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Microchip Technology AT24C256N-10SU-1.8
- Part No.:
- AT24C256N-10SU-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C256N-10SU-1.8.pdf
- Description:
- IC EEPROM 256KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,450
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Product details
Overview
AT24C256N-10SU-1.8 from Microchip Technology (formerly Atmel) is a 256 Kbit (32,768 × 8) two-wire serial EEPROM optimized for 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 1 million write cycles with 40-year data retention. It is used in industrial sensor calibration storage, medical device configuration memory, and power meter firmware parameter backup.
For engineers reviewing the AT24C256N-10SU-1.8 datasheet, AT24C256N-10SU-1.8 pinout, AT24C256N-10SU-1.8 application, or AT24C256N-10SU-1.8 equivalent, key selection criteria include 1.8 V operation compatibility, 64-byte page write capability, Schmitt-triggered noise-immune inputs, and support for up to four devices on a shared I²C bus using A0/A1 address pins.
Technical Context
The AT24C256N-10SU-1.8 implements a standard two-wire (I²C-compatible) interface with open-drain SDA and edge-triggered SCL, supporting bidirectional data transfer and 9-bit acknowledge protocol. Its internal architecture organizes memory as 512 pages of 64 bytes each, enabling partial-page writes without rollover beyond page boundaries when ≤64 bytes are transmitted.
It uses proprietary internal pull-down biasing on A0, A1, and WP pins to ensure defined logic states when left floating under low-capacitance PCB conditions (<3 pF coupling to VCC). The device enters low-power standby mode automatically after STOP condition receipt and completion of internal operations, drawing only 0.2 µA at 1.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 256 Kbit (32,768 × 8 bits), organized as 512 pages × 64 bytes - enables efficient block-level updates in firmware parameter storage. |
| Supply Voltage Range | 1.8 V to 3.6 V - supports direct interfacing with 1.8 V microcontrollers and ultra-low-power battery-backed systems. |
| I²C Clock Frequency | 100 kHz maximum at 1.8 V - defines minimum SCL period (10 µs) and ensures timing compliance in energy-constrained designs. |
| Write Cycle Time | 5 ms maximum (process-B variant) - determines minimum interval between successive write commands; critical for real-time logging throughput. |
| Endurance & Retention | 1,000,000 write cycles / 40 years data retention - validates suitability for field-updatable calibration tables in industrial equipment. |
| Input Filtering | Schmitt-trigger inputs with noise suppression - eliminates false start/stop detection in electrically noisy environments like motor drives. |
| Standby Current | 0.2 µA at 1.8 V - enables multi-year operation from coin-cell batteries in portable diagnostic tools. |
Pinout & Package
AT24C256N-10SU-1.8 is supplied in an 8-lead SOIC (JEDEC) package (package code "S" per ordering info), 0.150" wide body, RoHS-compliant and halogen-free ("U" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired low/high or left floating (internally pulled down); selects 1 of 4 possible I²C addresses on shared bus. |
| A1 | Device Address Input | Same function as A0; combined with A0, enables up to four AT24C256N-10SU-1.8 devices on one I²C bus. |
| NC | No Connect | Unbonded pin; must remain unconnected - no routing or grounding required on PCB. |
| GND | Ground Reference | System ground return path; requires low-impedance connection to minimize I²C signal noise. |
| VCC | Power Supply | 1.8–3.6 V supply input; bypass capacitor (0.1 µF ceramic) mandatory near pin for stable I²C operation. |
| 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-in; negative-edge clock for data-out - defines I²C timing synchronization point. |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up resistor (typically 10 kΩ @ 1.8 V) to VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional at 1.8 V min - eliminates level-shifting circuitry when interfacing with 1.8 V FPGAs or MCUs. |
| 64-byte page write mode | Enables burst programming of up to 64 bytes per write cycle - reduces firmware update time by >90% vs. byte-by-byte writes. |
| Schmitt-trigger, filtered inputs | Rejects <100 ns noise spikes on SCL/SDA - prevents spurious bus arbitration loss in factory automation PLCs. |
| Hardware + software write protection | WP pin + internal lock bits allow dual-layer data integrity - critical for regulatory-compliant medical device configuration storage. |
| Cascadable I²C addressing | Four-device bus capacity via A0/A1 - simplifies BOM consolidation across multiple sensor nodes in smart grid meters. |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing temperature, pressure, and offset calibration coefficients in field-deployed environmental sensors. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with infrequent writes and frequent reads; retains values across power cycles. Use Value: Enables field recalibration without firmware reflash; 1M endurance supports >10 years of annual recalibration cycles. |
Use Scenario: Holding patient-specific therapy parameters and device serialization data in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration memory with hardware write lock during normal operation. Use Value: WP pin prevents accidental overwrite during runtime; 40-year retention meets FDA long-term traceability requirements. |
| Smart Energy Meter Firmware | Automotive Body Control Module |
Use Scenario: Storing tariff schedules, billing history, and communication module credentials in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: High-reliability data logger memory with periodic timestamped writes and checksum-verified reads. Use Value: 0.2 µA standby current extends battery life to >15 years in AMI endpoint backup power systems. |
Use Scenario: Saving seat position, mirror angle, and lighting preferences in automotive BCMs with 1.8 V CAN/LIN subsystems. IC Role / Device Role / Timing Role: Low-voltage configuration store synchronized to vehicle ignition state transitions. Use Value: Direct 1.8 V compatibility avoids dedicated LDO; page-write mode enables fast user-profile load on door unlock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256B-SSHM-T | Successor generation; same 256 Kbit density, 1.7–5.5 V range, 1 MHz max clock at 5 V, enhanced ESD rating (4 kV HBM). | Approved for extended temperature (–40°C to +125°C); supports higher-speed I²C in automotive under-hood modules. | Select when new design requires extended temp rating, higher ESD robustness, or future-proofing against AT24C256N obsolescence. |
| M24256-BWMN6TP | STMicroelectronics 256 Kbit EEPROM; 1.8–5.5 V, 400 kHz at 1.8 V, 1 M write cycles, identical 8-lead SOIC package. | Qualified to AEC-Q100 Grade 2; includes built-in write-cycle counter and enhanced data polling response. | Select for automotive-grade qualification where AT24C256N-10SU-1.8 lacks formal AEC compliance. |
Compared with AT24C256N-10SU-1.8, the AT24C256B-SSHM-T offers broader voltage tolerance and extended temperature support, while the M24256-BWMN6TP provides automotive qualification and integrated diagnostics - both require no PCB layout changes but differ in qualification scope and timing margins.
Availability
AT24C256N-10SU-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and smart energy meter firmware requiring stable component supply across long production lifecycles.
Supply support for AT24C256N-10SU-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 acquired Atmel in 2016 and maintains full support for legacy Atmel serial EEPROMs including the AT24C256 family.
The AT24C256 product line was designed for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal board space and interface complexity.
FAQ
What is the operating voltage range for AT24C256N-10SU-1.8?
The AT24C256N-10SU-1.8 operates from 1.8 V to 3.6 V. This 1.8 V minimum enables direct integration with modern ultra-low-power microcontrollers and battery-powered systems without level-shifting circuitry. Operation outside this range may cause functional failure or reduced reliability.
Does AT24C256N-10SU-1.8 support I²C standard-mode or fast-mode speeds?
AT24C256N-10SU-1.8 supports up to 100 kHz I²C clock frequency when powered at 1.8 V, which corresponds to standard-mode operation. It does not support fast-mode (400 kHz) or fast-mode plus (1 MHz) at 1.8 V - those speeds require ≥2.5 V supply per datasheet AC characteristics tables.
How many devices can share the same I²C bus with AT24C256N-10SU-1.8?
Up to four AT24C256N-10SU-1.8 devices can share a single I²C bus using hardwired A0 and A1 pins to configure unique 7-bit device addresses. Each device responds only to its assigned address, enabling scalable multi-node memory expansion without additional bus controllers.
What is the purpose of the NC pin on AT24C256N-10SU-1.8?
The NC (No Connect) pin on AT24C256N-10SU-1.8 is internally unbonded and serves no electrical function. It must remain unconnected on the PCB - neither grounded nor routed - to avoid unintended parasitic coupling or mechanical stress on the die bond wire.
Is AT24C256N-10SU-1.8 suitable for new designs?
No - AT24C256N-10SU-1.8 is marked "not recommended for new design" in the official datasheet. Microchip recommends migrating to the AT24C256B series (e.g., AT24C256B-SSHM-T) for new projects due to enhanced specifications, extended temperature support, and active lifecycle management.
AT24C256N-10SU-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT24C256N-10SU-1.8 FAQ
1.How can I place an order for AT24C256N-10SU-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256N-10SU-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-10SU-1.8 reliable?
The price and inventory of AT24C256N-10SU-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-10SU-1.8 is usually 5 days.
3.What payment methods are accepted for AT24C256N-10SU-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256N-10SU-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256N-10SU-1.8?
AT24C256N-10SU-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256N-10SU-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-10SU-1.8?
For technical support, including AT24C256N-10SU-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256N-10SU-1.8 requirements.
6.How does Aetrix verify that AT24C256N-10SU-1.8 is sourced from the original manufacturer or authorized distributors?
All AT24C256N-10SU-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-10SU-1.8 meets industry standards.
7.What is the process for return or replacement of AT24C256N-10SU-1.8?
All AT24C256N-10SU-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256N-10SU-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-10SU-1.8 part is unused and in its original packaging.
Return procedure for AT24C256N-10SU-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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