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Microchip Technology AT24C256N-10SI-2.7
- Part No.:
- AT24C256N-10SI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C256N-10SI-2.7.pdf
- Description:
- IC EEPROM 256KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,624
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Product details
Overview
AT24C256N-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 power-meter firmware parameter backup.
For engineers reviewing the AT24C256N-10SI-2.7 datasheet, AT24C256N-10SI-2.7 pinout, AT24C256N-10SI-2.7 application, or AT24C256N-10SI-2.7 equivalent, key selection considerations include its 8-lead SOIC package, 2.7–5.5 V supply range, 64-byte page write capability, and compatibility with standard I²C bus timing at industrial temperature (−40°C to +85°C).
Technical Context
The AT24C256N-10SI-2.7 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, and it uses cascaded device addressing via A0/A1 pins to allow up to four devices on one bus.
Write operations are internally timed (max 5 ms), support byte and 64-byte page writes, and include acknowledge polling for host synchronization. The WP pin enables hardware-level memory lockout, while the NC pin is unconnected and must remain floating or tied to GND per layout guidance.
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 interoperability with legacy and high-speed microcontrollers |
| Write Endurance | 1,000,000 cycles - validated for frequent parameter updates in metering and control systems |
| Data Retention | 40 years at +25°C - guarantees long-term reliability in unattended industrial deployments |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade environments including factory automation and outdoor infrastructure |
| Page Write Buffer | 64 bytes - reduces I²C transaction count for bulk writes, improving system throughput and bus efficiency |
Pinout & Package
AT24C256N-10SI-2.7 is housed in an 8-lead JEDEC-standard SOIC (8S1) package, 0.150" wide, with gull-wing leads and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired low/high to select one of four possible I²C addresses (0x50–0x53); floating defaults to logic low |
| A1 | Device Address Input | Second address bit; used with A0 for multi-device bus configuration; floating defaults to logic low |
| NC | No Connect | Unbonded internal pad; must be left unconnected or tied to GND per layout best practice |
| 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) required 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 sampled clock; Schmitt-triggered for robust operation in noisy industrial environments |
| SDA | Serial Data I/O | Open-drain bidirectional line requiring external pull-up (typically 2.2–10 kΩ to VCC) |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 2.7 V to 5.5 V supply range enables direct integration into 3.3 V and 5 V systems without regulators |
| Hardware write protection | WP pin provides fail-safe memory lockout independent of firmware state - critical for safety-critical parameter storage |
| 64-byte page write mode | Reduces I²C overhead by up to 63× vs. byte writes, accelerating firmware update and calibration data commits |
| Self-timed write cycle | Max 5 ms internal erase/write eliminates need for fixed delay loops - simplifies host firmware timing logic |
| Schmitt-triggered inputs | Enhanced noise immunity on SCL/SDA lines allows reliable operation in electrically harsh industrial settings |
Applications
| Smart Energy Meters | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing tariff schedules, billing registers, and tamper-event logs in electricity/water/gas meters deployed outdoors. IC Role / Device Role / Timing Role: Nonvolatile configuration and event log storage with guaranteed 40-year data retention and 1M write endurance. Use Value: Eliminates battery-backed SRAM; withstands repeated power cycling and temperature extremes without data loss. | Use Scenario: Holding I/O mapping tables, PID tuning parameters, and firmware update staging buffers in programmable logic controllers. IC Role / Device Role / Timing Role: Parameter EEPROM interfaced via I²C to ARM Cortex-M host MCU during boot and runtime reconfiguration. Use Value: Enables field-upgradable control logic without requiring flash reprogramming or external programming tools. |
| Medical Diagnostic Equipment | Automotive Body Control Modules |
Use Scenario: Saving user calibration offsets, sensor gain coefficients, and diagnostic fault history in portable ultrasound and ECG devices. IC Role / Device Role / Timing Role: Calibration data repository accessed during power-on self-test and service mode via I²C. Use Value: Ensures measurement accuracy traceability across device lifetime and regulatory audit cycles. | Use Scenario: Storing seat position presets, mirror angle memories, and lighting configuration profiles in vehicle body domain controllers. IC Role / Device Role / Timing Role: Persistent settings storage accessible over automotive I²C bus during ignition-on initialization. Use Value: Delivers personalized user experience without relying on volatile RAM or complex CAN-based parameter distribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256BN-10SI-2.7 | Same pinout and function; includes process letter 'B' guaranteeing 1M write cycles and extended temp support (−40°C to +125°C) | Required for automotive under-hood or high-temp industrial use cases where extended temperature qualification is mandatory | Select when operating beyond +85°C or requiring documented 1M-cycle endurance across full temp range |
| M24256-BWMN6TP | STMicroelectronics 256 Kbit EEPROM in same 8-lead SOIC package; supports 1 MHz @ 5 V but only 400 kHz @ 2.7 V; no WP pin - write protection is software-only | Lacks hardware write protect; suitable for cost-sensitive consumer applications where firmware-controlled locking suffices | Choose when hardware WP is not required and ST's qualification ecosystem (e.g., AEC-Q100) is preferred |
Compared with AT24C256N-10SI-2.7, the AT24C256BN-10SI-2.7 adds extended temperature and guaranteed endurance validation, while M24256-BWMN6TP trades hardware WP for lower unit cost and ST-specific qualification - making each alternative optimal only under distinct design constraints.
Availability
AT24C256N-10SI-2.7 is available at Aetrix Electronics and suitable for smart energy meters, industrial PLCs, medical diagnostics equipment, and automotive body control modules requiring stable component supply across multi-year production lifecycles.
Supply support for AT24C256N-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 is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with broad industrial and automotive qualifications.
The AT24C256N-10SI-2.7 belongs to Microchip's AT24Cxx family of I²C-compatible serial EEPROMs, designed specifically for reliable, low-power, pin-efficient data storage in space-constrained embedded systems.
FAQ
What is the maximum I²C clock frequency supported by AT24C256N-10SI-2.7?
The AT24C256N-10SI-2.7 supports up to 1 MHz I²C clock frequency when operated at 5.0 V, 400 kHz at 2.7 V, and 100 kHz at 1.8 V. For the AT24C256N-10SI-2.7 specifically (2.7–5.5 V version), the maximum rated speed is 400 kHz at 2.7 V and 1 MHz at 5 V, per AC Characteristics tables in Rev. 0670N.
Does AT24C256N-10SI-2.7 include hardware write protection?
Yes, AT24C256N-10SI-2.7 includes a dedicated Write Protect (WP) pin. When WP is driven high to VCC, all write operations-including byte, page, and write-enable commands-are inhibited. This hardware-level lock operates independently of firmware state and remains active during power transitions.
What package type is used for AT24C256N-10SI-2.7?
AT24C256N-10SI-2.7 uses an 8-lead JEDEC-standard SOIC package (designated 8S1), 0.150" wide, with gull-wing leads and lead-free/halogen-free finish. Pin 1 is marked with a notch or dot, and the package complies with IPC/JEDEC standards for surface-mount assembly.
How many devices can share the same I²C bus with AT24C256N-10SI-2.7?
Up to four AT24C256N-10SI-2.7 devices can share a single I²C bus using hardwired A0 and A1 pins to configure unique 7-bit addresses (0x50–0x53). Each device responds only to its assigned address, enabling scalable memory expansion without additional bus controllers.
What is the write endurance and data retention specification for AT24C256N-10SI-2.7?
AT24C256N-10SI-2.7 is specified for 1,000,000 write cycles and 40 years of data retention at +25°C. These values are validated per JEDEC standards and apply across the full industrial temperature range (−40°C to +85°C), with endurance tested in page-write mode at 25°C.
AT24C256N-10SI-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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
AT24C256N-10SI-2.7 FAQ
1.How can I place an order for AT24C256N-10SI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256N-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 AT24C256N-10SI-2.7 reliable?
The price and inventory of AT24C256N-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 AT24C256N-10SI-2.7 is usually 5 days.
3.What payment methods are accepted for AT24C256N-10SI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256N-10SI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256N-10SI-2.7?
AT24C256N-10SI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256N-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 AT24C256N-10SI-2.7?
For technical support, including AT24C256N-10SI-2.7 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 requirements.
6.How does Aetrix verify that AT24C256N-10SI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT24C256N-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 AT24C256N-10SI-2.7 meets industry standards.
7.What is the process for return or replacement of AT24C256N-10SI-2.7?
All AT24C256N-10SI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256N-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 AT24C256N-10SI-2.7 part is unused and in its original packaging.
Return procedure for AT24C256N-10SI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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