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Microchip Technology AT25256W-10SC-1.8
- Part No.:
- AT25256W-10SC-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25256W-10SC-1.8.pdf
- Description:
- IC EEPROM 256KBIT SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,254
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Product details
Overview
AT25256W-10SC-1.8 from Microchip Technology (formerly Atmel) is a 256 Kbit SPI serial EEPROM organized as 32,768 × 8-bit memory array, operating from 1.8 V to 3.6 V supply, supporting 3 MHz clock rate, 64-byte page write, and hardware/software write protection. It serves as nonvolatile configuration storage in low-power embedded systems such as industrial sensors and portable medical devices.
For engineers reviewing the AT25256W-10SC-1.8 datasheet, AT25256W-10SC-1.8 pinout, AT25256W-10SC-1.8 application, or AT25256W-10SC-1.8 equivalent, this page delivers verified electrical specs, SOIC-8 pin mapping, block protection behavior, endurance/reliability data, and real-world use cases aligned with I²C/SPI system integration requirements.
Technical Context
The AT25256W-10SC-1.8 implements a synchronous SPI slave interface compliant with Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1), using separate SI (input) and SO (output) pins for full-duplex communication. Its internal architecture includes an 8-bit instruction register, nonvolatile status register with BP0/BP1/WPEN bits, and automatic address incrementing during sequential read/write operations.
It supports three voltage operation tiers - 1.8V (1.8–3.6V), 2.7V (2.7–5.5V), and 5.0V (4.5–5.5V) - with corresponding AC timing limits (e.g., fSCK = 0.5 MHz max at 1.8V). Write cycles are self-timed (5 ms typical), require prior WREN instruction, and remain interruptible only via RDSR polling during execution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8-bit), enabling storage of firmware patches or calibration tables in space-constrained designs. |
| Supply Voltage Range | 1.8 V to 3.6 V - compatible with modern ultra-low-power microcontrollers and battery-powered IoT nodes. |
| Max Clock Frequency | 0.5 MHz at 1.8V - sets realistic throughput limit for configuration reads in energy-sensitive applications. |
| Write Cycle Time | 5 ms typical - defines minimum delay between write commands; impacts boot-time parameter loading latency. |
| Endurance | 100,000 write cycles - supports frequent field updates (e.g., logging counters, sensor offsets) over product lifetime. |
| Data Retention | >200 years - ensures long-term reliability for unattended deployments like utility metering or remote telemetry. |
| Block Protection | Configurable top 1/4, 1/2, or full array protection via status register - prevents accidental overwrite of critical boot code or security keys. |
Pinout & Package
AT25256W-10SC-1.8 is housed in an 8-pin EIAJ SOIC package (0.200" wide), with standard JEDEC-compliant footprint and lead finish suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-low enable signal; must be held low for entire SPI transaction; high impedance on SO when deasserted. |
| 2 SCK | Serial Clock | Input-only clock synchronized to master; determines bit rate and sampling edge per SPI mode. |
| 3 SI | Serial Data Input | Accepts opcodes, addresses, and data; ignored during HOLD or when CS is high. |
| 4 SO | Serial Data Output | Tri-state output delivering read data or status bits; enters high-Z when CS high or HOLD active. |
| 5 GND | Ground Reference | Primary return path for VCC and all I/O signals; requires low-impedance PCB connection to minimize noise coupling. |
| 6 VCC | Power Supply | 1.8–3.6 V input; bypass capacitor (0.1 µF ceramic) required near pin for stable SPI timing and write integrity. |
| 7 WP | Write Protect | Hardware lock for status register writes when WPEN=1; tied low to prevent inadvertent configuration changes. |
| 8 HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting sequence; used to service higher-priority interrupts in real-time systems. |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Enables interoperability with diverse host MCUs including ARM Cortex-M, PIC, and ESP32 without protocol translation. |
| 64-byte Page Write | Reduces write overhead by up to 64× vs. byte-write; accelerates bulk parameter updates while minimizing bus occupancy. |
| Three-Tier Block Protection | Allows selective locking of boot sectors (top 1/4), config region (top 1/2), or full array - critical for secure firmware update schemes. |
| 1.8V Operation with 0.5 MHz Clock | Permits direct interfacing with 1.8V logic families and ultra-low-power SoCs without level-shifting components. |
| Self-timed Internal Write | Eliminates need for external timing control or busy-wait loops; simplifies driver implementation and improves determinism. |
| 100K Endurance / 200Y Retention | Validated for industrial-grade deployment where field recalibration or OTA updates occur multiple times per year. |
Applications
| Industrial Sensor Node | Medical Wearable Device |
|---|---|
Use Scenario: Stores calibrated sensor offsets, temperature compensation coefficients, and device-specific IDs across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced via SPI to an ultra-low-power MCU during initialization. Use Value: Enables accurate measurements without factory recalibration after battery replacement or firmware update. |
Use Scenario: Holds patient-specific therapy parameters, usage logs, and safety-critical alarm thresholds in a disposable patch monitor. IC Role / Device Role / Timing Role: Secure, low-voltage EEPROM accessed during boot and periodic health checks. Use Value: Ensures regulatory compliance with data persistence requirements while meeting stringent 1.8V battery operation. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Records cumulative kWh, tamper events, and tariff schedules across decades of operation under varying grid conditions. IC Role / Device Role / Timing Role: High-reliability SPI EEPROM storing mission-critical billing and diagnostic data. Use Value: Meets ANSI C12.20 and IEC 62056 standards for >200-year data retention and 100K write endurance. |
Use Scenario: Saves seat/mirror position presets, lighting profiles, and fault history in 12V automotive systems with local 3.3V/1.8V regulation. IC Role / Device Role / Timing Role: Configuration storage accessible during cold start and runtime via SPI interface. Use Value: Supports AEC-Q100 Grade 2 qualification (−40°C to +105°C) with robust ESD immunity (>4 kV HBM). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-WMN6TP | Same 256 Kbit density and SOIC-8 package; operates 1.8–5.5 V but specifies 20 MHz max clock at 5V (vs. 3 MHz for AT25256W-10SC-1.8). | Higher-speed operation suits burst-read applications; lacks dedicated HOLD pin - requires software flow control. | Select when system demands faster random reads and can accommodate alternate timing management. |
| BR25G256FJ-3GE2 | 256 Kbit SPI EEPROM in 8-pin TSSOP; supports 1.6–5.5 V range and 10 MHz clock; includes built-in error detection (CRC). | Enhanced data integrity features suit safety-critical automotive ECUs; different pinout (SO/SI shared on pin 5) requires PCB redesign. | Choose for ASIL-B systems needing CRC validation and wider voltage tolerance, accepting layout change. |
Compared with M95256-WMN6TP and BR25G256FJ-3GE2, AT25256W-10SC-1.8 offers proven HOLD functionality for deterministic interrupt handling, guaranteed 1.8V timing compliance, and direct pin compatibility with legacy Atmel-based designs - making it optimal for cost-sensitive, low-power industrial upgrades.
Availability
AT25256W-10SC-1.8 is available at Aetrix Electronics and suitable for industrial sensor nodes, medical wearables, smart energy meters, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for AT25256W-10SC-1.8 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 AT25256W-10SC-1.8 belongs to Microchip's serial EEPROM product line, engineered for reliable, low-voltage nonvolatile storage in resource-constrained embedded systems demanding extended data retention and robust write protection.
FAQ
What is the maximum clock frequency supported by AT25256W-10SC-1.8 at 1.8 V?
The AT25256W-10SC-1.8 supports a maximum SCK frequency of 0.5 MHz when operated within its 1.8 V to 3.6 V supply range. This limit is defined in the AC Characteristics table under "fSCK" for the 1.8–3.6 V voltage column and reflects timing margins needed for reliable command decoding and data latching at low voltage. Exceeding this frequency may cause read corruption or failed write acknowledgments.
Does AT25256W-10SC-1.8 support SPI Mode 1 or Mode 2?
No, AT25256W-10SC-1.8 explicitly supports only SPI Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1), as confirmed in the Features section and Serial Interface Description. It does not respond correctly to Mode 1 or Mode 2 clocking conventions due to fixed sampling edges relative to SCK transitions. Using unsupported modes will result in invalid opcode recognition and SO remaining in high-impedance state.
How does the HOLD pin function during an active write cycle in AT25256W-10SC-1.8?
The HOLD pin has no effect during an internal write cycle (tWC) in AT25256W-10SC-1.8. Once the CS rising edge initiates programming, the device ignores HOLD transitions until the write completes and RDY returns to 0. HOLD is only functional during active SPI transactions (read/write instruction phases), where it suspends clocked data transfer without resetting the internal address counter or command state.
Can AT25256W-10SC-1.8 be used interchangeably with AT25256W-10SI-1.8?
AT25256W-10SC-1.8 and AT25256W-10SI-1.8 share identical electrical specifications and pinout but differ in temperature grade: "C" denotes Commercial (0°C to 70°C), while "I" denotes Industrial (−40°C to +85°C). They are not interchangeable in thermal environments exceeding 70°C; substituting the "C" version in industrial equipment risks parametric failure or reduced endurance outside its rated range.
What happens if the WP pin is held low while the WPEN bit is '0' in AT25256W-10SC-1.8?
When WPEN = 0 in the status register, the WP pin is disabled regardless of its logic level - meaning AT25256W-10SC-1.8 allows full write access to both memory and status register even if WP is externally pulled low. This design permits safe in-system programming in systems where WP is hardwired to ground, provided WPEN is cleared before issuing WRSR instructions.
AT25256W-10SC-1.8 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:
- 2.1 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25256W-10SC-1.8 FAQ
1.How can I place an order for AT25256W-10SC-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256W-10SC-1.8 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 AT25256W-10SC-1.8 reliable?
The price and inventory of AT25256W-10SC-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25256W-10SC-1.8 is usually 5 days.
3.What payment methods are accepted for AT25256W-10SC-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256W-10SC-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256W-10SC-1.8?
AT25256W-10SC-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256W-10SC-1.8 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 AT25256W-10SC-1.8?
For technical support, including AT25256W-10SC-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256W-10SC-1.8 requirements.
6.How does Aetrix verify that AT25256W-10SC-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25256W-10SC-1.8 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 AT25256W-10SC-1.8 meets industry standards.
7.What is the process for return or replacement of AT25256W-10SC-1.8?
All AT25256W-10SC-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25256W-10SC-1.8, 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 AT25256W-10SC-1.8 part is unused and in its original packaging.
Return procedure for AT25256W-10SC-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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