Microchip Technology 34LC02-I/P

Overview

34LC02-I/P 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 industrial temperature (–40°C to +85°C) in 8-lead PDIP package. It serves as nonvolatile configuration storage in embedded control systems requiring robust data integrity.

For engineers reviewing the 34LC02-I/P datasheet, 34LC02-I/P pinout, 34LC02-I/P application, or 34LC02-I/P equivalent, this page delivers verified electrical specs, validated pin functions, confirmed write-protection behavior, real-world use cases, and two technically documented alternative parts - all specific to the 34LC02-I/P variant and its PDIP packaging.

Technical Context

The 34LC02-I/P implements a 256 × 8-bit memory array accessed via a bidirectional 2-wire I²C bus, with master-controlled SCL/SDA timing and slave-only operation. Its internal address pointer supports current-address, random, and sequential read modes, while write operations include byte and page (≤16 bytes) modes with self-timed erase/write cycles.

Write protection is enforced through three independent mechanisms: hardware (WP pin tied to VCC), resettable software (SWP/CSWP commands), and permanent software (PSWP command), all targeting the lower 128-byte block (00h–7Fh). Schmitt-trigger inputs and input filtering suppress noise on SDA/SCL lines, and VCC brown-out detection disables writes below 1.35V.

Key Specifications

Pinout & Package

34LC02-I/P is supplied in an 8-lead plastic dual in-line package (PDIP), 0.300-inch body width, with through-hole mounting and industry-standard pin spacing. Pin 1 is marked by notch or dot; pin numbering follows standard counter-clockwise convention from top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02BT-I/P and AT24C02D-PU, the 34LC02-I/P uniquely combines 1 MHz speed, industrial-temp PDIP packaging, and triple-layer write protection (hardware + resettable + permanent), making it optimal for high-reliability embedded systems demanding both performance and data integrity assurance.

Availability

34LC02-I/P is available at Aetrix Electronics and suitable for industrial sensor nodes, smart energy meters, automotive body control modules, and medical infusion pumps requiring stable component supply across extended production lifecycles.

Supply support for 34LC02-I/P 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 emphasis on reliability, longevity, and embedded-system integration.

The 34LC02-I/P belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-power, and secure nonvolatile data storage in industrial, automotive, and medical applications where write-protection integrity and long-term data retention are mandatory.

FAQ

What is the maximum I²C clock frequency supported by the 34LC02-I/P?

The 34LC02-I/P supports up to 1 MHz I²C clock frequency when VCC is 2.5V or higher. At lower voltages (2.2V ≤ VCC < 2.5V), the maximum clock rate remains 1 MHz per the datasheet; this distinguishes it from the 34AA02 variant, which is limited to 400 kHz above 1.8V. The 34LC02-I/P's 1 MHz capability reduces EEPROM access latency in time-sensitive boot or configuration routines.

How does hardware write-protection work on the 34LC02-I/P?

Hardware write-protection on the 34LC02-I/P is controlled by the WP pin: when tied to VCC, the entire 256-byte memory array is locked against write operations; when tied to VSS, hardware protection is disabled. This pin-level control operates independently of software write-protection states and remains active even during power transitions - ensuring immunity to firmware glitches or unintended I²C traffic.

Can the 34LC02-I/P be used in a 1.8V system?

No, the 34LC02-I/P has a minimum supply voltage of 2.2V and is not rated for 1.8V operation. For 1.8V systems, the 34AA02 variant (1.7V–5.5V range, 400 kHz max) is the appropriate selection. Attempting to operate the 34LC02-I/P below 2.2V may result in unreliable write cycles, failed acknowledge polling, or undefined behavior per the device's absolute maximum ratings.

What is the purpose of the VHV detection on the A0 pin of the 34LC02-I/P?

The A0 pin on the 34LC02-I/P serves dual function: chip-select address input and high-voltage detection (VHV) for software write-protection commands. To issue SWP or CSWP instructions, a 7–10V pulse must be applied to A0 while presenting the correct command byte (0110xxxx) and proper A1/A2 levels - this prevents accidental activation of permanent or resettable protection during normal I²C communication.

Does the 34LC02-I/P support cascading with other I²C EEPROMs on the same bus?

Yes, the 34LC02-I/P supports cascading up to eight devices on a single I²C bus using its A0, A1, and A2 address pins. Each device is assigned a unique 3-bit hardware address (000–111), enabling individual addressing without software arbitration. For SOT-23 variants, A2 is unconnected, limiting cascading to four devices - but the 34LC02-I/P in PDIP retains full 3-bit address capability.