STM32F4 and alternatives

[Legacy member]

Hello everyone ;

Please if someone from ST could confirm :

We have a shortage of stm32f429 and the given lead time is about 80 weeks ; so our production will be stopped for 1 year; to solve this we decided to revise the design of the board and choose an alternative MCU without shortage with lead time maximum 40 weeks . Firstly we prefer to find alternatives from ST , because the migration of the software would be eaiser for us . We have called the local ST in Turkey ; they informed us only G series would have a lead time of 40 weeks ; but G series dont fill our need because we need to drive TFT screen , My qıuestion : anyone from sT confirm this please , is there any other series with maximum 40 weeks leadtime rather than G series? Becauee that really important to us for the next step.

Thank you in advanced

[Uwe Bonnes]

At the moment, findchips shows Avnet with F429 availability.

[S.Ma]

Maybe consider dual footprint?

[Legacy member]

NO. abnet dont have and the lead time is not fix and i need 12k.

[Legacy member]

what do you mean ?

[Tesla DeLorean]

Presumably something that will take LQFP 64, 100, 144, 176 parts, russian nesting doll fashion depending on what you can actually source.

TBH we've used 144-pin designs that map well across multiple generations of STM32 parts, with some accommodations for a handful of pins at the BOM level.

Or a board with a simple carrier assembly to provide more flexibility.

It's not clear that all 52-weeks of pending deliveries have a final destination, and some might be speculative/arbitrage purchases. Like oil-futures, but without the storage issues..

[Legacy member]

we stucked :)) . I think we should move to other MCU ; still no any reply from ST . I dont know .. should I write to microchip asking about sT :) ?

[Pavel A.]

Of course you can write to Microchip and ask about their ARM Cortex MCUs. Maxim and many others make Cortex MCUs as well. You are welcome to research.

[Tesla DeLorean]

Not sure what you're looking for them to tell you? Pretty much any fab doing this has an order queue pushing out 40 or 50 weeks or more​.

I'​d look for the part with the smallest die on the largest wafer. So probably not ones with MBs of FLASH/SRAM.

Once you commit to another MCU get it in the stockroom as you start, not after you finish the design/development phase.​

[Georgy Moshkin]

TFT screen may be driven in software using GPIO+DMA, have you considered that? To widen your choice, I recommend to research this option. Emulation may be nicely wrapped in code to maintain backward compatibility for previous MCU series. As an example, thanks to chip shortage I had a project where F4 series was replaced by F1 that was available in a clients warehouse. Just replaced all FPU stuff with fixed point based on 16 and 32 bit integers.