STMicroelectronics

M27C256B-15F1

M27C256B-15F1 Description

The M27C256B-15F1 is a 256Kbit (32K x 8) parallel EPROM manufactured by STMicroelectronics, designed for reliable non-volatile data storage in embedded systems. Operating within a 4.5V to 5.5V supply range, this through-hole-mounted IC features a 150ns access time, making it suitable for applications requiring moderate-speed memory access. The device is organized as 32K words of 8 bits each, ensuring compatibility with 8-bit microprocessors. Packaged in a 28-pin ceramic DIP (CDIP), it offers robust durability for industrial environments. Although marked as obsolete, it remains relevant for legacy system maintenance and repairs.

M27C256B-15F1 Features

• Memory Capacity: 256Kbit (32K x 8) organization for flexible data storage.
• Fast Access Time: 150ns performance balances speed and power efficiency.
• Wide Voltage Range: Operates at 4.5V–5.5V, compatible with standard 5V systems.
• Durable Packaging: 28-pin CDIP ensures mechanical stability in harsh conditions.
• Industrial Temperature Range: Functions reliably from 0°C to 70°C, suitable for commercial and industrial applications.
• ROHS3 Compliance: Meets environmental standards despite its obsolete status.
• Parallel Interface: Simplifies integration with legacy microcontrollers and processors.

M27C256B-15F1 Applications

• Legacy Embedded Systems: Ideal for retrofitting or repairing older industrial control systems, arcade machines, and automotive ECUs.
• Firmware Storage: Stores fixed code for microcontrollers in medical devices, test equipment, and telecommunications hardware.
• Educational & Prototyping: Used in electronics training to teach EPROM programming and memory interfacing.
• Retro Computing: Popular among hobbyists restoring vintage computers or gaming consoles requiring original EPROMs.

Conclusion of M27C256B-15F1

The M27C256B-15F1 is a dependable EPROM solution for legacy and niche applications, offering a balance of speed, durability, and compatibility. While newer technologies have superseded it, its wide operating voltage, robust packaging, and ease of integration make it a pragmatic choice for maintaining older systems or prototyping. Engineers and enthusiasts value this IC for its proven reliability in scenarios where modern flash memory may not be a drop-in replacement.