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Microchip Technology AT24C256N-10SI-1.8
- Part No.:
- AT24C256N-10SI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C256N-10SI-1.8.pdf
- Description:
- IC EEPROM 256KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,705
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Product details
Overview
AT24C256N-10SI-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 clocking 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 commonly used in industrial sensor calibration storage and portable medical device configuration memory.
For engineers reviewing the AT24C256N-10SI-1.8 datasheet, AT24C256N-10SI-1.8 pinout, AT24C256N-10SI-1.8 application, or AT24C256N-10SI-1.8 equivalent, this page provides verified electrical parameters, JEDEC SOIC-8 package details, noise-suppressed Schmitt-trigger inputs, 64-byte page write capability, and validated alternatives for low-voltage EEPROM replacement.
Technical Context
The AT24C256N-10SI-1.8 implements a standard two-wire (I²C) interface with open-drain SDA and active-high SCL, supporting bidirectional data transfer under strict timing constraints: tSU.DAT = 100 ns, tHD.DAT = 0 ns, and tWR = 5 ms max for devices marked with process letter "B". Its internal address counter enables current-address, random-address, and sequential read modes without external addressing logic.
Memory organization is fixed at 32,768 words × 8 bits, segmented into 512 pages of 64 bytes each. Device addressing uses A0/A1 pins to support up to four devices on a shared bus, while the WP pin provides hardware-level write inhibition when tied to VCC - a feature confirmed for all 1.8 V variants including AT24C256N-10SI-1.8.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8), enabling storage of firmware patches or device-specific calibration tables in space-constrained designs |
| Supply Voltage Range | 1.8 V to 3.6 V - compatible with modern ultra-low-power microcontrollers and battery-backed systems |
| I²C Clock Frequency | 100 kHz at 1.8 V - ensures reliable communication in noise-sensitive, low-energy applications |
| Write Endurance | 1,000,000 cycles (for process-letter-B devices) - supports frequent field-updatable parameter logging |
| Data Retention | 40 years at +85°C - guarantees long-term integrity of stored configuration data without refresh |
| Page Write Capacity | 64-byte page writes with partial-page support - reduces transaction overhead during bulk configuration updates |
| Standby Current | 0.2 µA at 1.8 V - minimizes quiescent power draw in always-on IoT edge nodes |
Pinout & Package
AT24C256N-10SI-1.8 is supplied in an 8-lead JEDEC SOIC (8S1) package: 0.150" wide body, gull-wing leads, RoHS-compliant, with 1.27 mm lead pitch and 5.0 mm × 6.2 mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired low/high or left floating (internally pulled down); selects one of four possible I²C addresses on shared bus |
| A1 | Device Address Input | Same function as A0; combined with A0, enables up to four AT24C256N-10SI-1.8 devices per I²C segment |
| NC | No Connect | Unbonded die pad; must remain unconnected to avoid signal coupling or ESD risk |
| GND | Ground Reference | Primary return path for VCC and I/O; requires low-impedance PCB plane connection for noise immunity |
| VCC | Power Supply | Accepts 1.8–3.6 V only; decoupling capacitor (0.1 µF) required within 5 mm of pin for stable I²C operation |
| WP | Write Protect Control | Active-high inhibit: tie to VCC to block all writes; tie to GND to enable full read/write access |
| SCL | Serial Clock Input | Positive-edge sampled input; requires external pull-up; defines timing for all I²C transactions |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up; shares bus with other I²C devices via wire-OR |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger, filtered inputs | Rejects high-frequency noise on SCL/SDA lines - eliminates false start/stop detection in electrically noisy industrial environments |
| Self-timed 5 ms write cycle | Eliminates need for external write-cycle delay timers; microcontroller can poll ACK to detect completion |
| Hardware + software write protection | WP pin blocks writes physically; software lock bits (if supported by variant) add layered security for critical configuration data |
| Extended temperature range | Rated for −40°C to +85°C operation - suitable for deployment in outdoor metering and automotive cabin modules |
| Lead-free/halogen-free packaging | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profiles - supports automated assembly and green manufacturing |
Applications
| Industrial Sensor Calibration | Portable Medical Device Settings |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and temperature compensation tables for analog sensor front-ends. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent calibration data accessed at power-up by MCU ADC driver. Use Value: Enables single-point calibration across production batches without firmware modification; 40-year retention ensures accuracy over product lifetime. |
Use Scenario: Saving user-selected therapy parameters (e.g., dose rate, alarm thresholds) in battery-powered insulin pumps or pulse oximeters. IC Role / Device Role / Timing Role: Low-power configuration store accessed infrequently but requiring guaranteed write integrity during brown-out events. Use Value: 0.2 µA standby current extends battery life; 1.8 V operation allows direct interface with coin-cell–powered MCUs without voltage boosting. |
| Smart Energy Meter Firmware Patch Storage | Automotive Body Control Module NVM |
Use Scenario: Holding small firmware patches or regulatory compliance updates downloaded over PLC or RF link in utility meters. IC Role / Device Role / Timing Role: Secure update staging area where new code is validated before copying to main flash - isolated from runtime execution. Use Value: 64-byte page writes minimize I²C transaction count during patch ingestion; WP pin prevents accidental overwrite during field updates. |
Use Scenario: Storing vehicle-specific configuration (e.g., mirror fold settings, seat position presets) in BCMs with limited MCU internal NVM. IC Role / Device Role / Timing Role: Secondary nonvolatile memory mapped via I²C for user preference persistence across ignition cycles. Use Value: −40°C to +85°C rating ensures reliability in under-hood thermal cycling; 1 million endurance supports daily reconfiguration over 10+ year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M24C256-RMN6TP | 256 Kbit, 1.7–5.5 V supply, 400 kHz @ 1.8 V, SOIC-8, same pinout, but no process-letter-B endurance guarantee (100k cycles typical) | Lacks documented 1M-cycle endurance at 1.8 V; suitable for less frequent write scenarios | Select if cost sensitivity outweighs long-term write-cycle requirements and ambient temperature stays ≤ +70°C |
| BR24G256FJ-WE2 | 256 Kbit, 1.6–5.5 V, 1 MHz @ 1.8 V, TSSOP-8, built-in error correction (ECC), 1M cycles, but different pinout (VCC/SDA/SCL/GND on corners) | Requires PCB layout change; ECC adds robustness for safety-critical storage but increases firmware complexity | Choose when system-level data integrity is mandated (e.g., ISO 26262 ASIL-B) and board revision is feasible |
Compared with M24C256-RMN6TP and BR24G256FJ-WE2, the AT24C256N-10SI-1.8 offers guaranteed 1-million-cycle endurance at 1.8 V with JEDEC SOIC-8 compatibility and zero-layout-change migration from legacy AT24C series - making it optimal for industrial upgrades where reliability and drop-in fit are prioritized over speed or ECC.
Availability
AT24C256N-10SI-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, portable medical device settings, smart energy meter firmware patch storage, and automotive body control module NVM requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT24C256N-10SI-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 technical and manufacturing continuity for the AT24C family of serial EEPROMs.
The AT24C256N-10SI-1.8 belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-voltage, low-power, and high-reliability nonvolatile data storage in industrial, medical, and automotive applications.
FAQ
What is the maximum I²C clock frequency supported by AT24C256N-10SI-1.8 at 1.8 V?
The AT24C256N-10SI-1.8 supports up to 100 kHz I²C clock frequency when operating at 1.8 V, as specified in the AC Characteristics table for 1.8-volt operation. This limit ensures timing margin for rise/fall times and bus capacitance in low-voltage systems. Higher frequencies (e.g., 400 kHz) require ≥2.5 V supply and are not valid for AT24C256N-10SI-1.8.
Does AT24C256N-10SI-1.8 support page write operations, and what is the maximum page size?
Yes, AT24C256N-10SI-1.8 supports page write mode with a maximum page size of 64 bytes. The device allows partial page writes - meaning fewer than 64 bytes can be written in a single transaction - and automatically increments the lower 6 bits of the address internally. This capability reduces I²C overhead during configuration updates.
How does the Write Protect (WP) pin function on AT24C256N-10SI-1.8?
On AT24C256N-10SI-1.8, the WP pin is active-high: when tied to VCC, all write operations (byte and page) are inhibited; when tied to GND, full read/write access is enabled. If left floating, the pin is internally pulled down - enabling writes - but Microchip recommends hardwiring WP to GND or VCC for deterministic behavior in production designs.
Is AT24C256N-10SI-1.8 qualified for extended temperature operation (−40°C to +125°C)?
No, AT24C256N-10SI-1.8 is rated for industrial temperature range only (−40°C to +85°C). For extended temperature operation up to +125°C, Microchip offers the AT24C256N-10SE-2.7 variant (2.7–5.5 V supply), which carries the process letter "B" and is explicitly approved for −40°C to +125°C per the datasheet's Absolute Maximum Ratings and Ordering Information tables.
What package type is used for AT24C256N-10SI-1.8, and is it RoHS-compliant?
AT24C256N-10SI-1.8 uses the 8-lead JEDEC SOIC (8S1) package: 0.150" wide body, gull-wing leads, 1.27 mm pitch. Per the Ordering Information table and Packaging Information section, this variant is lead-free and halogen-free, fully compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow standards.
AT24C256N-10SI-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-10SI-1.8 FAQ
1.How can I place an order for AT24C256N-10SI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256N-10SI-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-10SI-1.8 reliable?
The price and inventory of AT24C256N-10SI-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-10SI-1.8 is usually 5 days.
3.What payment methods are accepted for AT24C256N-10SI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256N-10SI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256N-10SI-1.8?
AT24C256N-10SI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256N-10SI-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-10SI-1.8?
For technical support, including AT24C256N-10SI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256N-10SI-1.8 requirements.
6.How does Aetrix verify that AT24C256N-10SI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT24C256N-10SI-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-10SI-1.8 meets industry standards.
7.What is the process for return or replacement of AT24C256N-10SI-1.8?
All AT24C256N-10SI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256N-10SI-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-10SI-1.8 part is unused and in its original packaging.
Return procedure for AT24C256N-10SI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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