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Microchip Technology AT24C256-10PU-1.8

Name: AT24C256-10PU-1.8
Brand: Microchip Technology
SKU: AT24C256-10PU-1.8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT24C256-10PU-1.8

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: AT24C256-10PU-1.8.pdf

Description:: IC EEPROM 256KBIT I2C 8DIP

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Product details

Overview

AT24C256-10PU-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 ultra-low standby current (0.2 µA at 1.8 V) is critical.

For engineers reviewing the AT24C256-10PU-1.8 datasheet, AT24C256-10PU-1.8 pinout, AT24C256-10PU-1.8 application, or AT24C256-10PU-1.8 equivalent, key selection considerations include its 1.8 V operation range, 64-byte page write capability, Schmitt-triggered noise-immune inputs, and compatibility with standard I²C controllers in space-constrained industrial modules.

Technical Context

The AT24C256-10PU-1.8 implements a standard two-wire (I²C-compatible) interface with open-drain SDA and edge-triggered SCL, supporting cascaded addressing via A0/A1 pins for up to four devices on one bus. Its memory is organized as 512 pages of 64 bytes each, enabling efficient partial-page writes without rollover across page boundaries when limited to ≤64 bytes per transaction.

It uses internal address counters for sequential reads and supports three read modes-current address, random address (via dummy write), and sequential-with acknowledge polling during write cycles. The device enters low-power standby mode automatically after STOP condition receipt and remains responsive to START conditions even in standby.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	256 Kbit (32,768 × 8 bits), sufficient for storing full configuration sets or multi-sensor calibration tables in compact MCU-based systems.
Supply Voltage Range	1.8 V to 3.6 V - enables direct integration with 1.8 V logic families and battery-powered IoT nodes without level-shifting.
I²C Clock Frequency	100 kHz max at 1.8 V - ensures reliable timing margin under low-voltage conditions while maintaining interoperability with legacy I²C masters.
Write Cycle Time	5 ms maximum - defines minimum interval between write commands; impacts firmware update latency and real-time logging throughput.
Endurance & Retention	1 million write cycles / 40 years data retention - meets long-life requirements for field-deployed equipment with infrequent but critical nonvolatile updates.
Standby Current	0.2 µA at 1.8 V - minimizes quiescent power draw in always-on monitoring systems powered by coin cells or energy harvesters.
Package Type	8-lead PDIP (8P3) - through-hole package suitable for prototyping, test fixtures, and legacy industrial PCBs requiring mechanical robustness.

Pinout & Package

AT24C256-10PU-1.8 is housed in an 8-lead JEDEC-standard Plastic Dual Inline Package (PDIP), 0.300" wide body, RoHS-compliant and halogen-free ("U" suffix). Pin 1 is located at bottom-left corner when viewing top-side marking side with notch or dot oriented left.

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 (0x50–0x53) for bus sharing.
A1	Device Address Input	Same function as A0; combined with A0, enables up to four AT24C256-10PU-1.8 devices on a single I²C bus without address conflict.
NC	No Connect	Unbonded die pad; must remain unconnected on PCB to avoid parasitic coupling or unintended biasing.
GND	Ground Reference	Primary return path for all internal circuitry; requires low-impedance connection to system ground plane to ensure noise immunity.
VCC	Power Supply	Accepts 1.8–3.6 V DC; decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable I²C timing and write reliability.
WP	Write Protect Control	Active-high signal: tied to VCC disables all writes; tied to GND enables normal write operations; floating defaults to write-enable.
SCL	Serial Clock Input	Positive-edge clock for data sampling; requires external pull-up resistor (typically 10 kΩ @ 1.8 V) to VCC for proper I²C bus operation.
SDA	Serial Data I/O	Bidirectional open-drain line shared across multiple I²C devices; requires same pull-up as SCL and supports wire-OR arbitration.

Key Features

Feature	Design Value
Low-voltage operation (1.8 V)	Enables direct interfacing with 1.8 V microcontrollers and FPGAs without voltage translation, reducing BOM count and layout complexity.
64-byte page write mode	Allows burst programming of up to 64 bytes per write cycle, improving firmware update efficiency compared to byte-by-byte writes.
Schmitt-triggered inputs	Provides hysteresis on SCL/SDA lines to reject high-frequency noise and ensure clean signal transitions in electrically noisy industrial environments.
Hardware write protection (WP pin)	Prevents accidental overwrites during power-up/down or firmware glitches by physically disabling write access independent of software state.
Extended temperature support	Qualified for industrial temperature range (–40°C to +85°C), ensuring reliable operation in factory automation, outdoor metering, and motor control enclosures.

Applications

Industrial Sensor Calibration Storage	Embedded Firmware Parameter Backup
Use Scenario: Storing factory-calibrated coefficients for temperature, pressure, and humidity sensors in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding trim values accessed at boot time by host MCU via I²C. Use Value: Eliminates need for external calibration EEPROMs; 1.8 V operation allows co-location with low-power sensor signal chains.	Use Scenario: Preserving user-modified settings (e.g., display brightness, communication baud rate) across power cycles in medical diagnostic handhelds. IC Role / Device Role / Timing Role: Persistent parameter store updated only when settings change, minimizing wear on flash memory. Use Value: 1 million endurance cycles ensure >10 years of daily reconfiguration; 0.2 µA standby current extends battery life significantly.
Smart Energy Meter Configuration	Automated Test Equipment (ATE) Fixture Data
Use Scenario: Holding tariff schedules, billing thresholds, and utility-specific communication parameters in ANSI C12.19-compliant meters. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for regulatory-critical configuration data accessible only via authenticated I²C commands. Use Value: Hardware WP pin prevents unauthorized modification; 40-year data retention meets utility infrastructure lifetime requirements.	Use Scenario: Recording pass/fail results, calibration offsets, and test sequence versions for production-line ATE fixtures operating in 24/7 environments. IC Role / Device Role / Timing Role: Localized logging buffer that survives fixture power cycling and enables traceability without network dependency. Use Value: Page-write capability allows rapid batch logging; PDIP package simplifies socket-based replacement during maintenance.

Industrial Sensor Calibration Storage

Embedded Firmware Parameter Backup

Use Scenario: Storing factory-calibrated coefficients for temperature, pressure, and humidity sensors in programmable logic controllers.

IC Role / Device Role / Timing Role: Nonvolatile configuration register holding trim values accessed at boot time by host MCU via I²C.

Use Value: Eliminates need for external calibration EEPROMs; 1.8 V operation allows co-location with low-power sensor signal chains.

Use Scenario: Preserving user-modified settings (e.g., display brightness, communication baud rate) across power cycles in medical diagnostic handhelds.

IC Role / Device Role / Timing Role: Persistent parameter store updated only when settings change, minimizing wear on flash memory.

Use Value: 1 million endurance cycles ensure >10 years of daily reconfiguration; 0.2 µA standby current extends battery life significantly.

Smart Energy Meter Configuration

Automated Test Equipment (ATE) Fixture Data

Use Scenario: Holding tariff schedules, billing thresholds, and utility-specific communication parameters in ANSI C12.19-compliant meters.

IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for regulatory-critical configuration data accessible only via authenticated I²C commands.

Use Value: Hardware WP pin prevents unauthorized modification; 40-year data retention meets utility infrastructure lifetime requirements.

Use Scenario: Recording pass/fail results, calibration offsets, and test sequence versions for production-line ATE fixtures operating in 24/7 environments.

IC Role / Device Role / Timing Role: Localized logging buffer that survives fixture power cycling and enables traceability without network dependency.

Use Value: Page-write capability allows rapid batch logging; PDIP package simplifies socket-based replacement during maintenance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT24C256B-10PU-1.8	Successor revision with enhanced ESD rating (4 kV HBM), improved AC timing margins, and extended qualification for automotive-grade temperature range (–40°C to +125°C).	Required for new designs targeting AEC-Q100 compliance or higher-reliability industrial deployments beyond –40°C to +85°C.	Select AT24C256B-10PU-1.8 if long-term supply continuity, automotive qualification, or stricter ESD immunity are design priorities.
M24C256-WMN6TP	STMicroelectronics 256 Kbit I²C EEPROM in 8-lead SOIC; supports 1.7–5.5 V, 400 kHz @ 1.7 V, and offers 1.8 million write cycles.	Offers broader voltage range and higher endurance, but lacks native 1.8 V–3.6 V optimization and has different pinout (SOIC vs PDIP).	Choose M24C256-WMN6TP when migrating to surface-mount assembly or requiring wider supply flexibility without redesigning power rails.

Compared with AT24C256-10PU-1.8, the AT24C256B-10PU-1.8 provides longer lifecycle assurance and automotive-grade robustness, while the M24C256-WMN6TP enables smaller footprint and higher endurance at the cost of package change and less precise 1.8 V optimization.

Availability

AT24C256-10PU-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded firmware parameter backup, and smart energy meter configuration requiring stable component supply and long-term obsolescence management.

Supply support for AT24C256-10PU-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 AT24Cxx EEPROM family. The company specializes in microcontrollers, analog, and memory solutions for industrial, automotive, and consumer markets.

The AT24C256-10PU-1.8 belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-voltage, low-power embedded systems requiring reliable nonvolatile storage with minimal external components and I²C bus simplicity.

FAQ

What is the maximum I²C clock frequency supported by AT24C256-10PU-1.8 at 1.8 V?

The AT24C256-10PU-1.8 supports a maximum I²C clock frequency of 100 kHz when operated at 1.8 V. This value is specified in Table 4 (AC Characteristics – Industrial Temperatures) and reflects guaranteed timing margins under worst-case low-voltage conditions. Higher frequencies (e.g., 400 kHz) require ≥2.5 V supply and are not valid for AT24C256-10PU-1.8 operation.

Does AT24C256-10PU-1.8 support page write operations, and what is the maximum page size?

Yes, AT24C256-10PU-1.8 supports page write mode with a fixed page size of 64 bytes. As stated in the Features section and Memory Organization table, it is internally organized into 512 pages of 64 bytes each. Partial page writes are allowed, and exceeding 64 bytes in a single write transaction causes rollover within the same page - a behavior confirmed in the "Page Write" subsection of the datasheet.

Is AT24C256-10PU-1.8 pin-compatible with AT24C256B-10PU-1.8?

Yes, AT24C256-10PU-1.8 and AT24C256B-10PU-1.8 share identical pinout, package (8P3 PDIP), and electrical interface. The "B" revision is a drop-in replacement with enhanced specifications (e.g., extended temperature range, higher ESD rating), and Microchip explicitly positions it as the recommended successor for new designs - confirming mechanical and functional compatibility.

What is the standby current consumption of AT24C256-10PU-1.8 at 1.8 V?

The standby current (ISB1) of AT24C256-10PU-1.8 is specified as 0.2 µA maximum at VCC = 1.8 V and TA = 25°C, per Table 3 (DC Characteristics). This ultra-low quiescent draw is achieved through internal power-gating and makes the device suitable for battery-backed or energy-harvesting applications where leakage must be minimized.

Can AT24C256-10PU-1.8 be used in extended temperature applications (–40°C to +125°C)?

No - AT24C256-10PU-1.8 is qualified only for the industrial temperature range (–40°C to +85°C), as indicated in the Ordering Information table and Absolute Maximum Ratings. For extended temperature operation up to +125°C, Microchip recommends AT24C256B-10PU-1.8, which carries explicit approval for that range per Note 5 in Table 5.

AT24C256-10PU-1.8 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

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:: Through Hole

Supplier Device Package:: 8-PDIP

AT24C256-10PU-1.8 FAQ

1.How can I place an order for AT24C256-10PU-1.8 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT24C256-10PU-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 AT24C256-10PU-1.8 reliable?

The price and inventory of AT24C256-10PU-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 AT24C256-10PU-1.8 is usually 5 days.

3.What payment methods are accepted for AT24C256-10PU-1.8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256-10PU-1.8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT24C256-10PU-1.8?

AT24C256-10PU-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT24C256-10PU-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 AT24C256-10PU-1.8?

For technical support, including AT24C256-10PU-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256-10PU-1.8 requirements.

6.How does Aetrix verify that AT24C256-10PU-1.8 is sourced from the original manufacturer or authorized distributors?

All AT24C256-10PU-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 AT24C256-10PU-1.8 meets industry standards.

7.What is the process for return or replacement of AT24C256-10PU-1.8?

All AT24C256-10PU-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256-10PU-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 AT24C256-10PU-1.8 part is unused and in its original packaging.

Return procedure for AT24C256-10PU-1.8:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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