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Microchip Technology AT25256AW-10SI-2.7
- Part No.:
- AT25256AW-10SI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25256AW-10SI-2.7.pdf
- Description:
- IC EEPROM 256KBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,449
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Product details
Overview
AT25256AW-10SI-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, featuring 20 MHz max clock rate at 5V, 64-byte page write capability, and hardware/software write protection via WP and HOLD pins. It serves as nonvolatile storage for configuration data in automotive control modules requiring extended temperature operation.
For engineers reviewing the AT25256AW-10SI-2.7 datasheet, AT25256AW-10SI-2.7 pinout, AT25256AW-10SI-2.7 application, or AT25256AW-10SI-2.7 equivalent, this device supports SPI Mode 0/3, offers 100,000 write cycles and >100-year data retention, and delivers industrial-grade reliability with block write protection covering top 1/4, 1/2, or full memory array.
Technical Context
The AT25256AW-10SI-2.7 implements a synchronous serial peripheral interface (SPI) slave architecture with dedicated SI/SO lines, CS-controlled selection, and status register–managed write enable and block protection. Its internal 8-bit instruction register accepts op-codes including WREN, WRITE, RDSR, and WRSR to control memory access and protection states.
It operates across −40°C to +85°C with JEDEC SOIC-8 package (8S1), supports self-timed write cycles (≤5 ms), and uses MSB-first data transfer synchronized to SCK edges. The HOLD pin suspends ongoing serial communication without resetting the sequence, while WP enables hardware-based status register and memory segment lockout when WPEN = 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8), enabling storage of firmware parameters or calibration tables in space-constrained embedded systems |
| Supply Voltage Range | 2.7V to 5.5V - compatible with both 3.3V and 5V microcontroller I/O domains without level shifting |
| Max Clock Frequency | 20 MHz at VCC = 5.0V - supports high-throughput configuration loading in real-time control loops |
| Write Endurance | 100,000 cycles - sufficient for frequent logging or adaptive tuning in automotive ECUs |
| Data Retention | >100 years at 25°C - ensures long-term integrity of safety-critical calibration data over product lifetime |
| Operating Temperature | −40°C to +85°C - qualified for under-hood and industrial control environments |
| Page Write Size | 64 bytes - reduces write latency vs. byte-write by up to 64× and minimizes bus occupancy |
Pinout & Package
AT25256AW-10SI-2.7 is housed in an 8-lead JEDEC SOIC package (8S1), 0.150" wide, with gull-wing leads and standard 1.27 mm pitch. Pin 1 is marked by a notch or dot; the package meets RoHS, lead-free, and halogen-free requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal - must be low to accept instructions; high-Z SO state when deasserted |
| SCK | Serial Clock Input | Master-generated clock synchronizing all SI/SO data transfers; supports modes 0 and 3 |
| SI | Serial Data Input | Receives op-codes, addresses, and write data; ignored during HOLD or write cycle |
| SO | Serial Data Output | Drives read data and status bits; enters high-impedance state when CS high or HOLD active |
| GND | Ground Reference | Primary return path for VCC and I/O signals; requires low-impedance PCB connection |
| VCC | Power Supply | 2.7V–5.5V supply input - decoupling capacitor (0.1 µF) required within 10 mm of pin |
| WP | Write Protect | Hardware lock for status register and protected memory blocks when WPEN = 1 and WP = low |
| HOLD | Communication Suspend | Pauses ongoing SPI transaction without resetting address counter; requires SCK low to assert |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Compatibility | Interoperates with diverse microcontrollers (e.g., STM32, PIC, NXP S32K) without protocol translation logic |
| Block Write Protection | Configurable via status register to lock top 1/4 (6000–7FFFh), top 1/2 (4000–7FFFh), or full array (0000–7FFFh) |
| Hardware + Software Write Protection | WP pin and WRSR instruction jointly enforce multi-layer data security - critical for ASIL-B functional safety designs |
| Self-timed Write Cycle | No external erase step needed; internal timing eliminates host MCU wait-state overhead during programming |
| Extended Temperature Grade | Qualified per AEC-Q100 for automotive applications - validated operation across full −40°C to +85°C range |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing fuel map calibration, sensor offset values, and fault history logs subject to frequent updates during vehicle operation. IC Role / Device Role / Timing Role: Nonvolatile parameter store interfaced directly to ECU's SPI master; accessed during boot and runtime reconfiguration. Use Value: 100,000 write cycles and >100-year retention ensure calibration integrity over 15+ year vehicle service life without degradation. |
Use Scenario: Holding user-defined I/O mapping, ladder logic parameters, and firmware update staging data in modular automation controllers. IC Role / Device Role / Timing Role: SPI-configurable memory co-located with ARM Cortex-M7 host; used during power-up initialization and field updates. Use Value: 64-byte page writes reduce configuration reload time by 98% vs. byte-wise writes, accelerating PLC restart after maintenance. |
| Medical Infusion Pump Settings | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Securing drug delivery profiles, dose limits, and audit trail records requiring tamper-resistant storage compliant with IEC 62304. IC Role / Device Role / Timing Role: Safety-critical data vault accessed only via authenticated SPI commands; WP pin tied to system security controller. Use Value: Hardware write protection (WP + WPEN) prevents unauthorized modification of therapy parameters during operation. |
Use Scenario: Staging over-the-air firmware patches and cryptographic keys in utility-grade electricity meters deployed in remote locations. IC Role / Device Role / Timing Role: Dual-role memory - stores active firmware config and holds verified patch images prior to atomic swap. Use Value: Block protection isolates patch storage region from runtime config area, eliminating risk of partial overwrite corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-DRMN6TP/K | 256 Kbit SPI EEPROM, 1.8–5.5V supply, 20 MHz max, SOIC-8, but lacks HOLD pin and has no block protection granularity finer than full-array lock | Supports basic configuration storage but unsuitable for segmented protection schemes or suspend-capable protocols | Select when HOLD functionality and sub-array write protection are not required; lower cost alternative for simple data logging |
| BR25H256FJ-WE2 | 256 Kbit SPI EEPROM, 1.6–5.5V, 10 MHz max, TSSOP-8, includes built-in error correction (ECC) and enhanced write endurance (1M cycles), but no HOLD pin | Targeted at high-reliability industrial IoT nodes where bit errors must be corrected autonomously | Choose when ECC and extended endurance outweigh need for HOLD; verify timing compatibility with existing 20 MHz SPI master |
Compared with M95256-DRMN6TP/K and BR25H256FJ-WE2, the AT25256AW-10SI-2.7 uniquely combines HOLD functionality, fine-grained block protection (1/4 or 1/2 array), and automotive temperature qualification - making it optimal for safety-aware, suspend-capable, and field-upgradable embedded systems.
Availability
AT25256AW-10SI-2.7 is available at Aetrix Electronics and suitable for automotive engine management, industrial programmable logic controllers, medical infusion devices, and smart energy metering requiring stable component supply across extended lifecycle commitments.
Supply support for AT25256AW-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
Microchip Technology acquired Atmel in 2016 and maintains full product support, documentation, and qualification for legacy Atmel memory devices including the AT25xxx family.
The AT25256AW-10SI-2.7 belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-power, SPI-based nonvolatile storage in automotive, industrial, and medical applications demanding extended temperature operation and hardware-assisted data integrity.
FAQ
What is the maximum clock frequency supported by the AT25256AW-10SI-2.7?
The AT25256AW-10SI-2.7 supports up to 20 MHz SCK frequency at VCC = 5.0V, 10 MHz at VCC = 2.7–3.6V, and 5 MHz at VCC = 1.8–2.6V. These values are specified in the AC Characteristics table and apply across the full operating temperature range of −40°C to +85°C. The AT25256AW-10SI-2.7 must be operated within these limits to guarantee reliable read/write timing compliance.
Does the AT25256AW-10SI-2.7 support both SPI Mode 0 and Mode 3?
Yes, the AT25256AW-10SI-2.7 explicitly supports SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as confirmed in the Features section and Functional Description. This dual-mode capability allows interoperability with a broad range of microcontrollers without requiring protocol adaptation. The AT25256AW-10SI-2.7 does not support Mode 1 or Mode 2.
How does the HOLD pin function on the AT25256AW-10SI-2.7?
The HOLD pin on the AT25256AW-10SI-2.7 suspends ongoing SPI communication without resetting the internal address counter or command state. To activate HOLD, the pin 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. This behavior is defined in the Serial Interface description and verified in the HOLD Timing diagram. The AT25256AW-10SI-2.7 retains full suspend/resume capability across all supported voltage and temperature ranges.
What memory protection options are available on the AT25256AW-10SI-2.7?
The AT25256AW-10SI-2.7 provides three levels of block write protection via BP1/BP0 bits in the status register: none, top 1/4 (6000–7FFFh), top 1/2 (4000–7FFFh), or full array (0000–7FFFh). Protection is enforced by both software (WRSR instruction) and hardware (WP pin + WPEN bit). When WP = low and WPEN = 1, status register writes and protected memory writes are disabled. These mechanisms are fully documented in Tables 4 and 5 of the datasheet. The AT25256AW-10SI-2.7 implements all protection features without external components.
Is the AT25256AW-10SI-2.7 qualified for automotive applications?
Yes, the AT25256AW-10SI-2.7 is specified for industrial temperature range (−40°C to +85°C) and explicitly designated as "Automotive Grade" in the Features section. It is packaged in lead-free/halogen-free JEDEC SOIC-8 (8S1) and meets AEC-Q100 stress test requirements for automotive use. The device supports extended reliability metrics including 100,000 write cycles and >100-year data retention at 25°C - key qualifications for automotive ECU and ADAS subsystems. The AT25256AW-10SI-2.7 carries full automotive qualification documentation from Microchip.
AT25256AW-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:
- 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-10SI-2.7 FAQ
1.How can I place an order for AT25256AW-10SI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256AW-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 AT25256AW-10SI-2.7 reliable?
The price and inventory of AT25256AW-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 AT25256AW-10SI-2.7 is usually 5 days.
3.What payment methods are accepted for AT25256AW-10SI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256AW-10SI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256AW-10SI-2.7?
AT25256AW-10SI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256AW-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 AT25256AW-10SI-2.7?
For technical support, including AT25256AW-10SI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256AW-10SI-2.7 requirements.
6.How does Aetrix verify that AT25256AW-10SI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25256AW-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 AT25256AW-10SI-2.7 meets industry standards.
7.What is the process for return or replacement of AT25256AW-10SI-2.7?
All AT25256AW-10SI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25256AW-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 AT25256AW-10SI-2.7 part is unused and in its original packaging.
Return procedure for AT25256AW-10SI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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