Difference Between EEPROM and EPROM

Difference Between EEPROM and EPROM

Programmable read-only memory EEPROM and EPROM are both examples of this sort of memory (ROM). It is used in computers to store the software in nonvolatile memory. External programming devices are both involved. To delete and rewrite their memories, it is possible. In the same way that EPROM is an expanded version of PROM, EEPROM is.


To put it another way, the content of an EEPROM is deleted using electrical impulses, while that of an EPROM is erased using ultraviolet light. EPROM has been replaced with EEPROM, which is a more recent development. It is also possible to do multi-byte page operations in contemporary EEPROMs. EPROM, on the other hand, is more difficult to erase.

Non-volatile memory, such as an EEPROM, is what it is. Data may be stored, read, and rewritten using this enhanced EPROM. So it’s better than EPROM since it has more functions. Multi-byte page operations are often carried out in EEPROM. Milliseconds after a signal is sent to wipe it, the data is gone forever.

Unlike PROM, EPROM has more information. In addition, it is a kind of permanent memory. Rewriting data is also possible. Even though the process of erasing the data only takes a few minutes. Exposure to UV light erases the data. This may be accomplished by using a Mercury Vapor lamp, which emits UV light.

What is an EEPROM?

Electronically Erasable Programmable Read-Only Memory (EEPROM) or E2PROM is a kind of memory that can be erased and reused. Computers make use of it as a kind of nonvolatile memory. The information saved in this format is readily accessible. It is also used to store data in electrical devices with embedded microcontrollers.

Smart cards, remote keyless entry systems, SIM cards, and credit cards are just a few of the items that make use of it. It has the advantage of storing just a tiny quantity of information. Individual bytes may be wiped and reprogrammed using this technique. Only a few seconds are needed to wipe all of the data. To remove data from an EEPROM, electric signals are needed.

To delete a byte from an EEPROM, you’ll need a two-transistor structure. It uses just 5 volts of power because of the transistor used in it. Tunnel programming is used for EEPROM programming.

It is also possible to find a small amount of EEPROM in devices such as digital clocks and potentiometers. This technique, however, is not without its drawbacks. Data retention and durability are the only two restrictions. The limit for endurance is 1 million. Furthermore, data retention is capped at ten years.

One of the numerous benefits of EEPROM is that it may be erased without having to be removed from the computer.

What is an EPROM?

Erasable Programmable Read-Only Memory is the EPROM acronym. It’s an enhanced version of the PROM, an externally programmable integrated chip. To put it another way, it’s an optically readable kind of memory (ROM). The EPROM is a memory chip that may be used to access the data it has stored. This chip will save its data even if the power source fails. All your information is safeguarded.

EPROM features a window at the top through which the silicon chip may be seen. To wipe the EPROM’s memory, it must be removed from the computer. To wipe its memory, it must be removed from the computer’s circuitry and exposed to a UV light source similar to a mercury vapour lamp. It might take varied amounts of time for UV rays to reach the skin. It might take weeks for the sun’s rays to erase the memories they leave behind.

It is therefore possible to do a computer reprogramming. It is also important to note that EPROM programming is non-reversible. In fact, a programmed EPROM chip may keep its data for at least ten to twenty years without losing any information.

The EPROM is programmed via hot electron injection programming. The MOS transistor in EPROM can handle 12.5 volts. The transistors in the memory need a greater voltage in order to store data.

Difference Between EEPROM and EPROM

  • An electric signal is used to delete the contents of EEPROM, while UV rays are used to erase the contents of EPROM.
  • In EEPROM, the number of cells per square inch is three, but in EPROM, the number is one.
  • The content of an EPROM may be erased in minutes, while EEPROM takes milliseconds.
  • Because it is an enhanced form of EPROM, EEPROM offers superior functionality.
  • In EEPROM, the transistor requires just 5 volts, but in EPROM it consumes 12.5 volts.
  • EPROM must be removed from the computer in order to clear its memory, but EEPROM does not.


The use of nonvolatile memory in computers and other electrical devices is common. Examples include EEPROMs and EPROMs. The most up-to-date format is the EEPROM. EEPROM erases data in milliseconds by sending electric impulses across the device, which is very rapid. Both quickly and densely packed, it’s a blast. Most of the time, it’s used when there are just a few files to store and organise.

The transistor in an EPROM needs higher voltage and erases data far more slowly than the transistor in an EEPROM. The data is erased by the use of ultraviolet (UV) light-based technologies. EPROM has a silicon chip that can be readily seen. You will need to remove the chip from the computer in order to delete the data stored on it.

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