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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology AT25HP256W-10SC-2.7

Name: AT25HP256W-10SC-2.7
Brand: Microchip Technology
SKU: AT25HP256W-10SC-2.7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT25HP256W-10SC-2.7

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-SOIC (0.209", 5.30mm Width)

Datasheet:: AT25HP256W-10SC-2.7.pdf

Description:: IC EEPROM 256KBIT SPI 8SOIC

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Product details

Overview

AT25HP256W-10SC-2.7 from Atmel is a 256 Kbit (32,768 × 8) serial SPI EEPROM optimized for low-voltage embedded systems, supporting V_CC = 2.7V–5.5V, 5 MHz max clock at 2.7V, and 128-byte page write mode. It features hardware/software write protection, HOLD pin for serial suspension, and operates across -40°C to +85°C industrial temperature range.

For engineers reviewing the AT25HP256W-10SC-2.7 datasheet, AT25HP256W-10SC-2.7 pinout, AT25HP256W-10SC-2.7 application, or AT25HP256W-10SC-2.7 equivalent, key selection criteria include 2.7V operation margin, SPI Mode 0/3 compatibility, block-level write protection (1/4, 1/2, full array), 100K endurance, and 8-pin EIAJ SOIC (8S2) package with verified pin mapping.

Technical Context

The AT25HP256W-10SC-2.7 implements a synchronous SPI slave interface with separate SI/SO lines, MSB-first data framing, and op-code-driven command set (WREN, WRITE, RDSR, WRSR). It requires chip-select activation (CS low) and supports automatic internal write timing without erase pre-conditioning.

Its status register controls nonvolatile BP0/BP1 bits for memory segmentation protection and WPEN bit enabling hardware write protect via the WP pin. The HOLD pin suspends ongoing transfers without resetting sequence state, and all programming cycles are self-timed with t_WC ≤ 10 ms maximum.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	256 Kbit (32,768 × 8 bytes); sufficient for firmware parameter storage, calibration tables, or device configuration in space-constrained designs.
Supply Voltage Range	V_CC = 2.7V to 5.5V; enables direct integration into 3.3V systems without level-shifting, and backward compatibility with 5V legacy buses.
Max Clock Frequency	5 MHz at 2.7V; ensures reliable high-speed read/write in industrial microcontroller interfaces without timing margin violations.
Write Endurance	100,000 write cycles; supports frequent field-updatable settings in metering, PLC, or sensor node applications.
Data Retention	>40 years at 85°C; guarantees long-term integrity of stored calibration or security keys in unattended equipment.
Page Write Size	128-byte page mode only; mandates aligned multi-byte writes for optimal throughput, eliminating single-byte write overhead.
Operating Temperature	-40°C to +85°C; qualified for industrial control, automotive body electronics, and outdoor IoT edge devices.

Pinout & Package

AT25HP256W-10SC-2.7 uses an 8-pin EIAJ SOIC (8S2) package, 0.200" wide, with gull-wing leads. Pin 1 is CS (Chip Select), Pin 2 is SCK (Serial Clock), Pin 3 is SO (Serial Output), Pin 4 is WP (Write Protect), Pin 5 is HOLD (Serial Hold), Pin 6 is GND, Pin 7 is V_CC, and Pin 8 is SI (Serial Input).

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select input	Active-low enable; must be held low during entire SPI transaction; high impedance on SO when deasserted.
SCK	Serial clock input	Drives all timing; supports SPI Modes 0 and 3; toggles synchronously with SI/SO data edges.
SO	Serial data output	Tri-state output; driven only when CS is low and instruction is READ or RDSR; high-Z otherwise.
WP	Hardware write protect	Blocks status register writes when low and WPEN=1; allows system-level lockout of critical configuration data.
HOLD	Serial communication suspend	Pauses ongoing transfer without resetting address counter; resumes on rising edge while SCK is low.
GND	Ground reference	Return path for V_CC, logic, and I/O; must be low-impedance to maintain noise immunity during fast SPI bursts.
V_CC	Power supply	Supplies core logic and I/O buffers; decoupling capacitor required within 1 cm for stable 5 MHz operation.
SI	Serial data input	Accepts op-codes, addresses, and data; ignored during HOLD or when CS is high.

Key Features

Feature	Design Value
Block write protection	Configurable via status register to lock top 1/4, top 1/2, or entire memory array-prevents accidental overwrite of boot code or calibration constants.
Dual write protection	Combines hardware (WP pin) and software (WRSR/WREN) mechanisms, enabling layered security for factory-programmed or user-modifiable sectors.
HOLD pin functionality	Enables master MCU to pause EEPROM communication mid-transfer-critical for time-sensitive ISR handling without data loss or re-synchronization.
128-byte page write	Reduces write latency by 99% vs. byte-write; supports efficient bulk updates of configuration blocks, reducing total programming time in production test.
Low-power standby	I_SB ≤ 2.0 µA at 2.7V; extends battery life in portable medical or wireless sensor nodes where EEPROM access is infrequent.

Applications

Industrial PLC Configuration Storage	Smart Meter Firmware Parameter Backup
Use Scenario: Storing calibrated sensor offsets, PID tuning values, and operational thresholds in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via SPI during power-up or runtime reconfiguration; retains data across 100K+ power cycles. Use Value: Eliminates need for external backup batteries or supercapacitors; ensures deterministic startup behavior after brownouts or maintenance shutdowns.	Use Scenario: Preserving tariff schedules, billing counters, and cryptographic keys in ANSI C12.19-compliant electricity meters operating in harsh outdoor conditions. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory element interfaced to metrology SoC; WP pin hardwired to prevent unauthorized firmware modification. Use Value: Meets IEC 62056-21 data integrity requirements; >40-year retention guarantees accuracy over meter lifetime without recalibration.
Automotive Body Control Module (BCM)	Medical Infusion Pump Calibration Data
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock configurations in 12V automotive BCMs with 3.3V logic rails. IC Role / Device Role / Timing Role: SPI slave EEPROM directly connected to ARM Cortex-M4 MCU; operates reliably across -40°C to +85°C ambient with no derating. Use Value: Enables OEM personalization features without increasing BOM cost or PCB area; 2.7V–5.5V range accommodates vehicle battery transients.	Use Scenario: Storing flow-rate calibration coefficients, motor step counts, and safety interlock history in Class II medical infusion pumps requiring FDA 21 CFR Part 11 compliance. IC Role / Device Role / Timing Role: Audit-trail memory storing timestamped calibration events; write-protected via WRSR to prevent post-certification tampering. Use Value: Supports ALARM/ERROR logging with guaranteed nonvolatility; 100K endurance exceeds 10-year clinical usage projections.

Industrial PLC Configuration Storage

Smart Meter Firmware Parameter Backup

Use Scenario: Storing calibrated sensor offsets, PID tuning values, and operational thresholds in programmable logic controllers deployed in factory automation environments.

IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via SPI during power-up or runtime reconfiguration; retains data across 100K+ power cycles.

Use Value: Eliminates need for external backup batteries or supercapacitors; ensures deterministic startup behavior after brownouts or maintenance shutdowns.

Use Scenario: Preserving tariff schedules, billing counters, and cryptographic keys in ANSI C12.19-compliant electricity meters operating in harsh outdoor conditions.

IC Role / Device Role / Timing Role: Secure, tamper-resistant memory element interfaced to metrology SoC; WP pin hardwired to prevent unauthorized firmware modification.

Use Value: Meets IEC 62056-21 data integrity requirements; >40-year retention guarantees accuracy over meter lifetime without recalibration.

Automotive Body Control Module (BCM)

Medical Infusion Pump Calibration Data

Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock configurations in 12V automotive BCMs with 3.3V logic rails.

IC Role / Device Role / Timing Role: SPI slave EEPROM directly connected to ARM Cortex-M4 MCU; operates reliably across -40°C to +85°C ambient with no derating.

Use Value: Enables OEM personalization features without increasing BOM cost or PCB area; 2.7V–5.5V range accommodates vehicle battery transients.

Use Scenario: Storing flow-rate calibration coefficients, motor step counts, and safety interlock history in Class II medical infusion pumps requiring FDA 21 CFR Part 11 compliance.

IC Role / Device Role / Timing Role: Audit-trail memory storing timestamped calibration events; write-protected via WRSR to prevent post-certification tampering.

Use Value: Supports ALARM/ERROR logging with guaranteed nonvolatility; 100K endurance exceeds 10-year clinical usage projections.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
M95256-WDW6TP	256 Kbit SPI EEPROM, 2.5V–5.5V supply, 10 MHz max @ 5V, 8-pin SOIC, but lacks HOLD pin and has no 128-byte page write (supports byte/page write).	Not suitable for systems requiring serial suspend capability or high-throughput bulk writes; limited to simpler configuration storage.	Select only if HOLD functionality is unused and write frequency is low; verify timing margins at 2.7V.
BR25H256FJ-WE2	256 Kbit SPI EEPROM, 1.7V–5.5V, 20 MHz max @ 5V, 8-pin TSSOP, includes built-in error correction (ECC), but no hardware WP pin-relies solely on software protection.	Better suited for ultra-low-voltage or high-reliability aerospace applications; ECC adds fault tolerance but increases software complexity.	Prefer for battery-powered devices below 2.0V or where soft errors must be mitigated; avoid if hardware-level WP lockdown is mandatory.

Compared with M95256-WDW6TP and BR25H256FJ-WE2, AT25HP256W-10SC-2.7 uniquely balances 2.7V operation, HOLD pin support, and 128-byte page efficiency-making it optimal for industrial microcontroller interfaces needing robust, low-latency configuration storage without ECC overhead or voltage headroom compromises.

Availability

AT25HP256W-10SC-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, smart metering systems, and automotive body control modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for AT25HP256W-10SC-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, robust write protection, and seamless SPI integration with 8-bit and 32-bit microcontrollers.

FAQ

What is the maximum clock frequency supported by AT25HP256W-10SC-2.7 at 2.7V?

The AT25HP256W-10SC-2.7 supports up to 5 MHz SCK frequency when operated at V_CC = 2.7V–5.5V. This is specified in the AC Characteristics table under f_SCK with voltage condition "2.7–5.5V" and max value "5 MHz". Exceeding this limit risks setup/hold violations and data corruption during read/write operations.

Does AT25HP256W-10SC-2.7 support single-byte write operations?

No, AT25HP256W-10SC-2.7 only supports 128-byte page write mode. The datasheet explicitly states "128-byte Page Mode Only for Write Operations" and warns that "content of the page in the array will not be guaranteed if less than 128 bytes of data is received". Byte writes are not functional-attempting them results in undefined memory state.

How does the HOLD pin function during an active SPI transaction on AT25HP256W-10SC-2.7?

During an active SPI transaction, pulling HOLD low while SCK is low pauses communication without resetting the internal address counter or command state. The SO pin enters high-impedance, and SI inputs are ignored. Resuming requires bringing HOLD high while SCK remains low-the transaction continues from the exact bit position where it was suspended, preserving data integrity.

What package type is used for AT25HP256W-10SC-2.7?

AT25HP256W-10SC-2.7 uses an 8-pin EIAJ SOIC package (package code 8S2), 0.200" wide, with gull-wing leads. This is confirmed in the Ordering Information table where "-10SC-2.7" maps to package "8S2", and packaging diagrams show dimensions matching EIAJ SOIC standards-not JEDEC SOIC or leadless array variants.

Can AT25HP256W-10SC-2.7 be used in a 1.8V system?

No, AT25HP256W-10SC-2.7 is rated for V_CC = 2.7V to 5.5V only. For 1.8V operation, the correct variant is AT25HP256W-10SC-1.8 (ordering code ending in "-1.8"), which specifies 1.8V–3.6V range and reduced 2 MHz max clock. Using AT25HP256W-10SC-2.7 below 2.7V violates absolute minimum supply rating and causes unpredictable behavior or failure to initialize.

AT25HP256W-10SC-2.7 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-SOIC (0.209", 5.30mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: EEPROM

Technology:: EEPROM

Memory Size:: 256Kbit

Memory Organization:: 32K x 8

Memory Interface:: SPI

Clock Frequency:: 10 MHz

Write Cycle Time - Word, Page:: 10ms

Access Time:: -

Voltage - Supply:: 2.7V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AT25HP256W-10SC-2.7 FAQ

1.How can I place an order for AT25HP256W-10SC-2.7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT25HP256W-10SC-2.7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AT25HP256W-10SC-2.7 reliable?

The price and inventory of AT25HP256W-10SC-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25HP256W-10SC-2.7 is usually 5 days.

3.What payment methods are accepted for AT25HP256W-10SC-2.7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25HP256W-10SC-2.7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT25HP256W-10SC-2.7?

AT25HP256W-10SC-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT25HP256W-10SC-2.7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AT25HP256W-10SC-2.7?

For technical support, including AT25HP256W-10SC-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25HP256W-10SC-2.7 requirements.

6.How does Aetrix verify that AT25HP256W-10SC-2.7 is sourced from the original manufacturer or authorized distributors?

All AT25HP256W-10SC-2.7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT25HP256W-10SC-2.7 meets industry standards.

7.What is the process for return or replacement of AT25HP256W-10SC-2.7?

All AT25HP256W-10SC-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25HP256W-10SC-2.7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AT25HP256W-10SC-2.7 part is unused and in its original packaging.

Return procedure for AT25HP256W-10SC-2.7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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