Microchip Technology AT34C02-10TI

Overview

AT34C02-10TI from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) serial EEPROM with permanent software write protection for the first-half array (00H–7FH), hardware write protection via WP pin, and 2-wire I²C-compatible interface. It operates across 2.7V to 5.5V, supports 400 kHz clock rate at 2.7V+, delivers 1 million write cycles and 100-year data retention, and is qualified for industrial temperature range (−40°C to +85°C). It is used in embedded systems requiring nonvolatile parameter storage with dual-layer data integrity.

For engineers reviewing the AT34C02-10TI datasheet, AT34C02-10TI pinout, AT34C02-10TI application, or AT34C02-10TI equivalent, key selection considerations include its 8-pin TSSOP package, WP pin-controlled full-array hardware lock, irreversible software write protect for lower 1K, 16-byte page write capability, and compatibility with I²C-bus timing at 400 kHz under industrial voltage/temperature conditions.

Technical Context

The AT34C02-10TI implements a true 2-wire serial interface compliant with standard I²C protocol, supporting START/STOP conditions, ACK polling, and bidirectional SDA with open-drain drive. Its internal architecture includes an 8-bit address counter, page-addressed EEPROM array, and dedicated write protect circuitry that enforces either full-array (WP = VCC) or first-half-only (software-programmed) protection modes.

It features Schmitt-trigger and noise-filtered inputs for robust operation in electrically noisy environments, and uses internally timed write cycles (max 10 ms) with automatic input disable during programming. The device supports partial page writes and retains address counter state across read/write operations without power loss.

Key Specifications

Pinout & Package

AT34C02-10TI is supplied in an 8-lead TSSOP package (package code 8T), measuring 3.10 mm × 4.50 mm × 1.20 mm max height, with gull-wing leads and 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95256-DW and 24LC024T-I/OT, the AT34C02-10TI uniquely combines I²C interface, industrial temperature rating, 100-year retention, and irreversible software write protection-making it optimal for safety- or security-sensitive parameter storage where legacy Atmel design continuity matters.

Availability

AT34C02-10TI is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, smart energy meter firmware, and medical infusion pump settings requiring stable component supply across extended product lifecycles.

Supply support for AT34C02-10TI 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 broad industrial and automotive qualification capabilities.

The AT34C02 series was designed as a drop-in upgrade path for legacy Atmel 2K I²C EEPROMs, emphasizing dual write-protection mechanisms, extended temperature reliability, and compatibility with low-voltage microcontroller systems.

FAQ

What is the maximum I²C clock frequency supported by the AT34C02-10TI?

The AT34C02-10TI supports up to 400 kHz I²C clock frequency when operating at 2.7V or higher. At 1.8V operation (not applicable to this -10TI variant), the maximum clock rate drops to 100 kHz. This 400 kHz capability enables efficient parameter reads/writes in real-time embedded systems without bus contention delays.

Does the AT34C02-10TI support partial page writes?

Yes, the AT34C02-10TI supports partial page writes within its 16-byte page boundary. Host controllers can transmit fewer than 16 bytes after the initial address byte, and the internal address counter increments automatically. This avoids unnecessary overwrites and simplifies small-data updates such as single-register configuration changes in the AT34C02-10TI's memory map.

How does hardware write protection interact with software write protection in the AT34C02-10TI?

In the AT34C02-10TI, hardware write protection (via WP pin = VCC) overrides software write protection and locks the entire 2K array regardless of whether the software lock is enabled. When WP = GND or floating, software protection determines access: if programmed, only addresses 80H–FFH remain writable; if unprogrammed, full array access is permitted. Both mechanisms coexist but are hierarchically enforced.

What package type is used for the AT34C02-10TI?

The AT34C02-10TI uses an 8-lead TSSOP package (JEDEC MO-153, package code 8T), with 0.65 mm lead pitch, 3.10 mm × 4.50 mm body size, and gull-wing leads. This surface-mount package provides space savings and thermal performance suitable for dense industrial PCB layouts while maintaining hand-soldering feasibility.

Can the software write protection on the AT34C02-10TI be disabled after programming?

No-the software write protection on the AT34C02-10TI is permanent and irreversible once enabled. Sending the 0110 control code with WP pin low programs the internal register, locking addresses 00H–7FH indefinitely-even after power cycling or reprogramming attempts. This design ensures critical calibration or security data cannot be altered in the field without physical replacement of the AT34C02-10TI.