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Microchip Technology AT24C256N-10SC-1.8
- Part No.:
- AT24C256N-10SC-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C256N-10SC-1.8.pdf
- Description:
- IC EEPROM 256KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,802
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Product details
Overview
AT24C256N-10SC-1.8 from Microchip Technology (formerly Atmel) is a 256 Kbit (32,768 × 8) I²C-compatible serial EEPROM optimized for ultra-low-voltage embedded systems. It operates from 1.8 V to 3.6 V, supports 100 kHz I²C bus speed at 1.8 V, features hardware write protection via the WP pin, and delivers 100,000 write cycles with 40-year data retention - ideal for battery-powered IoT sensors and portable medical devices.
For engineers reviewing the AT24C256N-10SC-1.8 datasheet, AT24C256N-10SC-1.8 pinout, AT24C256N-10SC-1.8 application, or AT24C256N-10SC-1.8 equivalent, key selection criteria include its 1.8 V operation range, 64-byte page write capability, Schmitt-triggered noise-immune inputs, and compatibility with industrial temperature-grade variants (–40°C to +85°C) in SOIC-8 packaging.
Technical Context
The AT24C256N-10SC-1.8 implements a standard two-wire (I²C) interface with open-drain SDA and active-high SCL, supporting bidirectional data transfer and device addressing via A0/A1 pins. Its internal architecture organizes memory as 512 pages of 64 bytes each, enabling partial-page writes and automatic address incrementing during sequential reads.
It uses a self-timed internal write cycle (tWR ≤ 20 ms), incorporates input filtering and Schmitt-trigger inputs for robust noise immunity, and provides dual-level data protection: hardware write protection via the WP pin and software-controlled lock via I²C command sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits), sufficient for firmware parameter storage or calibration tables in resource-constrained microcontrollers. |
| Supply Voltage Range | 1.8 V to 3.6 V - enables direct interfacing with 1.8 V logic families and low-power MCUs without level shifting. |
| I²C Bus Speed | 100 kHz maximum at 1.8 V - ensures reliable communication in noise-sensitive, low-power applications. |
| Write Endurance | 100,000 write cycles per memory location - supports frequent logging or configuration updates over product lifetime. |
| Data Retention | 40 years at +85°C - guarantees long-term nonvolatile storage integrity in industrial environments. |
| Page Write Size | 64-byte page write mode - reduces write transaction overhead and improves efficiency versus byte-write-only EEPROMs. |
| Standby Current | 0.2 µA typical at 1.8 V - minimizes quiescent power draw in always-on edge nodes. |
Pinout & Package
AT24C256N-10SC-1.8 is supplied in an 8-pin JEDEC-standard SOIC package (8S1), 0.150" wide, with 1.27 mm pitch. Pin 1 is marked by a notch or dot; package dimensions are 4.90 mm × 3.90 mm × 1.75 mm (L × W × H).
| 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. |
| A1 | Device Address Input | Second address bit; used with A0 to enable up to four AT24C256N-10SC-1.8 devices on a shared I²C bus. |
| NC | No Connect | Internally unconnected; must remain unconnected on PCB - no pull-up/down or routing required. |
| GND | Ground Reference | System ground return path for all internal circuitry and I/O; requires low-impedance connection to minimize noise coupling. |
| VCC | Power Supply | Primary 1.8–3.6 V 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 writes; tied to GND enables normal read/write; floating defaults to GND. |
| SCL | Serial Clock Input | Positive-edge clock for I²C data synchronization; requires external pull-up resistor (typically 4.7 kΩ to VCC). |
| SDA | Serial Data I/O | Bidirectional open-drain data line; shares pull-up with SCL; supports multi-master arbitration and clock stretching. |
Key Features
| Feature | Design Value |
|---|---|
| 1.8 V Operation | Enables direct integration into 1.8 V SoC subsystems and energy-harvesting designs without voltage translation. |
| Schmitt-Trigger Inputs | Provides hysteresis on SCL/SDA/A0/A1 to reject high-frequency noise and ensure clean signal sampling in electrically noisy environments. |
| 64-Byte Page Write | Reduces firmware write latency by up to 63× versus byte-wise writes - critical for real-time configuration updates. |
| Hardware Write Protection | WP pin allows board-level locking of EEPROM contents during field operation, preventing accidental or malicious corruption. |
| Industrial Temperature Range | Rated for –40°C to +85°C operation - validated for use in automotive body control modules and industrial PLC I/O expansion cards. |
Applications
| Smart Energy Meters | Wearable Health Monitors |
|---|---|
Use Scenario: Storing tariff schedules, meter calibration constants, and tamper-event logs across 15+ year field deployment. IC Role / Device Role / Timing Role: Nonvolatile configuration and event-history storage with guaranteed data integrity under intermittent power loss. Use Value: 40-year data retention and 100,000 write cycles support lifetime metrology compliance without field replacement. | Use Scenario: Recording sensor calibration offsets, user biometric profiles, and firmware update metadata in compact wearable form factors. IC Role / Device Role / Timing Role: Low-power parameter storage synchronized with BLE MCU sleep/wake cycles via I²C. Use Value: 0.2 µA standby current and 1.8 V operation extend coin-cell battery life beyond 12 months. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: Holding channel-specific gain/offset trims and diagnostic fault history in DIN-rail mounted controllers exposed to EMI and thermal cycling. IC Role / Device Role / Timing Role: Robust configuration storage with Schmitt-triggered I²C interface immune to conducted noise on factory floor wiring. Use Value: ESD protection >4000 V and –40°C to +85°C rating ensure reliability in harsh industrial settings. | Use Scenario: Saving seat position memory, mirror presets, and lighting configuration across vehicle ignition cycles in compact BCM assemblies. IC Role / Device Role / Timing Role: Automotive-grade nonvolatile storage interfaced directly to 1.8 V CAN/LIN gateway MCUs. Use Value: Hardware WP pin prevents unintended writes during ECU reset transients, meeting ISO 16750-2 electrical disturbance 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 M24C256-WMN6TP | Same 256 Kbit size, 1.8–5.5 V range, but rated for 1 MHz max I²C speed at 5 V; standby current 1 µA @ 1.8 V (vs. 0.2 µA for AT24C256N-10SC-1.8). | Higher-speed variant better suited for host MCUs requiring burst reads; less optimal for ultra-low-power sleep modes. | Select M24C256-WMN6TP when system clock budget allows faster I²C and higher standby leakage is acceptable. |
| ON Semiconductor CAT24C256HU4IGT3 | Identical 256 Kbit capacity and 1.8 V min, but offers extended –40°C to +125°C temp grade and 100 kHz I²C at 1.7 V (slightly lower VMIN). | Validated for under-hood automotive use; includes enhanced ESD (6 kV HBM) and AEC-Q100 Grade 1 qualification. | Select CAT24C256HU4IGT3 for engine bay or transmission control applications requiring AEC-Q100 compliance. |
Compared with M24C256-WMN6TP and CAT24C256HU4IGT3, the AT24C256N-10SC-1.8 offers the lowest standby current (0.2 µA) in its class and proven interoperability with legacy Atmel/Microchip ecosystem toolchains, making it optimal for cost-sensitive, battery-operated industrial designs where power efficiency outweighs extreme temperature or speed requirements.
Availability
AT24C256N-10SC-1.8 is available at Aetrix Electronics and suitable for smart metering, wearable health monitoring, industrial PLC I/O modules, automotive body control units, and portable test equipment requiring stable component supply across long production lifecycles.
Supply support for AT24C256N-10SC-1.8 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 a focus on embedded control and connectivity.
The AT24C256N-10SC-1.8 belongs to Microchip's legacy AT24C serial EEPROM product line, designed specifically for low-voltage, low-power, and high-reliability data storage in space-constrained embedded systems.
FAQ
What is the maximum I²C clock frequency supported by AT24C256N-10SC-1.8 at 1.8 V?
The AT24C256N-10SC-1.8 supports a maximum I²C clock frequency of 100 kHz when operating at 1.8 V. This is specified in the AC Characteristics table under the "1.8-volt" column for parameter fSCL. Higher frequencies (up to 400 kHz or 1 MHz) require ≥2.5 V or ≥4.5 V supply, respectively - not applicable to the -1.8 suffix variant.
Does AT24C256N-10SC-1.8 support page write operations, and what is the page size?
Yes, AT24C256N-10SC-1.8 supports 64-byte page write operations. The memory is internally organized into 512 pages of 64 bytes each. Partial-page writes are allowed, and the address counter automatically wraps within the same page if more than 64 bytes are transmitted - a behavior documented in the "Page Write" section of the datasheet.
How does the Write Protect (WP) pin function on AT24C256N-10SC-1.8?
On AT24C256N-10SC-1.8, the WP pin is an active-high hardware lock. When tied to VCC, all write operations (byte and page) are inhibited; when tied to GND, normal read/write is enabled. If left unconnected, an internal pull-down defaults WP to GND, enabling writes - a safety feature confirmed in the Pin Description section.
What is the endurance and data retention specification for AT24C256N-10SC-1.8?
AT24C256N-10SC-1.8 guarantees 100,000 write cycles per memory location and 40 years of data retention at +85°C. These values are explicitly stated in the "High Reliability" feature list and confirmed in the DC Characteristics table under Endurance and Data Retention notes.
Which package type does AT24C256N-10SC-1.8 use, and what are its key mechanical dimensions?
AT24C256N-10SC-1.8 uses an 8-pin JEDEC SOIC package (designated 8S1), 0.150" wide. Its footprint measures 4.90 mm × 3.90 mm, with 1.27 mm lead pitch and 1.75 mm maximum height. These dimensions are verified in the Packaging Information section (page 16) of the datasheet Rev. 0670E–07/01.
AT24C256N-10SC-1.8 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:
- 400 kHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 1.8V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT24C256N-10SC-1.8 FAQ
1.How can I place an order for AT24C256N-10SC-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256N-10SC-1.8 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-1.8 reliable?
The price and inventory of AT24C256N-10SC-1.8 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-1.8 is usually 5 days.
3.What payment methods are accepted for AT24C256N-10SC-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256N-10SC-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256N-10SC-1.8?
AT24C256N-10SC-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256N-10SC-1.8 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-1.8?
For technical support, including AT24C256N-10SC-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256N-10SC-1.8 requirements.
6.How does Aetrix verify that AT24C256N-10SC-1.8 is sourced from the original manufacturer or authorized distributors?
All AT24C256N-10SC-1.8 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-1.8 meets industry standards.
7.What is the process for return or replacement of AT24C256N-10SC-1.8?
All AT24C256N-10SC-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256N-10SC-1.8, 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-1.8 part is unused and in its original packaging.
Return procedure for AT24C256N-10SC-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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