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World-Class Serial EEPROMs

Microchip has been manufacturing serial EEPROMs for over 30 years. With the industry’s largest portfolio, we provide a full range of densities and communication protocols to meet your needs. Our quality and reliability set us apart and is one reason we ship over one billion serial EEPROMs each year.

Why Design with Microchip’s Serial EEPROMs?

  • Innovative Bus Types: Single-wire and UNI/O® bus for pin-constrained applications and accessory authentication
  • Industry-Standard Bus Types: I2C, SPI and Microwire
  • Complete Product Line: Full range of densities from 128 bits to 2 Mbit to scale with your design
  • Long product life cycles: Our practice of customer-driven obsolescence removes the risk of forced redesigns
  • Extended Temperature and Voltage Ranges: Operation from -40°C to 150°C and 1.5V to 5.5V for industrial and automotive applications
  • Reliability: Endurance of one million erase/write cycles and over 200 years of data retention
  • Quality: QS9000 compliant, ISO/TS16949 compliant, AEC-Q100 compliant, RoHS compliant, Pb-free
Step 1: What is EEPROM

This short three-minute video will give you a high-level overview of EEPROM including what it is, why it sells, when to choose it and when not to choose it.

Step 2: Microchip's Serial EEPROM Overview

Microchip’s Serial EEPROM products are compatible with five serial bus types and support densities that range from 128 bits up to 2 Mbits. These bus types include the standard two-wire I2C, three-wire Microwire, four-wire SPI, along with proprietary single-wire and UNI/O buses. Almost all applications can be supported with operating voltages ranging from 1.5V up to 5.5V and operating temperature ranging from -40°C to 150°C.

Microchip continues to offer new Serial EEPROM innovations.  Our single-wire devices require just one I/O pin to interface with a microcontroller or another single-wire chip. These are ideal for adding verification, usage record and counterfeit protection to your devices. Additionally, we offer a family of MAC address chips, each of which is pre-programmed with unique EUI-48™ and EUI-64™ node addresses. We also manufacture Unique ID EEPROMs that are pre-programmed with a 32-, 48-, 64- or 128-bit serial number to provide device identification and tracking.

Step 3: How to Select Your Serial EEPROM

When choosing a Serial EEPROM, there is a balancing act between cost and density, but the system software will usually drive this requirement. Usually the amount of memory required to complete a project is estimated before the design is completed. The final density purchased is usually 50% larger to allow for future growth.

To better illustrate the process of selecting a specific EEPROM device, here is an example of the types of questions that come up in the design phase:

  • Does the microcontroller have a programmable serial port that can support I2C, SPI, Microwire or UNI/O® serial buses?
  • How many spare I/O ports on the microcontroller are available for use by the EEPROM?
    • Is your microcontroller pin limited?
    • Is it cheaper to switch to a bigger microcontroller or reduce the I/O ports required to interface with the serial EEPROM?
    • Do you need to use less I/O pins with memory on the microcontroller to free up the extra I/O pins for other applications?
  • Are there any other peripherals in the system design that use a serial interface such as I2C, SPI or Microwire?
    • If no serial ports are available, will the serial interface be emulated by bit banging several I/O ports?
  • How much memory will be required to complete the project and will it be necessary to upgrade to a larger memory size in the future?
    • If more memory is needed, will a larger package impact the design?
    • If more memory is needed will cascading serial EEPROMs be a viable option
  • Is the bus speed known so that a bus type can be selected?
  • If there is a limitation of I/O ports, will the slower speeds of the I2C or UNI/O bus meet the system requirements since they use the fewest I/O ports, two and one respectively?
  • Are there any space constraints in the application that dictate a smaller package or die/wafer?
  • Is there a minimum or maximum voltage or operating temperature requirement?

In many cases, the application notes and technical briefs you read will point you directly to the part you should use. Finally, contact your local Microchip Sales Office and discuss your findings with one of our knowledgeable sales staff or Field Applications Engineers (FAEs). They would be happy to help you with your Serial EEPROM selection.



Pre-Programmed MAC Address and Unique ID EEPROMs

Need a MAC address but don’t want to buy in bulk? Or do you maybe need a generic unique ID? Microchip makes serialization easy with pre-programmed EEPROMs including IEEE EUI-48™ and EUI-64™ addresses and unique 32-bit and 128-bit Microchip-defined serial numbers.


Do you have a space-constrained application? Or are you looking to integrate EEPROM memory into your module? These tiny 4-ball Wafer Level Chip Scale Package (WLCSP) EEPROMs will fit on the tip of your pen. They are ideal for applications where tiny matters, including smartphones, high-frequency cable ends, cameras, handheld and medical devices. Advanced features like software write protection and configurable hardware addressing allow full I2C functionality while only requiring four physical connections.

Single-Wire and UNI/O Bus EEPROMs

Want to learn more about Microchip’s innovative communication buses that use just one pin to interface with a microcontroller (MCU)? Discover how to reduce the number of pins needed for your design with our single-wire and UNI/O Bus EEPROMs.


Microchip offers JEDEC-compliant Serial Presence Detect (SPD) EEPROMs for use in DRAM Dual Inline Memory Modules (DIMM). These include software write protection features for the lower 128 bytes of the EEPROM that can be made permanent.


I2C Serial EEPROM Products by Density




SPI Serial EEPROM Products by Density




Microwire Serial EEPROM Products by Density




UNI/O Bus Serial EEPROM Products by Density




Single-Wire Serial EEPROM Products by Density