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Microchip Technology AT24C256-10UI-2.7
- Part No.:
- AT24C256-10UI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFBGA
- Datasheet:
-
AT24C256-10UI-2.7.pdf
- Description:
- IC EEPROM 256KBIT I2C 1MHZ 8DBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,335
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Product details
Overview
AT24C256-10UI-2.7 from Microchip Technology (formerly Atmel) is a 256 Kbit (32,768 × 8) two-wire serial EEPROM optimized for low-voltage industrial applications. It operates from 2.7V to 5.5V, supports up to 400 kHz I²C bus speed, features hardware write protection via the WP pin, and delivers 100,000 write cycles with 40-year data retention. It is commonly used in embedded systems for configuration storage, calibration data logging, and firmware parameter backup.
For engineers reviewing the AT24C256-10UI-2.7 datasheet, AT24C256-10UI-2.7 pinout, AT24C256-10UI-2.7 application, or AT24C256-10UI-2.7 equivalent, key selection criteria include industrial temperature range (−40°C to +85°C), 8-pin SOIC package compatibility, 64-byte page write capability, Schmitt-triggered noise-immune inputs, and verified 400 kHz I²C timing at 2.7V.
Technical Context
The AT24C256-10UI-2.7 implements a standard I²C-compatible two-wire interface with open-drain SDA and edge-triggered SCL, supporting multi-master arbitration and bidirectional data transfer. Its internal architecture organizes memory as 512 pages of 64 bytes each, enabling efficient partial-page writes without cross-page rollover.
It uses hardwired A0/A1 address pins to support up to four devices on a shared bus, and integrates an internal pull-down on the WP pin to default to write-enabled operation when unconnected. The device enters low-power standby mode automatically after STOP condition detection and internal write completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits), sufficient for storing full device configuration tables or sensor calibration matrices. |
| Supply Voltage Range | 2.7V to 5.5V - enables direct integration into mixed-voltage industrial control boards without level-shifting. |
| I²C Clock Frequency | Up to 400 kHz at 2.7V - ensures reliable high-speed communication with microcontrollers like ARM Cortex-M or PIC18F. |
| Write Cycle Time | 10 ms max - defines minimum interval between successive write commands; impacts real-time logging latency. |
| Endurance & Retention | 100,000 write cycles / 40 years data retention - meets long-life requirements for field-deployed instrumentation and medical devices. |
| Operating Temperature | −40°C to +85°C - certified for use in industrial automation, automotive body control modules, and outdoor telemetry units. |
| Package | 8-lead JEDEC SOIC (8S2), 0.200" wide - compatible with standard reflow profiles and legacy PCB footprints. |
Pinout & Package
AT24C256-10UI-2.7 is supplied in an 8-lead JEDEC SOIC (EIAJ SOIC, package code 8S2), measuring 5.10 mm × 4.90 mm × 1.75 mm, with gull-wing leads and standard 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired logic input defining LSB of 3-bit device address; enables up to four AT24C256-10UI-2.7 devices on one I²C bus. |
| A1 | Device Address Input | Hardwired logic input defining MSB of 3-bit device address; used with A0 for multi-device addressing. |
| NC | No Connect | Internally unused pin; must remain unconnected per design - no external tie required. |
| GND | Ground Reference | Primary return path for VCC and I/O signals; requires low-impedance connection to system ground plane. |
| VCC | Power Supply | Single supply input (2.7–5.5V); decoupling capacitor (0.1 µF ceramic) recommended within 5 mm. |
| WP | Write Protect Control | Active-high hardware lock: tied to VCC disables all writes; floating defaults to GND (write enabled). |
| SCL | Serial Clock Input | Positive-edge clock for I²C transactions; requires external pull-up resistor (typically 2.2–10 kΩ to VCC). |
| SDA | Serial Data I/O | Bidirectional open-drain data line; shares pull-up with other I²C devices on same bus segment. |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte Page Write Mode | Enables burst programming of contiguous memory without repeated address setup - reduces I²C transaction overhead by ~85% vs. byte writes. |
| Schmitt Trigger Inputs | Provides hysteresis on SCL/SDA/A0/A1 pins - rejects >100 mV of digital noise on noisy industrial PCBs or long traces. |
| Hardware + Software Write Protection | WP pin + internal register lock allows dual-layer security: physical disable during field updates and selective software locking of memory blocks. |
| Self-timed Write Cycle | Internal timing eliminates need for host MCU to poll status - simplifies firmware and avoids bus contention during erase/write operations. |
| ESD Robustness | Rated >4000V HBM - withstands handling and board-level ESD events common in factory assembly and service environments. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data Logging |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory-floor environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via I²C during boot and runtime parameter updates. Use Value: Ensures deterministic startup behavior and retains settings across power loss or firmware upgrades without battery backup. | Use Scenario: Recording sensor offset/gain coefficients and patient-specific therapy parameters in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant data vault with write-protection enforced during clinical operation. Use Value: Meets IEC 62304 Class B software safety requirements through guaranteed data integrity and controlled write access. |
| Automotive Body Control Module (BCM) | Smart Energy Meter Firmware Parameters |
Use Scenario: Holding door lock logic states, mirror position presets, and lighting profiles in 12V automotive BCMs operating across −40°C to +85°C. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfaced directly to 3.3V microcontroller I²C peripheral. Use Value: Eliminates need for external level shifters while maintaining AEC-Q100-relevant reliability metrics (100K cycles, 40-year retention). | Use Scenario: Storing tariff schedules, metering constants, and cryptographic keys in ANSI C12.22-compliant smart electricity meters. IC Role / Device Role / Timing Role: Secure parameter store with hardware WP pin tied to microcontroller GPIO for dynamic lock/unlock control. Use Value: Prevents unauthorized firmware or billing parameter modification during field deployment and utility maintenance. |
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, 2.5–5.5V range, 400 kHz I²C, but rated only to +70°C (commercial temp); no 2.7V-specific speed bin. | Suitable for consumer or lab equipment where extended temperature is not required. | Select if cost sensitivity outweighs industrial temperature compliance and 2.7V timing assurance. |
| ON Semiconductor CAT24C256WI-GT3 | Identical 256 Kbit, 2.7–5.5V, −40°C to +85°C, and 400 kHz spec; differs in WP pin behavior (internally pulled high, not low) and AC timing tolerances. | Requires minor firmware revision to invert WP logic; otherwise drop-in for most designs. | Choose when sourcing diversification is needed and WP polarity can be accommodated in existing driver code. |
Compared with M24C256-WMN6TP and CAT24C256WI-GT3, the AT24C256-10UI-2.7 provides guaranteed 400 kHz operation at 2.7V, industrial-grade temperature margin, and default-write-enabled WP behavior - making it optimal for ruggedized embedded systems where timing predictability and out-of-box compatibility are critical.
Availability
AT24C256-10UI-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT24C256-10UI-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 devices, and nonvolatile memory solutions, with a strong focus on industrial, automotive, and aerospace reliability standards.
The AT24C256-10UI-2.7 belongs to Microchip's legacy AT24C serial EEPROM product line, designed specifically for robust, low-power, I²C-based data storage in space-constrained and thermally demanding embedded applications.
FAQ
What is the maximum I²C clock frequency supported by AT24C256-10UI-2.7 at 2.7V?
The AT24C256-10UI-2.7 supports up to 400 kHz I²C clock frequency when operated at 2.7V, as specified in its AC characteristics table under the "2.7V" voltage option. This is validated across the full industrial temperature range (−40°C to +85°C) and ensures interoperability with standard I²C peripherals without timing margin violations. The AT24C256-10UI-2.7 achieves this using optimized internal clock synchronization and Schmitt-triggered inputs.
Does AT24C256-10UI-2.7 require external pull-up resistors on SDA and SCL lines?
Yes, AT24C256-10UI-2.7 requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and desired rise time. The AT24C256-10UI-2.7 datasheet specifies test conditions using 1.3 kΩ (for 2.5V/5V) and 10 kΩ (for 1.8V), confirming that pull-ups are mandatory for proper I²C bus operation.
How does the WP pin function on AT24C256-10UI-2.7, and what happens when it is left unconnected?
On the AT24C256-10UI-2.7, the WP (Write Protect) pin is active-high: tying it to VCC disables all write operations, while grounding it enables writes. When left unconnected, an internal pull-down circuit biases WP to GND, resulting in default write-enabled behavior. This design allows safe operation without external components unless hardware-level write locking is required - a key differentiator of the AT24C256-10UI-2.7 versus alternatives with internal pull-up WP pins.
Can AT24C256-10UI-2.7 be used in place of AT24C256-10UI without changes to PCB layout or firmware?
Yes, AT24C256-10UI-2.7 is pin-compatible and functionally identical to AT24C256-10UI in package (8S2 SOIC), pinout, and command set. The "-2.7" suffix denotes guaranteed 2.7–5.5V operation and 400 kHz timing at 2.7V - a subset of the broader 4.5–5.5V specification of the base AT24C256-10UI. No PCB or firmware modifications are needed; the AT24C256-10UI-2.7 offers enhanced low-voltage performance within the same mechanical and electrical interface.
What is the endurance rating and data retention period for AT24C256-10UI-2.7?
The AT24C256-10UI-2.7 is rated for 100,000 write/erase cycles and guarantees 40 years of data retention at +85°C ambient temperature. These figures are measured per JEDEC standards and apply across its full operating voltage (2.7–5.5V) and temperature (−40°C to +85°C) range. The AT24C256-10UI-2.7 achieves this via oxide quality control and charge-trapping optimization in its floating-gate EEPROM cell structure.
AT24C256-10UI-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFBGA
- Packaging:
- Tray
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-dBGA (3.81x2.34)
AT24C256-10UI-2.7 FAQ
1.How can I place an order for AT24C256-10UI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256-10UI-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 AT24C256-10UI-2.7 reliable?
The price and inventory of AT24C256-10UI-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 AT24C256-10UI-2.7 is usually 5 days.
3.What payment methods are accepted for AT24C256-10UI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256-10UI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256-10UI-2.7?
AT24C256-10UI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256-10UI-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 AT24C256-10UI-2.7?
For technical support, including AT24C256-10UI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256-10UI-2.7 requirements.
6.How does Aetrix verify that AT24C256-10UI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT24C256-10UI-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 AT24C256-10UI-2.7 meets industry standards.
7.What is the process for return or replacement of AT24C256-10UI-2.7?
All AT24C256-10UI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256-10UI-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 AT24C256-10UI-2.7 part is unused and in its original packaging.
Return procedure for AT24C256-10UI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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