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Microchip Technology AT24C256N-10SU-2.7
- Part No.:
- AT24C256N-10SU-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C256N-10SU-2.7.pdf
- Description:
- IC EEPROM 256KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,407
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Product details
Overview
AT24C256N-10SU-2.7 from Microchip Technology (formerly Atmel) is a 256 Kbit (32,768 × 8) two-wire serial EEPROM with 2.7V to 5.5V supply operation, 64-byte page write capability, and hardware write protection via the WP pin. It supports up to 1 MHz I²C bus speed at 5V and delivers 1 million write cycles with 40-year data retention - used in industrial control modules for configuration storage and calibration parameter backup.
For engineers reviewing the AT24C256N-10SU-2.7 datasheet, AT24C256N-10SU-2.7 pinout, AT24C256N-10SU-2.7 application, or AT24C256N-10SU-2.7 equivalent, key selection considerations include its 8-lead SOIC package, 2.7–5.5 V operating range, 400 kHz bus compatibility at 2.7 V, Schmitt-trigger noise-immune inputs, and cascading support for up to four devices on one I²C bus.
Technical Context
The AT24C256N-10SU-2.7 implements a standard two-wire (I²C-compatible) interface with open-drain SDA and active-high SCL, supporting byte and 64-byte page writes. Its internal address counter enables current-address and random-address read modes, with acknowledge polling for write-cycle completion detection.
It uses hardwired A0/A1 pins for device addressing (up to 4 devices per bus), features an internally pulled-down WP pin when floating, and incorporates Schmitt-trigger inputs with filtered logic thresholds to suppress EMI-induced glitches on noisy industrial PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits), organized as 512 pages of 64 bytes - enables efficient firmware parameter logging without external memory management. |
| Supply Voltage | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V microcontroller systems without level-shifting. |
| Write Cycle Time | Max 5 ms (for process-B variants) - defines minimum interval between successive write commands; impacts real-time logging latency. |
| I²C Clock Frequency | Up to 1 MHz at 5 V, 400 kHz at 2.7 V - determines maximum throughput: ~40 KB/s theoretical burst rate at full speed. |
| Endurance & Retention | 1,000,000 write cycles and 40 years data retention at 25°C - qualifies for long-life industrial deployments with frequent recalibration updates. |
| Operating Temperature | –40°C to +85°C - validated for use in uncontrolled ambient environments such as factory-floor HMIs and power metering units. |
| Input Capacitance | SDA: 8 pF, A0/A1/SCL: 6 pF - constrains maximum I²C bus length and pull-up resistor selection for reliable timing compliance. |
Pinout & Package
AT24C256N-10SU-2.7 is supplied in an 8-lead JEDEC SOIC (8S1) package: 0.150" wide body, gull-wing leads, RoHS-compliant green molding compound ("U" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired low/high to set LSB of 7-bit I²C slave address; enables up to four AT24C256N-10SU-2.7 devices on same bus. |
| A1 | Device Address Input | Hardwired low/high to set MSB of 7-bit I²C slave address; combined with A0, selects one of four possible addresses (0x50–0x53). |
| NC | No Connect | Internally unconnected; must be left floating or tied to GND/VCC per layout best practice - no functional impact. |
| GND | Ground Reference | Primary return path for all digital and leakage currents; requires low-impedance connection to system ground plane. |
| VCC | Power Supply | Accepts 2.7–5.5 V DC; bypass capacitor (0.1 µF ceramic) required within 10 mm for stable I²C timing and noise immunity. |
| WP | Write Protect Control | Pulled low = write enabled; pulled high = all memory writes inhibited - provides hardware-level security against accidental overwrites. |
| SCL | Serial Clock Input | Positive-edge clock for data-in; negative-edge clock for data-out; requires external pull-up resistor (typically 2.2–10 kΩ). |
| SDA | Serial Data I/O | Open-drain bidirectional line; shares bus with other I²C devices; requires same external pull-up as SCL. |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte Page Write Mode | Reduces write transaction overhead by up to 64× vs. byte-write - critical for fast logging of sensor arrays or configuration snapshots. |
| Schmitt Trigger Inputs | Eliminates false triggering from slow-rising or noisy I²C signals - improves robustness in electrically harsh industrial enclosures. |
| Hardware + Software Write Protection | WP pin blocks all writes when high; software lock bits allow selective sector protection - layered security for critical calibration data. |
| Cascadable Architecture | Supports up to four AT24C256N-10SU-2.7 devices on one I²C bus using A0/A1 address pins - simplifies BOM and routing in multi-module systems. |
| Low Standby Current | 6.0 µA max at 5 V - extends battery life in portable test equipment or energy-harvesting edge nodes during idle periods. |
Applications
| Industrial PLC Configuration Storage | Smart Energy Meter Calibration Backup |
|---|---|
Use Scenario: Storing user-defined I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in manufacturing lines. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via I²C during boot and runtime reconfiguration. Use Value: Enables field-upgradable logic behavior without firmware reflashing; retains settings across AC power loss and brownouts. | Use Scenario: Preserving metrology calibration coefficients and tariff tables in ANSI C12.20-compliant electricity meters exposed to wide temperature swings. IC Role / Device Role / Timing Role: Tamper-resistant parameter vault synchronized with metrology IC reads during power-on self-test. Use Value: Guarantees ±0.1% accuracy drift compensation over 10+ years via 40-year data retention and 1M-cycle endurance. |
| Medical Infusion Pump Safety Parameters | Automotive Body Control Module Settings |
Use Scenario: Holding dose limits, occlusion pressure thresholds, and clinician access codes in Class IIa infusion pumps requiring IEC 62304 compliance. IC Role / Device Role / Timing Role: Secure, write-protected memory partition isolated from main MCU flash - updated only via authenticated service mode. Use Value: Prevents unauthorized parameter modification via WP pin hardware lock and page-write atomicity - meets IEC 62304 SW safety Class C requirements. | Use Scenario: Storing seat position memory, mirror fold/unfold preferences, and lighting profiles in 12 V automotive BCMs operating from battery-supplied 9–16 V rails. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfaced directly to 3.3 V CAN microcontroller - powered from local LDO. Use Value: Operates reliably down to 2.7 V during cold-crank conditions; withstands 125°C under-hood thermal cycling per extended temp characterization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256BN-10SU-2.7 | Process-B variant with guaranteed 1M write cycles and extended –40°C to +125°C operation; same pinout and timing. | Required for automotive under-hood or military-grade thermal environments where AT24C256N-10SU-2.7's 85°C max is insufficient. | Select when extended temperature validation, higher endurance assurance, or official "recommended for new design" status is mandatory. |
| M24256-BWMN6TP | STMicroelectronics 256 Kbit EEPROM in 8-lead SOIC; supports 1 MHz at 2.5–5.5 V but lacks 1.8 V option; identical page size and WP function. | Preferred in ST-based designs with existing M24xx footprint libraries; offers enhanced ESD rating (4 kV HBM) vs. AT24C256N-10SU-2.7's 2 kV. | Choose for ST ecosystem alignment or where higher ESD immunity is prioritized over dual-voltage flexibility. |
Compared with AT24C256N-10SU-2.7, the AT24C256BN-10SU-2.7 adds extended temperature qualification and guaranteed endurance, while the M24256-BWMN6TP trades voltage flexibility for stronger ESD robustness and ST-specific support infrastructure - both require no PCB changes but differ in qualification scope and vendor toolchain integration.
Availability
AT24C256N-10SU-2.7 is available at Aetrix Electronics and suitable for industrial control systems, smart metering platforms, and medical device configuration storage requiring stable component supply and long-term obsolescence planning.
Supply support for AT24C256N-10SU-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 components, and nonvolatile memory solutions for industrial, automotive, and communications markets.
The AT24C256 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for reliable, low-power, I²C-based parameter storage in cost-sensitive embedded systems with space-constrained layouts.
FAQ
What is the maximum I²C clock frequency supported by AT24C256N-10SU-2.7 at 2.7 V?
The AT24C256N-10SU-2.7 supports up to 400 kHz I²C clock frequency when operated at 2.7 V, as specified in Table 5 (AC Characteristics – Extended Temperatures). This ensures timing margin compliance in industrial environments with longer bus traces and higher capacitance loads.
Does AT24C256N-10SU-2.7 support 1.8 V operation?
No, AT24C256N-10SU-2.7 is rated for 2.7 V to 5.5 V operation only. The "–2.7" suffix denotes the low-voltage 2.7 V variant; 1.8 V operation requires the AT24C256N-10SU-1.8 variant, which has separate DC and AC specifications.
How many AT24C256N-10SU-2.7 devices can share the same I²C bus?
Up to four AT24C256N-10SU-2.7 devices can be connected to a single I²C bus using the A0 and A1 address pins, which configure the two LSBs of the 7-bit slave address (0x50–0x53). All devices must use unique A0/A1 combinations.
What is the purpose of the NC pin on AT24C256N-10SU-2.7?
The NC (No Connect) pin on AT24C256N-10SU-2.7 is internally unconnected and serves no electrical function. It may be left floating, tied to GND, or tied to VCC per PCB layout convenience - none affects device operation or reliability.
Is AT24C256N-10SU-2.7 suitable for new designs?
Microchip documentation states AT24C256N-10SU-2.7 is "not recommended for new design"; engineers should consider the AT24C256B series (e.g., AT24C256BN-10SU-2.7) instead, which offers improved endurance guarantees, extended temperature validation, and ongoing technical support.
AT24C256N-10SU-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOIC
AT24C256N-10SU-2.7 FAQ
1.How can I place an order for AT24C256N-10SU-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256N-10SU-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 AT24C256N-10SU-2.7 reliable?
The price and inventory of AT24C256N-10SU-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 AT24C256N-10SU-2.7 is usually 5 days.
3.What payment methods are accepted for AT24C256N-10SU-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256N-10SU-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256N-10SU-2.7?
AT24C256N-10SU-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256N-10SU-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 AT24C256N-10SU-2.7?
For technical support, including AT24C256N-10SU-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256N-10SU-2.7 requirements.
6.How does Aetrix verify that AT24C256N-10SU-2.7 is sourced from the original manufacturer or authorized distributors?
All AT24C256N-10SU-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 AT24C256N-10SU-2.7 meets industry standards.
7.What is the process for return or replacement of AT24C256N-10SU-2.7?
All AT24C256N-10SU-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256N-10SU-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 AT24C256N-10SU-2.7 part is unused and in its original packaging.
Return procedure for AT24C256N-10SU-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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