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What is W25B40?

This electronic component, produced by the manufacturer "Winbond", performs the same function as "4M-BIT SERIAL FLASH MEMORY".


W25B40 Datasheet PDF - Winbond

Part Number W25B40
Description 4M-BIT SERIAL FLASH MEMORY
Manufacturers Winbond 
Logo Winbond Logo 


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W25B40/W25B40A
4M-BIT SERIAL FLASH MEMORY
WITH BOOT AND PARAMETER SECTORS
Formally NexFlash NX25B40
The Winbond W25B40 / W25B40A is fully compatible with the previous NexFlash NX25B40 Serial
Flash memory.
Publication Release Date: January 6, 2006
- 1 - Revision M

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W25B40 equivalent
3. PIN CONFIGURATION
W25B40/W25B40A
Figure 1. W25B40 / W25B40A Pin Assignments, 8-pin SOIC (Package Code SN)
4. PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
PIN NAME
/CS
DO
/WP
GND
DI
CLK
/HOLD
VCC
I/O FUNCTION
I Chip Select Input
O Data Output
I Write Protect Input
Ground
I Data Input
I Serial Clock Input
I Hold Input
Power Supply
4.1 Package Types
The standard package for the W25B40 / W25B40A is an 8-pin plastic SOIC with 150-mil body
(Winbond package code SN) (NexFlash package code N). The pinout for the package is shown in
Figure 1. Package diagram and dimensions are illustrated at the end of this data sheet.
4.2 Chip Select (/CS)
The SPI Chip Select (/CS) pin enables and disables device operation. When /CS is high the device is
deselected and the Serial Data Output (DO) pin is at high impedance. When deselected, the devices
power consumption will be at standby levels unless an internal erase, program or status register cycle
is in progress. When /CS is brought low the device will be selected, power consumption will increase
to active levels and instructions can be written to and data read from the device. After power-up, /CS
must transition from high to low before a new instruction will be accepted. The /CS input must track
the VCC supply level at power-up (see “Write Protection” and figure 18). If needed a pull-up resister
on /CS can be used to accomplish this.
Publication Release Date: January 6, 2006
- 5 - Revision M


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for W25B40 electronic component.


Information Total 36 Pages
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Featured Datasheets

Part NumberDescriptionMFRS
W25B40The function is 4M-BIT SERIAL FLASH MEMORY. WinbondWinbond
W25B40AThe function is 4M-BIT SERIAL FLASH MEMORY. WinbondWinbond

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