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Microchip Technology AT25256AW-10SU-2.7
- Part No.:
- AT25256AW-10SU-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25256AW-10SU-2.7.pdf
- Description:
- IC EEPROM 256KBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,901
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Product details
Overview
AT25256AW-10SU-2.7 from Microchip Technology (formerly Atmel) is a 256 Kbit SPI serial EEPROM organized as 32,768 × 8 bits, operating from 2.7V to 5.5V, supporting 20 MHz clock rate at 5V, with 64-byte page write and hardware/software write protection via WP and HOLD pins. It is used in industrial control systems for nonvolatile parameter storage requiring low-voltage operation and high reliability.
For engineers reviewing the AT25256AW-10SU-2.7 datasheet, AT25256AW-10SU-2.7 pinout, AT25256AW-10SU-2.7 application, or AT25256AW-10SU-2.7 equivalent, key selection criteria include VCC range (2.7–5.5 V), SPI Mode 0/3 compatibility, 1 million write endurance, >100-year data retention, and 8-lead SOIC package with lead-free/halogen-free compliance.
Technical Context
The AT25256AW-10SU-2.7 implements a synchronous serial peripheral interface (SPI) as a slave device with separate SI and SO lines, MSB-first data transfer, and op-code–driven command execution. It uses an 8-bit instruction register and supports WREN/WRDI/RDSR/WRSR/READ/WRITE instructions with status register bit-level control of block protection (BP0/BP1) and write enable (WEN).
Its internal architecture includes nonvolatile status register bits (WPEN, BP1, BP0, WEN, RDY) with identical endurance and retention as memory cells, enabling persistent configuration of 1/4, 1/2, or full-array write protection. The HOLD pin suspends ongoing serial communication without resetting the sequence, while WP provides hardware-level inhibition of status register writes when WPEN = 1 and WP = low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8), enabling storage of firmware calibration tables or device configuration profiles |
| Supply Voltage | 2.7 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers without level shifting |
| Max Clock Rate | 20 MHz at 5 V - enables fast bulk read/write operations for time-critical logging applications |
| Write Cycle Time | 5 ms max - defines minimum interval between successive page writes; impacts real-time data capture latency |
| Endurance | 1 million write cycles - ensures long-term reliability in field-updatable systems with frequent parameter changes |
| Data Retention | >100 years - guarantees integrity of stored settings across product lifetime without refresh |
| Operating Temp | −40°C to +85°C - qualified for industrial environments including factory automation and outdoor metering |
Pinout & Package
AT25256AW-10SU-2.7 is supplied in an 8-lead SOIC (EIAJ) package (package code "S2"), measuring 5.13–5.35 mm × 7.70–8.26 mm × 1.70–2.16 mm height, with gull-wing leads and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be low to accept commands; high impedance on SO when CS high |
| SCK | Serial Clock | Master-generated clock input; timing reference for SI/SO data sampling per SPI Mode 0/3 |
| SI | Serial Data Input | Command/op-code/address/data input path; ignored during HOLD or write cycle |
| SO | Serial Data Output | Read data output; tri-stated when CS high or during HOLD; valid within tV after SCK edge |
| GND | Ground Reference | Return path for VCC and all I/O signals; critical for noise immunity in mixed-signal PCB layouts |
| VCC | Power Supply | Single 2.7–5.5 V supply; powers internal logic, memory array, and I/O buffers |
| WP | Write Protect | Hardware lock for status register writes when WPEN = 1 and WP = low; prevents accidental reconfiguration |
| HOLD | Communication Suspend | Pauses active SPI transaction without resetting address counter; requires SCK low during assertion |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Enables interoperability with diverse microcontrollers (e.g., ARM Cortex-M, PIC, STM32) without protocol translation |
| 64-byte Page Write | Reduces write overhead by up to 64× vs. byte-write; improves efficiency in burst data logging scenarios |
| Block Write Protection | Configurable 1/4, 1/2, or full-array lock via status register - secures critical boot parameters or calibration data |
| Self-timed Write Cycle | Eliminates need for external timing control or polling delay; simplifies firmware implementation of write routines |
| Lead-free/Halogen-free | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning constants, and alarm thresholds in programmable logic controllers deployed in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed via SPI during power-up and runtime reconfiguration. Use Value: Ensures deterministic startup behavior and field-upgradable control logic without battery-backed SRAM. | Use Scenario: Retaining sensor offset/gain coefficients and regulatory compliance logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store interfaced to MCU during device initialization and periodic self-test. Use Value: Meets IEC 62304 software lifecycle requirements for medical data integrity and traceability. |
| Smart Energy Meter Firmware Settings | Automotive Body Control Module NVM |
Use Scenario: Holding tariff schedules, billing counters, and communication module credentials in ANSI C12.19-compliant electricity meters. IC Role / Device Role / Timing Role: SPI EEPROM providing authenticated, write-protected storage for revenue-critical operational parameters. Use Value: Prevents unauthorized modification via WP pin hardwiring and status register BP bits, satisfying ANSI C12.22 security mandates. | Use Scenario: Saving seat/mirror position presets, lighting profiles, and error codes in 12 V automotive body electronics. IC Role / Device Role / Timing Role: Low-voltage (2.7–5.5 V) serial NVM accessed during ignition-on initialization and runtime updates. Use Value: Operates reliably across cold-crank (6.5 V) to load-dump (18 V) transients when paired with appropriate LDO regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-DW | STMicroelectronics 256 Kbit SPI EEPROM; 2.5–5.5 V supply; 20 MHz max clock; same 8-lead SOIC package | Supports SPI Mode 0 only (not Mode 3); lacks HOLD pin; different status register bit layout | Preferred where HOLD functionality is unused and design already qualifies ST's M95xxx family |
| BR25H256FJ-2CE2 | Rohm 256 Kbit SPI EEPROM; 1.7–5.5 V supply; 10 MHz max clock; 8-pin TSSOP (JEDEC MO-153) | Lower max clock rate; different pinout (VCC/HOLD/SCK/SI/CS/SO/WP/GND); no dBGA2 option | Selected for ultra-low-voltage (1.7 V) operation or space-constrained layouts requiring TSSOP footprint |
Compared with M95256-DW and BR25H256FJ-2CE2, AT25256AW-10SU-2.7 offers broader voltage flexibility (2.7–5.5 V), dual SPI mode support, integrated HOLD functionality, and consistent pinout across multiple package types - making it optimal for industrial designs requiring robust communication suspension and legacy microcontroller compatibility.
Availability
AT25256AW-10SU-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 temperature ranges and long production lifecycles.
Supply support for AT25256AW-10SU-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
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on embedded control and connectivity.
The AT25256AW-10SU-2.7 belongs to Microchip's legacy Atmel SPI EEPROM product line, designed specifically for industrial and commercial systems demanding reliable, low-power, and easy-to-integrate nonvolatile storage with hardware-based data protection.
FAQ
What is the maximum clock frequency supported by AT25256AW-10SU-2.7?
The AT25256AW-10SU-2.7 supports up to 20 MHz SCK frequency when operated at 5.0 V. At 2.7–3.6 V, the maximum clock rate is reduced to 10 MHz, and at 1.8–2.7 V (not applicable to this -2.7 variant), it drops to 5 MHz. These limits ensure setup/hold timing margins are met across voltage and temperature ranges per Table 1-3 in the datasheet.
Does AT25256AW-10SU-2.7 support both SPI Mode 0 and Mode 3?
Yes, AT25256AW-10SU-2.7 explicitly supports SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as stated in its Features section. This dual-mode capability allows seamless integration with microcontrollers that default to either polarity/phase configuration without requiring additional software abstraction layers.
How does the WRITE PROTECT (WP) pin function in AT25256AW-10SU-2.7?
In AT25256AW-10SU-2.7, the WP pin inhibits writes to the status register only when the WPEN bit is set to "1" and WP is driven low. If WPEN = 0, the WP pin is disabled and has no effect. This design allows system designers to tie WP to ground while retaining full status register configurability during initial programming, then enable hardware protection post-deployment.
What package type is used for AT25256AW-10SU-2.7?
AT25256AW-10SU-2.7 uses an 8-lead EIAJ SOIC package (package code "S2"), with 0.209" body width, gull-wing leads, and RoHS-compliant lead-free finish. Its dimensions are 5.13–5.35 mm × 7.70–8.26 mm × 1.70–2.16 mm, conforming to EIAJ ED-7320 standards.
Is AT25256AW-10SU-2.7 suitable for automotive applications?
No - AT25256AW-10SU-2.7 is specified for industrial temperature range (−40°C to +85°C) and is not qualified to AEC-Q100 automotive standards. While it may function in some automotive body electronics, Microchip explicitly states in its disclaimer that Atmel products "are not intended, authorized, or warranted for use as components in applications intended to support or sustain life," including automotive safety systems.
AT25256AW-10SU-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:
- 20 MHz
- Write Cycle Time - Word, Page:
- 5ms
- 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
AT25256AW-10SU-2.7 FAQ
1.How can I place an order for AT25256AW-10SU-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256AW-10SU-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 AT25256AW-10SU-2.7 reliable?
The price and inventory of AT25256AW-10SU-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 AT25256AW-10SU-2.7 is usually 5 days.
3.What payment methods are accepted for AT25256AW-10SU-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256AW-10SU-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256AW-10SU-2.7?
AT25256AW-10SU-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256AW-10SU-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 AT25256AW-10SU-2.7?
For technical support, including AT25256AW-10SU-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256AW-10SU-2.7 requirements.
6.How does Aetrix verify that AT25256AW-10SU-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25256AW-10SU-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 AT25256AW-10SU-2.7 meets industry standards.
7.What is the process for return or replacement of AT25256AW-10SU-2.7?
All AT25256AW-10SU-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25256AW-10SU-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 AT25256AW-10SU-2.7 part is unused and in its original packaging.
Return procedure for AT25256AW-10SU-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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