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

Microchip Technology AT34C02-10TU-1.8-T

Name: AT34C02-10TU-1.8-T
Brand: Microchip Technology
SKU: AT34C02-10TU-1.8-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT34C02-10TU-1.8-T

Manufacturer:: Microchip Technology

Category:: Memory

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

Datasheet:: AT34C02-10TU-1.8-T.pdf

Description:: IC EEPROM 2KBIT I2C 8TSSOP

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Product details

Overview

AT34C02-10TU-1.8-T from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) serial EEPROM with dual-voltage operation (1.8 V to 5.5 V), permanent software write protection for the first 1K bits (00H–7FH), hardware write protection via WP pin, and 2-wire I²C-compatible interface. It supports 100 kHz operation at 1.8 V, 16-byte page writes, and delivers 1 million write cycles with 100-year data retention - deployed in automotive body control modules, industrial sensor nodes, and smart meter calibration storage.

For engineers reviewing the AT34C02-10TU-1.8-T datasheet, AT34C02-10TU-1.8-T pinout, AT34C02-10TU-1.8-T application, or AT34C02-10TU-1.8-T equivalent, key selection criteria include 1.8 V minimum supply compatibility, TSSOP-8 package footprint, irreversible software write protect capability, and WP-pin-controlled full-array hardware lock - critical for firmware parameter integrity in field-deployed embedded systems.

Technical Context

The AT34C02-10TU-1.8-T implements a true 2-wire (I²C) serial interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain SDA output. Its internal architecture includes an 8-bit address counter, page-addressable EEPROM array organized as 16 pages × 16 bytes, and dedicated write protect circuitry that enforces either first-half (software) or full-array (hardware) lock independently.

Write operations are self-timed with ≤5 ms cycle time; read modes include current-address, random-address, and sequential reads. The device uses a fixed 1010xxxR/W device address format (with A2–A0 hardwired), supports acknowledge polling during write cycles, and features built-in memory reset recovery after bus protocol interruption.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	2048 bits (256 words × 8 bits), organized as 16 pages of 16 bytes - enables efficient block-level configuration storage without external address latching.
Supply Voltage Range	1.8 V to 5.5 V - supports direct interfacing with 1.8 V logic families and mixed-voltage systems without level shifters.
I²C Clock Frequency	100 kHz max at 1.8 V - ensures reliable communication in low-power, noise-sensitive applications like battery-backed sensors.
Write Endurance	1 million write cycles - sufficient for daily firmware parameter updates over 27+ years of continuous operation.
Data Retention	100 years at +25°C - guarantees long-term calibration data integrity across product lifecycle without refresh.
Operating Temperature	−40°C to +85°C - qualified for industrial and automotive under-hood environments with thermal cycling stability.
Package	8-lead TSSOP (8A2), 3.0 mm × 4.4 mm body - compact surface-mount footprint compatible with high-density PCB layouts.

Pinout & Package

AT34C02-10TU-1.8-T is housed in an 8-lead Thin Shrink Small Outline Package (TSSOP-8, JEDEC MO-153 variation AA), 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, with exposed pad not present. Pin 1 is marked by a beveled corner or dot.

Pin/Terminal	Circuit Role	Design Meaning
A0–A2	Device Address Inputs	Hard-wired address bits enabling up to eight AT34C02 devices on one I²C bus; no external pull-up/down required for fixed addressing.
SDA	Serial Data I/O	Open-drain bidirectional line - requires external pull-up resistor; supports wire-OR with other I²C devices on shared bus.
SCL	Serial Clock Input	Positive-edge clock input for data sampling; Schmitt-triggered for robust noise immunity in electrically noisy environments.
WP	Hardware Write Protect Control	Active-high enable: tie to VCC to lock entire array; tie to GND or float to allow software-controlled partial protection.
VCC	Power Supply	1.8 V to 5.5 V tolerant - eliminates need for separate voltage regulators in multi-rail systems.
GND	Ground Reference	Common return path for all internal circuitry and I/O; must be low-impedance for stable EEPROM operation.

Key Features

Feature	Design Value
Permanent Software Write Protection	Irreversible lock of first 1K bits (00H–7FH) via 0110 control byte - prevents accidental or malicious overwrite of critical boot parameters.
Hardware Write Protect (WP pin)	Full-array lock when WP = VCC - provides system-level security independent of firmware state, ideal for factory calibration lockdown.
16-byte Page Write Mode	Reduces I²C transaction overhead by up to 15× vs. byte writes - accelerates bulk configuration updates in real-time control loops.
Self-timed Write Cycle (≤5 ms)	Eliminates need for external timing control or polling delay loops - simplifies host MCU firmware and improves deterministic response.
Low Standby Current (0.6 µA @ 1.8 V)	Enables always-on storage in energy-harvesting or coin-cell-powered devices - extends battery life beyond 10 years.
Automotive-Grade Qualification	Qualified per AEC-Q100 Grade 3 (−40°C to +85°C) - validated for use in body electronics, infotainment, and ADAS subsystems.

Applications

Industrial Sensor Calibration	Automotive Body Control Unit
Use Scenario: Storing temperature-compensated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding factory-trimmed calibration constants accessed at power-up and runtime. Use Value: Enables single-point calibration during manufacturing and field recalibration without firmware update - reduces test time and service cost.	Use Scenario: Retaining seat position memory, mirror angle settings, and lighting preferences across ignition cycles in premium vehicles. IC Role / Device Role / Timing Role: Persistent parameter store interfaced directly to 1.8 V microcontroller I²C port with WP pin tied to ignition-switched rail. Use Value: Hardware write protection prevents accidental erasure during ECU reprogramming; 100-year retention ensures lifetime data integrity.
Smart Energy Meter Firmware	Medical Diagnostic Device Settings
Use Scenario: Holding tariff tables, pulse constants, and tamper-detection flags in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure configuration vault with software write protect enabled for regulatory-critical fields and WP pin monitored for physical intrusion. Use Value: Dual-layer protection meets IEC 62056-21 security requirements; 1.8 V operation allows direct connection to ultra-low-power metrology SoCs.	Use Scenario: Saving user-defined measurement profiles, alarm thresholds, and calibration history in portable ultrasound and ECG analyzers. IC Role / Device Role / Timing Role: Medical-grade nonvolatile memory storing FDA-required audit trail data with guaranteed 100-year retention. Use Value: Eliminates need for battery-backed SRAM; TSSOP-8 package fits within tight space constraints of handheld enclosures.

Industrial Sensor Calibration

Automotive Body Control Unit

Use Scenario: Storing temperature-compensated offset/gain coefficients for analog sensor front-ends in programmable logic controllers.

IC Role / Device Role / Timing Role: Nonvolatile configuration register holding factory-trimmed calibration constants accessed at power-up and runtime.

Use Value: Enables single-point calibration during manufacturing and field recalibration without firmware update - reduces test time and service cost.

Use Scenario: Retaining seat position memory, mirror angle settings, and lighting preferences across ignition cycles in premium vehicles.

IC Role / Device Role / Timing Role: Persistent parameter store interfaced directly to 1.8 V microcontroller I²C port with WP pin tied to ignition-switched rail.

Use Value: Hardware write protection prevents accidental erasure during ECU reprogramming; 100-year retention ensures lifetime data integrity.

Smart Energy Meter Firmware

Medical Diagnostic Device Settings

Use Scenario: Holding tariff tables, pulse constants, and tamper-detection flags in ANSI C12.22-compliant electricity meters.

IC Role / Device Role / Timing Role: Secure configuration vault with software write protect enabled for regulatory-critical fields and WP pin monitored for physical intrusion.

Use Value: Dual-layer protection meets IEC 62056-21 security requirements; 1.8 V operation allows direct connection to ultra-low-power metrology SoCs.

Use Scenario: Saving user-defined measurement profiles, alarm thresholds, and calibration history in portable ultrasound and ECG analyzers.

IC Role / Device Role / Timing Role: Medical-grade nonvolatile memory storing FDA-required audit trail data with guaranteed 100-year retention.

Use Value: Eliminates need for battery-backed SRAM; TSSOP-8 package fits within tight space constraints of handheld enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
M95256-WMN6TP	256 Kbit SPI interface, 2.5–5.5 V supply, no software write protect - only hardware WP pin.	Larger capacity but incompatible bus protocol; requires SPI-capable MCU and additional GPIO for WP control.	Select when higher density and faster 10 MHz SPI access are needed, and I²C is unavailable.
24AA02E48-I/MS	2 Kbit I²C EEPROM with integrated EUI-48 MAC address; 1.8–5.5 V; same TSSOP-8 package and 100 kHz @ 1.8 V spec.	Includes factory-programmed unique identifier - adds traceability but occupies two reserved memory addresses.	Prefer when device serialization or network identity management is required alongside general-purpose storage.

Compared with M95256-WMN6TP and 24AA02E48-I/MS, the AT34C02-10TU-1.8-T uniquely combines irreversible software write protection, 1.8 V–optimized timing, and automotive-grade qualification in a minimal TSSOP-8 footprint - making it optimal for safety-critical parameter storage where bus simplicity and tamper resistance are prioritized over raw capacity or uniqueness.

Availability

AT34C02-10TU-1.8-T is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control units, and smart energy meter firmware requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for AT34C02-10TU-1.8-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 memory solutions, with a focus on reliability, longevity, and embedded system integration.

The AT34C02 series belongs to Microchip's legacy serial EEPROM portfolio designed for low-power, secure, and long-life nonvolatile storage in automotive, industrial, and consumer applications - emphasizing write protection robustness and wide voltage operation.

FAQ

What is the maximum I²C clock frequency supported by AT34C02-10TU-1.8-T at 1.8 V?

The AT34C02-10TU-1.8-T supports a maximum I²C clock frequency of 100 kHz when operating at 1.8 V. This is explicitly specified in the AC Characteristics table of the datasheet (Rev. 0958N) and reflects timing margins optimized for low-voltage noise immunity. At 2.7 V or 5.0 V, the device supports up to 400 kHz - but the AT34C02-10TU-1.8-T variant is rated and tested for 100 kHz at its minimum 1.8 V supply.

Can the software write protection on AT34C02-10TU-1.8-T be disabled after programming?

No, the software write protection on AT34C02-10TU-1.8-T is permanent and irreversible once enabled. Programming the write protect register using the 0110 control byte locks the first 1K bits (addresses 00H–7FH) permanently - even power cycling or reprogramming attempts will not clear it. This design ensures tamper-proof storage of critical firmware parameters, and the AT34C02-10TU-1.8-T datasheet explicitly states "cannot be reversed even if the device is powered down."

What package type does AT34C02-10TU-1.8-T use, and what are its key mechanical dimensions?

AT34C02-10TU-1.8-T uses an 8-lead TSSOP package (JEDEC MO-153, variation AA), designated as 8A2 in Microchip's ordering nomenclature. Its body measures 3.0 mm × 4.4 mm, with 0.65 mm lead pitch and 1.05 mm maximum height. Pin 1 is identified by a beveled corner or dot, and the package is lead-free and halogen-free - fully compliant with RoHS Directive 2011/65/EU.

How does hardware write protection interact with software write protection on AT34C02-10TU-1.8-T?

On AT34C02-10TU-1.8-T, hardware write protection (via the WP pin) and software write protection operate independently but hierarchically: when WP = VCC, the entire 2K array is locked regardless of software protection status; when WP = GND or floating, software protection determines whether only the first half (00H–7FH) or full array is writable. The AT34C02-10TU-1.8-T datasheet confirms this behavior in the Write Protection Modes table and Figure 1.

Is AT34C02-10TU-1.8-T qualified for automotive applications?

Yes, AT34C02-10TU-1.8-T is qualified for automotive applications per AEC-Q100 Grade 3 (−40°C to +85°C), as confirmed in the Ordering Information section and "Automotive Grade" feature bullet of the datasheet. It is specifically intended for body electronics, infotainment, and telematics modules - and its TSSOP-8 package, 1.8 V operation, and dual write protection make it suitable for ECU designs requiring long-term reliability and functional safety support.

AT34C02-10TU-1.8-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:: 2Kbit

Memory Organization:: 256 x 8

Memory Interface:: I2C

Clock Frequency:: 400 kHz

Write Cycle Time - Word, Page:: 5ms

Access Time:: 900 ns

Voltage - Supply:: 1.8V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TSSOP

AT34C02-10TU-1.8-T FAQ

1.How can I place an order for AT34C02-10TU-1.8-T through Aetrix?

Please submit a Request for Quotation (RFQ) for AT34C02-10TU-1.8-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 AT34C02-10TU-1.8-T reliable?

The price and inventory of AT34C02-10TU-1.8-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT34C02-10TU-1.8-T is usually 5 days.

3.What payment methods are accepted for AT34C02-10TU-1.8-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02-10TU-1.8-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT34C02-10TU-1.8-T?

AT34C02-10TU-1.8-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT34C02-10TU-1.8-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 AT34C02-10TU-1.8-T?

For technical support, including AT34C02-10TU-1.8-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02-10TU-1.8-T requirements.

6.How does Aetrix verify that AT34C02-10TU-1.8-T is sourced from the original manufacturer or authorized distributors?

All AT34C02-10TU-1.8-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 AT34C02-10TU-1.8-T meets industry standards.

7.What is the process for return or replacement of AT34C02-10TU-1.8-T?

All AT34C02-10TU-1.8-T units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02-10TU-1.8-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 AT34C02-10TU-1.8-T part is unused and in its original packaging.

Return procedure for AT34C02-10TU-1.8-T:

1.Submit a request within 90 days.

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

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