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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology AT24C128-10TU-2.7-T

Name: AT24C128-10TU-2.7-T
Brand: Microchip Technology
SKU: AT24C128-10TU-2.7-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT24C128-10TU-2.7-T

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-TSSOP (0.173", 4.40mm Width)

Datasheet:: AT24C128-10TU-2.7-T.pdf

Description:: IC EEPROM 128KBIT I2C 8TSSOP

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Product details

Overview

AT24C128-10TU-2.7-T from Microchip Technology (formerly Atmel) is a 128 Kbit (16,384 × 8) two-wire serial EEPROM with I²C-compatible interface, operating from 2.7V to 5.5V, featuring 64-byte page write mode, 1 MHz max clock at 5V, and hardware write protection via WP pin. It is used for nonvolatile parameter storage in industrial controllers, metering systems, and embedded configuration memory.

For engineers reviewing the AT24C128-10TU-2.7-T datasheet, AT24C128-10TU-2.7-T pinout, AT24C128-10TU-2.7-T application, or AT24C128-10TU-2.7-T equivalent, key selection considerations include voltage range compatibility (2.7–5.5 V), TSSOP-8 package footprint, 1 million write endurance, 40-year data retention, and cascading support for up to four devices on a shared bus.

Technical Context

The AT24C128-10TU-2.7-T implements a standard two-wire (I²C) serial interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. It supports device addressing via A0/A1 pins, enabling up to four devices on one bus, and uses a 7-bit fixed base address (1010b) with two programmable bits.

Internal architecture organizes memory as 256 pages of 64 bytes each, supporting byte-write and partial/complete page-write operations. Write cycles are self-timed (max 5 ms for "B" process version), and acknowledge polling enables host synchronization without fixed delays.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	128 Kbit (16,384 × 8), sufficient for firmware calibration tables or device configuration profiles.
Supply Voltage	2.7 V to 5.5 V - compatible with 3.3 V and 5 V logic domains without level shifting.
Interface Speed	1 MHz at 5 V, 400 kHz at 2.7 V - enables fast parameter updates in real-time systems.
Write Endurance	1,000,000 cycles - supports frequent logging or dynamic configuration in industrial edge nodes.
Data Retention	40 years at +85°C - ensures long-term reliability in unattended equipment like smart meters.
Page Size	64 bytes - allows efficient bulk writes while minimizing bus occupancy and host overhead.
Operating Temp	–40°C to +85°C - qualified for industrial ambient environments without derating.

Pinout & Package

AT24C128-10TU-2.7-T is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, 3.00 mm × 4.40 mm body, and exposed pad not connected. Pin 1 is marked by a beveled corner.

Pin/Terminal	Circuit Role	Design Meaning
A0	Device Address Input	Hardwired low/high or left floating (internally pulled down); selects LSB of 7-bit I²C address (1010A1A0).
A1	Device Address Input	Hardwired low/high or left floating; selects MSB of device address bits; enables up to four devices per bus.
NC	No Connect	Unbonded die pad; must remain unconnected on PCB to avoid parasitic coupling or ESD risk.
GND	Ground Reference	Primary return path for VCC and I/O; requires low-impedance connection to system ground plane.
VCC	Power Supply	2.7–5.5 V supply input; bypass with 0.1 µF ceramic capacitor placed within 5 mm of pin.
WP	Write Protect Control	Active-high hardware lock: tied to VCC disables all writes; tied to GND enables normal operation.
SCL	Serial Clock Input	Positive-edge sampled clock; requires external pull-up; Schmitt trigger enables robust noise rejection.
SDA	Serial Data I/O	Open-drain bidirectional line; requires external pull-up; supports wire-OR with other I²C devices.

Key Features

Feature	Design Value
Two-wire Serial Interface	Fully compliant with I²C-bus specification, enabling seamless integration with microcontrollers, SoCs, and PMICs using standard drivers.
Hardware Write Protection	WP pin provides deterministic, glitch-immune memory lock-critical for preventing accidental overwrites during power transitions.
64-byte Page Write Mode	Reduces bus transactions by up to 64× vs. byte-write; lowers host CPU load and improves system responsiveness in burst-write scenarios.
Extended Temperature Range	Rated –40°C to +85°C with full DC/AC performance - eliminates need for thermal derating in outdoor or factory-floor deployments.
Low-Power Standby	Standby current ≤ 6.0 µA at 5 V - preserves battery life in always-on IoT sensors and portable instrumentation.

Applications

Industrial Programmable Logic Controller (PLC)	Smart Energy Meter
Use Scenario: Storing calibration coefficients, firmware revision IDs, and operational history logs across power cycles. 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 traceable field calibration without requiring external backup power or FRAM.	Use Scenario: Recording tariff schedules, tamper events, and accumulated kWh values in utility-grade electricity meters. IC Role / Device Role / Timing Role: Secure, long-life data logger interfaced to metrology ASIC via shared I²C bus. Use Value: Meets ANSI C12.20 and IEC 62056 requirements for 40-year data integrity and 1M-cycle write endurance under temperature cycling.
Medical Diagnostic Equipment	Automotive Body Control Module (BCM)
Use Scenario: Saving user preferences, sensor offset corrections, and diagnostic fault codes in portable ultrasound or patient monitors. IC Role / Device Role / Timing Role: Trusted configuration store with hardware write lock to prevent unauthorized firmware or calibration changes. Use Value: Supports FDA 21 CFR Part 11 compliance through auditable, tamper-evident parameter storage with WP pin enforcement.	Use Scenario: Storing seat position memory, mirror presets, and lighting configuration in 12 V automotive BCMs. IC Role / Device Role / Timing Role: I²C slave EEPROM interfaced to 3.3 V microcontroller; powered from regulated 3.3 V rail. Use Value: Qualified for extended temperature operation (–40°C to +85°C) and withstands load-dump transients when properly decoupled.

Industrial Programmable Logic Controller (PLC)

Smart Energy Meter

Use Scenario: Storing calibration coefficients, firmware revision IDs, and operational history logs across power cycles.

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 traceable field calibration without requiring external backup power or FRAM.

Use Scenario: Recording tariff schedules, tamper events, and accumulated kWh values in utility-grade electricity meters.

IC Role / Device Role / Timing Role: Secure, long-life data logger interfaced to metrology ASIC via shared I²C bus.

Use Value: Meets ANSI C12.20 and IEC 62056 requirements for 40-year data integrity and 1M-cycle write endurance under temperature cycling.

Medical Diagnostic Equipment

Automotive Body Control Module (BCM)

Use Scenario: Saving user preferences, sensor offset corrections, and diagnostic fault codes in portable ultrasound or patient monitors.

IC Role / Device Role / Timing Role: Trusted configuration store with hardware write lock to prevent unauthorized firmware or calibration changes.

Use Value: Supports FDA 21 CFR Part 11 compliance through auditable, tamper-evident parameter storage with WP pin enforcement.

Use Scenario: Storing seat position memory, mirror presets, and lighting configuration in 12 V automotive BCMs.

IC Role / Device Role / Timing Role: I²C slave EEPROM interfaced to 3.3 V microcontroller; powered from regulated 3.3 V rail.

Use Value: Qualified for extended temperature operation (–40°C to +85°C) and withstands load-dump transients when properly decoupled.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT24C128B-SSHL-T	Same 128 Kbit capacity, TSSOP-8, but "B" process version guarantees 1M write cycles and extended temp (–40°C to +125°C).	Approved for extended temperature use; suitable for under-hood automotive or high-ambient industrial enclosures.	Select when >85°C operation or guaranteed 1M endurance is required; pinout and software identical.
M24C128-WMN6TP	STMicroelectronics 128 Kbit I²C EEPROM in TSSOP-8; supports 1 MHz @ 5 V, but rated only to 100k write cycles and 20-year retention.	Limited endurance and retention make it unsuitable for high-update-rate logging or mission-critical calibration storage.	Acceptable for cost-sensitive consumer applications with infrequent writes; verify WP functionality matches design intent.

Compared with AT24C128-10TU-2.7-T, the AT24C128B-SSHL-T extends temperature and endurance specs without layout or firmware change, while M24C128-WMN6TP trades longevity for lower unit cost in non-critical roles.

Availability

AT24C128-10TU-2.7-T is available at Aetrix Electronics and suitable for industrial automation, smart metering, and medical diagnostics requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for AT24C128-10TU-2.7-T 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 broad industrial and automotive qualification coverage.

The AT24C128-10TU-2.7-T belongs to Microchip's legacy AT24Cxx serial EEPROM family, designed for reliable, low-power configuration and data logging in space-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the AT24C128-10TU-2.7-T?

The AT24C128-10TU-2.7-T supports up to 1 MHz at VCC = 5.0 V, 400 kHz at VCC = 2.7 V, and 100 kHz at 1.8 V. Its AC characteristics are fully specified across these conditions, and timing margins comply with standard I²C bus specifications for both standard and fast-mode operation.

Does the AT24C128-10TU-2.7-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C128-10TU-2.7-T requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Typical values range from 1.3 kΩ (for 5 V/400 kHz) to 10 kΩ (for 1.8 V/100 kHz), selected based on bus capacitance and speed requirements per I²C specification.

Can the AT24C128-10TU-2.7-T be used in a 1.8 V system?

No - the AT24C128-10TU-2.7-T is specifically rated for 2.7 V to 5.5 V operation. For 1.8 V systems, Microchip offers the AT24C128-10TU-1.8-T variant, which has different internal voltage regulation and timing characteristics validated down to 1.8 V.

How does the write protect (WP) pin function on the AT24C128-10TU-2.7-T?

When WP is tied to VCC, all write operations (byte and page) to the AT24C128-10TU-2.7-T memory array are inhibited; reads remain fully functional. When WP is grounded, normal read/write operations are enabled. Floating WP is internally pulled down, but Microchip recommends hardwiring for deterministic behavior.

Is the AT24C128-10TU-2.7-T pin-compatible with newer AT24C128B variants?

Yes - the AT24C128-10TU-2.7-T and AT24C128B-SSHL-T share identical TSSOP-8 pinout, electrical interface, and command set. The "B" variant adds extended temperature rating and guaranteed 1M write endurance, but no PCB or firmware changes are needed for drop-in replacement in existing designs.

AT24C128-10TU-2.7-T Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

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-TSSOP

AT24C128-10TU-2.7-T FAQ

1.How can I place an order for AT24C128-10TU-2.7-T through Aetrix?

Please submit a Request for Quotation (RFQ) for AT24C128-10TU-2.7-T 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 AT24C128-10TU-2.7-T reliable?

The price and inventory of AT24C128-10TU-2.7-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C128-10TU-2.7-T is usually 5 days.

3.What payment methods are accepted for AT24C128-10TU-2.7-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C128-10TU-2.7-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT24C128-10TU-2.7-T?

AT24C128-10TU-2.7-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT24C128-10TU-2.7-T 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 AT24C128-10TU-2.7-T?

For technical support, including AT24C128-10TU-2.7-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C128-10TU-2.7-T requirements.

6.How does Aetrix verify that AT24C128-10TU-2.7-T is sourced from the original manufacturer or authorized distributors?

All AT24C128-10TU-2.7-T 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 AT24C128-10TU-2.7-T meets industry standards.

7.What is the process for return or replacement of AT24C128-10TU-2.7-T?

All AT24C128-10TU-2.7-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C128-10TU-2.7-T, 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 AT24C128-10TU-2.7-T part is unused and in its original packaging.

Return procedure for AT24C128-10TU-2.7-T:

1.Submit a request within 90 days.

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

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