Microchip Technology AT34C02N-10SI-1.8

Overview

AT34C02N-10SI-1.8 from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) serial EEPROM with permanent software write protection for the first 1 Kbit and hardware write protection via the WP pin. It operates from 1.8 V to 5.5 V, supports 100 kHz I²C communication at 1.8 V, features 16-byte page writes, and delivers 1 million write cycles with 100-year data retention. It is used in industrial sensor calibration storage and embedded system configuration memory.

For engineers reviewing the AT34C02N-10SI-1.8 datasheet, AT34C02N-10SI-1.8 pinout, AT34C02N-10SI-1.8 application, or AT34C02N-10SI-1.8 equivalent, key selection considerations include its 1.8 V minimum supply, dual write-protection architecture, SOIC-8 package compatibility, and automotive-grade temperature range (–40°C to +85°C).

Technical Context

The AT34C02N-10SI-1.8 implements a two-wire (I²C-compatible) serial interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. Its internal architecture includes an 8-bit address counter, X/Y decoders, and dedicated write-protect circuitry that enforces irreversible software locking of addresses 00H–7FH when enabled.

Hardware write protection is controlled by the WP pin: tied to VCC, it disables all writes to the full 2 Kbit array regardless of software protection status; tied to GND or floating, it permits writes unless software protection is active. The device supports byte and 16-byte page writes with self-timed 5 ms max write cycles and acknowledge polling for completion detection.

Key Specifications

Pinout & Package

AT34C02N-10SI-1.8 is supplied in an 8-lead JEDEC SOIC (8S1) package, 0.150" wide, with gull-wing leads and standard 1.27 mm pitch. Pin 1 is marked by a notch or bevel on the package top edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95020-WMN6TP and 24AA02E48-I/SN, the AT34C02N-10SI-1.8 uniquely combines I²C compatibility, 1.8 V operation, and dual-layer write protection - enabling both factory-set immutable parameters and field-configurable data in a single device.

Availability

AT34C02N-10SI-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration memory, and automotive body control modules requiring stable component supply and long-term data integrity.

Supply support for AT34C02N-10SI-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 reliability and long-term product support.

The AT34C02N-10SI-1.8 belongs to Microchip's legacy serial EEPROM product line, designed for cost-sensitive, low-power embedded systems needing robust nonvolatile storage with flexible write protection.

FAQ

What is the minimum operating voltage for AT34C02N-10SI-1.8?

The AT34C02N-10SI-1.8 is rated for operation down to 1.8 V, with guaranteed 100 kHz I²C communication performance at this voltage. Its DC characteristics - including standby current (0.6 µA typical at 1.8 V) and VOL (0.2 V max at 0.15 mA load) - are fully specified across the 1.8 V to 5.5 V range. This makes AT34C02N-10SI-1.8 suitable for battery-powered or energy-harvesting systems where supply rails dip near 1.8 V.

How does hardware write protection work on AT34C02N-10SI-1.8?

Hardware write protection on AT34C02N-10SI-1.8 is controlled by the WP pin: when tied to VCC, it disables all write operations to the full 2 Kbit array regardless of software protection status. When WP is grounded or left floating, write access depends solely on whether the software write protect register has been programmed. AT34C02N-10SI-1.8's dual-mode scheme allows layered security - e.g., factory-locking calibration data while permitting field updates to user settings.

Can AT34C02N-10SI-1.8 perform partial page writes?

Yes, AT34C02N-10SI-1.8 supports partial page writes: after initiating a page write sequence, the host may transmit fewer than 16 bytes before issuing a STOP condition. The device increments the internal address counter automatically and writes only the received bytes within the target 16-byte page boundary. Unwritten locations in the page retain their prior values. This capability reduces I²C traffic when updating scattered configuration fields without overwriting adjacent data in AT34C02N-10SI-1.8.

What is the endurance rating of AT34C02N-10SI-1.8?

The AT34C02N-10SI-1.8 is rated for 1,000,000 write cycles per memory location under specified conditions (5.0 V, 25°C, page mode). This endurance level supports frequent updates in applications like usage logging or adaptive calibration. Endurance is maintained across the full operating temperature range (–40°C to +85°C), and wear leveling is not required since AT34C02N-10SI-1.8 uses standard EEPROM cell architecture without internal mapping logic.

Is AT34C02N-10SI-1.8 compatible with standard I²C protocols?

Yes, AT34C02N-10SI-1.8 implements a standard two-wire serial interface fully compliant with I²C protocol timing and electrical requirements. It supports standard START/STOP conditions, 7-bit slave addressing (with A0–A2 pins defining the lower 3 bits), ACK/NACK handshaking, and 8-bit data transfers. Its AC characteristics - including tLOW (4.7 µs min at 1.8 V), tHD.STA (4.0 µs min), and tSU.DAT (200 ns min) - meet I²C specification margins for standard-mode (100 kHz) operation at 1.8 V.