Microchip Technology AT34C02N-10SC-1.8

Overview

AT34C02N-10SC-1.8 from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) serial EEPROM with permanent software write protection for the first-half of memory (00H–7FH), hardware write protection via WP pin, and 1.8 V to 5.5 V operation. It supports 100 kHz I²C communication at 1.8 V, features 16-byte page writes, self-timed 10 ms max write cycles, and is housed in an 8-lead JEDEC SOIC package. It is used in embedded systems requiring nonvolatile parameter storage with dual-layer data integrity.

For engineers reviewing the AT34C02N-10SC-1.8 datasheet, AT34C02N-10SC-1.8 pinout, AT34C02N-10SC-1.8 application, or AT34C02N-10SC-1.8 equivalent, key selection considerations include its 1.8 V minimum supply, irreversible software write protect capability, WP-controlled full-array hardware lock, Schmitt-triggered noise-immune inputs, and compatibility with standard 2-wire (I²C) bus timing at low voltage.

Technical Context

The AT34C02N-10SC-1.8 implements a true 2-wire (I²C-compatible) interface with open-drain SDA and edge-triggered SCL, supporting both byte and 16-byte page writes. Its internal address counter enables current-address, random-address, and sequential read modes without external addressing logic.

Write protection operates at two independent levels: software-based (permanent, first-half only, programmed via 0110 control code with WP low) and hardware-based (full-array, enabled by pulling WP high). The device remains fully readable under all protection states and uses acknowledge polling to detect write completion.

Key Specifications

Pinout & Package

AT34C02N-10SC-1.8 is packaged in an 8-lead JEDEC SOIC (package code 8S1), 0.150" wide, surface-mount format with standard gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT34C02N-10SC-1.8, M95M02-RMN6TP offers higher density and faster writes but mandates SPI redesign, while 24AA02E48-I/MS adds MAC uniqueness at the cost of irreversible software write protection - making AT34C02N-10SC-1.8 optimal for applications demanding both low-voltage reliability and tamper-resistant parameter partitioning.

Availability

AT34C02N-10SC-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, medical device audit logging, and automotive body control module settings requiring stable component supply, long-term data retention, and dual-mode write protection.

Supply support for AT34C02N-10SC-1.8 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 is a global semiconductor company delivering microcontrollers, analog components, FPGAs, and memory solutions with emphasis on reliability, longevity, and embedded control.

The AT34C02 series was designed as a drop-in serial EEPROM replacement for legacy 24C02-family devices, optimized for low-voltage operation, enhanced noise immunity, and flexible write protection - targeting industrial, medical, and automotive subsystems where data integrity is mission-critical.

FAQ

What is the minimum operating voltage for AT34C02N-10SC-1.8?

The AT34C02N-10SC-1.8 operates down to 1.8 V, with full functionality including 100 kHz I²C communication, page writes, and write protection logic. This allows direct connection to 1.8 V I/O domains without level shifters, reducing BOM count and layout complexity in ultra-low-power designs.

Can the software write protection on AT34C02N-10SC-1.8 be disabled after programming?

No - the software write protection on AT34C02N-10SC-1.8 is permanent and irreversible once enabled. It locks the first 1 Kbit (addresses 00H–7FH) against all future writes, even after power cycling. This feature is intended for storing immutable calibration data or security keys that must survive firmware updates or field service.

How does the WP pin affect write operations on AT34C02N-10SC-1.8?

When the WP pin of AT34C02N-10SC-1.8 is pulled high to VCC, hardware write protection activates and blocks all write operations to the full 2 Kbit array - regardless of software protection status. When WP is grounded or floating, software protection behavior applies: unprotected, first-half-only, or full-array lock depending on register state.

What is the maximum write speed supported by AT34C02N-10SC-1.8 at 1.8 V?

At 1.8 V supply, AT34C02N-10SC-1.8 supports a maximum I²C clock frequency of 100 kHz. This timing constraint ensures signal integrity and noise margin under low-voltage conditions. The internal write cycle remains fixed at ≤10 ms regardless of clock speed, meaning throughput is limited by tWR, not bus rate.

Does AT34C02N-10SC-1.8 support partial page writes?

Yes - AT34C02N-10SC-1.8 supports partial page writes within its 16-byte pages. A page write sequence can transmit 1 to 16 bytes; the internal address counter increments automatically, wrapping within the same page boundary. This enables efficient updates of non-aligned data structures without reading-modify-write overhead.