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Microchip Technology AT24C256W-10SC-2.7
- Part No.:
- AT24C256W-10SC-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT24C256W-10SC-2.7.pdf
- Description:
- IC EEPROM 256KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,769
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Product details
Overview
AT24C256W-10SC-2.7 from Microchip Technology (formerly Atmel) is a 256 Kbit (32,768 × 8) two-wire serial EEPROM operating from 2.7V to 5.5V, featuring 64-byte page write capability, 100,000 write cycles endurance, and 40-year data retention. It integrates Schmitt-trigger inputs for noise immunity and supports up to 4 devices on a shared I²C bus in industrial temperature range (−40°C to +85°C), used in embedded system configuration storage and firmware parameter backup.
For engineers reviewing the AT24C256W-10SC-2.7 datasheet, AT24C256W-10SC-2.7 pinout, AT24C256W-10SC-2.7 application, or AT24C256W-10SC-2.7 equivalent, key selection factors include its 2.7V–5.5V supply range, 400 kHz I²C speed at 2.7V, hardware write protect (WP) pin, 8-pin SOIC package, and compatibility with standard 2-wire serial protocols in space-constrained industrial designs.
Technical Context
The AT24C256W-10SC-2.7 implements a standard I²C-compatible two-wire interface with open-drain SDA and edge-triggered SCL, supporting byte and 64-byte page writes with self-timed internal write cycles (max 10 ms). Its address decoding uses A0/A1 pins to support up to four devices per bus, with NC pins configured per package variant.
It features hardware write protection via the WP pin-tied high to VCC to inhibit all writes-and includes Schmitt-triggered, filtered inputs for robust operation in electrically noisy environments. The device maintains a 14-bit internal address counter for sequential reads and supports current-address, random-address, and sequential read modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits), enabling storage of large configuration tables or calibration data in microcontroller-based systems |
| Supply Voltage Range | 2.7V to 5.5V - supports mixed-voltage designs and brown-out tolerant operation without level shifters |
| I²C Clock Frequency | Up to 400 kHz at 2.7V - ensures reliable communication with legacy and low-power microcontrollers |
| Write Endurance | 100,000 write cycles - sufficient for frequent parameter updates in field-deployed equipment |
| Data Retention | 40 years at +85°C - guarantees long-term integrity of stored settings across product lifecycle |
| Page Write Size | 64 bytes - reduces I²C transaction overhead and improves bulk write efficiency vs. byte-by-byte writes |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade applications including automation and metering |
Pinout & Package
AT24C256W-10SC-2.7 is supplied in an 8-pin JEDEC SOIC (8S2) package, 0.200" wide, with gull-wing leads and standard 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); floats low if unconnected |
| A1 | Device Address Input | Second address bit; enables multi-device bus topology without external logic |
| NC | No Connect | Internally unused; must be left floating or tied to GND per layout guidelines |
| GND | Ground Reference | Return path for VCC and signal currents; requires low-impedance PCB plane connection |
| VCC | Power Supply | Primary power input (2.7–5.5V); decoupling capacitor (0.1 µF) required within 1 cm |
| WP | Write Protect Control | Active-high hardware lock: tie to VCC to disable all writes; internally pulled down when open |
| SCL | Serial Clock Input | Positive-edge sampled clock for I²C synchronization; requires external pull-up resistor (typically 4.7 kΩ) |
| SDA | Serial Data I/O | Open-drain bidirectional bus line; shares pull-up with other I²C devices on same segment |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional at 2.7V min - eliminates need for voltage regulators in battery-powered or energy-harvesting systems |
| Hardware write protection | Dedicated WP pin with internal pull-down - prevents accidental overwrites during power transitions or firmware glitches |
| Noise-immune inputs | Schmitt-trigger + filtering on SCL/SDA - suppresses EMI-induced false starts/stops in motor drives or RF-dense enclosures |
| Page write mode | 64-byte burst writes - cuts I²C bus occupancy by >90% vs. 32K individual byte writes |
| Cascadable bus architecture | Supports up to 4 devices on one I²C bus using A0/A1 - simplifies BOM and routing in multi-peripheral systems |
Applications
| Industrial PLC Configuration Storage | Smart Meter Firmware Parameter Backup |
|---|---|
Use Scenario: Storing calibrated sensor offsets, communication settings, and operational thresholds in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via I²C during boot and runtime reconfiguration. Use Value: Ensures deterministic startup behavior after power loss and enables field-updatable calibration without firmware reflashing. | Use Scenario: Retaining tariff schedules, billing counters, and cryptographic keys in utility smart meters operating continuously for 15+ years. IC Role / Device Role / Timing Role: Secure, long-life parameter storage with hardware write lock to prevent tampering. Use Value: Meets ANSI C12.22 and IEC 62056 requirements for data integrity and 40-year retention under thermal stress. |
| Medical Device Calibration Data Archive | Automotive Body Control Module Settings |
Use Scenario: Saving factory-calibrated ADC gain/offset values and user-adjusted therapy parameters in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant EEPROM interfaced to ARM Cortex-M microcontroller via I²C. Use Value: Maintains traceable calibration history across device lifetime and satisfies FDA 21 CFR Part 11 audit requirements. | Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in automotive BCMs exposed to −40°C to +105°C ambient. IC Role / Device Role / Timing Role: Industrial-temp EEPROM with WP pin tied to MCU-controlled GPIO for secure settings update. Use Value: Survives automotive thermal cycling while enabling OEM personalization without reprogramming main MCU flash. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M24256-BWMN6TP | Same 256 Kbit size and 2.7–5.5V range, but uses 8-pin SOIC (MN) with different pinout: WP and NC swapped; no internal WP pull-down | Requires PCB layout revision due to pin swap; lacks default-safe WP behavior when unconnected | Select only if redesigning board and validating WP control logic; not drop-in compatible |
| BR24G256FJ-WE2 | 256 Kbit, 1.7–5.5V range, 1 MHz I²C at 5V, but rated only to +105°C (not −40°C); WP pin active-low | Not suitable for extended industrial temp range; requires inverted WP drive and tighter VCC tolerance below 1.8V | Prefer for consumer-grade designs needing higher speed; avoid where −40°C operation or hardware WP default is mandatory |
Compared with M24256-BWMN6TP and BR24G256FJ-WE2, the AT24C256W-10SC-2.7 provides guaranteed −40°C start-up, internal WP pull-down for fail-safe defaults, and pinout alignment with legacy Atmel designs-making it optimal for industrial retrofit and long-lifecycle programs.
Availability
AT24C256W-10SC-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, smart meters, medical diagnostics, and automotive body control modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for AT24C256W-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 is a global semiconductor company specializing in microcontrollers, analog, FPGA, and memory solutions, with broad industrial and automotive qualification programs.
The AT24C256W-10SC-2.7 belongs to Microchip's legacy Atmel serial EEPROM family, engineered for robust, low-power nonvolatile data storage in harsh environments where reliability and long-term data integrity are critical.
FAQ
What is the maximum I²C clock frequency supported by AT24C256W-10SC-2.7 at 2.7V?
The AT24C256W-10SC-2.7 supports up to 400 kHz I²C clock frequency when operated at 2.7V. This is specified in the AC Characteristics table under "2.5-volt" column (which covers 2.7V operation), with tLOW and tHIGH timing constraints validated for reliable communication in industrial noise environments.
Does AT24C256W-10SC-2.7 have internal pull-down on the WP pin?
Yes, the AT24C256W-10SC-2.7 includes an internal pull-down on the WP pin. When left unconnected, WP defaults to logic low, enabling normal write operations. This fail-safe behavior prevents accidental write lockout during power-up or floating conditions, a key reliability feature confirmed in the Pin Description section.
What package type is used for AT24C256W-10SC-2.7?
The AT24C256W-10SC-2.7 uses an 8-pin EIAJ SOIC package (designated 8S2), 0.200" wide, with gull-wing leads and 1.27 mm pitch. This is explicitly stated in the AT24C256 Ordering Information table and verified in the Packaging Information diagrams on page 17.
Can AT24C256W-10SC-2.7 operate down to 1.8V?
No, AT24C256W-10SC-2.7 is rated for 2.7V to 5.5V operation only. The "-2.7" suffix denotes the 2.7V minimum supply option. For 1.8V operation, the correct part is AT24C256W-10SC-1.8, which has different AC timing (100 kHz max) and DC characteristics.
How many devices can share the same I²C bus with AT24C256W-10SC-2.7?
Up to four AT24C256W-10SC-2.7 devices can share a single I²C bus using the A0 and A1 address pins. Each pin can be hardwired high or low, yielding four unique 7-bit device addresses (0x50–0x53), as defined in the Device Addressing section and confirmed in the Pin Configurations diagram.
AT24C256W-10SC-2.7 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:
- 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
AT24C256W-10SC-2.7 FAQ
1.How can I place an order for AT24C256W-10SC-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256W-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 AT24C256W-10SC-2.7 reliable?
The price and inventory of AT24C256W-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 AT24C256W-10SC-2.7 is usually 5 days.
3.What payment methods are accepted for AT24C256W-10SC-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256W-10SC-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256W-10SC-2.7?
AT24C256W-10SC-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256W-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 AT24C256W-10SC-2.7?
For technical support, including AT24C256W-10SC-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256W-10SC-2.7 requirements.
6.How does Aetrix verify that AT24C256W-10SC-2.7 is sourced from the original manufacturer or authorized distributors?
All AT24C256W-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 AT24C256W-10SC-2.7 meets industry standards.
7.What is the process for return or replacement of AT24C256W-10SC-2.7?
All AT24C256W-10SC-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256W-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 AT24C256W-10SC-2.7 part is unused and in its original packaging.
Return procedure for AT24C256W-10SC-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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