512kx8 UV EPROM, 120ns, PDIP-32, Erasable Programmable ROM.
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The M27C4001-12F1 is a 4 Mbit (512Kb x 8) UV Erasable Programmable Read-Only Memory (EPROM) manufactured by STMicroelectronics. This component provides non-volatile storage with a 120 ns access time. It is supplied in a 32-pin Plastic Dual In-Line Package (PDIP-32).
The M27C4001-12F1 EPROM is suitable for applications requiring reprogrammable non-volatile memory. Its UV erasability allows for firmware updates and prototyping. The device is often used in embedded systems and legacy hardware.