Part Number: 25P40

Function: 3V, 4Mb, Serial Flash Embedded Memory

Package: SO8 Pin, VFQPN8 Pin Type

Manufacturer: Micron Technology

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Description

The 25P40 is an 4Mb (512Kb x 8) serial Flash memory device with advanced write protection mechanisms accessed by a high-speed SPI-compatible bus. The device supports high-performance commands for clock frequency up to 75MHz. It features an SPI-compatible interface with high-speed operation up to 75 MHz, flexible page programming, and sector-based erase architecture. Advanced write protection mechanisms and low-power modes make it suitable for industrial and automotive applications.

The memory can be programmed 1 to 256 bytes at a time using the PAGE PROGRAM command. It is organized as 8 sectors, each containing 256 pages. Each page is 256 bytes wide.

The entire memory can be erased using the BULK ERASE command, or it can be erased one sector at a time using the SECTOR ERASE command.

Features

• 4 Mbit (512 KB) non-volatile Flash memory
• SPI-compatible interface (up to 75 MHz)
• Single supply voltage: 2.3V to 3.6V
• Page program: 1 to 256 bytes per operation
• Fast programming time: ~0.8 ms (typical)
• Sector erase (512 Kbit): ~0.6 s (typical)
• Bulk erase (entire chip): ~4.5 s (typical)
• Deep power-down mode (~1 µA typical)
• Hardware and software write protection (BP bits)
• High endurance: >100,000 erase/write cycles per sector
• JEDEC ID and optional unique device ID (UID)

Pinouts

Memory Organization

• Total size: 4 Mbit (512 KB)
• 8 sectors (each 512 Kbit / 64 KB)
• Each sector contains 256 pages
• Each page = 256 bytes

Functional Description

• Supports standard SPI commands: READ, FAST READ, PAGE PROGRAM, SECTOR ERASE, BULK ERASE
• Write Enable Latch (WEL) must be set before programming/erase
• Status Register includes Write-In-Progress (WIP) and Block Protect (BP) bits
• Allows continuous sequential read across memory boundaries
• Deep power-down reduces standby current significantly

Design Notes

• Respect page boundaries (256 bytes) during programming to avoid data wraparound
• Use decoupling capacitor (0.1 µF) close to VCC pin
• Ensure SPI timing meets high-speed requirements (signal integrity important above ~25 MHz)
• Implement proper erase-before-write strategy for data integrity
• Consider wear leveling for applications with frequent writes

How to Choose This Part

• Select for moderate-density SPI Flash (4 Mbit class)
• Ideal when high-speed read (up to 75 MHz) is required
• Suitable for code storage with infrequent rewriting
• Consider larger densities (e.g., 8Mb, 16Mb) for expanded storage needs

Typical Applications

• Firmware storage (boot code, configuration)
• Embedded systems and microcontrollers
• Data logging and parameter storage
• Industrial and automotive electronics

Alternative / Equivalent Products

• W25Q40 (Winbond SPI Flash)
• AT25DF041 (Microchip/Atmel equivalent)
• MX25L4005 (Macronix SPI Flash)
• SST25VF040 (Microchip SST series)

25P40 Datasheet PDF Download

Other data sheets are available within the file: M25P40, M25P40-VMN6PBA