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Microchip Technology AT24C128W-10SI-2.7

Name: AT24C128W-10SI-2.7
Brand: Microchip Technology
SKU: AT24C128W-10SI-2.7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT24C128W-10SI-2.7

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-SOIC (0.209", 5.30mm Width)

Datasheet:: AT24C128W-10SI-2.7.pdf

Description:: IC EEPROM 128KBIT I2C 8SOIC

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Product details

Overview

AT24C128W-10SI-2.7 from Microchip Technology (formerly Atmel) is a 128 Kbit (16,384 × 8) two-wire serial EEPROM optimized for low-voltage industrial applications. It operates from 2.7V to 5.5V, supports 400 kHz I²C bus speed at 2.7V, features hardware write protection via the WP pin, and delivers 100,000 write cycles with 40-year data retention - used in embedded system configuration storage, sensor calibration data logging, and power meter firmware parameter backup.

For engineers reviewing the AT24C128W-10SI-2.7 datasheet, AT24C128W-10SI-2.7 pinout, AT24C128W-10SI-2.7 application, or AT24C128W-10SI-2.7 equivalent, key selection considerations include its industrial temperature range (–40°C to +85°C), 8-pin SOIC (8S2) package, 64-byte page write capability, Schmitt-triggered noise-immune inputs, and compatibility with standard I²C controllers without level-shifting.

Technical Context

The AT24C128W-10SI-2.7 implements a standard two-wire (I²C-compatible) serial interface with open-drain SDA and active-high SCL, supporting device addressing via A0/A1 pins for up to four devices on one bus. Its memory is organized as 256 pages of 64 bytes each, with internal address auto-increment during sequential reads and page-boundary roll-over during writes.

It uses a self-timed internal write cycle (max 10 ms), supports acknowledge polling for write completion detection, and integrates input filtering and Schmitt-trigger inputs to suppress EMI in noisy industrial environments. The WP pin enables hardware-level write protection, while floating A0/A1 pins default to logic low for backward compatibility with AT24C32/64.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	128 Kbit (16,384 × 8) nonvolatile EEPROM - stores boot configuration, calibration coefficients, or event logs across power cycles.
Supply voltage	2.7V to 5.5V - interoperable with 3.3V microcontrollers and legacy 5V systems without external regulators.
I²C speed	400 kHz max at 2.7V - enables fast parameter updates in real-time control loops without bus contention.
Write endurance	100,000 write cycles - supports daily firmware updates or sensor recalibration over 27 years of operation.
Data retention	40 years at +85°C - ensures long-term reliability in sealed industrial enclosures with no maintenance access.
Operating temperature	–40°C to +85°C - qualified for use in outdoor utility meters, factory automation PLCs, and automotive body control modules.
Page write size	64-byte page mode - reduces write latency vs. byte-write; partial page writes allowed for efficient small-data updates.
ESD protection	>4000V HBM - withstands handling and board-level ESD events in manufacturing and field service environments.

Pinout & Package

AT24C128W-10SI-2.7 is supplied in an 8-lead, 0.200" wide Plastic Gull Wing Small Outline Package (EIAJ SOIC), designated as package code 8S2 per Microchip's ordering information. Dimensions: 4.90 mm × 3.91 mm × 1.75 mm (L × W × H), with 1.27 mm pitch.

Pin/Terminal	Circuit Role	Design Meaning
A0	Device address input	Hardwired low/high or left floating (defaults low); selects 1 of 4 possible addresses on shared I²C bus.
A1	Device address input	Same function as A0; combined with A0, enables up to four AT24C128W-10SI-2.7 devices on one 2-wire bus.
NC	No connect	Internally unconnected; must remain unconnected on PCB - no pull-up/down or routing required.
GND	Ground reference	System ground return path for all internal circuitry and I/O; requires low-impedance connection to minimize noise coupling.
VCC	Power supply	Primary DC supply (2.7–5.5 V); bypassing with 100 nF ceramic capacitor near pin is mandatory for stable operation.
WP	Write protect control	Active-high hardware lock: tied to VCC disables all writes; tied to GND or floating enables full read/write access.
SCL	Serial clock input	Positive-edge sampled clock for I²C communication; requires external pull-up resistor (typically 2.2–10 kΩ).
SDA	Serial data I/O	Bidirectional open-drain data line; shares pull-up with SCL or uses dedicated resistor; supports multi-master arbitration.

Key Features

Feature	Design Value
Low-voltage operation	Functional down to 2.7V supply - eliminates need for voltage translators when interfacing with 3.3V MCUs in battery-backed systems.
Schmitt-trigger inputs	Input hysteresis on SCL/SDA - rejects transient noise up to 300 mV peak-to-peak, critical for factory-floor or motor-drive proximity.
64-byte page write	Reduces average write time by 94% vs. byte-write for 64-byte blocks - accelerates firmware patching or bulk sensor data logging.
Hardware write protection	Dedicated WP pin with internal pull-down - prevents accidental overwrites during power-up glitches or firmware bugs without software overhead.
Industrial temperature grade	Qualified from –40°C to +85°C - validated for continuous operation in unheated outdoor cabinets or under-hood automotive ECUs.
High-reliability EEPROM	100,000 write cycles and 40-year retention at +85°C - exceeds IEC 60730 Class B requirements for safety-critical embedded storage.

Applications

Smart Energy Metering	Industrial PLC Configuration
Use Scenario: Storing tariff schedules, meter calibration constants, and tamper-event timestamps in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed retention across 15+ year field life and frequent write cycles during firmware upgrades. Use Value: Eliminates need for external backup capacitors or supercapacitors; WP pin prevents corruption during brown-out conditions.	Use Scenario: Holding I/O mapping tables, PID tuning parameters, and user-defined logic state in programmable logic controllers. IC Role / Device Role / Timing Role: Configuration EEPROM accessed at startup and during runtime reconfiguration via Modbus RTU over RS-485. Use Value: Enables field-upgradable control logic without replacing main controller; 400 kHz I²C speed allows sub-10ms config reload.
Automotive Body Control Module	Medical Diagnostic Equipment
Use Scenario: Saving seat/mirror position presets, lighting profiles, and error-code history in 12V vehicle subsystems. IC Role / Device Role / Timing Role: Robust data logger interfaced to CAN-connected microcontroller via I²C; operates across cold-crank (6.5V) to load-dump (18V) transients. Use Value: Industrial temp rating and >4000V ESD withstand ensure reliability in high-noise automotive harness environments.	Use Scenario: Retaining calibration coefficients, usage counters, and regulatory audit logs in portable ultrasound or ECG devices. IC Role / Device Role / Timing Role: Secure configuration store with hardware write lock; accessed only during service mode to prevent accidental erasure. Use Value: 40-year data retention meets FDA 21 CFR Part 11 long-term recordkeeping requirements without battery backup.

Smart Energy Metering

Industrial PLC Configuration

Use Scenario: Storing tariff schedules, meter calibration constants, and tamper-event timestamps in DIN-rail mounted electricity meters.

IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed retention across 15+ year field life and frequent write cycles during firmware upgrades.

Use Value: Eliminates need for external backup capacitors or supercapacitors; WP pin prevents corruption during brown-out conditions.

Use Scenario: Holding I/O mapping tables, PID tuning parameters, and user-defined logic state in programmable logic controllers.

IC Role / Device Role / Timing Role: Configuration EEPROM accessed at startup and during runtime reconfiguration via Modbus RTU over RS-485.

Use Value: Enables field-upgradable control logic without replacing main controller; 400 kHz I²C speed allows sub-10ms config reload.

Automotive Body Control Module

Medical Diagnostic Equipment

Use Scenario: Saving seat/mirror position presets, lighting profiles, and error-code history in 12V vehicle subsystems.

IC Role / Device Role / Timing Role: Robust data logger interfaced to CAN-connected microcontroller via I²C; operates across cold-crank (6.5V) to load-dump (18V) transients.

Use Value: Industrial temp rating and >4000V ESD withstand ensure reliability in high-noise automotive harness environments.

Use Scenario: Retaining calibration coefficients, usage counters, and regulatory audit logs in portable ultrasound or ECG devices.

IC Role / Device Role / Timing Role: Secure configuration store with hardware write lock; accessed only during service mode to prevent accidental erasure.

Use Value: 40-year data retention meets FDA 21 CFR Part 11 long-term recordkeeping requirements without battery backup.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STMicroelectronics M24C128-WMN6TP	Same 128Kbit size, 2.5–5.5V supply, 400 kHz I²C, industrial temp, but uses 8-lead SO8 (JEDEC SOIC, 150 mil) package - pinout identical to AT24C128W-10SI-2.7.	Identical functional role; differs only in manufacturer-specific AC timing margins and ESD rating (4kV HBM vs. 4kV HBM - same spec).	Select when dual-sourcing is required or ST distribution channels offer better lead times; drop-in replacement with no layout change.
ON Semiconductor CAT24C128WI-GT3	128Kbit, 1.7–5.5V supply, 400 kHz I²C, industrial temp, 8-lead SOIC (150 mil), but lacks dedicated WP pin - write protection implemented only via software address locking.	Not suitable where hardware-level write lock is mandated (e.g., IEC 62366 usability validation); requires firmware changes to emulate WP behavior.	Choose only if cost sensitivity outweighs hardware security needs; not recommended for safety-critical or regulated equipment.

Compared with M24C128-WMN6TP and CAT24C128WI-GT3, the AT24C128W-10SI-2.7 provides guaranteed hardware write protection and tighter tAA (0.05 µs typical) for faster read response - critical in time-constrained boot sequences and deterministic control loops.

Availability

AT24C128W-10SI-2.7 is available at Aetrix Electronics and suitable for smart energy metering, industrial PLC configuration, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for AT24C128W-10SI-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 memory solutions, with a focus on embedded control and connectivity.

The AT24C128W-10SI-2.7 belongs to Microchip's legacy AT24C serial EEPROM family, designed specifically for robust, low-power, industrial-grade nonvolatile data storage in space-constrained and electrically noisy environments.

FAQ

What is the maximum I²C clock frequency supported by the AT24C128W-10SI-2.7?

The AT24C128W-10SI-2.7 supports up to 400 kHz I²C clock frequency when operating within its 2.7V to 5.5V supply range. This is confirmed in the AC Characteristics table for the "2.7V" option, where fSCL max = 400 kHz. It does not support 1 MHz operation - that rating applies only to 5.0V versions like AT24C128-10CC.

Does the AT24C128W-10SI-2.7 have a built-in write protect feature?

Yes, the AT24C128W-10SI-2.7 includes a dedicated Write Protect (WP) pin. When WP is driven high to VCC, all write operations to the memory array are inhibited. If left unconnected, WP is internally pulled down to GND, enabling normal read/write functionality. This hardware-level protection is independent of software commands.

What package type is used for the AT24C128W-10SI-2.7?

The AT24C128W-10SI-2.7 uses an 8-lead, 0.200" wide Plastic Gull Wing Small Outline Package (EIAJ SOIC), designated as package code 8S2. Its dimensions are 4.90 mm × 3.91 mm × 1.75 mm with 1.27 mm lead pitch, and it is rated for industrial temperature operation (–40°C to +85°C).

How many devices can share the same I²C bus with the AT24C128W-10SI-2.7?

Up to four AT24C128W-10SI-2.7 devices can be connected to a single I²C bus using the A0 and A1 address input pins. Each device is assigned a unique 2-bit hardware address (00, 01, 10, or 11), allowing individual addressing without bus contention or software arbitration overhead.

What is the write endurance and data retention specification for the AT24C128W-10SI-2.7?

The AT24C128W-10SI-2.7 guarantees 100,000 write/erase cycles and 40 years of data retention at +85°C. These values are specified in the "High Reliability" section and confirmed in the DC Characteristics table under Endurance and Data Retention notes - validated across the full industrial temperature range.

AT24C128W-10SI-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:: 128Kbit

Memory Organization:: 16K 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

AT24C128W-10SI-2.7 FAQ

1.How can I place an order for AT24C128W-10SI-2.7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT24C128W-10SI-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 AT24C128W-10SI-2.7 reliable?

The price and inventory of AT24C128W-10SI-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 AT24C128W-10SI-2.7 is usually 5 days.

3.What payment methods are accepted for AT24C128W-10SI-2.7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C128W-10SI-2.7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT24C128W-10SI-2.7?

AT24C128W-10SI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT24C128W-10SI-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 AT24C128W-10SI-2.7?

For technical support, including AT24C128W-10SI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C128W-10SI-2.7 requirements.

6.How does Aetrix verify that AT24C128W-10SI-2.7 is sourced from the original manufacturer or authorized distributors?

All AT24C128W-10SI-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 AT24C128W-10SI-2.7 meets industry standards.

7.What is the process for return or replacement of AT24C128W-10SI-2.7?

All AT24C128W-10SI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT24C128W-10SI-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 AT24C128W-10SI-2.7 part is unused and in its original packaging.

Return procedure for AT24C128W-10SI-2.7:

1.Submit a request within 90 days.

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

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