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Microchip Technology AT24C256W-10SI-2.7
- Part No.:
- AT24C256W-10SI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT24C256W-10SI-2.7.pdf
- Description:
- IC EEPROM 256KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,621
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Product details
Overview
AT24C256W-10SI-2.7 from Microchip Technology (formerly Atmel) is a 256 Kbit (32,768 × 8) two-wire serial EEPROM optimized for low-voltage industrial applications. It operates from 2.7V to 5.5V, supports up to 1 MHz I²C clock at 5V, features hardware write protection via WP pin, and delivers 1 million write cycles with 40-year data retention. It is commonly used in embedded system configuration storage, sensor calibration data logging, and firmware parameter backup.
For engineers reviewing the AT24C256W-10SI-2.7 datasheet, AT24C256W-10SI-2.7 pinout, AT24C256W-10SI-2.7 application, or AT24C256W-10SI-2.7 equivalent, this page provides verified electrical specifications, JEDEC SOIC-8 package details, I²C timing compliance (400 kHz @ 2.7V), endurance and retention metrics, and validated alternative parts for industrial temperature-grade serial EEPROM selection.
Technical Context
The AT24C256W-10SI-2.7 implements a standard two-wire (I²C-compatible) interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. It uses internal address latching and auto-incrementing during sequential reads, supporting byte and 64-byte page writes with self-timed internal write cycles.
It features hardwired A0/A1 device addressing pins enabling up to four devices on a shared bus, and a dedicated WP pin that disables all write operations when pulled high to VCC. The device is rated for industrial temperature range (−40°C to +85°C) and supports both standard and low-power standby modes with sub-µA current draw.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits), organized as 512 pages of 64 bytes each - enables efficient block-level updates without full-memory erase. |
| Supply Voltage Range | 2.7V to 5.5V - compatible with 3.3V and 5V logic systems without level shifting. |
| I²C Clock Frequency | Up to 400 kHz at 2.7V, 1 MHz at 5V - ensures interoperability with legacy and modern microcontrollers across voltage grades. |
| Write Endurance | 1,000,000 cycles (at 25°C, page mode) - supports frequent field-updatable configuration storage in industrial controllers. |
| Data Retention | 40 years at 25°C - guarantees long-term reliability for unattended equipment and maintenance-free deployments. |
| Standby Current | 6.0 µA max at 4.5–5.5V - minimizes power budget impact in battery-backed or energy-sensitive applications. |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments including factory automation and outdoor telemetry nodes. |
Pinout & Package
AT24C256W-10SI-2.7 is housed in an 8-lead JEDEC SOIC (8S1) package: 0.150" wide body, gull-wing leads, RoHS-compliant, surface-mountable with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired low/high to configure one of four possible I²C slave addresses (0x50–0x53); floating defaults to logic low via internal bias. |
| A1 | Device Address Input | Second address bit; used with A0 to uniquely identify up to four AT24C256 devices on same I²C bus. |
| NC | No Connect | Unbonded pin; must remain unconnected - no external tie or pull required. |
| GND | Ground Reference | Primary return path for VCC and signal currents; requires low-impedance PCB connection to minimize noise coupling. |
| VCC | Power Supply | 2.7V–5.5V supply input; decoupling capacitor (0.1 µF ceramic) recommended within 5 mm of pin. |
| WP | Write Protect Control | Active-high hardware lock: tied to VCC disables all write/erase operations; tied to GND enables full read/write access. |
| SCL | Serial Clock Input | Positive-edge sampled clock for I²C communication; requires external pull-up resistor (typically 2.2–10 kΩ). |
| SDA | Serial Data I/O | Open-drain bidirectional data line; shares pull-up with SCL; supports multi-master arbitration and clock stretching. |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte Page Write Mode | Enables burst programming of up to 64 bytes per write cycle - reduces total programming time by >90% vs. byte-write for block updates. |
| Schmitt Trigger Inputs | Provides hysteresis on SDA/SCL (typ. 0.3×VCC to 0.7×VCC thresholds) - rejects high-frequency noise and improves robustness in electrically noisy industrial settings. |
| Hardware + Software Write Protection | WP pin blocks all writes when high; software lock bits (if implemented in firmware layer) add configurable granularity - dual-layer security for critical configuration data. |
| Self-timed Write Cycle | Internal 5 ms max write completion (process letter "B" devices) - eliminates need for fixed delay polling; ACK polling confirms readiness. |
| Extended Temp. Grade Support | Qualified for −40°C to +85°C operation (industrial grade) - meets requirements for automotive ECUs, PLCs, and outdoor infrastructure without derating. |
Applications
| Industrial Sensor Calibration Storage | Embedded System Configuration Backup |
|---|---|
|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed via I²C during power-on initialization and field recalibration. Use Value: Enables plug-and-play sensor replacement with zero manual setup; 1M-cycle endurance supports lifetime recalibration in deployed units. |
Use Scenario: Retaining user-configured network settings (IP, subnet, gateway), display brightness, and alarm thresholds in medical monitoring devices. IC Role / Device Role / Timing Role: Persistent configuration register bank updated only on change, read at boot. Use Value: Ensures state continuity across power cycles and firmware updates; 40-year retention prevents data loss in long-lifecycle medical hardware. |
| Firmware Parameter Logging | Smart Meter Tamper-Evident Event Log |
|
Use Scenario: Recording runtime parameters (voltage sags, thermal events, watchdog resets) in HVAC controller firmware for diagnostics. IC Role / Device Role / Timing Role: Circular buffer storage using page-write optimization to minimize wear on frequently updated sectors. Use Value: 64-byte page writes reduce write overhead by 63× vs. byte writes - extends effective endurance beyond 10 years at 100 log entries/day. |
Use Scenario: Storing timestamped tamper-detection events (cover removal, magnetic field exposure) in utility smart meters with legal audit requirements. IC Role / Device Role / Timing Role: Secure, write-protected event journal with WP pin permanently tied to VCC to prevent post-event modification. Use Value: Hardware-enforced immutability of logged events satisfies regulatory chain-of-custody requirements; 1M-cycle rating supports 20+ years of daily logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M24C256-WMN6TP | Same 256 Kbit capacity, 2.7–5.5V, 400 kHz I²C, but in 8-lead TSSOP (8A2); lower profile (1.05 mm max height) vs. SOIC (1.75 mm). | Better suited for space-constrained layouts where board height is limited; identical timing and command set. | Select when footprint compatibility is acceptable and vertical clearance is critical - no schematic change needed. |
| CAT24C256WI-GT3 | Pin-compatible 256 Kbit EEPROM; supports 1 MHz I²C at 2.5–5.5V, but not rated for 2.7V-only operation; extended temp support up to +125°C. | Preferred for high-temperature environments (e.g., under-hood automotive) where AT24C256W-10SI-2.7's +85°C limit is insufficient. | Choose for extended temperature applications requiring >+85°C operation; verify VCC min = 2.5V aligns with system rail. |
Compared with M24C256-WMN6TP and CAT24C256WI-GT3, the AT24C256W-10SI-2.7 offers guaranteed 2.7V minimum operation and industrial-grade qualification in JEDEC SOIC - making it optimal for cost-sensitive, volume industrial designs where 85°C ambient suffices and SOIC assembly infrastructure is established.
Availability
AT24C256W-10SI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration backup, and firmware parameter logging requiring stable component supply and long-term lifecycle assurance.
Supply support for AT24C256W-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 continuity, documentation, and support for the AT24Cxx EEPROM family.
The AT24C256W-10SI-2.7 belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in industrial, automotive, and consumer control systems.
FAQ
What is the maximum I²C clock frequency supported by AT24C256W-10SI-2.7 at 2.7V?
The AT24C256W-10SI-2.7 supports up to 400 kHz I²C clock frequency when operating at 2.7V. This is specified in the AC Characteristics table for industrial temperature range and aligns with standard Fast-mode I²C compliance. At 5.0V, the device supports 1 MHz operation, but voltage scaling must be observed per the DC characteristics table.
Does AT24C256W-10SI-2.7 support page write operations, and what is the page size?
Yes, the AT24C256W-10SI-2.7 supports 64-byte page write operations. The memory is internally organized into 512 pages of 64 bytes each, allowing up to 64 sequential bytes to be written in a single I²C transaction - significantly improving write efficiency over byte-wise programming.
How is write protection implemented on AT24C256W-10SI-2.7?
Write protection on AT24C256W-10SI-2.7 is implemented via the WP (Write Protect) pin: when WP is tied to VCC, all write and erase operations are inhibited; when WP is grounded, full read/write access is enabled. Floating WP defaults to low via internal bias, but Atmel recommends explicit grounding for deterministic behavior.
What is the endurance and data retention specification for AT24C256W-10SI-2.7?
The AT24C256W-10SI-2.7 guarantees 1,000,000 write cycles at 25°C in page mode and 40 years of data retention at 25°C. These values are confirmed for devices bearing the process letter "B" - a marking located in the lower right corner of the package - which applies to the AT24C256W-10SI-2.7 variant.
Which package type does AT24C256W-10SI-2.7 use, and is it RoHS compliant?
AT24C256W-10SI-2.7 uses the 8-lead JEDEC SOIC (8S1) package: 0.150" wide body, gull-wing leads. Per the ordering information table and packaging notes, this variant is lead-free and halogen-free, fully compliant with RoHS Directive 2011/65/EU and JEDEC standards.
AT24C256W-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:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- 550 ns
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT24C256W-10SI-2.7 FAQ
1.How can I place an order for AT24C256W-10SI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256W-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 AT24C256W-10SI-2.7 reliable?
The price and inventory of AT24C256W-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 AT24C256W-10SI-2.7 is usually 5 days.
3.What payment methods are accepted for AT24C256W-10SI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256W-10SI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256W-10SI-2.7?
AT24C256W-10SI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256W-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 AT24C256W-10SI-2.7?
For technical support, including AT24C256W-10SI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256W-10SI-2.7 requirements.
6.How does Aetrix verify that AT24C256W-10SI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT24C256W-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 AT24C256W-10SI-2.7 meets industry standards.
7.What is the process for return or replacement of AT24C256W-10SI-2.7?
All AT24C256W-10SI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256W-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 AT24C256W-10SI-2.7 part is unused and in its original packaging.
Return procedure for AT24C256W-10SI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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