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

Microchip Technology AT34C02Y1-10YI-1.8

Name: AT34C02Y1-10YI-1.8
Brand: Microchip Technology
SKU: AT34C02Y1-10YI-1.8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT34C02Y1-10YI-1.8

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-VDFN Exposed Pad

Datasheet:: AT34C02Y1-10YI-1.8.pdf

Description:: IC EEPROM 2KBIT I2C 400KHZ 8MAP

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Product details

Overview

AT34C02Y1-10YI-1.8 from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) I²C-compatible serial EEPROM with dual write protection architecture, 1.8 V to 5.5 V operation, 16-byte page write capability, and automotive-grade industrial temperature range (−40°C to +85°C). It is housed in an 8-lead Miniature Array Package (MAP), optimized for space-constrained embedded systems requiring nonvolatile parameter storage.

For engineers reviewing the AT34C02Y1-10YI-1.8 datasheet, AT34C02Y1-10YI-1.8 pinout, AT34C02Y1-10YI-1.8 application, or AT34C02Y1-10YI-1.8 equivalent, key selection considerations include its permanent software write protect for first-half array (00H–7FH), hardware WP pin control for full-array protection, 100 kHz I²C speed at 1.8 V, 1 million write cycles endurance, and lead-free MAP package compatibility with high-density PCB layouts.

Technical Context

The AT34C02Y1-10YI-1.8 implements a two-wire (I²C) interface with Schmitt-trigger and noise-filtered inputs, supporting standard-mode (100 kHz) operation at 1.8 V supply. Its internal address counter enables current-address, random-address, and sequential read modes, while ACK polling allows host synchronization during self-timed 5 ms write cycles.

Write protection operates via two independent mechanisms: software-programmable lock of addresses 00H–7FH (irreversible, requires WP = GND/floating during programming), and hardware-enforced full-array lock via the WP pin tied to VCC. The device supports up to eight devices on one bus using A0–A2 address pins and uses 8-bit device addressing with control codes 1010 (normal ops) and 0110 (WP register access).

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 page-level firmware parameter updates without full-erase overhead.
Supply Voltage Range	1.8 V to 5.5 V - supports direct interfacing with ultra-low-power microcontrollers (e.g., ARM Cortex-M0+, PIC16LF) without level-shifting.
I²C Clock Frequency	100 kHz max at 1.8 V - ensures reliable communication in low-voltage, noise-sensitive environments such as battery-powered sensors.
Write Endurance	1,000,000 cycles - guarantees long-term reliability for frequently updated calibration data or runtime configuration storage.
Data Retention	100 years at +25°C - provides guaranteed nonvolatile storage integrity over product lifetime without refresh.
Operating Temperature	−40°C to +85°C - qualified for industrial control, automotive body electronics, and smart metering applications.
Standby Current	0.6 µA typical at 1.8 V - minimizes quiescent power draw in always-on edge nodes and IoT endpoints.

Pinout & Package

AT34C02Y1-10YI-1.8 is packaged in an 8-lead Miniature Array Package (MAP), measuring 4.90 mm × 3.00 mm with dual footprint compatibility and lead-free construction. This compact, surface-mount package supports high-density PCB layouts and automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
A0–A2	Device Address Inputs	Hard-wired address bits enabling up to eight AT34C02 devices on a single I²C bus; no external pull-up/down required for fixed addressing.
SDA	Serial Data Line	Bidirectional open-drain I/O - requires external pull-up resistor; supports wired-AND bus sharing with other I²C peripherals.
SCL	Serial Clock Input	Positive-edge clock input for data sampling; negative-edge used for data output - defines timing for all I²C transactions.
WP	Hardware Write Protect	Active-high enable for full-array lock; when tied to VCC, disables all writes regardless of software protection state - critical for fail-safe configuration lockdown.
GND	Ground Reference	Primary return path for VCC and signal currents; must be low-impedance to maintain noise immunity for I²C signaling.
VCC	Power Supply	Single-supply input supporting 1.8–5.5 V; internally regulated to power EEPROM core and interface logic - eliminates need for separate voltage rails.

Key Features

Feature	Design Value
Permanent Software Write Protection	Irreversibly locks first 1024 bits (00H–7FH) after one-time programming - prevents accidental or malicious corruption of critical boot parameters or security keys.
Hardware Write Protect Pin (WP)	Enables system-level write disable by tying WP to VCC - allows centralized protection during field firmware updates or safety-critical shutdown sequences.
16-byte Page Write Mode	Reduces write transaction count by 16× versus byte-write; cuts total programming time and I²C bus occupancy for multi-byte configuration blocks.
Schmitt Trigger & Noise Filtering	Rejects sub-100 ns glitches on SDA/SCL - ensures robust operation in electrically noisy environments like motor drives or power supplies.
Self-timed Write Cycle	Fixed 5 ms internal erase/write completion - eliminates need for host polling delay estimation; ACK polling provides deterministic synchronization.

Applications

Industrial Sensor Calibration	Automotive Body Control Module
Use Scenario: Storing factory-calibrated offset/gain coefficients and temperature compensation tables for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during power-up initialization and runtime correction lookups via I²C. Use Value: Enables field-replaceable sensor modules with persistent calibration data across power cycles and firmware updates - eliminating recalibration labor.	Use Scenario: Retaining user preferences (seat position, mirror angle, lighting profiles) and diagnostic trouble code (DTC) history in vehicle body control units. IC Role / Device Role / Timing Role: Low-power, high-reliability parameter memory interfaced to 1.8 V microcontroller I²C peripheral during sleep/wake transitions. Use Value: Guarantees 100-year data retention and 1M write cycles - supports 15+ year vehicle service life with daily user adjustments.
Smart Energy Metering	Medical Diagnostic Equipment
Use Scenario: Logging tariff schedules, billing cycle counters, and tamper-detection timestamps in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, write-protected event logger synchronized to real-time clock interrupts and metering ASIC registers. Use Value: Hardware WP pin + software lock ensures regulatory audit logs cannot be altered - meeting IEC 62056-21 integrity requirements.	Use Scenario: Storing FDA-mandated device calibration certificates, usage hours, and error log history in portable ultrasound or ECG analyzers. IC Role / Device Role / Timing Role: Certified nonvolatile memory for traceable operational records, accessed only during maintenance mode via isolated I²C bridge. Use Value: 100-year retention and −40°C to +85°C rating ensure compliance with ISO 13485 storage validation for Class II medical devices.

Industrial Sensor Calibration

Automotive Body Control Module

Use Scenario: Storing factory-calibrated offset/gain coefficients and temperature compensation tables for analog sensor front-ends in programmable logic controllers.

IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during power-up initialization and runtime correction lookups via I²C.

Use Value: Enables field-replaceable sensor modules with persistent calibration data across power cycles and firmware updates - eliminating recalibration labor.

Use Scenario: Retaining user preferences (seat position, mirror angle, lighting profiles) and diagnostic trouble code (DTC) history in vehicle body control units.

IC Role / Device Role / Timing Role: Low-power, high-reliability parameter memory interfaced to 1.8 V microcontroller I²C peripheral during sleep/wake transitions.

Use Value: Guarantees 100-year data retention and 1M write cycles - supports 15+ year vehicle service life with daily user adjustments.

Smart Energy Metering

Medical Diagnostic Equipment

Use Scenario: Logging tariff schedules, billing cycle counters, and tamper-detection timestamps in ANSI C12.20-compliant electricity meters.

IC Role / Device Role / Timing Role: Secure, write-protected event logger synchronized to real-time clock interrupts and metering ASIC registers.

Use Value: Hardware WP pin + software lock ensures regulatory audit logs cannot be altered - meeting IEC 62056-21 integrity requirements.

Use Scenario: Storing FDA-mandated device calibration certificates, usage hours, and error log history in portable ultrasound or ECG analyzers.

IC Role / Device Role / Timing Role: Certified nonvolatile memory for traceable operational records, accessed only during maintenance mode via isolated I²C bridge.

Use Value: 100-year retention and −40°C to +85°C rating ensure compliance with ISO 13485 storage validation for Class II medical devices.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MICROCHIP AT24C02C-SSHM-T	2 Kbit I²C EEPROM, 1.7–5.5 V, SOIC-8 package, no permanent software write protect - only hardware WP pin.	Lacks irreversible first-half array lock; suitable where dynamic reconfiguration of protected regions is required.	Select when full-array hardware protection suffices and MAP package size is not mandatory.
ON SEMICONDUCTOR CAT24C02HU4IGT3	2 Kbit I²C EEPROM, 1.8–5.5 V, TSSOP-8, includes software write protect but not permanent - register can be cleared.	Reversible software protection enables periodic reprogramming of secured zones; lower standby current (0.1 µA typical).	Choose for battery-powered applications needing ultra-low ISB and flexible protection policy management.

Compared with AT34C02Y1-10YI-1.8, AT24C02C-SSHM-T offers broader voltage tolerance but lacks irreversible software lock, while CAT24C02HU4IGT3 provides reprogrammable protection and lower quiescent current but uses larger TSSOP-8 packaging - making AT34C02Y1-10YI-1.8 optimal for space-constrained, tamper-evident industrial designs requiring permanent configuration lockdown.

Availability

AT34C02Y1-10YI-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, smart energy metering, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and lead-free RoHS-compliant packaging.

Supply support for AT34C02Y1-10YI-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, FPGA, and memory solutions, with a focus on embedded control and connectivity.

The AT34C02 series was designed for industrial and automotive applications demanding robust, low-voltage serial EEPROM with dual-layer write protection - targeting systems where configuration integrity and long-term data retention are mission-critical.

FAQ

What is the primary function of the WP pin on the AT34C02Y1-10YI-1.8?

The WP (Write Protect) pin on the AT34C02Y1-10YI-1.8 provides hardware-level write protection for the entire 2 Kbit memory array. When tied to VCC, it disables all write operations - including byte, page, and write-protect register programming - regardless of software protection status. This feature is essential for safeguarding configuration data during firmware updates or safety-critical system states. The AT34C02Y1-10YI-1.8 remains fully readable under WP = VCC.

Can the software write protection on the AT34C02Y1-10YI-1.8 be disabled after programming?

No, the software write protection on the AT34C02Y1-10YI-1.8 is permanent and irreversible once enabled. It locks the first 1024 bits (addresses 00H–7FH) against all future writes, even after power cycling or reset. Programming requires sending a special 0110 control code with WP = GND or floating; the device will not acknowledge subsequent attempts to clear this lock. This design ensures cryptographic keys or boot parameters stored in the protected region remain tamper-proof throughout the AT34C02Y1-10YI-1.8 lifetime.

What I²C clock speeds does the AT34C02Y1-10YI-1.8 support at 1.8 V operation?

The AT34C02Y1-10YI-1.8 supports I²C standard-mode operation up to 100 kHz when powered at 1.8 V. This speed is validated across the full industrial temperature range (−40°C to +85°C) and accounts for timing margins including tLOW = 4.7 µs, tHIGH = 4.0 µs, and tSU.STA = 4.7 µs. At higher supply voltages (2.7 V and 5.0 V), it supports fast-mode speeds up to 400 kHz. The AT34C02Y1-10YI-1.8 maintains full timing compliance without external acceleration circuitry.

How many devices can share the same I²C bus with the AT34C02Y1-10YI-1.8?

Up to eight AT34C02Y1-10YI-1.8 devices can operate on a single I²C bus using hard-wired A0, A1, and A2 address pins. These three pins form the device address bits within the mandatory 1010 base prefix, yielding eight unique 7-bit addresses (1010xxx). Each AT34C02Y1-10YI-1.8 responds only to its assigned address, enabling distributed parameter storage across multiple subsystems - for example, individual calibration memory per sensor channel in a modular AT34C02Y1-10YI-1.8-based acquisition system.

What is the maximum write cycle time for the AT34C02Y1-10YI-1.8, and how is it managed?

The maximum write cycle time for the AT34C02Y1-10YI-1.8 is 5 ms, covering internal erase and programming operations. During this period, all inputs are disabled and the device does not respond to I²C commands. Host systems synchronize using ACK polling: repeatedly issuing a START + device address until the AT34C02Y1-10YI-1.8 acknowledges, confirming write completion. This method avoids fixed delays and adapts to process variation - ensuring reliable timing across the full operating voltage and temperature range of the AT34C02Y1-10YI-1.8.

AT34C02Y1-10YI-1.8 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-VDFN Exposed Pad

Packaging:: Tube

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 (TC)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-MAP (3x4.9)

AT34C02Y1-10YI-1.8 FAQ

1.How can I place an order for AT34C02Y1-10YI-1.8 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT34C02Y1-10YI-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 AT34C02Y1-10YI-1.8 reliable?

The price and inventory of AT34C02Y1-10YI-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 AT34C02Y1-10YI-1.8 is usually 5 days.

3.What payment methods are accepted for AT34C02Y1-10YI-1.8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02Y1-10YI-1.8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT34C02Y1-10YI-1.8?

AT34C02Y1-10YI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT34C02Y1-10YI-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 AT34C02Y1-10YI-1.8?

For technical support, including AT34C02Y1-10YI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02Y1-10YI-1.8 requirements.

6.How does Aetrix verify that AT34C02Y1-10YI-1.8 is sourced from the original manufacturer or authorized distributors?

All AT34C02Y1-10YI-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 AT34C02Y1-10YI-1.8 meets industry standards.

7.What is the process for return or replacement of AT34C02Y1-10YI-1.8?

All AT34C02Y1-10YI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02Y1-10YI-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 AT34C02Y1-10YI-1.8 part is unused and in its original packaging.

Return procedure for AT34C02Y1-10YI-1.8:

1.Submit a request within 90 days.

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

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