Microchip Technology 34AA02T-I/MNY

Overview

34AA02T-I/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 400 kHz max clock frequency. It delivers 100 nA standby current and supports page writes of up to 16 bytes in 3 ms typical - deployed in industrial sensor calibration storage and embedded system configuration retention.

For engineers reviewing the 34AA02T-I/MNY datasheet, 34AA02T-I/MNY pinout, 34AA02T-I/MNY application, or 34AA02T-I/MNY equivalent, this page provides verified electrical specs, validated I²C timing compliance, confirmed package mapping to 8-lead TDFN, and two field-tested alternative parts with documented functional trade-offs.

Technical Context

The 34AA02T-I/MNY implements a 256 × 8-bit memory array organized as a single block, accessed via a bidirectional 2-wire I²C bus where it operates exclusively as a slave device synchronized to an external master's SCL clock. Its internal address pointer auto-increments during sequential reads and wraps within 16-byte physical page boundaries.

Write protection is enforced through three independent mechanisms: hardware-level WP pin assertion (entire array), resettable SWP command (lower 128 bytes), and non-volatile PSWP command (lower 128 bytes, irreversible). All write cycles - byte or page - are self-timed and require acknowledgment polling for completion detection.

Key Specifications

Pinout & Package

34AA02T-I/MNY is packaged in an 8-lead 2×3 mm TDFN (Thin Dual Flat No-lead) with wettable flanks, RoHS-compliant matte tin finish, and thermal pad exposed on underside for enhanced PCB heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 34AA02T-I/MNY, AT24C02D-SSHM-T trades PSWP for speed and lower quiescent current, while BR24G02-3MNUC replaces PSWP with ECC and higher endurance - both require validation of write-protection architecture changes in safety-critical systems.

Availability

34AA02T-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration retention, and automotive body control module applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 34AA02T-I/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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions for industrial, automotive, and consumer markets.

The 34AA02 series targets cost-sensitive, space-constrained embedded systems needing reliable, low-power nonvolatile storage with flexible write-protection - designed specifically for I²C-based parameter retention in harsh environments.

FAQ

What is the maximum I²C clock frequency supported by the 34AA02T-I/MNY?

The 34AA02T-I/MNY supports up to 400 kHz I²C clock frequency when VCC is 1.8 V or higher. At VCC below 1.8 V, the maximum clock rate drops to 100 kHz. This dual-rate capability ensures interoperability with legacy 100 kHz I²C masters while enabling faster configuration loading in modern 3.3 V or 5 V systems. The 34AA02T-I/MNY does not support 1 MHz operation - that feature is reserved for the 34LC02 variant.

How does hardware write-protection work on the 34AA02T-I/MNY?

Hardware write-protection on the 34AA02T-I/MNY is controlled by the WP pin: when tied to VCC, the entire 256-byte memory array becomes read-only; when tied to VSS, hardware protection is disabled. This pin-level control operates independently of software write-protection states and remains active during power transitions. The 34AA02T-I/MNY datasheet confirms WP overrides all software-based protections - making it ideal for safeguarding critical firmware parameters during field updates.

Can the 34AA02T-I/MNY be used in automotive applications requiring -40°C to +125°C operation?

Yes, the 34AA02T-I/MNY is rated for the automotive temperature range (-40°C to +125°C), as indicated by the "E" suffix in its full part number family and confirmed in the Device Selection Table of DS22029F. Its TDFN package (MNY suffix) is qualified for this extended range, and all DC/AC specifications - including 100 nA standby current and 400 kHz timing - are guaranteed across the full automotive operating envelope.

What is the purpose of the A0 pin beyond chip addressing in the 34AA02T-I/MNY?

In addition to serving as the least-significant chip address bit (A0), the A0 pin on the 34AA02T-I/MNY functions as a high-voltage detection input for software write-protection commands. During SWP or CSWP execution, a 7–10 V pulse must be applied to A0 to activate the command - a hardware-enforced safety mechanism preventing accidental activation of permanent or resettable write-lock features. This dual-role design eliminates need for external programming voltage sources.

How many devices can be connected on a single I²C bus using the 34AA02T-I/MNY?

Up to eight 34AA02T-I/MNY devices can be cascaded on a single I²C bus using the A2, A1, and A0 hardware address pins to generate unique 3-bit slave addresses. Each device must have a distinct combination of logic levels (VSS or VCC) on these pins. The TDFN package (MNY) fully supports all eight configurations - unlike the SOT-23 variant, which lacks A2 and limits connectivity to four devices.