What is eeprom

Last updated: April 1, 2026

Quick Answer: EEPROM (Electrically Erasable Programmable Read-Only Memory) is a type of non-volatile memory that can be electrically erased and reprogrammed multiple times, commonly used in computers, embedded systems, and electronic devices to store configuration data and firmware.

Key Facts

Overview

EEPROM stands for Electrically Erasable Programmable Read-Only Memory. It is a type of non-volatile computer memory that can be electrically erased and reprogrammed to store new data. Unlike traditional ROM (Read-Only Memory), which requires physical replacement or special equipment to modify, EEPROM allows users to update stored information through electrical signals alone.

How EEPROM Works

EEPROM operates by storing electrical charges in floating-gate transistors. When you apply an electrical voltage, these transistors either store or release charge, representing binary data (1s and 0s). The primary advantage is that the data persists even when power is removed, making it ideal for storing critical information that must survive power failures.

Characteristics and Specifications

Key characteristics of EEPROM include:

Common Applications

EEPROM is widely used in microcontroller-based systems, including automotive electronics, industrial controllers, consumer appliances, and computer peripherals. It stores device calibration data, configuration settings, firmware versions, and unique identifiers like serial numbers. Modern smartphones, smart home devices, and IoT sensors frequently use EEPROM variants to maintain user preferences and system state information.

EEPROM vs. Other Memory Types

Compared to RAM, EEPROM is slower but retains data without power. Compared to flash memory (used in USB drives), EEPROM offers smaller storage capacity but better endurance in some applications. Flash memory has largely superseded EEPROM for high-capacity storage, but EEPROM remains essential for embedded systems requiring small amounts of persistent data with moderate write cycles.

Related Questions

What is the difference between EEPROM and Flash memory?

EEPROM allows byte-level erasing and rewriting, while Flash memory erases in blocks. Flash memory offers larger storage capacity and faster performance, but EEPROM often provides better endurance for frequent small data updates in embedded systems.

How long does data last in EEPROM?

EEPROM can retain data for 10-20 years or longer when stored properly. The actual lifespan depends on manufacturing quality, storage conditions, and environmental factors like temperature and humidity.

Can EEPROM be overwritten unlimited times?

No, EEPROM has a limited number of erase/write cycles, typically between 100,000 and 1,000,000 per cell. Exceeding this limit causes data corruption and memory cell failure.

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Sources

  1. Wikipedia - EEPROM CC-BY-SA-4.0
  2. Electronics Tutorials - EEPROM Memory CC-BY-SA-4.0