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Microchip Technology AT24C256W-10SU-1.8
- Part No.:
- AT24C256W-10SU-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT24C256W-10SU-1.8.pdf
- Description:
- IC EEPROM 256KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,035
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Product details
Overview
AT24C256W-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 and firmware parameter backup where space-constrained, battery-powered operation is required.
For engineers reviewing the AT24C256W-10SU-1.8 datasheet, AT24C256W-10SU-1.8 pinout, AT24C256W-10SU-1.8 application, or AT24C256W-10SU-1.8 equivalent, key selection factors include its 1.8 V supply compatibility, 8-lead SAP package footprint, 64-byte page write capability, and extended industrial temperature range (–40°C to +85°C) with RoHS-compliant green packaging.
Technical Context
The AT24C256W-10SU-1.8 implements a standard two-wire (I²C-compatible) interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. Its memory is organized as 512 pages of 64 bytes each, enabling efficient partial-page writes without address rollover beyond page boundaries when ≤64 bytes are written per transaction.
Device addressing uses A0 and A1 pins to support up to four devices on a shared bus; both pins are internally pulled down if left floating. The WP pin provides hardware-level write inhibition when driven high, complementing software write protection protocols - critical for safeguarding configuration data during power transitions or firmware updates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 256 Kbit (32,768 × 8), sufficient for storing full device configuration sets or multiple sensor calibration tables in compact systems. |
| Supply Voltage Range | 1.8 V to 3.6 V - enables direct interfacing with 1.8 V logic families and ultra-low-power microcontrollers without level-shifting. |
| I²C Clock Frequency | 100 kHz at 1.8 V - ensures reliable communication in noise-sensitive environments while minimizing dynamic power consumption. |
| Write Cycle Time | Max 5 ms - defines minimum interval between successive write commands; impacts real-time logging latency and firmware update sequencing. |
| Endurance & Retention | 1 million write cycles / 40 years data retention - supports long-life field deployment in industrial monitoring and metering applications. |
| Operating Temperature | –40°C to +85°C - validated for use in uncontrolled ambient environments such as factory-floor controllers and outdoor telemetry units. |
| Package | 8-lead Small Array Package (SAP), 6.00 mm × 4.90 mm - provides compact surface-mount footprint compatible with high-density PCB layouts. |
Pinout & Package
AT24C256W-10SU-1.8 is housed in an 8-lead Small Array Package (SAP), bottom view, with pin 1 marked by an index area. This RoHS-compliant, lead-free package measures 6.00 mm × 4.90 mm and is optimized for automated assembly and thermal performance in industrial-grade assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply | Connects to 1.8 V–3.6 V system rail; decoupling capacitor (0.1 µF) required within 10 mm for stable I²C timing. |
| WP | Write Protect Input | Logic-high disables all write operations; tied to VCC for permanent protection or controlled dynamically for secure firmware updates. |
| SCL | Serial Clock Input | Accepts 100 kHz clock from master; Schmitt-trigger input rejects noise spikes <100 ns, eliminating need for external filtering. |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up (typically 4.7 kΩ to VCC) and supports multi-master arbitration. |
| 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 AT24C256W-10SU-1.8 devices on same I²C segment. |
| NC | No Connect | Not bonded internally; must remain unconnected - no routing or grounding permitted to avoid parasitic coupling. |
| GND | Ground Reference | Primary return path for VCC and I/O; should connect to clean analog/digital ground plane with low-inductance trace. |
Key Features
| Feature | Design Value |
|---|---|
| 1.8 V Operation | Enables direct integration with 1.8 V SoCs and energy-harvesting subsystems without voltage translation overhead. |
| 64-byte Page Write | Reduces write transaction count by >98% vs. byte-write mode, lowering total programming time and I²C bus occupancy. |
| Hardware Write Protection | WP pin allows fail-safe locking of critical configuration blocks during runtime - independent of firmware state or power glitches. |
| Schmitt Trigger Inputs | Eliminates need for external RC filters on SCL/SDA lines, simplifying layout and improving robustness in electrically noisy enclosures. |
| Extended Temp Rating | Validated operation from –40°C to +85°C ensures reliability in industrial control cabinets and outdoor environmental sensors. |
Applications
| Industrial Sensor Calibration Storage | Embedded Firmware Parameter Backup |
|---|---|
Use Scenario: Storing factory-calibrated coefficients and temperature compensation tables for pressure and humidity sensors in HVAC controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent calibration data accessed at boot and updated during field recalibration. Use Value: Enables plug-and-play sensor replacement with zero manual setup; retains accuracy across power cycles and firmware upgrades. | Use Scenario: Preserving user-defined settings (network credentials, display brightness, alarm thresholds) in smart thermostats and programmable logic relays. IC Role / Device Role / Timing Role: Dedicated parameter store isolated from main MCU flash, allowing safe over-the-air updates without risking configuration loss. Use Value: Guarantees settings persistence even during interrupted firmware updates or brown-out events due to its 1.8 V operation margin. |
| Medical Device Configuration Vault | Energy Meter Firmware Patch Log |
Use Scenario: Securing regulatory-mandated device identifiers, calibration history, and audit logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant storage with hardware WP pin enabled during normal operation to prevent accidental overwrite. Use Value: Meets IEC 62304 data integrity requirements by combining hardware lock with 1M-cycle endurance for lifetime logging. | Use Scenario: Recording patch version stamps and rollback checksums in utility-grade electricity meters deployed in remote substations. IC Role / Device Role / Timing Role: Low-power, long-retention log buffer written infrequently but requiring guaranteed write completion before power removal. Use Value: Ensures firmware revision traceability over 15+ year deployments using 40-year data retention and 5 ms max write cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256B-SSHL-T | Same 256 Kbit capacity and 1.8 V operation, but in 8-lead SOIC (8S1) package; rated for extended temp (–40°C to +125°C) with process letter "B". | Preferred for automotive under-hood modules or high-temp industrial PLCs where ambient exceeds +85°C. | Select when extended temperature qualification and JEDEC SOIC compatibility are required over SAP footprint constraints. |
| M24256-BWMN6TP | 256 Kbit, 1.7 V–5.5 V supply, 400 kHz @ 1.7 V; packaged in 8-lead TSSOP (8A2); STMicroelectronics part with enhanced ESD rating (4 kV HBM). | Better suited for mixed-voltage systems (e.g., 3.3 V MCU + 1.8 V sensor rail) and high-ESD environments like factory automation panels. | Choose when broader voltage tolerance, higher ESD immunity, or TSSOP assembly infrastructure already exists. |
Compared with AT24C256W-10SU-1.8, AT24C256B-SSHL-T offers superior high-temperature resilience but larger SOIC footprint, while M24256-BWMN6TP provides wider voltage flexibility and stronger ESD protection at the cost of different package geometry and vendor ecosystem alignment.
Availability
AT24C256W-10SU-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded firmware parameter backup, and medical device configuration vault applications requiring stable component supply across long production lifecycles.
Supply support for AT24C256W-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 is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with a focus on reliability and long-term product support.
The AT24C256W-10SU-1.8 belongs to Microchip's legacy AT24Cxx serial EEPROM family, designed specifically for low-voltage, space-constrained embedded systems needing robust, field-proven nonvolatile storage with minimal external components.
FAQ
What is the maximum I²C clock frequency supported by AT24C256W-10SU-1.8 at 1.8 V?
The AT24C256W-10SU-1.8 supports a maximum I²C clock frequency of 100 kHz when operating at 1.8 V. This is specified in Table 4 (AC Characteristics – Industrial Temperatures) of the datasheet and reflects the trade-off between voltage margin and timing margins for reliable noise-immune communication in low-power systems.
Does AT24C256W-10SU-1.8 support page write operations, and what is the page size?
Yes, AT24C256W-10SU-1.8 supports 64-byte page write operations. The memory is internally organized into 512 pages of 64 bytes each, allowing up to 64 sequential bytes to be written in a single I²C transaction - significantly reducing bus overhead compared to byte-write mode.
What package type is used for AT24C256W-10SU-1.8, and what are its key mechanical dimensions?
AT24C256W-10SU-1.8 uses the 8-lead Small Array Package (SAP), designated as 8Y4. Its body measures 6.00 mm × 4.90 mm with a 1.27 mm lead pitch. Pin 1 is identified by an index area in the bottom-left corner of the package footprint.
How does the Write Protect (WP) pin function on AT24C256W-10SU-1.8?
When the WP pin of AT24C256W-10SU-1.8 is driven high (to VCC), all write operations - including byte, page, and erase - are inhibited. When WP is low or floating (internally pulled down), normal write functionality is enabled. This provides hardware-level security independent of firmware control.
Is AT24C256W-10SU-1.8 suitable for extended temperature applications beyond –40°C to +85°C?
No - AT24C256W-10SU-1.8 is qualified for the industrial temperature range of –40°C to +85°C only. For extended temperature operation up to +125°C, Microchip recommends the AT24C256B-SSHL-T variant, which carries the "B" process marking and is explicitly rated for that range.
AT24C256W-10SU-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm 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
AT24C256W-10SU-1.8 FAQ
1.How can I place an order for AT24C256W-10SU-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256W-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 AT24C256W-10SU-1.8 reliable?
The price and inventory of AT24C256W-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 AT24C256W-10SU-1.8 is usually 5 days.
3.What payment methods are accepted for AT24C256W-10SU-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256W-10SU-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256W-10SU-1.8?
AT24C256W-10SU-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256W-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 AT24C256W-10SU-1.8?
For technical support, including AT24C256W-10SU-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256W-10SU-1.8 requirements.
6.How does Aetrix verify that AT24C256W-10SU-1.8 is sourced from the original manufacturer or authorized distributors?
All AT24C256W-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 AT24C256W-10SU-1.8 meets industry standards.
7.What is the process for return or replacement of AT24C256W-10SU-1.8?
All AT24C256W-10SU-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256W-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 AT24C256W-10SU-1.8 part is unused and in its original packaging.
Return procedure for AT24C256W-10SU-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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