Microchip Technology AT34C02Y1-10YI-2.7

Overview

AT34C02Y1-10YI-2.7 from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) I²C-compatible serial EEPROM with permanent software write protection for the first 1K bits (00H–7FH), hardware write protection via WP pin, and operation across 2.7V to 5.5V supply. It supports 400 kHz clock frequency at 2.7V+, features 16-byte page writes, and is qualified for industrial temperature range (−40°C to +85°C) in an 8-lead Miniature Array Package (MAP).

For engineers reviewing the AT34C02Y1-10YI-2.7 datasheet, AT34C02Y1-10YI-2.7 pinout, AT34C02Y1-10YI-2.7 application, or AT34C02Y1-10YI-2.7 equivalent, key selection considerations include dual write-protection modes (software + hardware), 1M endurance cycles, 100-year data retention, low-power standby current (1.6 µA at 2.7V), and compatibility with space-constrained PCB layouts using the 4.90 mm × 3.00 mm MAP package.

Technical Context

The AT34C02Y1-10YI-2.7 implements a two-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, X/Y decoders, serial control logic, and dedicated write-protect circuitry that enforces irreversible software lock on addresses 00H–7FH when programmed with control code 0110.

Hardware write protection is managed by the WP pin: tied to VCC, it disables all writes to the full 2K array regardless of software protection status; tied to GND or floating, it permits selective protection based on the write-protect register state. The device supports byte and 16-byte page writes with self-timed 5 ms max write cycle and acknowledge polling for host synchronization.

Key Specifications

Pinout & Package

AT34C02Y1-10YI-2.7 is housed in an 8-lead Miniature Array Package (MAP), 4.90 mm × 3.00 mm body size, non-leaded, dual footprint compatible with SOIC and TSSOP land patterns. Pin 1 is marked by an index area on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT34C02Y1-10YI-2.7, the 24LC024T-I/OT offers broader voltage range but omits irreversible software protection, while the CAT24C02HU4IGT3 adds automotive qualification and higher temperature rating at the cost of larger TSSOP-8 footprint - both require PCB redesign if replacing the 4.90 mm × 3.00 mm MAP package.

Availability

AT34C02Y1-10YI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and smart energy metering requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for AT34C02Y1-10YI-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

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 was designed for industrial and automotive applications demanding robust nonvolatile storage with flexible, layered write protection - targeting systems where firmware integrity, field configurability, and long-term data retention are critical.

FAQ

What is the operating voltage range for AT34C02Y1-10YI-2.7?

The AT34C02Y1-10YI-2.7 operates from 2.7V to 5.5V, supporting direct interface with common 3.3V and 5V logic systems. This voltage range is confirmed in the DC Characteristics table of the official datasheet (Rev. 0958N), where VCC2 min is specified as 2.7V. Operation below 2.7V is not guaranteed and may result in incomplete write cycles or read errors.

Does AT34C02Y1-10YI-2.7 support I²C fast-mode speeds?

Yes, AT34C02Y1-10YI-2.7 supports 400 kHz clock frequency when VCC is 2.7V or higher, meeting I²C Fast Mode specification. This is explicitly stated in the AC Characteristics table under fSCL (Clock Frequency, SCL), with "2.7V, 5.0V" column listing 400 kHz as the maximum. At 1.8V operation, the limit is 100 kHz.

How does hardware write protection work on AT34C02Y1-10YI-2.7?

Hardware write protection on AT34C02Y1-10YI-2.7 is controlled by the WP pin: when tied to VCC, it disables all write operations to the entire 2K array, regardless of software protection status. When WP is grounded or floating, write access depends on the software write-protect register state. This behavior is defined in the "AT34C02 Write Protection Modes" table and verified in the "Hardware Write Protection" section of the datasheet.

What package type is used for AT34C02Y1-10YI-2.7?

AT34C02Y1-10YI-2.7 uses an 8-lead Miniature Array Package (MAP) with 4.90 mm × 3.00 mm body dimensions, non-leaded construction, and dual footprint compatibility. This is confirmed in the Ordering Information table (code "8Y1") and detailed in the 8Y1 packaging drawing (Rev. 0958N, page 18), which specifies D = 4.70–5.10 mm and E = 2.80–3.20 mm.

Can AT34C02Y1-10YI-2.7 be used in automotive applications?

AT34C02Y1-10YI-2.7 is qualified for industrial temperature range (−40°C to +85°C) and meets lead-free requirements, making it suitable for many automotive cabin and chassis applications. However, it is not AEC-Q100 qualified. For under-hood or safety-critical automotive use, Microchip's automotive-grade variants (e.g., AT34C02N-10SE-2.7, rated to +125°C) or alternatives like ON Semiconductor's CAT24C02HU4IGT3 should be considered.