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Microchip Technology AT25256W-10SC-2.7
- Part No.:
- AT25256W-10SC-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25256W-10SC-2.7.pdf
- Description:
- IC EEPROM 256KBIT SPI 3MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,817
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Product details
Overview
AT25256W-10SC-2.7 from Microchip Technology (formerly Atmel) is a 256 Kbit SPI serial EEPROM organized as 32,768 × 8-bit memory array, operating from 2.7V to 5.5V with 3 MHz max clock rate, 64-byte page write capability, and hardware/software write protection via WP and HOLD pins. It serves as nonvolatile configuration storage in industrial controllers, automotive body modules, and embedded telemetry systems.
For engineers reviewing the AT25256W-10SC-2.7 datasheet, AT25256W-10SC-2.7 pinout, AT25256W-10SC-2.7 application, or AT25256W-10SC-2.7 equivalent, key selection criteria include VCC range compatibility (2.7–5.5 V), SOIC-8 package footprint, SPI Mode 0/3 timing compliance, and block-level write protection granularity (1/4, 1/2, or full array).
Technical Context
The AT25256W-10SC-2.7 implements a synchronous SPI slave interface with separate SI (input) and SO (output) lines, supporting MSB-first transmission and requiring WREN before WRITE. Its internal status register controls BP0/BP1 for block protection and WPEN for hardware write protect enablement.
It features self-timed 5 ms typical write cycles, no external erase requirement, and dual protection layers: software-configurable status register bits and hardware WP pin assertion. The HOLD pin suspends ongoing serial transfers without resetting the sequence, enabling multi-master arbitration support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32,768 × 8-bit array) - supports firmware parameter storage for mid-complexity embedded devices |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V system rails without level shifting |
| Max Clock Frequency | 3 MHz - enables fast configuration reads in time-critical boot sequences |
| Page Write Size | 64 bytes - minimizes write latency versus byte-write-only EEPROMs |
| Write Endurance | 100,000 cycles - sufficient for logging or calibration data updated daily over 27 years |
| Data Retention | >200 years - ensures long-term reliability in unpowered storage applications |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
AT25256W-10SC-2.7 is housed in an 8-pin EIAJ SOIC package (8S2), 0.200" wide, with standard gull-wing leads and JEDEC-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-low enable; must be low to accept SI data and drive SO output |
| 2 SO | Serial Data Output | Tri-state open-drain output; high-impedance when CS high or during HOLD |
| 3 WP | Write Protect | Hardware lock for status register writes when WPEN = 1 and WP = low |
| 4 GND | Ground Reference | Return path for VCC and all I/O; requires low-impedance PCB connection |
| 5 SI | Serial Data Input | CMOS-compatible input; latched on SCK rising edge in SPI Mode 0 |
| 6 SCK | Serial Clock Input | Master-generated clock; defines timing for SI sampling and SO output edges |
| 7 HOLD | Serial Transfer Suspend | Pauses communication mid-sequence when asserted low with SCK low |
| 8 VCC | Power Supply | Primary supply rail; decoupling capacitor required within 10 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 and 3 support | Interoperates with diverse microcontrollers including ARM Cortex-M, PIC, and MSP430 without mode translation logic |
| Block write protection (BP0/BP1) | Enables selective locking of top 1/4 (6000–7FFFh), top 1/2 (4000–7FFFh), or full array (0000–7FFFh) memory regions |
| WPEN bit control | Allows flexible hardware write protection: WP pin active only when WPEN = 1, enabling safe ground-tie installation |
| HOLD pin functionality | Permits interruption of read/write sequences without command reinitialization-critical for real-time interrupt handling |
| 100 k write cycles / >200 yr retention | Meets industrial lifecycle requirements for field-upgradable devices with infrequent but critical parameter updates |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing calibrated sensor offsets, I/O mapping tables, and firmware update flags in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed during power-on initialization and runtime parameter adjustment. Use Value: Enables field reconfiguration without firmware reflashing; 2.7–5.5 V operation matches 3.3 V PLC backplane supplies. |
Use Scenario: Holding door lock actuator profiles, mirror position presets, and lighting dimming curves in automotive BCMs across temperature extremes. IC Role / Device Role / Timing Role: SPI-connected parameter memory interfaced to an 8-bit or 32-bit automotive MCU via dedicated GPIO-controlled CS. Use Value: −40°C to +85°C rating ensures reliability in engine bay proximity; WP/HOLD pins support safe over-the-air update sequencing. |
| Medical Infusion Pump Calibration Data | Smart Energy Meter Firmware Parameters |
Use Scenario: Securing flow-rate calibration coefficients and safety limit thresholds in Class II medical infusion pumps subject to regulatory audit. IC Role / Device Role / Timing Role: Tamper-resistant storage element with hardware write lock (WP) and status-register-based protection (BP0/BP1). Use Value: 100,000 write cycles exceed expected service life; >200-year data retention satisfies FDA long-term recordkeeping mandates. |
Use Scenario: Storing tariff schedules, metering constants, and cryptographic keys in ANSI C12.22-compliant smart electricity meters. IC Role / Device Role / Timing Role: Secure, low-power SPI EEPROM accessed during meter boot and periodic firmware validation checks. Use Value: 2.7 V min VCC supports brown-out resilience during grid fluctuations; 3 MHz interface enables rapid key loading during secure boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-WDW6TP | Same 256 Kbit density, 2.5–5.5 V supply, but uses SPI Mode 0 only; 20 MHz max clock; SOIC-8 package | Higher speed suitable for high-throughput data loggers; lacks HOLD pin - no suspend capability | Select when faster read/write throughput is prioritized over transfer suspension during interrupts |
| BR25L256FJ-WE2 | 256 Kbit, 1.7–5.5 V supply, 10 MHz max clock, built-in error correction (ECC), SOIC-8 | ECC support improves reliability in radiation-prone or high-noise environments; no WP/HOLD pins | Choose for mission-critical applications where bit errors must be corrected in real time, not just detected |
Compared with M95256-WDW6TP and BR25L256FJ-WE2, AT25256W-10SC-2.7 offers unique HOLD functionality for deterministic interrupt response and dual-layer (hardware + software) write protection ideal for safety-aware designs, while maintaining broad voltage compatibility and proven industrial qualification.
Availability
AT25256W-10SC-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT25256W-10SC-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 manufacturing continuity for the AT25xxx EEPROM family.
The AT25xxx series was designed specifically for robust, low-power serial configuration storage in resource-constrained embedded systems, emphasizing SPI interoperability, flexible voltage operation, and field-programmable security features.
FAQ
What is the maximum clock frequency supported by the AT25256W-10SC-2.7?
The AT25256W-10SC-2.7 supports a maximum SCK clock frequency of 3 MHz across its full 2.7 V to 5.5 V supply range. This value is specified in the AC Characteristics table under fSCK for VCC = 2.7–5.5 V, with timing validated down to 200 ns minimum SCK high/low times. Exceeding 3 MHz may cause read/write failures or status register misreads.
Does the AT25256W-10SC-2.7 require an external erase cycle before writing?
No, the AT25256W-10SC-2.7 does not require a separate erase cycle. All write operations-including byte and page writes-are self-timed and automatically erase and program the target location internally. A typical write cycle completes in 5 ms, and the device signals readiness via the RDY bit (bit 0) in the status register, accessible using the RDSR instruction.
How does the HOLD pin function during an active SPI transaction on the AT25256W-10SC-2.7?
The HOLD pin on the AT25256W-10SC-2.7 suspends serial communication mid-transaction when driven low while SCK is low. During HOLD, SI inputs are ignored and SO enters high-impedance state, preserving the internal address and instruction state. Communication resumes when HOLD returns high with SCK still low-no reinitialization or CS toggle is needed, enabling deterministic interrupt handling.
Can the AT25256W-10SC-2.7 be used in a 1.8 V system?
No, the AT25256W-10SC-2.7 is rated for 2.7 V to 5.5 V operation only. For 1.8 V systems, Microchip offers the AT25256W-10SC-1.8 variant, which is functionally identical but characterized for 1.8 V to 3.6 V supply. Using AT25256W-10SC-2.7 below 2.7 V risks unreliable read/write behavior and violates absolute maximum ratings.
What protection mechanisms prevent unintended writes to the AT25256W-10SC-2.7?
The AT25256W-10SC-2.7 employs three layered protections: (1) a volatile Write Enable Latch (WEN bit) that must be set via WREN before any write; (2) nonvolatile Block Protection bits (BP0/BP1) to lock memory segments; and (3) hardware write protection via the WP pin when WPEN = 1. All three must be satisfied for a write to succeed-ensuring robust data integrity in noisy or fault-prone environments.
AT25256W-10SC-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:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25256W-10SC-2.7 FAQ
1.How can I place an order for AT25256W-10SC-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256W-10SC-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 AT25256W-10SC-2.7 reliable?
The price and inventory of AT25256W-10SC-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 AT25256W-10SC-2.7 is usually 5 days.
3.What payment methods are accepted for AT25256W-10SC-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256W-10SC-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256W-10SC-2.7?
AT25256W-10SC-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256W-10SC-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 AT25256W-10SC-2.7?
For technical support, including AT25256W-10SC-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256W-10SC-2.7 requirements.
6.How does Aetrix verify that AT25256W-10SC-2.7 is sourced from the original manufacturer or authorized distributors?
All AT25256W-10SC-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 AT25256W-10SC-2.7 meets industry standards.
7.What is the process for return or replacement of AT25256W-10SC-2.7?
All AT25256W-10SC-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT25256W-10SC-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 AT25256W-10SC-2.7 part is unused and in its original packaging.
Return procedure for AT25256W-10SC-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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