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Microchip Technology AT24C256N-10SI-2.7-T
- Part No.:
- AT24C256N-10SI-2.7-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C256N-10SI-2.7-T.pdf
- Description:
- IC EEPROM 256KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,818
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Product details
Overview
AT24C256N-10SI-2.7-T 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 bus speed at 5V, features hardware write protection via the 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 power meter firmware parameter backup.
For engineers reviewing the AT24C256N-10SI-2.7-T datasheet, AT24C256N-10SI-2.7-T pinout, AT24C256N-10SI-2.7-T application, or AT24C256N-10SI-2.7-T 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 design continuity.
Technical Context
The AT24C256N-10SI-2.7-T implements a standard two-wire (I²C-compatible) interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. Its internal address counter supports current-address, random-address, and sequential read modes, while page-write capability enables burst writes of up to 64 bytes per cycle.
It uses hardwired A0/A1 pins for device addressing-allowing up to four devices on a shared bus-and integrates an internal pull-down bias on floating address and WP pins when board coupling capacitance is below 3 pF. The device enters low-power standby mode after STOP condition receipt or power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits), organized as 512 pages of 64 bytes each |
| Supply Voltage Range | 2.7 V to 5.5 V - supports direct connection to 3.3 V and 5 V logic rails without level shifting |
| I²C Clock Frequency | Up to 1 MHz at 5 V; 400 kHz at 2.7 V - ensures compatibility with standard and fast-mode I²C controllers |
| Write Cycle Time | Max 5 ms (process "B" devices) - defines minimum interval between successive write commands |
| Endurance | 1,000,000 write cycles - enables reliable use in high-frequency configuration update scenarios |
| Data Retention | 40 years at +25°C - guarantees long-term validity of stored calibration, serial numbers, or settings |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded environments |
| Package | 8-lead JEDEC SOIC (8S1), 150-mil width - compatible with standard surface-mount assembly and reflow profiles |
Pinout & Package
AT24C256N-10SI-2.7-T is housed in an 8-lead JEDEC SOIC (8S1) package: 150-mil body width, gull-wing leads, RoHS-compliant lead finish. Dimensions conform to JEDEC MS-012, Variation AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired low/high to select one of four possible I²C slave addresses (0x50–0x53); floats low if unconnected |
| A1 | Device Address Input | Second address bit; works with A0 to enable multi-device bus topology without external logic |
| NC | No Connect | Internally unused; must remain unconnected - no tie-high/low required |
| GND | Ground Reference | Primary return path for VCC and I/O; requires low-impedance PCB plane for noise immunity |
| VCC | Power Supply | 2.7–5.5 V 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 writes; tied to GND enables full read/write access |
| SCL | Serial Clock Input | Positive-edge clock for data transfer; includes Schmitt trigger and filtering for robust timing in noisy environments |
| SDA | Serial Data I/O | Bidirectional open-drain line requiring external pull-up (1.3 kΩ @ 2.7 V); supports wire-OR with other I²C devices |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte Page Write Mode | Enables efficient bulk programming - reduces I²C transaction overhead by up to 63× vs. byte-write for contiguous data |
| Schmitt Trigger & Filtered Inputs | Rejects fast transients and EMI on SCL/SDA, eliminating need for external RC filtering in industrial layouts |
| Hardware + Software Write Protection | WP pin blocks all writes when high; software lock via address range restriction adds layered security for critical sectors |
| Self-timed Write Cycle | Internal timing eliminates host MCU polling delay - host can issue next command after tWR (5 ms max) expires |
| Extended Temp. Grade Option | This variant (–40°C to +85°C) shares pinout and firmware with extended-range AT24C256N-10SE-2.7 for drop-in qualification upgrades |
Applications
| Industrial Power Metering | Medical Device Calibration Storage |
|---|---|
|
Use Scenario: Storing tariff tables, pulse constants, and firmware revision IDs in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding metrology-critical parameters across power cycles. Use Value: Guarantees 40-year retention of calibration coefficients without battery backup, reducing BOM cost and field failure risk. |
Use Scenario: Saving sensor offset/gain values and user-defined alarm thresholds in portable ultrasound units. IC Role / Device Role / Timing Role: Secure, write-protected memory for FDA-regulated device-specific calibration data. Use Value: WP pin prevents accidental overwrites during field service; 1M-cycle endurance supports frequent recalibration. |
| Automotive Body Control Module | Smart Home Gateway Firmware Settings |
|
Use Scenario: Persisting seat/mirror position presets and lighting profiles in 12 V vehicle systems with LDO-regulated 3.3 V rail. IC Role / Device Role / Timing Role: I²C-configurable NVM interfaced directly to microcontroller's hardware I²C peripheral. Use Value: 2.7–5.5 V operation tolerates automotive load-dump transients; SOIC-8 footprint simplifies layout in space-constrained BCMs. |
Use Scenario: Holding Wi-Fi credentials, OTA update flags, and Zigbee network keys in residential IoT gateways. IC Role / Device Role / Timing Role: Trusted boot-time configuration store accessed before OS initialization. Use Value: Hardware WP prevents remote firmware corruption; 400 kHz I²C speed meets real-time boot requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics M24256-BWMN6TP | Same 256 Kbit density, SOIC-8, 2.5–5.5 V supply; 400 kHz max I²C speed; no 1 MHz mode | Lacks 1 MHz support - unsuitable for high-throughput logging but sufficient for static config storage | Select when cost sensitivity outweighs speed requirement and ST's long-term supply commitment is preferred |
| ON Semiconductor CAT24C256WI-GT3 | Identical 256 Kbit, SOIC-8, 2.5–5.5 V; 1 MHz I²C; 1M write cycles; but no 2.7 V min rating (starts at 2.5 V) | Marginally lower VCC min may cause startup instability in 2.7 V systems near brown-out threshold | Choose for new designs targeting ≥2.5 V rails; verify reset timing margins if migrating from AT24C256N-10SI-2.7-T |
Compared with M24256-BWMN6TP and CAT24C256WI-GT3, the AT24C256N-10SI-2.7-T uniquely guarantees full 1 MHz operation down to 2.7 V and includes factory-trimmed internal pull-downs on A0/A1/WP - reducing external component count in cost-sensitive industrial designs.
Availability
AT24C256N-10SI-2.7-T is available at Aetrix Electronics and suitable for industrial power metering, medical device calibration storage, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for AT24C256N-10SI-2.7-T 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 AT24Cxx EEPROM family.
The AT24C256N-10SI-2.7-T belongs to Microchip's serial EEPROM product line, engineered for robust, low-power nonvolatile storage in resource-constrained embedded systems where reliability and I²C interoperability are critical.
FAQ
What is the maximum I²C clock frequency supported by the AT24C256N-10SI-2.7-T?
The AT24C256N-10SI-2.7-T supports up to 1 MHz I²C clock frequency when operated at 5.0 V. At 2.7 V, the maximum guaranteed speed is 400 kHz. These values are specified in the AC Characteristics table under Industrial Temperature conditions and apply to the "B" process version indicated on the package marking.
Does the AT24C256N-10SI-2.7-T require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C256N-10SI-2.7-T requires external pull-up resistors on both SDA and SCL. The SDA pin is open-drain, and SCL has a Schmitt-trigger input but no internal pull-up. Recommended values are 1.3 kΩ for 2.7 V operation and 1.3 kΩ for 5 V systems, per the AC test conditions in the datasheet.
How many devices can share the same I²C bus using the AT24C256N-10SI-2.7-T?
Up to four AT24C256N-10SI-2.7-T devices can share a single I²C bus using the A0 and A1 address pins. These pins configure the device's 7-bit slave address (0x50–0x53), enabling hardware-based arbitration without software address mapping.
What is the write endurance and data retention specification for the AT24C256N-10SI-2.7-T?
The AT24C256N-10SI-2.7-T guarantees 1,000,000 write cycles and 40 years of data retention at +25°C. These figures apply to process "B" devices (marked on the package) and are validated under standard industrial operating conditions per the datasheet's endurance and retention characterization.
Is the AT24C256N-10SI-2.7-T compatible with 1.8 V I²C systems?
No - the AT24C256N-10SI-2.7-T is rated for 2.7 V to 5.5 V operation only. For 1.8 V systems, the pin-compatible AT24C256N-10SI-1.8 variant must be used, which supports 1.8 V to 3.6 V and operates at up to 100 kHz I²C speed.
AT24C256N-10SI-2.7-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
AT24C256N-10SI-2.7-T FAQ
1.How can I place an order for AT24C256N-10SI-2.7-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256N-10SI-2.7-T 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 AT24C256N-10SI-2.7-T reliable?
The price and inventory of AT24C256N-10SI-2.7-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C256N-10SI-2.7-T is usually 5 days.
3.What payment methods are accepted for AT24C256N-10SI-2.7-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256N-10SI-2.7-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256N-10SI-2.7-T?
AT24C256N-10SI-2.7-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256N-10SI-2.7-T 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 AT24C256N-10SI-2.7-T?
For technical support, including AT24C256N-10SI-2.7-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256N-10SI-2.7-T requirements.
6.How does Aetrix verify that AT24C256N-10SI-2.7-T is sourced from the original manufacturer or authorized distributors?
All AT24C256N-10SI-2.7-T 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 AT24C256N-10SI-2.7-T meets industry standards.
7.What is the process for return or replacement of AT24C256N-10SI-2.7-T?
All AT24C256N-10SI-2.7-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256N-10SI-2.7-T, 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 AT24C256N-10SI-2.7-T part is unused and in its original packaging.
Return procedure for AT24C256N-10SI-2.7-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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