Microchip Technology 34LC02T-E/OT

Overview

34LC02T-E/OT from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM with hardware and dual software write-protection, 1 MHz clock support at 2.5–5.5 V, 16-byte page write buffer, and 1 million erase/write cycles. It operates across -40°C to +125°C and is used for secure parameter storage in automotive body control modules.

For engineers reviewing the 34LC02T-E/OT datasheet, 34LC02T-E/OT pinout, 34LC02T-E/OT application, or 34LC02T-E/OT equivalent, this page delivers verified electrical specs, validated I²C timing behavior, confirmed write-protection logic (SWP/PSWP/WP), package-specific pin mapping for SOT-23, and real-world substitution guidance for industrial and automotive designs.

Technical Context

The 34LC02T-E/OT implements a 2-wire I²C slave interface with Schmitt-trigger inputs, slope-controlled outputs, and internal address pointer for sequential reads. Its memory array is organized as 256 × 8-bit with hardware write-protection via WP pin and two software-based protections-resettable SWP and permanent PSWP-for addresses 00h–7Fh.

It supports cascading up to eight devices using A2/A1/A0 address bits (A2 unconnected in SOT-23), uses acknowledge polling to detect write completion, and enforces strict page-boundary alignment during 16-byte page writes to prevent data wraparound.

Key Specifications

Pinout & Package

34LC02T-E/OT is supplied in a Pb-free, RoHS-compliant 6-lead SOT-23 package (JEDEC MO-178AA). Pin 1 = SCL, Pin 2 = VSS, Pin 3 = SDA, Pin 4 = A1, Pin 5 = A0, Pin 6 = VCC. A2 and WP pins are not bonded in this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 34LC02T-E/OT, AT24C02D-SSHM-T omits permanent write-protection and AEC-Q100 compliance, while BR24G02-3SER matches functionality but lacks automotive temperature and qualification coverage - making 34LC02T-E/OT the sole option meeting full automotive E-grade and PSWP requirements.

Availability

34LC02T-E/OT is available at Aetrix Electronics and suitable for automotive body control, industrial PLC configuration, telematics unit security, and medical device calibration requiring stable component supply across extended temperature and long product lifecycles.

Supply support for 34LC02T-E/OT 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 manufacturer specializing in microcontrollers, analog devices, and memory products, with global design and manufacturing infrastructure.

The 34LC02 series targets automotive and industrial systems requiring robust, secure, and temperature-hardened nonvolatile storage - designed specifically for mission-critical parameter retention in harsh environments.

FAQ

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

The 34LC02T-E/OT supports up to 1 MHz I²C clock frequency when VCC is 2.5 V or higher. At lower voltages (e.g., 2.2 V), timing margins tighten but remain compliant per AC specification Table 1-2. This 1 MHz capability is a key differentiator from the 34AA02 variant, which is limited to 400 kHz.

Does the 34LC02T-E/OT have permanent write protection, and how is it activated?

Yes, the 34LC02T-E/OT supports Permanent Software Write-Protect (PSWP) for addresses 00h–7Fh. It is activated by sending the PSWP instruction (Device Type Identifier '0110', specific A2/A1/A0 levels, R/W = 0) - once executed, it cannot be cleared by power cycling, commands, or WP pin state. The 34LC02T-E/OT will no longer acknowledge '0110' after PSWP activation.

What package type is used for the 34LC02T-E/OT, and which pins are functional?

The 34LC02T-E/OT uses a 6-lead SOT-23 package (MO-178AA). Functional pins are: Pin 1 = SCL, Pin 2 = VSS, Pin 3 = SDA, Pin 4 = A1, Pin 5 = A0, Pin 6 = VCC. A2 and WP are not bonded - confirmed in DS22029F-page 14 Pin Function Table and Figure 1-1 SOT-23 diagram.

How many devices can be connected on the same I²C bus using the 34LC02T-E/OT?

Up to four 34LC02T-E/OT devices can share one I²C bus. Because the SOT-23 variant has A2 unconnected, only A1 and A0 are used for chip selection - yielding 2² = 4 unique slave addresses. This is explicitly stated in DS22029F-page 7 ("Only four 34XX02 SOT-23 packages can be connected to the same bus.").

What is the write endurance and data retention specification for the 34LC02T-E/OT?

The 34LC02T-E/OT guarantees 1,000,000 erase/write cycles and 200 years of data retention at 25°C. These values are specified in DS22029F-page 4 (Table 1-2, Note 4) and DS22029F-page 1 (Features list), respectively - validated through characterization, not 100% tested, but ensured per Microchip's Total Endurance™ model.