Microchip Technology AT25HP512-10PC-2.7

Overview

AT25HP512-10PC-2.7 from Atmel is a 512 Kbit (65,536 × 8) serial SPI EEPROM optimized for low-voltage industrial and embedded systems. It operates across 2.7V–5.5V, supports 5 MHz SPI clock at 2.7V, features 128-byte page write, block write protection (1/4, 1/2, or full array), and offers 100K endurance with >40-year data retention.

For engineers reviewing the AT25HP512-10PC-2.7 datasheet, AT25HP512-10PC-2.7 pinout, AT25HP512-10PC-2.7 application, or AT25HP512-10PC-2.7 equivalent, key selection criteria include its 2.7V–5.5V supply range, 8-pin PDIP package, hardware/software write protection via WP/HOLD pins, and compatibility with SPI Modes 0 and 3 in space-constrained industrial control and automotive subsystems.

Technical Context

The AT25HP512-10PC-2.7 functions as an SPI slave device with separate SI/SO lines, MSB-first data transfer, and no external erase cycle required. Its instruction set includes WREN/WRDI for write enable/disable, RDSR/WRSR for status register access, and READ/WRITE with automatic address incrementing during page operations.

Block write protection is implemented via nonvolatile BP0/BP1 bits in the status register, enabling selective locking of top 1/4 (0x6000–0x7FFF), top 1/2 (0x4000–0x7FFF), or entire memory array (0x0000–0x7FFF). The WP pin-when enabled by WPEN bit-blocks status register writes and protected memory writes, while HOLD suspends ongoing serial communication without resetting the sequence.

Key Specifications

Pinout & Package

AT25HP512-10PC-2.7 uses an 8-pin Plastic Dual In-line Package (PDIP), 0.300" wide, with standard through-hole footprint and 0.100" pin pitch. Pin 1 is marked with a notch or dot; orientation follows JEDEC MS-001 BA standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95512-DRMN6TP/K and 25AA512-I/P, the AT25HP512-10PC-2.7 uniquely combines industrial-grade 100K endurance, guaranteed >40-year retention, HOLD pin support, and explicit 2.7V–5.5V operation-making it optimal for safety-critical or long-lifecycle embedded systems requiring robust, drop-in SPI EEPROM functionality.

Availability

AT25HP512-10PC-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and medical infusion pump settings requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production batches.

Supply support for AT25HP512-10PC-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) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer markets.

The AT25HP series was designed specifically for high-reliability serial EEPROM applications demanding low-voltage operation, fast SPI throughput, and robust data integrity-targeting embedded systems where firmware configurability and field-upgradability are essential.

FAQ

What voltage range does the AT25HP512-10PC-2.7 support, and how does it affect SPI speed?

The AT25HP512-10PC-2.7 supports 2.7V to 5.5V operation. At 2.7V, maximum SPI clock frequency is 5 MHz; at 5.0V, it rises to 10 MHz. This voltage-dependent speed scaling allows designers to maintain timing margins in low-power modes while maximizing throughput during active programming-critical for bootloader efficiency in battery-powered AT25HP512-10PC-2.7 implementations.

Does the AT25HP512-10PC-2.7 require an external erase cycle before writing?

No, the AT25HP512-10PC-2.7 performs fully self-timed write cycles with no separate erase step. Each WRITE instruction automatically handles erase-and-program internally. This simplifies firmware design and eliminates erase-related timing uncertainty-enabling deterministic write latency of ≤10 ms per page in AT25HP512-10PC-2.7 applications.

How does the HOLD pin function during an active SPI transaction on the AT25HP512-10PC-2.7?

The HOLD pin pauses serial communication without resetting the internal state: it must be asserted low while SCK is low, and released while SCK remains low. During HOLD, SI inputs are ignored and SO enters high-impedance. This allows AT25HP512-10PC-2.7 to coexist with time-critical interrupts in MCU systems-resuming exactly where the transaction left off upon deassertion.

Can the AT25HP512-10PC-2.7 be used in place of the AT25HP512-10PC (5V version) without hardware changes?

Yes-the AT25HP512-10PC-2.7 shares identical pinout, timing, and instruction set with the 5V AT25HP512-10PC, but extends VCC down to 2.7V. No PCB changes are needed; however, ensure system VCC stays ≥2.7V and verify SPI master drive strength meets AT25HP512-10PC-2.7's VIH/VIL thresholds across temperature.

What protection mechanisms prevent unintended writes to the AT25HP512-10PC-2.7?

The AT25HP512-10PC-2.7 implements three layers: (1) Write Enable Latch (WREN required before any write), (2) Block Protection bits (BP0/BP1) locking memory segments, and (3) Hardware WP pin control enabled by WPEN bit. All must be satisfied for writes to succeed-ensuring AT25HP512-10PC-2.7 resists corruption from noise, firmware bugs, or power glitches.