Microchip Technology 34LC02T-I/MS

Overview

34LC02T-I/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 up to 1 MHz clock frequency, and housed in an 8-lead MSOP package rated for -40°C to +85°C industrial temperature range. It delivers 16-byte page writes, 100 nA standby current, and >1 million erase/write cycles - used in embedded system configuration storage where robust nonvolatile data retention and flexible protection are required.

For engineers reviewing the 34LC02T-I/MS datasheet, 34LC02T-I/MS pinout, 34LC02T-I/MS application, or 34LC02T-I/MS equivalent, key selection criteria include its 1 MHz I²C speed (vs. 400 kHz for AA variants), MSOP-8 package footprint, industrial-grade temperature rating, and dual-layer write-protection architecture enabling selective or full-array lockout.

Technical Context

The 34LC02T-I/MS implements a 256 × 8-bit memory array accessed via a bidirectional 2-wire I²C bus, functioning exclusively as a slave device synchronized to an external master's SCL clock. Its internal address pointer supports current-address, random, and sequential read modes, while write operations use either byte or 16-byte page buffering with self-timed erase/write cycles.

Write protection is enforced at three levels: hardware (WP pin tied to VCC), resettable software (SWP/CSWP commands), and permanent software (PSWP command) - all targeting the lower 128 bytes (00h–7Fh). Schmitt-trigger inputs on SDA/SCL and input filtering suppress noise, and a VCC threshold detector disables programming below 1.35V to prevent brown-out corruption.

Key Specifications

Pinout & Package

34LC02T-I/MS is supplied in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm lead pitch, measuring 3.0 mm × 3.0 mm × 1.0 mm - optimized for space-constrained PCB layouts while maintaining hand-solderability and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 34LC02T-I/MS, the 34AA02T-I/MS trades 1 MHz speed for sub-2.2V operation, while the AT24C02D-MAHM-T omits PSWP and requires revalidation of protection routines - making 34LC02T-I/MS optimal for new designs needing high-speed, tamper-resistant configuration storage.

Availability

34LC02T-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart home gateway settings requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 34LC02T-I/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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions for embedded control applications.

The 34LC02 belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, and secure nonvolatile data storage in resource-constrained embedded systems with stringent write-protection requirements.

FAQ

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

The 34LC02T-I/MS supports up to 1 MHz I²C clock frequency when VCC is 2.5V or higher. At lower voltages (2.2V ≤ VCC < 2.5V), it operates at 400 kHz. This 1 MHz capability enables faster configuration reads and writes compared to standard 400 kHz EEPROMs, reducing boot-time latency in time-critical applications. The 34LC02T-I/MS datasheet confirms this specification in Table 1-2 under FCLK parameter.

Does the 34LC02T-I/MS support permanent write protection of memory contents?

Yes, the 34LC02T-I/MS supports Permanent Software Write-Protect (PSWP), which irreversibly locks the lower 128 bytes (00h–7Fh) against any future write attempts - even after power cycling or WP pin changes. Once PSWP is executed, the device no longer acknowledges the '0110' device identifier used for protection commands. This feature is documented in Section 7.3 and Table 7-1 of the 34LC02T-I/MS datasheet.

What package type and dimensions does the 34LC02T-I/MS use?

The 34LC02T-I/MS is packaged in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm lead pitch, measuring 3.0 mm × 3.0 mm × 1.0 mm. Pin 1 is marked with a dot, and the package is RoHS-compliant and Pb-free. This compact surface-mount footprint is ideal for space-constrained PCBs while maintaining solder joint reliability. The 34LC02T-I/MS package details are specified in Section 9.0 and Figure 9-1 of the official datasheet.

How does hardware write protection work on the 34LC02T-I/MS?

Hardware write protection on the 34LC02T-I/MS is controlled by the WP (Write-Protect) pin: when tied to VCC, the entire 256-byte memory array becomes read-only, overriding all software protection states. When WP is tied to VSS, hardware protection is disabled and software-based protection (SWP/PSWP) takes effect. This pin-level control provides fail-safe, firmware-independent memory lockout. The behavior is defined in Section 7.1 and Table 8-1 of the 34LC02T-I/MS datasheet.

What is the endurance and data retention specification for the 34LC02T-I/MS?

The 34LC02T-I/MS guarantees ≥1 million erase/write cycles and >200 years of data retention at 25°C. Endurance is characterized at 25°C and VCC = 5.5V in block mode; retention is extrapolated from accelerated testing per JEDEC standards. These values ensure long-term reliability in applications requiring frequent field updates or decades-long unpowered storage. Both specifications are listed in Table 1-2 (Note 4) and Section 1.0 of the 34LC02T-I/MS datasheet.