Initially, two types of EPROMs were available; a one-time-programmable version and a version that used ultra-violet (UV) light to erase memory content. The UV erasable version was particularly helpful in permitting design modifications during the prototype and development design phases.

The first practical and easily producible version available was a mere 256 bytes, remarkably small by today’s standards. Many well-known suppliers were selling their own devices, including AMD, Intel, Fujitsu, Hitachi, Macronix, Atmel, and Texas Instruments.

One of the main challenges of EPROMs was the inconvenience of reprogramming using UV light, due to the need for specialized equipment. Thirty years later, the supplier landscape has changed. Original component manufacturers such as AMD, Intel, Fujitsu, Macronix, STM, Toshiba, and Texas Instruments no longer manufacture the devices. However, EPROMs are still required in legacy and mature applications.

Rochester Electronics continues to provide support for these legacy devices. We offer inventory on active and obsolete EPROM devices, and new production, on the classic AM27C256, AM27C512, and AM27C010 devices.

Are you looking for other EPROM devices? Search our inventory.