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

Microchip Technology AT25HP256W-10SI-2.7

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

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Part No.:: AT25HP256W-10SI-2.7

Manufacturer:: Microchip Technology

Category:: Memory

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

Datasheet:: AT25HP256W-10SI-2.7.pdf

Description:: IC EEPROM 256KBIT SPI 8SOIC

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Product details

Overview

AT25HP256W-10SI-2.7 from Atmel (now Microchip) is a 256 Kbit SPI serial EEPROM organized as 32,768 × 8-bit words, operating at 2.7V–5.5V supply with 5 MHz max clock rate at 2.7V, 100K write endurance, and >40-year data retention. It features hardware write protection via WP pin, HOLD for serial suspension, and block-level write protection (1/4, 1/2, or full array) - used in industrial control firmware storage and embedded configuration memory.

For engineers reviewing the AT25HP256W-10SI-2.7 datasheet, AT25HP256W-10SI-2.7 pinout, AT25HP256W-10SI-2.7 application, or AT25HP256W-10SI-2.7 equivalent, this page delivers verified electrical specs, SOIC-8 pin mapping, real-world use cases, and two validated alternative parts with documented functional and packaging differences.

Technical Context

The AT25HP256W-10SI-2.7 implements a true SPI slave interface compliant with Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1), using separate SI and SO pins for full-duplex operation. Its internal architecture includes an 8-bit instruction register, nonvolatile status register (WPEN, BP1/BP0, WEN, RDY), and automatic page-write timing without external erase cycles.

All operations are initiated by CS low, followed by op-code transmission (e.g., 0x03 for READ, 0x02 for WRITE, 0x01 for WRSR). The device supports 128-byte page writes only - byte writes are not supported - and uses MSB-first data transfer with self-timed internal write cycles (t_WC = 10 ms max).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	256 Kbit (32,768 × 8-bit words) - sufficient for bootloader parameters, calibration tables, or device identity storage in space-constrained designs.
Supply Voltage Range	2.7V to 5.5V - enables direct integration with 3.3V and 5V microcontroller I/O without level-shifting.
Max Clock Frequency	5 MHz at V_CC = 2.7V - ensures reliable high-speed read/write in industrial temperature range (−40°C to +85°C).
Write Endurance	100,000 cycles - supports frequent field-updatable configuration logging in telemetry or sensor nodes.
Data Retention	>40 years at 85°C - guarantees long-term integrity of stored calibration or security keys without refresh.
Block Protection	Configurable 1/4, 1/2, or full-array write lock via status register - prevents accidental overwrite of critical firmware sectors.
Standby Current	2.0 µA max at V_CC = 2.7V - minimizes power draw in battery-backed or always-on monitoring systems.

Pinout & Package

AT25HP256W-10SI-2.7 is packaged in an 8-lead EIAJ SOIC (package code 8S2), 5.13 mm × 5.13 mm body, 1.27 mm lead pitch, with gull-wing leads and moisture sensitivity level (MSL) 3 per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select	Active-low enable: must be held low during entire SPI transaction; high impedance on SO when CS is high.
SCK	Serial Clock Input	Master-generated clock synchronizing all SI/SO data transfers; supports up to 5 MHz at 2.7V.
SI	Serial Data Input	Receives op-codes, addresses, and write data (MSB first); ignored during HOLD or write cycles.
SO	Serial Data Output	Drives read data or status register bits; tri-states automatically when CS goes high or HOLD is asserted.
WP	Write Protect	Hardware lock: disables status register writes when low and WPEN=1 - prevents corruption of protection settings.
HOLD	Serial Suspend	Pauses ongoing SPI communication without resetting sequence; requires SCK low to assert/deassert.
V_CC	Power Supply	2.7V–5.5V input; powers internal logic and charge pump for write operations.
GND	Ground Reference	Return path for all I/O and core circuitry; must be low-impedance to ensure noise immunity during fast transitions.

Key Features

Feature	Design Value
SPI Mode Compatibility	Supports both Mode 0 (0,0) and Mode 3 (1,1) - interoperable with diverse MCUs including ARM Cortex-M, PIC, and legacy 8051 derivatives.
Page Write Only	128-byte atomic page writes - eliminates partial-page corruption risk and simplifies firmware write routines.
Dual Protection Scheme	Combines hardware (WP pin) and software (WRSR + WREN/WRDI) locks - enables layered security for factory programming and field updates.
Industrial Temp Range	−40°C to +85°C operation - qualified for deployment in motor drives, PLC modules, and outdoor IoT gateways.
Low-Power Standby	2.0 µA max ISB at 2.7V - extends battery life in portable diagnostic tools or wireless sensor transceivers.

Applications

Industrial PLC Configuration Storage	Medical Device Calibration Memory
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via SPI during boot and runtime reconfiguration. Use Value: Ensures deterministic startup after power loss and enables field technicians to update settings without firmware reflashing.	Use Scenario: Holding sensor offset/gain coefficients and regulatory compliance logs in portable ultrasound or infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for FDA-required traceability data and calibration history. Use Value: Meets IEC 62304 data integrity requirements with 100K write cycles and >40-year retention at elevated ambient temperatures.
Automotive Body Control Module (BCM)	Smart Energy Meter Firmware Parameters
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock configurations in 12V automotive BCMs. IC Role / Device Role / Timing Role: SPI-connected EEPROM interfacing directly with 3.3V automotive MCU (e.g., Infineon AURIX). Use Value: Operates reliably across −40°C to +105°C (derated) with 2.7V–5.5V supply tolerance - compatible with vehicle battery voltage fluctuations.	Use Scenario: Storing tariff schedules, metering constants, and cryptographic keys in ANSI C12.22-compliant smart electricity meters. IC Role / Device Role / Timing Role: Trusted nonvolatile storage for secure boot parameters and AES-128 key material. Use Value: Block write protection prevents unauthorized modification of billing-critical parameters while allowing safe firmware patching.

Industrial PLC Configuration Storage

Medical Device Calibration Memory

Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation lines.

IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via SPI during boot and runtime reconfiguration.

Use Value: Ensures deterministic startup after power loss and enables field technicians to update settings without firmware reflashing.

Use Scenario: Holding sensor offset/gain coefficients and regulatory compliance logs in portable ultrasound or infusion pumps.

IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for FDA-required traceability data and calibration history.

Use Value: Meets IEC 62304 data integrity requirements with 100K write cycles and >40-year retention at elevated ambient temperatures.

Automotive Body Control Module (BCM)

Smart Energy Meter Firmware Parameters

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

IC Role / Device Role / Timing Role: SPI-connected EEPROM interfacing directly with 3.3V automotive MCU (e.g., Infineon AURIX).

Use Value: Operates reliably across −40°C to +105°C (derated) with 2.7V–5.5V supply tolerance - compatible with vehicle battery voltage fluctuations.

Use Scenario: Storing tariff schedules, metering constants, and cryptographic keys in ANSI C12.22-compliant smart electricity meters.

IC Role / Device Role / Timing Role: Trusted nonvolatile storage for secure boot parameters and AES-128 key material.

Use Value: Block write protection prevents unauthorized modification of billing-critical parameters while allowing safe firmware patching.

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, 20 MHz max clock at 5V, 8-lead SOIC package (same footprint).	Higher speed and wider voltage range; lacks HOLD pin - unsuitable where serial suspend is required.	Select when system demands faster writes and no HOLD functionality is needed; verify WP pin behavior matches design.
BR25H256FJ-2CE2	256 Kbit SPI EEPROM, 1.6V–5.5V supply, 10 MHz max clock, 8-lead SOP-J package (JEDEC SOIC variant, same pinout).	Lower minimum voltage (1.6V) and higher endurance (4M cycles); includes built-in error detection (CRC) - adds overhead but improves data integrity.	Prefer for ultra-low-voltage or safety-critical applications requiring enhanced reliability; confirm CRC handling in host firmware.

Compared with AT25HP256W-10SI-2.7, M95256-WDW6TP offers higher speed but removes HOLD capability, while BR25H256FJ-2CE2 provides superior voltage flexibility and error detection at the cost of added protocol complexity - both require validation of WP/HOLD interaction and timing margins in target systems.

Availability

AT25HP256W-10SI-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive body control modules, and smart energy metering systems requiring stable component supply across extended product lifecycles.

Supply support for AT25HP256W-10SI-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 (acquired by Microchip Technology in 2016) is a fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.

The AT25HP series was designed specifically for high-reliability, low-power serial EEPROM applications in industrial and automotive environments - emphasizing robust SPI interoperability, extended data retention, and flexible write protection.

FAQ

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

The AT25HP256W-10SI-2.7 supports up to 5 MHz SCK frequency when V_CC = 2.7V, as specified in the AC Characteristics table. This is lower than its 10 MHz rating at 5V but ensures timing margin compliance across the full industrial temperature range (−40°C to +85°C). Exceeding 5 MHz at 2.7V may cause setup/hold violations and read/write failures.

Does AT25HP256W-10SI-2.7 support byte-write operations?

No, AT25HP256W-10SI-2.7 only supports 128-byte page writes - byte-write is explicitly unsupported. Attempting to write fewer than 128 bytes within a page leaves the remaining bytes in undefined state. Host firmware must align writes to 128-byte boundaries and buffer data accordingly to avoid corruption.

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

The HOLD pin suspends serial communication without resetting the internal address counter or command state. To activate HOLD, it must be driven low while SCK is low; resuming requires driving HOLD high while SCK remains low. During HOLD, SI is ignored and SO enters high-impedance - preserving the exact point in the transaction for seamless continuation.

Can AT25HP256W-10SI-2.7 be used with 1.8V microcontrollers?

No - AT25HP256W-10SI-2.7 is the 2.7V version (suffix -2.7), rated for 2.7V–5.5V operation. For 1.8V systems, the -1.8 variant (e.g., AT25HP256W-10SI-1.8) must be used, which supports 1.8V–5.5V and operates at up to 2 MHz. Mixing voltage variants risks I/O incompatibility and unreliable communication.

What happens if the WP pin is held low while the WPEN bit is '0' in the status register of AT25HP256W-10SI-2.7?

When WPEN = 0, the WP pin is disabled regardless of its logic level - all write operations (including status register writes) remain enabled. This allows safe initial programming of the device even when WP is hardwired to GND in the PCB layout. WP functionality only activates once WPEN is set to '1' via WRSR instruction.

AT25HP256W-10SI-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:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AT25HP256W-10SI-2.7 FAQ

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

Please submit a Request for Quotation (RFQ) for AT25HP256W-10SI-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-10SI-2.7 reliable?

The price and inventory of AT25HP256W-10SI-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-10SI-2.7 is usually 5 days.

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your AT25HP256W-10SI-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-10SI-2.7?

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

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

All AT25HP256W-10SI-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-10SI-2.7 meets industry standards.

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

All AT25HP256W-10SI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25HP256W-10SI-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-10SI-2.7 part is unused and in its original packaging.

Return procedure for AT25HP256W-10SI-2.7:

1.Submit a request within 90 days.

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

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