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Microchip Technology AT25256-10UI-2.7
- Part No.:
- AT25256-10UI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFBGA
- Datasheet:
-
AT25256-10UI-2.7.pdf
- Description:
- IC EEPROM 256KBIT SPI 3MHZ 8DBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,785
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Product details
Overview
AT25256-10UI-2.7 from Microchip Technology (formerly Atmel) is a 256 Kbit SPI serial EEPROM organized as 32,768 × 8-bit memory array, operating at 2.7V–5.5V supply, supporting 3 MHz clock rate, 64-byte page write, and hardware/software write protection via WP and HOLD pins. It serves as nonvolatile configuration storage in industrial controllers, medical diagnostics, and automotive body electronics.
For engineers reviewing the AT25256-10UI-2.7 datasheet, AT25256-10UI-2.7 pinout, AT25256-10UI-2.7 application, or AT25256-10UI-2.7 equivalent, key selection criteria include its 2.7V low-voltage operation, 100,000 write endurance, >200-year data retention, SOIC-8 package compatibility, and SPI Mode 0/3 interface timing compliance.
Technical Context
The AT25256-10UI-2.7 implements a synchronous SPI slave interface with separate SI (input) and SO (output) pins, requiring CS activation and MSB-first data framing. Its internal instruction register supports WREN/WRDI/RDSR/WRSR/READ/WRITE op-codes, with status register bits BP0/BP1 enabling 1/4, 1/2, or full-array block write protection.
It features dual-level write protection: software-controlled via WRSR and hardware-enforced via the WP pin when WPEN=1, while HOLD suspends ongoing serial transfers without resetting sequence state. All write cycles are self-timed (5 ms typical), eliminating external erase requirements and enabling byte/page writes without pre-erase.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32,768 × 8-bit array), sufficient for firmware parameter tables or calibration data in space-constrained designs. |
| Supply Voltage Range | 2.7V to 5.5V - enables direct integration into mixed-voltage systems without level-shifting for 3.3V or 5V microcontrollers. |
| Max Clock Frequency | 3 MHz - supports high-throughput configuration reads/writes in real-time embedded applications. |
| Write Endurance | 100,000 cycles - ensures reliable logging or field-updatable settings over product lifetime. |
| Data Retention | >200 years - guarantees long-term integrity of stored calibration coefficients or security keys without refresh. |
| Page Write Size | 64 bytes - reduces write latency versus byte-wise programming and aligns with common MCU DMA buffer sizes. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
AT25256-10UI-2.7 is housed in an 8-pin EIAJ SOIC (0.200" wide) package, pin-compatible with JEDEC SOIC-8 footprints and optimized for automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-low enable signal; must be held low during entire SPI transaction to assert device on shared bus. |
| 2 (SCK) | Serial Clock Input | Synchronous timing reference from master; supports SPI Modes 0 and 3 with min/max tWH/tWL per voltage grade. |
| 3 (SI) | Serial Data Input | Receives op-codes, addresses, and write data; sampled on SCK rising edge in Mode 0. |
| 4 (SO) | Serial Data Output | Drives read data and status bits; tri-stated when CS is high or HOLD is active. |
| 5 (WP) | Write Protect | Hardware lock: disables status register writes when low and WPEN=1, preventing accidental reconfiguration. |
| 6 (HOLD) | Serial Communication Suspend | Pauses ongoing SPI transfer (e.g., during interrupt servicing) without losing address pointer or command state. |
| 7 (GND) | Ground Reference | Return path for all I/O and power currents; requires low-impedance connection to minimize noise coupling. |
| 8 (VCC) | Power Supply | 2.7V–5.5V input; decoupling capacitor (0.1 µF) required within 10 mm for stable read/write margins. |
Key Features
| Feature | Design Value |
|---|---|
| Block Write Protection | Configurable via status register to protect top 1/4, top 1/2, or entire memory array - prevents corruption of critical boot parameters. |
| Self-timed Write Cycle | 5 ms typical duration with no external timing control needed - simplifies firmware design and eliminates busy-wait loops. |
| Low Standby Current | 0.2 µA max at 2.7V - extends battery life in portable diagnostic tools or wireless sensor nodes. |
| ESD Robustness | >4000 V HBM - withstands handling and board-level ESD events without latch-up or parametric shift. |
| HOLD Pin Functionality | Preserves internal address and command state during suspension - enables deterministic multi-tasking in RTOS-based systems. |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing I/O mapping tables, calibration offsets, and fault history logs in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed via SPI during boot and runtime; supports infrequent writes but frequent reads with guaranteed 200-year retention. Use Value: Eliminates need for external backup batteries or supercapacitors while maintaining data integrity across power cycles and thermal stress. |
Use Scenario: Holding seat position presets, mirror angle configurations, and lighting profiles in automotive BCMs operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: SPI-connected configuration memory interfaced directly with 3.3V microcontroller; leverages WP pin for tamper-resistant storage of safety-critical defaults. Use Value: Enables OEM-specific personalization without firmware updates and meets AEC-Q100 Grade 3 temperature requirements. |
| Medical Diagnostic Equipment Calibration | Smart Energy Meter Firmware Parameters |
Use Scenario: Archiving sensor gain/offset coefficients and test result thresholds in portable ultrasound or blood glucose analyzers. IC Role / Device Role / Timing Role: High-reliability data logger with 100,000 write cycles; accessed during device self-test and calibration routines using SPI Mode 0 timing. Use Value: Ensures traceable, repeatable measurements across device lifetime and regulatory audit cycles (IEC 62304 Class B). |
Use Scenario: Storing tariff schedules, metering constants, and communication protocol keys in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Secure configuration vault with hardware write protection (WP pin + WPEN bit) preventing unauthorized parameter modification. Use Value: Meets ANSI/IEEE 1373 security mandates by blocking writes to protected sectors during field deployment. |
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-pin SOIC package, 2.5–5.5V range, 20 MHz max clock, 400 µA ICC read current. | Higher speed and lower standby current (1 µA), but lacks HOLD pin - unsuitable for interrupt-driven suspend scenarios. | Select when system prioritizes throughput over suspend capability and uses 2.5V minimum supply. |
| BR25H256FJ-2CE2 | Rohm 256 Kbit SPI EEPROM; 8-pin SOP-J8 package, 1.7–5.5V range, 10 MHz max clock, integrated VCC detector and reset logic. | Includes power-on reset and voltage monitoring - adds system-level reliability but increases BOM count if those functions are already handled externally. | Choose when robust power sequencing and brown-out immunity are required beyond basic EEPROM functionality. |
Compared with M95256-DRMN6TP/K and BR25H256FJ-2CE2, AT25256-10UI-2.7 offers unique HOLD functionality for deterministic SPI pause/resume and proven 2.7V–5.5V interoperability with legacy 5V microcontrollers, making it optimal for industrial retrofit and automotive replacement designs where timing predictability and voltage flexibility are critical.
Availability
AT25256-10UI-2.7 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, extended temperature operation, and long-term data retention.
Supply support for AT25256-10UI-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 technical and manufacturing continuity for the AT25xxx EEPROM family.
The AT25256-10UI-2.7 belongs to Microchip's serial EEPROM product line, engineered for robust nonvolatile storage in harsh environments where reliability, low-voltage operation, and SPI compatibility are essential.
FAQ
What is the maximum clock frequency supported by the AT25256-10UI-2.7?
The AT25256-10UI-2.7 supports a maximum SCK clock frequency of 3 MHz across its full 2.7V–5.5V supply range. This value is validated per AC Characteristics table in the datasheet and applies to both read and write operations. Exceeding this limit may cause data corruption or command misinterpretation, so firmware drivers must enforce strict timing compliance.
Does the AT25256-10UI-2.7 require an external erase cycle before writing?
No, the AT25256-10UI-2.7 does not require a separate erase cycle. All write operations - whether byte or 64-byte page - are self-timed and internally managed. The device automatically erases targeted memory locations prior to programming, enabling direct overwrite without pre-erase commands or delays.
How does the HOLD pin function during an active SPI transaction?
When the HOLD pin is pulled low while SCK is low, the AT25256-10UI-2.7 immediately suspends serial communication without resetting the internal address counter or command state. SO goes 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 paused.
What is the purpose of the WPEN bit in the status register of the AT25256-10UI-2.7?
The WPEN (Write Protect Enable) bit controls whether the physical WP pin affects write protection. When WPEN = 1, pulling WP low blocks all status register writes; when WPEN = 0, the WP pin is ignored. This allows safe installation in systems with WP tied to ground while retaining ability to configure block protection via software.
Can the AT25256-10UI-2.7 be used in automotive applications?
Yes - the "I" suffix in AT25256-10UI-2.7 denotes Industrial temperature grade (−40°C to +85°C), which satisfies under-hood and cabin module requirements in many automotive applications. It is commonly deployed in body control modules and infotainment systems where AEC-Q100 qualification is not mandated but extended temperature operation is required.
AT25256-10UI-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFBGA
- Packaging:
- Tray
- 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:
- 3 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-dBGA (5.21x3.4)
AT25256-10UI-2.7 FAQ
1.How can I place an order for AT25256-10UI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256-10UI-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 AT25256-10UI-2.7 reliable?
The price and inventory of AT25256-10UI-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 AT25256-10UI-2.7 is usually 5 days.
3.What payment methods are accepted for AT25256-10UI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256-10UI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256-10UI-2.7?
AT25256-10UI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256-10UI-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 AT25256-10UI-2.7?
For technical support, including AT25256-10UI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256-10UI-2.7 requirements.
6.How does Aetrix verify that AT25256-10UI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25256-10UI-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 AT25256-10UI-2.7 meets industry standards.
7.What is the process for return or replacement of AT25256-10UI-2.7?
All AT25256-10UI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25256-10UI-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 AT25256-10UI-2.7 part is unused and in its original packaging.
Return procedure for AT25256-10UI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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