National Semiconductor MM5203 EPROM Integrated Circuit  
Written by AnubisTTP on 2021-02-27  

Description

The National Semiconductor MM5203 is a 2048 bit UV erase PROM that was in production for a number of years. The earliest versions of this chip are mounted in a white ceramic carrier with gold leads and a square cavity window. Later versions switched to a gray ceramic package, but retained the square cavity window and gold leads. The most modern and boring versions of this chip are mounted in a standard ceramic package with a round erase window and tinned leads. In normal operation the window is covered with a label or sticker, to prevent ambient UV light from slowly destroying the data stored on the PROM.

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National Semiconductor MM5203 EPROM Integrated Circuit Chip
National Semiconductor MM5203 EPROM IC, lying in state.

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