Microchip Technology AT34C02-10TC-2.7

Overview

AT34C02-10TC-2.7 from Atmel (now Microchip) is a 2 Kbit (256 × 8) serial EEPROM with permanent software write protection for the first 1K (00H–7FH) and hardware write protection via the WP pin. It operates from 2.7V to 5.5V, supports 400 kHz I²C communication at ≥2.7V, features 16-byte page writes, and delivers 1 million write cycles with 100-year data retention. It is used in industrial control systems for calibration storage and configuration backup.

For engineers reviewing the AT34C02-10TC-2.7 datasheet, AT34C02-10TC-2.7 pinout, AT34C02-10TC-2.7 application, or AT34C02-10TC-2.7 equivalent, key selection considerations include its dual write-protection scheme, TSSOP-8 package compatibility, 2.7V–5.5V supply range, and guaranteed 10 ms max write cycle time under industrial temperature conditions.

Technical Context

The AT34C02-10TC-2.7 implements a standard 2-wire (I²C-compatible) serial interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. Its internal architecture includes an 8-bit address counter, Y/X decoders, and dedicated write-protect circuitry that enforces irreversible software lock on addresses 00H–7FH when programmed.

Hardware write protection is controlled solely by the WP pin: tied to VCC it locks the full 2K array; tied to GND or floating enables conditional access based on software protection status. The device uses open-drain SDA with wire-OR capability and supports acknowledge polling to detect write completion without fixed timing delays.

Key Specifications

Pinout & Package

AT34C02-10TC-2.7 is housed in an 8-lead TSSOP package (package code 8T), measuring 3.0 mm × 4.4 mm × 1.2 mm max height, with 0.65 mm lead pitch and gull-wing leads suitable for automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95256-WMN6TP and 24LC024T-I/OT, the AT34C02-10TC-2.7 uniquely combines I²C compatibility, TSSOP-8 footprint, and dual-layer (software + hardware) write protection - making it optimal for space-constrained, safety-critical calibration storage where permanent factory data integrity is mandatory.

Availability

AT34C02-10TC-2.7 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and automotive body electronics requiring stable component supply across extended temperature and long product lifecycles.

Supply support for AT34C02-10TC-2.7 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

Atmel Corporation, now part of Microchip Technology, designs high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and consumer applications.

The AT34C02 product line delivers cost-effective, pin-compatible serial EEPROMs optimized for low-power, low-voltage embedded systems requiring robust data retention and flexible write protection schemes.

FAQ

What is the operating voltage range for the AT34C02-10TC-2.7?

The AT34C02-10TC-2.7 operates from 2.7V to 5.5V DC. This wide supply range allows direct integration with both 3.3V and 5V microcontrollers without level-shifting circuitry. Its specified performance - including 400 kHz I²C speed and 10 ms max write cycle - is guaranteed across this full range, making the AT34C02-10TC-2.7 suitable for applications experiencing brown-out conditions or mixed-voltage system designs.

How does software write protection work on the AT34C02-10TC-2.7?

Software write protection on the AT34C02-10TC-2.7 is enabled by sending a special command (device address 0110) with WP pin low. Once programmed, it permanently locks addresses 00H–7FH (first 1K bits); this state persists through power cycles and cannot be reversed. The AT34C02-10TC-2.7 will not acknowledge further write attempts to this region, ensuring factory calibration data remains tamper-proof throughout the device's lifetime.

Can the AT34C02-10TC-2.7 be used in automotive applications?

Yes - the AT34C02-10TC-2.7 is qualified for commercial temperature range (0°C to +70°C), and automotive-grade variants (e.g., AT34C02-10TI-2.7) extend operation to −40°C to +85°C. Its 100-year data retention, 1 million write cycles, and >3000V HBM ESD rating meet core reliability requirements for body electronics and infotainment subsystems. The AT34C02-10TC-2.7 itself is suited for cabin-located modules where ambient temperatures remain within commercial limits.

What package type does the AT34C02-10TC-2.7 use?

The AT34C02-10TC-2.7 uses an 8-lead Thin Shrink Small Outline Package (TSSOP), designated as package code 8T. Its dimensions are 3.0 mm × 4.4 mm × 1.2 mm max height, with 0.65 mm lead pitch and gull-wing leads. This compact, surface-mount package supports high-density PCB layouts and is compatible with standard reflow soldering profiles, making the AT34C02-10TC-2.7 ideal for space-constrained industrial and portable electronics.

Does the AT34C02-10TC-2.7 support page write operations?

Yes - the AT34C02-10TC-2.7 supports 16-byte page write mode. After sending the initial word address and first data byte, the host can transmit up to 15 additional bytes without issuing new addresses; the internal address counter auto-increments within the 16-byte boundary. This reduces I²C bus overhead and accelerates bulk configuration writes. The AT34C02-10TC-2.7 completes the full page write in a single self-timed cycle (≤10 ms), maintaining deterministic timing behavior.