W25Q64JVXGIM Shortage

T

TomV

Active member
Looking at producing another batch of custom Teensy 4.1 boards, but I’m struggling to find any stock of the W25Q64JVXGIM. I’m assuming this is fallout from the current memory shortages driven by AI demand, but happy to be corrected.

Is there an alternative that works with the T4.1? Ideally in the same package so I can avoid respinning the board. Looking to source from Mainland china/Asia to avoid international shipping if possible.
 
But then the board effectively turns into a micromod, which can mess up the pin numbers and other software behaviour...
 
PJRC still has some W25Q64JVXGIM chips in stock. But we're down to just a couple hundred left, so only enough for a fairly small batch.

I am working on an update to the bootloader to bring compatibility with many more chips. While everything is still preliminary, I can tell you I have GD25Q16EEIGR and GD25Q64EQIGR on my workbench now for testing. Odds are very good those 2 will be on the compatible list after the update. In addition to GigaDevice, I'm also testing chips from ISSI, Macronix, BYTe Semi, Microchip, Renesas, and the Winbond "Q" version parts.

Time frame for the bootloader update is also still preliminary, but I'm aiming for mid-April. I know the memory shortage is painful. I'm working to bring you many more options, but it needs to be done carefully with a lot of testing.
 
jmarsh said:
But then the board effectively turns into a micromod, which can mess up the pin numbers and other software behaviour...
Click to expand...
Build and src edits can present an 8MB T_MM Flash as a T_4.1 with 8MB Flash, but that would be an ongoing issue to work with on those units.
 
PaulStoffregen said:
PJRC still has some W25Q64JVXGIM chips in stock. But we're down to just a couple hundred left, so only enough for a fairly small batch.

I am working on an update to the bootloader to bring compatibility with many more chips. While everything is still preliminary, I can tell you I have GD25Q16EEIGR and GD25Q64EQIGR on my workbench now for testing. Odds are very good those 2 will be on the compatible list after the update. In addition to GigaDevice, I'm also testing chips from ISSI, Macronix, BYTe Semi, Microchip, Renesas, and the Winbond "Q" version parts.

Time frame for the bootloader update is also still preliminary, but I'm aiming for mid-April. I know the memory shortage is painful. I'm working to bring you many more options, but it needs to be done carefully with a lot of testing.
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Hi Paul,

Thanks for the reply. The memory shortage is certainly painful! it will be great if more chips are supported. To support the new memory IC's I assume a new bootloader IC will also be required rather than an update to the boot loader firmware?

Just working out whether to hold off until April and go with new boot loaders and a more available memory IC or to produce a batch now with parts from your stock. I still have a few bootloader ICs at JLC, but it will work out expensive to freight just a few of the W25Q64JVXGIM there.

Will all the new ICs also be compatible with FlexSPI2 and Little_FS?

Thanks.
 
TomV said:
To support the new memory IC's I assume a new bootloader IC will also be required rather than an update to the boot loader firmware?
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Correct. All bootloader chips sold before the update will only work with the Winbond "M" chips.


TomV said:
Will all the new ICs also be compatible with FlexSPI2 and Little_FS?
Click to expand...

All the newly supported chips will be confirmed working with LittleFS_Program and EEPROM library and emulated AVR eeprom functions. Those all access the program flash memory.

Updating LittleFS_SPIFlash and LittleFS_QSPIFlash to recognize all these chips connected to any of the SPI ports or the QSPI pads on the bottom of Teensy 4.1 will be separate project. LittleFS already does work with many of these chips.
 
Today W25Q64JVXGIQ can not work with the current bootloader chips.

In the near future, W25Q64JVXGIQ will be able to work, but only with new updated bootloader chips.
 
PaulStoffregen said:
PJRC still has some W25Q64JVXGIM chips in stock. But we're down to just a couple hundred left, so only enough for a fairly small batch.

I am working on an update to the bootloader to bring compatibility with many more chips. While everything is still preliminary, I can tell you I have GD25Q16EEIGR and GD25Q64EQIGR on my workbench now for testing. Odds are very good those 2 will be on the compatible list after the update. In addition to GigaDevice, I'm also testing chips from ISSI, Macronix, BYTe Semi, Microchip, Renesas, and the Winbond "Q" version parts.

Time frame for the bootloader update is also still preliminary, but I'm aiming for mid-April. I know the memory shortage is painful. I'm working to bring you many more options, but it needs to be done carefully with a lot of testing.
Click to expand...
Hi Paul, Just wondering if you had any further updates on the supported memory ICs? Thanks.
 
Yes, I released bootloader version 1.09 just a few days ago. The T4 bootloader chip page was updated at that time, but looks like I forgot about this forum thread. Good thing you asked!

Version 1.09 supports many more flash chips. A complete list is on the web page.

PJRC was able to buy a good quantity GigaDevice GD25Q64EQIGR, which is among the many newly supported parts. It's available on the website now.

Many of the newly supported memory chips are in stock at Digikey, Mouser, LCSC and probably other vendors. We are in a time of global shortages, but it's nothing like the covid shortages a few years ago. Stock at the distributors is fluctuating daily. Hopefully version 1.09 bringing compatibility with so many chips will help.

We also saved a small quantity of the old Winbond part for people who previously purchased the T4 bootloader chips. We emailed all customers who had purchased bootloader chips without flash chips within the last few weeks. They bought most of the stock we set aside. We do still have just a few dozen. We're only selling them to people who purchased T4 bootloader chips before the update.
 
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PaulStoffregen said:
Version 1.09 supports many more flash chips. A complete list is on the web page.
Click to expand...
That is a bunch of chips and across the three sizes 2,4,16 MB!

Also noted there is this - TD 1.61 won't be far off - to support Lockable on the new bootloader - that's a broad swath of work!

Update, April 22, 2026: Finally we've completed testing for version 1.09 with all supported flash memory chips. If used as lockable in secure mode, a new version of Teensyduino is required to create compatible .ehex files. An updated beta version will be coming soon, with full Teensyduino 1.61 release expected by the end of May. Use without secure mode work with Teensyduino 1.60 and prior versions.
 
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