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Microchip Technology AT24C256N-10SC-2.7
- Part No.:
- AT24C256N-10SC-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C256N-10SC-2.7.pdf
- Description:
- IC EEPROM 256KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,298
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Product details
Overview
AT24C256N-10SC-2.7 from Microchip Technology (formerly Atmel) is a 256 Kbit (32,768 × 8) two-wire serial EEPROM optimized for low-voltage embedded systems. It operates across 2.7V–5.5V, supports 400 kHz I²C bus speed, features hardware write protection via WP pin, and delivers 100,000 write cycles with 40-year data retention - used in industrial sensor calibration storage and firmware parameter backup.
For engineers reviewing the AT24C256N-10SC-2.7 datasheet, AT24C256N-10SC-2.7 pinout, AT24C256N-10SC-2.7 application, or AT24C256N-10SC-2.7 equivalent, this page provides verified package mapping (8-pin SOIC), validated 8-pin JEDEC SOIC pinout, confirmed 2.7V–5.5V operation range, real-world endurance and retention specs, and two field-tested alternative parts with documented functional and interface compatibility.
Technical Context
The AT24C256N-10SC-2.7 implements a standard I²C-compatible 2-wire interface with open-drain SDA and edge-triggered SCL, supporting up to four devices on one bus using A0/A1 address inputs. Its internal architecture organizes memory as 512 pages of 64 bytes each, enabling partial-page writes without cross-page rollover.
It uses Schmitt-trigger inputs with noise filtering on SDA/SCL, supports acknowledge polling during write cycles, and incorporates an internal pull-down on the WP pin when left unconnected - ensuring default write-enable behavior unless actively pulled high for hardware data protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits), sufficient for storing full device configuration tables or bootloader parameters in resource-constrained microcontrollers. |
| Supply Voltage Range | 2.7V to 5.5V - enables direct integration with 3.3V logic systems and backward compatibility with legacy 5V designs without level shifting. |
| I²C Bus Speed | 400 kHz maximum - supports fast parameter updates in real-time control loops while maintaining robustness against EMI in industrial environments. |
| Write Endurance | 100,000 write cycles - ensures reliable logging of operational events over multi-year product lifetimes in telemetry or metering applications. |
| Data Retention | 40 years at +25°C - guarantees long-term integrity of calibration coefficients and security keys without battery-backed SRAM. |
| Page Write Capacity | 64-byte page write mode - reduces firmware update time by up to 63× versus byte-write for bulk configuration writes. |
| Write Protect Logic | Hardware-enabled via WP pin tied to VCC - prevents accidental overwrites during power-up transients or software faults. |
Pinout & Package
AT24C256N-10SC-2.7 is packaged in an 8-pin JEDEC-standard SOIC (Small Outline Integrated Circuit), 0.150" wide body, RoHS-compliant, surface-mount package with 1.27 mm pitch.
| 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 per internal bias circuit. |
| A1 | Device Address Input | Second address bit enabling up to four AT24C256N-10SC-2.7 devices on shared I²C bus without address conflict. |
| NC | No Connect | Pin 3 is internally unused and must remain unconnected; no routing or grounding required. |
| GND | Ground Reference | System common return path; must be low-impedance connection to minimize I²C noise coupling and ensure stable logic thresholds. |
| VCC | Power Supply | Primary supply input (2.7V–5.5V); requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm of the pin. |
| WP | Write Protect Control | Active-high enable: tied to VCC disables all writes; tied to GND or left floating enables normal read/write operations. |
| SCL | Serial Clock Input | Positive-edge clock for data-in; negative-edge clock for data-out; requires external pull-up resistor (typically 2.2–10 kΩ). |
| SDA | Serial Data I/O | Bidirectional open-drain line shared across multiple I²C devices; requires same external pull-up as SCL. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation (2.7V–5.5V) | Eliminates need for separate voltage regulators in mixed-supply systems, reducing BOM count and PCB area in portable and IoT edge nodes. |
| 64-byte page write capability | Enables efficient firmware patching or sensor offset table updates with single I²C transaction instead of 64 individual byte writes. |
| Schmitt-trigger filtered inputs | Rejects >100 ns noise spikes on SDA/SCL lines, improving reliability in electrically noisy factory automation or automotive under-hood environments. |
| Hardware + software write protection | WP pin allows permanent lockout of memory regions; combined with software-controlled address masking, enables secure boot partitioning. |
| 100,000 write cycles / 40-year retention | Supports daily calibration logging for >270 years - exceeds typical industrial equipment service life requirements without wear leveling. |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
|
Use Scenario: Storing temperature, pressure, and humidity sensor trim coefficients after factory calibration and field recalibration. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed write integrity during brown-out conditions. Use Value: Eliminates need for external battery-backed RAM; retains calibrated values across 100,000+ power cycles and 40-year shelf life. |
Use Scenario: Holding user-selectable therapy modes, alarm thresholds, and patient history in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store accessed only during initialization or clinician setup. Use Value: WP pin prevents runtime corruption; 400 kHz I²C enables fast setup without delaying critical startup sequences. |
| Automotive Body Control Module | Smart Energy Meter Firmware |
|
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock settings in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Low-power EEPROM interfaced directly to 3.3V MCU I²C peripheral with minimal external components. Use Value: 2.7V minimum operation ensures functionality during cold-crank battery dips to 6V system voltage (3.3V rail remains stable). |
Use Scenario: Storing tariff schedules, demand-response commands, and firmware update flags in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: High-reliability data logger synchronized to metrology IC interrupts for time-stamped event capture. Use Value: 100,000 write cycles support daily billing log entries for >270 years; page write reduces flash wear on host MCU. |
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 256Kbit size, 2.5V–5.5V range, 400 kHz I²C, 8-pin SOIC package; differs in standby current (1 µA vs. 0.5 µA @ 2.7V) and write cycle time (10 ms max vs. 10 ms typical). | Identical use in industrial controllers; slightly higher ISB may impact ultra-low-power battery designs requiring sub-µA sleep states. | Select M24256-BWMN6TP when sourcing from ST-authorized channels is preferred or when qualifying alternate suppliers for dual-sourcing. |
| ON Semiconductor CAT24C256WI-GT3 | 256Kbit, 1.7V–5.5V range, 400 kHz I²C, 8-pin SOIC; differs in WP pin behavior (internal pull-up vs. AT24C256N-10SC-2.7's internal pull-down) and AC timing (tHD.STA min = 0.6 µs vs. 4.0 µs). | Compatible in most 3.3V systems but requires WP pin tie-off to GND for write-enable - opposite default behavior to AT24C256N-10SC-2.7. | Choose CAT24C256WI-GT3 for extended low-voltage operation down to 1.7V or when leveraging ON Semi's automotive-qualified variants (AEC-Q100 Grade 1). |
Compared with AT24C256N-10SC-2.7, M24256-BWMN6TP offers tighter supply range alignment and identical pinout but higher standby current, while CAT24C256WI-GT3 extends voltage range downward and changes WP default logic - both require validation of WP handling and timing margins in new designs.
Availability
AT24C256N-10SC-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT24C256N-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 technical and manufacturing continuity for the AT24Cxx EEPROM family, delivering high-reliability nonvolatile memory solutions since 1980.
The AT24C256N-10SC-2.7 belongs to Microchip's serial EEPROM product line, designed specifically for space-constrained, low-power embedded systems needing robust, pin-compatible memory expansion with I²C simplicity.
FAQ
What is the operating voltage range for AT24C256N-10SC-2.7?
The AT24C256N-10SC-2.7 operates from 2.7V to 5.5V DC, making it compatible with both modern 3.3V microcontroller systems and legacy 5V designs. This range is explicitly defined in the "-2.7" suffix of the part number and confirmed in the Absolute Maximum Ratings and DC Characteristics sections of the official datasheet (Rev. 0670E).
Does AT24C256N-10SC-2.7 support page writes, and what is the page size?
Yes, AT24C256N-10SC-2.7 supports 64-byte page writes, allowing up to 64 sequential bytes to be written in a single I²C transaction. This capability is documented in the "Write Operations" section and significantly improves write efficiency compared to byte-wise programming - especially critical in firmware update or calibration logging scenarios.
How does the Write Protect (WP) pin function on AT24C256N-10SC-2.7?
When WP is tied to VCC, all write operations to AT24C256N-10SC-2.7 are inhibited; when tied to GND or left floating, writes are enabled. The device includes an internal pull-down on WP, so unconnected operation defaults to write-enable - a key design detail confirmed in the Pin Description and Device Operation sections of the datasheet.
What is the maximum I²C clock frequency supported by AT24C256N-10SC-2.7?
AT24C256N-10SC-2.7 supports up to 400 kHz I²C communication at 2.7V–5.5V supply, as specified in the AC Characteristics table. This is lower than the 1 MHz rating of the 5V-only variant but ensures timing margin compliance across the full low-voltage operating range.
Is AT24C256N-10SC-2.7 pin-compatible with other AT24C256 variants?
Yes, AT24C256N-10SC-2.7 shares identical 8-pin SOIC (8S1) pinout and signal definitions with all AT24C256 variants in the same package type - including AT24C256-10SC, AT24C256W-10SC-2.7, and AT24C256N-10SI-2.7 - enabling drop-in replacement where voltage and temperature requirements align.
AT24C256N-10SC-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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT24C256N-10SC-2.7 FAQ
1.How can I place an order for AT24C256N-10SC-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256N-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 AT24C256N-10SC-2.7 reliable?
The price and inventory of AT24C256N-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 AT24C256N-10SC-2.7 is usually 5 days.
3.What payment methods are accepted for AT24C256N-10SC-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256N-10SC-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256N-10SC-2.7?
AT24C256N-10SC-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256N-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 AT24C256N-10SC-2.7?
For technical support, including AT24C256N-10SC-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256N-10SC-2.7 requirements.
6.How does Aetrix verify that AT24C256N-10SC-2.7 is sourced from the original manufacturer or authorized distributors?
All AT24C256N-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 AT24C256N-10SC-2.7 meets industry standards.
7.What is the process for return or replacement of AT24C256N-10SC-2.7?
All AT24C256N-10SC-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256N-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 AT24C256N-10SC-2.7 part is unused and in its original packaging.
Return procedure for AT24C256N-10SC-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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