Microchip Technology 34LC02T-E/MS

Overview

34LC02T-E/MS from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM with hardware and dual software write-protection, operating from 2.2V to 5.5V, supporting 1 MHz clock rate, 16-byte page write buffer, and rated for automotive temperature range (–40°C to +125°C) in MSOP-8 package. It serves as nonvolatile configuration storage in automotive body control modules requiring robust data integrity under voltage transients.

For engineers reviewing the 34LC02T-E/MS datasheet, 34LC02T-E/MS pinout, 34LC02T-E/MS application, or 34LC02T-E/MS equivalent, key selection criteria include its 1 MHz I²C speed at VCC ≥ 2.5V, permanent/resetttable software write-protect for lower 128 bytes, hardware WP pin for full-array protection, and automotive-grade reliability with >1 million erase/write cycles and >200 years data retention.

Technical Context

The 34LC02T-E/MS 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 implemented through three independent mechanisms: a hardware WP pin (VCC/VSS-tied), a resettable Software Write-Protect (SWP/CSWP) command set requiring high-voltage detection on A0, and a Permanent Software Write-Protect (PSWP) command that irreversibly locks addresses 00h–7Fh. All write operations - byte or page - trigger a self-timed internal erase/write cycle with typical duration of 3 ms.

Key Specifications

Pinout & Package

34LC02T-E/MS is housed in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm lead pitch, 3.0 mm × 3.0 mm body, and exposed pad option (not electrically connected). The package is Pb-free and RoHS compliant, optimized for space-constrained 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 34LC02T-E/MS uniquely delivers permanent software write-protection (PSWP) for factory calibration data, combined with automotive-grade temperature qualification and MSOP-8 space efficiency - making it the only option meeting strict ISO 26262 ASIL-B data integrity requirements for safety-critical configuration storage.

Availability

34LC02T-E/MS is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor nodes, medical infusion pumps, and smart energy meters requiring stable component supply across extended product lifecycles.

Supply support for 34LC02T-E/MS 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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 34LC02T-E/MS belongs to Microchip's automotive-qualified serial EEPROM product line, designed specifically for robust, secure, and long-life nonvolatile data storage in safety-critical automotive and industrial systems.

FAQ

What is the maximum I²C clock frequency supported by the 34LC02T-E/MS?

The 34LC02T-E/MS supports up to 1 MHz I²C clock frequency when VCC is 2.5V or higher. At lower voltages (e.g., 2.2V), the maximum clock rate drops to 400 kHz per AC specifications. This dual-speed capability ensures compatibility with both legacy 400 kHz systems and high-throughput automotive diagnostics interfaces requiring faster configuration writes.

How does the Permanent Software Write-Protect (PSWP) feature work in the 34LC02T-E/MS?

The PSWP feature in the 34LC02T-E/MS permanently locks addresses 00h–7Fh (lower 128 bytes) against all write attempts, including those initiated via software commands, power cycling, or WP pin state changes. Once executed, PSWP cannot be reversed, and the device stops acknowledging the '0110' device type identifier used for write-protect commands - ensuring immutable storage of factory calibration data.

Can the 34LC02T-E/MS be used in place of the 34AA02 in an existing design?

The 34LC02T-E/MS is not a direct drop-in replacement for the 34AA02 due to differing VCC ranges (34AA02: 1.7–5.5V; 34LC02T-E/MS: 2.2–5.5V) and clock performance (34AA02: max 400 kHz; 34LC02T-E/MS: up to 1 MHz). While pinout and basic I²C protocol are identical, designs operating below 2.2V or relying on 100 kHz timing margins must verify compatibility before substitution.

What package type is used for the 34LC02T-E/MS, and what are its key mechanical features?

The 34LC02T-E/MS uses an 8-lead MSOP (Micro Small Outline Package) with 3.0 mm × 3.0 mm body, 0.65 mm lead pitch, and gull-wing leads. It features a moisture-sensitive level (MSL) 1 rating, Pb-free matte tin plating, and RoHS compliance. The compact footprint supports high-density automotive PCB layouts while maintaining thermal and mechanical robustness under vibration and thermal cycling.

Does the 34LC02T-E/MS support page write operations, and what is the buffer size?

Yes, the 34LC02T-E/MS supports page write operations with a 16-byte internal buffer. This allows up to 16 consecutive bytes to be written in a single I²C transaction, significantly improving throughput versus byte-wise writes. Page boundaries align to 16-byte intervals (00h–0Fh, 10h–1Fh, etc.), and crossing boundaries causes wraparound - requiring firmware to manage alignment.