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Microchip Technology AT25256AN-10SU-2.7
- Part No.:
- AT25256AN-10SU-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25256AN-10SU-2.7.pdf
- Description:
- IC EEPROM 256KBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,926
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Product details
Overview
AT25256AN-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 serves as nonvolatile data storage in industrial control modules requiring low-voltage operation and high reliability.
For engineers reviewing the AT25256AN-10SU-2.7 datasheet, AT25256AN-10SU-2.7 pinout, AT25256AN-10SU-2.7 application, or AT25256AN-10SU-2.7 equivalent, key selection criteria include SPI Mode 0/3 compatibility, 1 million write endurance, >100-year data retention, block write protection granularity (1/4, 1/2, or full array), and SOIC-8 package footprint compatibility with legacy designs.
Technical Context
The AT25256AN-10SU-2.7 implements a synchronous serial peripheral interface (SPI) slave architecture with separate SI (input) and SO (output) lines, supporting both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). Its instruction set includes WREN/WRDI for write enable/disable, RDSR/WRSR for status register access, and READ/WRITE for memory access - all MSB-first with CS falling-edge initiation.
Internal timing is self-contained: write cycles complete in ≤5 ms without external erase commands; block protection is configured via BP0/BP1 bits in the nonvolatile status register, while WPEN enables hardware lock of the status register when WP is low. HOLD suspends ongoing transfers without resetting the sequence, and CS must remain low during multi-byte reads to enable automatic address increment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32,768 × 8), enabling storage of firmware patches or calibration tables in space-constrained embedded systems |
| Supply Voltage Range | 2.7V to 5.5V - supports direct integration into 3.3V and 5V microcontroller buses without level-shifting |
| Max Clock Frequency | 20 MHz at VCC = 5V - delivers up to 2.5 MB/s effective serial throughput for rapid configuration loading |
| Write Endurance | 1 million cycles - suitable for logging applications with frequent parameter updates (e.g., energy meter tariff counters) |
| Data Retention | >100 years at +25°C - ensures long-term integrity of stored device IDs, security keys, or calibration coefficients |
| Page Write Size | 64 bytes - minimizes write latency versus byte-write; requires software management of page boundaries |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments including factory automation and outdoor telemetry units |
Pinout & Package
AT25256AN-10SU-2.7 is supplied in an 8-lead JEDEC SOIC (8S1) package, 0.150" wide body, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates serial communication on falling edge and terminates on rising edge - required before any op-code transmission |
| SCK | Serial Clock | Master-generated clock input; defines timing for SI sampling and SO output - supports up to 20 MHz at 5V |
| SI | Serial Data Input | Receives op-codes, addresses, and write data MSB-first; ignored during HOLD or when CS is high |
| SO | Serial Data Output | Drives read data MSB-first; enters high-impedance state when CS is high or during internal write cycle |
| WP | Write Protect | Hardware lock for status register when WPEN=1; prevents accidental modification of BP0/BP1 or WPEN bits |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting address counter - allows master to service higher-priority interrupts |
| VCC | Power Supply | Primary supply rail (2.7–5.5V); powers internal logic and charge pump for write operations |
| GND | Ground Reference | Return path for all I/O and internal circuitry; must be low-impedance to maintain noise immunity during fast transitions |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Interoperability with diverse microcontrollers (e.g., ARM Cortex-M, PIC, STM32) without protocol translation logic |
| Block Write Protection | Configurable 1/4, 1/2, or full-array lock via status register - secures boot code or regulatory calibration data from overwrite |
| Self-timed Write Cycle | No external erase command needed; ≤5 ms max duration eliminates need for polling overhead in time-critical firmware |
| Low Standby Current | 0.5 µA typical at 2.7V - extends battery life in portable instrumentation and wireless sensor nodes |
| Industrial Temp Range | −40°C to +85°C operation - validated for deployment in motor drives, PLC I/O modules, and HVAC controllers |
Applications
| Industrial Sensor Calibration Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing temperature-compensated offset/gain coefficients for analog front-end sensors in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during power-up initialization and field recalibration routines. Use Value: Enables traceable, field-updatable calibration without soldering or firmware reflash - leveraging 1M endurance and >100-year retention. | Use Scenario: Holding patient-specific therapy parameters and device serialization data in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for FDA-required audit logs and safety-critical settings. Use Value: Hardware write protection (WP pin + BP bits) prevents unauthorized parameter changes during clinical use. |
| Automotive Body Control Module NVM | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Retaining window position memory, mirror angle presets, and lighting profiles across ignition cycles in BCMs. IC Role / Device Role / Timing Role: Low-power serial EEPROM interfaced directly to 3.3V CAN microcontroller SPI bus. Use Value: 2.7–5.5V operation accommodates automotive battery transients; SOIC-8 footprint simplifies PCB layout reuse. | Use Scenario: Storing encrypted firmware delta patches downloaded over PLC or RF links for remote meter upgrades. IC Role / Device Role / Timing Role: High-reliability data buffer between secure bootloader and flash memory controller. Use Value: 64-byte page writes reduce OTA update time; 20 MHz clock enables fast patch verification prior to flash commit. |
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 | STMicroelectronics 256 Kbit SPI EEPROM; identical 8-lead SOIC package, same 2.7–5.5V range, but rated for −40°C to +125°C extended temp | Preferred for under-hood automotive applications where ambient exceeds +85°C | Select when extended temperature qualification is mandatory; otherwise AT25256AN-10SU-2.7 offers proven industrial reliability at lower cost |
| BR25H256FJ-2CE2 | Rohm 256 Kbit SPI EEPROM; 8-lead TSSOP package (8A2), 1.7–5.5V supply, 10 MHz max clock at 1.8V | Better suited for ultra-low-power battery-powered devices with 1.8V logic interfaces | Choose for 1.8V system integration or space-constrained layouts requiring TSSOP; AT25256AN-10SU-2.7 remains optimal for 3.3V/5V industrial SOIC designs |
Compared with M95256-DRMN6TP/K and BR25H256FJ-2CE2, AT25256AN-10SU-2.7 provides the best balance of industrial temperature compliance, SOIC-8 footprint compatibility, and 20 MHz performance at 5V - making it ideal for cost-sensitive, volume industrial control applications where extended temp or sub-1.8V operation is not required.
Availability
AT25256AN-10SU-2.7 is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, and smart energy metering requiring stable component supply and long-term lifecycle support.
Supply support for AT25256AN-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 acquired Atmel in 2016 and maintains its serial EEPROM portfolio with focus on reliability, longevity, and industrial-grade qualification.
The AT25256A family was designed for robust nonvolatile data storage in resource-constrained embedded systems where SPI interface simplicity, low voltage operation, and high endurance are critical - especially in factory automation and infrastructure monitoring.
FAQ
What is the maximum SPI clock frequency supported by AT25256AN-10SU-2.7?
AT25256AN-10SU-2.7 supports up to 20 MHz at VCC = 5.0V, 10 MHz at VCC = 2.7–3.6V, and 5 MHz at VCC = 1.8–2.7V. The actual usable frequency depends on voltage level and board-level signal integrity - for reliable operation at 20 MHz, ensure controlled-impedance routing and proper decoupling near VCC/GND pins of AT25256AN-10SU-2.7.
Does AT25256AN-10SU-2.7 require an external erase command before writing?
No, AT25256AN-10SU-2.7 does not require a separate erase command. All write operations - whether byte or page - are self-timed and internally manage cell erasure and programming. A Write Enable (WREN) instruction must precede each write sequence, and the device automatically returns to write-disable state after completion. This simplifies firmware design for AT25256AN-10SU-2.7 integration.
How is block write protection configured on AT25256AN-10SU-2.7?
Block write protection on AT25256AN-10SU-2.7 is configured by setting BP0 and BP1 bits in the nonvolatile status register using the WRSR instruction. These bits define protection levels: 00 = no protection, 01 = top 1/4 (6000–7FFFh), 10 = top 1/2 (4000–7FFFh), 11 = full array (0000–7FFFh). WPEN bit must be '1' and WP pin held low to activate hardware lock of these bits.
Can AT25256AN-10SU-2.7 operate with a 1.8V microcontroller SPI interface?
AT25256AN-10SU-2.7 is specified for 2.7–5.5V operation and is not guaranteed to function reliably with 1.8V I/O signaling. While DC input thresholds allow some margin (VIH min = 0.7×VCC), the 1.8V variant part number is AT25256AN-10SU-1.8. Using AT25256AN-10SU-2.7 with 1.8V logic risks setup/hold violations and read failures - always match the suffix (-2.7 or -1.8) to your system's VCC.
What is the purpose of the HOLD pin on AT25256AN-10SU-2.7?
The HOLD pin on AT25256AN-10SU-2.7 allows a master microcontroller to temporarily suspend an ongoing SPI transaction - such as a multi-byte read - without resetting the internal address counter or losing synchronization. When HOLD is pulled low while SCK is low, SO goes high-impedance and SI is ignored; resuming requires bringing HOLD high while SCK remains low. This enables interrupt servicing without restarting the AT25256AN-10SU-2.7 communication sequence.
AT25256AN-10SU-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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
AT25256AN-10SU-2.7 FAQ
1.How can I place an order for AT25256AN-10SU-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256AN-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 AT25256AN-10SU-2.7 reliable?
The price and inventory of AT25256AN-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 AT25256AN-10SU-2.7 is usually 5 days.
3.What payment methods are accepted for AT25256AN-10SU-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256AN-10SU-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256AN-10SU-2.7?
AT25256AN-10SU-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256AN-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 AT25256AN-10SU-2.7?
For technical support, including AT25256AN-10SU-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256AN-10SU-2.7 requirements.
6.How does Aetrix verify that AT25256AN-10SU-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25256AN-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 AT25256AN-10SU-2.7 meets industry standards.
7.What is the process for return or replacement of AT25256AN-10SU-2.7?
All AT25256AN-10SU-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25256AN-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 AT25256AN-10SU-2.7 part is unused and in its original packaging.
Return procedure for AT25256AN-10SU-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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