10CI-2.7?

Hardware write protection on AT25HP512-10CI-2.7 is enabled by setting the WPEN bit (Bit 7) in the status register via WRSR instruction, then pulling the WP pin low. When WPEN = 1 and WP = low, all writes to the status register-including BP0/BP1 and WPEN itself-and to block-protected memory regions are inhibited. If WPEN = 0, the WP pin has no effect regardless of its logic level.

What package type is used for AT25HP512-10CI-2.7?

AT25HP512-10CI-2.7 uses the 8-lead leadless array package (LAP), designated as 8CN3: 6.0 mm × 5.0 mm × 1.04 mm body, 1.27 mm pitch, with pin 1 identified by a corner cut. This surface-mount package provides compact footprint and thermal performance suitable for dense industrial PCB layouts, differing from PDIP, SOIC, or JEDEC SOIC variants in the same family.

Can AT25HP512-10CI-2.7 operate down to 1.8 V?

No, AT25HP512-10CI-2.7 is specifically rated for 2.7 V to 5.5 V operation, indicated by the "-2.7" suffix. Devices supporting 1.8 V operation carry the "-1.8" suffix (e.g., AT25HP512-10CI-1.8). Using AT25HP512-10CI-2.7 below 2.7 V risks unreliable read/write behavior, increased error rates, and potential data corruption due to insufficient internal voltage margin for charge pump operation.