Part Number: 25P40
Function: 3V, 4Mb, Serial Flash Embedded Memory
Package: SO8 Pin, VFQPN8 Pin Type
Manufacturer: Micron Technology
Image
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