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Microchip Technology AT24C256-10PC-1.8
- Part No.:
- AT24C256-10PC-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT24C256-10PC-1.8.pdf
- Description:
- IC EEPROM 256KBIT I2C 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,137
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Product details
Overview
AT24C256-10PC-1.8 from Microchip Technology (formerly Atmel) is a 256 Kbit (32,768 × 8) I²C-compatible serial EEPROM optimized for ultra-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 WP pin, and delivers 100,000 write cycles with 40-year data retention - ideal for battery-powered IoT sensors and portable medical devices.
For engineers reviewing the AT24C256-10PC-1.8 datasheet, AT24C256-10PC-1.8 pinout, AT24C256-10PC-1.8 application, or AT24C256-10PC-1.8 equivalent, key selection criteria include 1.8 V minimum supply compatibility, 64-byte page write capability, Schmitt-triggered noise-immune inputs, and support for up to four cascaded devices on a shared 2-wire bus.
Technical Context
The AT24C256-10PC-1.8 implements a standard two-wire (I²C) interface with open-drain SDA/SCL pins, internal address counter for sequential reads, and cascading support via A0/A1 device address pins. Its memory is organized as 512 pages of 64 bytes each, enabling efficient partial-page writes without cross-page rollover.
It uses a self-timed internal write cycle (max 20 ms), supports acknowledge polling for write completion detection, and incorporates Schmitt-triggered inputs with filtering to suppress EMI in noisy industrial environments - all while maintaining <0.2 µA standby current at 1.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits), sufficient for firmware parameter storage or calibration data in resource-constrained microcontrollers |
| Supply Voltage Range | 1.8 V to 3.6 V - enables direct interfacing with 1.8 V logic families and low-power SoCs without level shifting |
| I²C Clock Frequency | 100 kHz at 1.8 V - ensures reliable timing margin under low-voltage operation with standard pull-up resistors |
| Write Cycle Time | Max 20 ms - defines minimum interval between write commands; impacts real-time logging latency |
| Endurance | 100,000 write cycles - supports frequent configuration updates in field-deployed edge nodes |
| Data Retention | 40 years at +85°C - guarantees long-term reliability in automotive or industrial control applications |
| Standby Current | 0.2 µA typical at 1.8 V - critical for multi-year battery life in coin-cell-powered devices |
Pinout & Package
AT24C256-10PC-1.8 is packaged in an 8-pin plastic dual in-line package (PDIP), 0.300" wide, with industry-standard pinout compatible with legacy socket designs and manual prototyping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired low/high to select one of four possible I²C addresses (0x50–0x53); floating defaults to logic low |
| A1 | Device Address Input | Second address bit; used with A0 to enable up to four AT24C256-10PC-1.8 devices on same bus without address conflict |
| NC | No Connect | Internally unconnected; must be left floating or tied to GND/VCC per layout best practice - no functional impact |
| GND | Ground Reference | Return path for all internal circuitry and I/O; requires low-impedance connection to system ground plane |
| VCC | Power Supply | 1.8 V to 3.6 V input; bypass capacitor (0.1 µF ceramic) required within 10 mm for stable low-voltage operation |
| WP | Write Protect Control | Active-high hardware lock: tied to VCC disables all writes; tied to GND enables full read/write access |
| SCL | Serial Clock Input | Open-drain input synchronized to master clock; requires external pull-up resistor (typically 4.7 kΩ @ 1.8 V) |
| SDA | Serial Data I/O | Bidirectional open-drain bus line; shares pull-up with SCL; supports wire-OR with other I²C peripherals |
Key Features
| Feature | Design Value |
|---|---|
| 1.8 V Operation | Enables seamless integration with modern ultra-low-power MCUs (e.g., ARM Cortex-M0+, MSP430FR) without voltage translation |
| 64-byte Page Write | Reduces write overhead by up to 63× vs. byte-write mode - accelerates bulk parameter updates in telemetry firmware |
| Schmitt Trigger Inputs | Provides >300 mV hysteresis on SDA/SCL, rejecting high-frequency noise in motor-driven or switching-power-supply environments |
| Hardware Write Protection | WP pin allows irreversible lock of critical configuration sectors during production programming or field deployment |
| Cascadable Architecture | Supports up to four AT24C256-10PC-1.8 devices on one I²C bus using A0/A1 address pins - simplifies multi-sensor BOM management |
Applications
| Smart Energy Meters | Wearable Health Monitors |
|---|---|
Use Scenario: Storing tariff schedules, metering logs, and tamper-event timestamps across power outages. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 40-year retention and 100,000-cycle endurance under daily write loads. Use Value: Eliminates need for backup capacitors or supercapacitors by operating reliably down to 1.8 V during brownout conditions. | Use Scenario: Saving calibrated sensor offsets, user profiles, and session history in Bluetooth-enabled ECG patches. IC Role / Device Role / Timing Role: Low-leakage data logger interfaced directly to 1.8 V BLE SoC, minimizing quiescent current draw. Use Value: 0.2 µA standby current extends coin-cell battery life beyond 3 years without compromising data integrity. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: Holding factory-set calibration coefficients and diagnostic fault codes in DIN-rail-mounted controllers. IC Role / Device Role / Timing Role: Robust I²C slave with Schmitt-triggered inputs immune to EMI from adjacent 24 V relay coils and solenoids. Use Value: >4000 V HBM ESD rating ensures survival during board-level handling and in-cabinet maintenance. | Use Scenario: Storing seat position memory, mirror presets, and lighting configuration in 12 V vehicle subsystems with LDO-regulated 1.8 V rails. IC Role / Device Role / Timing Role: Automotive-grade EEPROM qualified for -40°C to +85°C operation with AEC-Q100 stress testing compliance. Use Value: Hardware WP pin prevents accidental overwrites during CAN-based firmware updates or dealership reprogramming. |
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, 1.8 V–5.5 V range, but rated for 1 MHz max I²C speed; higher ICC (3 mA read @ 5 V) | Better suited for high-throughput data logging where 400 kHz+ bus speed is required | Select when system clock budget allows faster I²C and higher supply current is acceptable |
| Renesas R1EX25256ASAS0I#U0 | Identical 256 Kbit/1.8 V–3.6 V spec, but offers extended temperature range (-40°C to +105°C) and AEC-Q100 Grade 2 qualification | Required for under-hood automotive applications exceeding +85°C ambient | Choose for engine bay or transmission control modules needing extended thermal margin |
Compared with M24C256-WMN6TP and R1EX25256ASAS0I#U0, the AT24C256-10PC-1.8 provides optimal balance of ultra-low standby current (0.2 µA), proven industrial reliability, and PDIP package ease-of-use - making it preferred for cost-sensitive, battery-operated, or manually assembled designs where 100 kHz I²C bandwidth suffices.
Availability
AT24C256-10PC-1.8 is available at Aetrix Electronics and suitable for smart metering, wearable health monitoring, industrial PLC I/O modules, and automotive body control units requiring stable component supply across long product lifecycles.
Supply support for AT24C256-10PC-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 embedded control and connectivity.
The AT24C256-10PC-1.8 belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-voltage, high-reliability data storage in space- and power-constrained embedded systems.
FAQ
What is the maximum I²C clock frequency supported by AT24C256-10PC-1.8 at 1.8 V?
The AT24C256-10PC-1.8 supports a maximum I²C clock frequency of 100 kHz when operating at 1.8 V. This is specified in the AC Characteristics table under the "1.8-volt" column for parameter fSCL. Higher frequencies (up to 400 kHz or 1 MHz) require ≥2.5 V or 5.0 V supply, respectively - the AT24C256-10PC-1.8 variant is optimized for robustness at the lowest voltage point.
Does AT24C256-10PC-1.8 support page write operations, and what is the page size?
Yes, the AT24C256-10PC-1.8 supports 64-byte page write operations. The memory is internally organized into 512 pages of 64 bytes each. Partial page writes are allowed, and the address automatically increments within the page; attempting to write beyond the 64-byte boundary causes rollover to the start of the same page - a behavior explicitly documented in the "Write Operations" section.
How does the Write Protect (WP) pin function on AT24C256-10PC-1.8?
On the AT24C256-10PC-1.8, the WP pin is active-high: when tied to VCC, all write operations (byte and page) are inhibited; when tied to GND, full read/write access is enabled. If left unconnected, an internal pull-down defaults WP to GND, enabling writes. This hardware lock complements software write protection and is critical for safeguarding calibration data in production or field use.
What package type is used for AT24C256-10PC-1.8, and are there footprint-compatible alternatives?
The AT24C256-10PC-1.8 uses an 8-pin plastic dual in-line package (PDIP), 0.300" wide (package code 8P3). It shares identical pinout and spacing with JEDEC MS-001 BA standard. Footprint-compatible alternatives include SOIC-8 (8S1/8S2) and TSSOP-14 (14T) variants of the same AT24C256 family - though those require PCB redesign, the PDIP version enables breadboard evaluation and through-hole manufacturing.
Is AT24C256-10PC-1.8 qualified for automotive applications?
The AT24C256-10PC-1.8 is rated for industrial temperature range (−40°C to +85°C) and carries automotive-grade qualification per the "Automotive Grade and Extended Temperature Devices Available" feature note. However, it is not AEC-Q100 certified. For full automotive qualification, Microchip offers the AT24C256-10PI-1.8 (industrial temp) or pin-compatible AEC-Q100 variants like the R1EX25256ASAS0I#U0 - always verify qualification status against latest Microchip documentation before deployment in safety-critical systems.
AT24C256-10PC-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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT24C256-10PC-1.8 FAQ
1.How can I place an order for AT24C256-10PC-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256-10PC-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 AT24C256-10PC-1.8 reliable?
The price and inventory of AT24C256-10PC-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 AT24C256-10PC-1.8 is usually 5 days.
3.What payment methods are accepted for AT24C256-10PC-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256-10PC-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256-10PC-1.8?
AT24C256-10PC-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256-10PC-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 AT24C256-10PC-1.8?
For technical support, including AT24C256-10PC-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256-10PC-1.8 requirements.
6.How does Aetrix verify that AT24C256-10PC-1.8 is sourced from the original manufacturer or authorized distributors?
All AT24C256-10PC-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 AT24C256-10PC-1.8 meets industry standards.
7.What is the process for return or replacement of AT24C256-10PC-1.8?
All AT24C256-10PC-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256-10PC-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 AT24C256-10PC-1.8 part is unused and in its original packaging.
Return procedure for AT24C256-10PC-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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