Microchip Technology 34AA02T-E/MNY

Overview

34AA02T-E/MNY from Microchip Technology is a 2 Kbit I²C-compatible serial EEPROM with permanent and resettable software write-protection for the lower 128 bytes (00h–7Fh), hardware write-protection via WP pin, 1.7V to 5.5V single-supply operation, and 100 nA typical standby current. It supports up to eight cascaded devices on one bus and is used in automotive infotainment control modules for storing calibrated sensor offsets and configuration data.

For engineers reviewing the 34AA02T-E/MNY datasheet, 34AA02T-E/MNY pinout, 34AA02T-E/MNY application, or 34AA02T-E/MNY equivalent, key selection criteria include its -40°C to +125°C automotive temperature rating, 400 kHz I²C clock compatibility at VCC ≥ 1.8V, 16-byte page write buffer, and dual-layer write protection architecture enabling secure firmware parameter storage.

Technical Context

The 34AA02T-E/MNY implements a 2-wire I²C slave interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its memory array is organized as 256 × 8-bit with an internal address pointer supporting current-address, random, and sequential read modes.

Write protection operates at three levels: hardware (WP pin tied to VCC disables all writes), resettable software (SWP/CSWP commands protect addresses 00h–7Fh), and permanent software (PSWP command irreversibly locks the same 128-byte region). All write cycles - byte or page - are self-timed with 5 ms maximum duration and require acknowledge polling for completion detection.

Key Specifications

Pinout & Package

34AA02T-E/MNY is packaged in an 8-lead TDFN (2 mm × 3 mm, 0.5 mm pitch) with wettable flanks, optimized for automated optical inspection and high-density automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02D-SSHM-T and BR24G02FJ-3GE2, the 34AA02T-E/MNY uniquely delivers permanent software write-protection (PSWP) for regulatory-compliant calibration locking, while maintaining identical 400 kHz timing and 100 nA standby current - making it the only choice for automotive ASIL-B–aligned configuration storage.

Availability

34AA02T-E/MNY is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor calibration modules, medical device configuration backup, and smart energy meter security key storage requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 34AA02T-E/MNY 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 Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and development tools.

The 34AA02T-E/MNY belongs to Microchip's 34XX02 family of automotive-grade serial EEPROMs, designed specifically for secure, low-power, and noise-immune nonvolatile storage in harsh environments where data integrity and write-protection assurance are critical.

FAQ

What is the operating temperature range of the 34AA02T-E/MNY?

The 34AA02T-E/MNY is rated for the automotive temperature range of -40°C to +125°C, validated per AEC-Q100 Grade 1 requirements. This ensures reliable operation in engine bay, transmission control, and ADAS subsystems where ambient thermal stress exceeds industrial-grade limits. The 34AA02T-E/MNY maintains full I²C functionality and write-protection behavior across this full range.

How does the permanent software write-protection (PSWP) function in the 34AA02T-E/MNY?

The PSWP command in the 34AA02T-E/MNY permanently locks addresses 00h–7Fh against all future writes, including those attempted via SWP/CSWP or hardware WP override. Once executed, PSWP cannot be reversed by power cycling, firmware reset, or any command sequence. The 34AA02T-E/MNY will no longer acknowledge the '0110' device identifier used for write-protection commands after PSWP activation.

Can the 34AA02T-E/MNY be used with a 1.8V microcontroller I²C interface?

Yes, the 34AA02T-E/MNY supports full 400 kHz I²C operation at VCC = 1.8V, meeting standard-mode timing requirements (THIGH ≥ 600 ns, TLOW ≥ 1300 ns). Its Schmitt-trigger SDA/SCL inputs and 0.7VCC VIH threshold ensure robust signal recognition with 1.8V logic levels, eliminating need for external level shifters in mixed-voltage systems.

What package type is used for the 34AA02T-E/MNY?

The 34AA02T-E/MNY uses an 8-lead TDFN (Thin Dual Flat No-lead) package measuring 2 mm × 3 mm with 0.5 mm pitch and wettable flanks. This compact, thermally efficient package supports automated optical inspection and meets IPC/JEDEC standards for solder joint reliability in automotive reflow profiles.

Does the 34AA02T-E/MNY support page write operations, and what is the buffer size?

Yes, the 34AA02T-E/MNY supports page write operations with a 16-byte internal buffer. This allows up to 16 contiguous bytes to be written in a single I²C transaction, reducing bus overhead by 94% compared to individual byte writes. Page boundaries align to 16-byte intervals (00h–0Fh, 10h–1Fh, etc.), and crossing boundaries causes wraparound within the current page.