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chonkzman
Associate
May 11, 2026
Solved

stm32h743xi6 emmc and spi flash chips selection for pcb

  • May 11, 2026
  • 1 reply
  • 135 views

Hi all,

I'm looking for recommendations on eMMC chips that are known to work reliably with the STM32H743 via SDMMC1 in 8-bit mode.

I've gone through a number of threads here and put together what I've found so far:

- Micron 4GB (MTFC4GACAJCN) — comes up often, though some posts mention HAL misreading certain CSD fields (appears cosmetic rather than functional)
- Kingston 4GB — confirmed working with SDMMC1 + FatFS + FreeRTOS, corruption reports seem tied to FatFS rather than the chip itself
- Samsung KLM series — functional but VCCQ voltage negotiation adds complexity
- Kioxia THGBMDG5D1LBAIL — 153-ball WFBGA, eMMC 5.0, fewer reports but looks promising

Happy to keep things simple — 3.3V on both VCC and VCCQ, no need for HS200/HS400.

Would love to hear from anyone who has had long-term success with a particular chip, or any that are worth avoiding. Any layout tips for the 153-ball WFBGA package are also welcome.

Best answer by mƎALLEm

STM32h743, STM32H745 and STM32H750 share the same die.

You can use MTFC4GACAJCN  as suggested.

For the availability I don't know you need to contact the eMMC manufacturer.

1 reply

mƎALLEm
mƎALLEm
Technical Moderator
May 11, 2026

Hello @chonkzman and welcome to the ST community,

@chonkzman wrote:

- Micron 4GB (MTFC4GACAJCN) — comes up often, though some posts mention HAL misreading certain CSD fields (appears cosmetic rather than functional)

MTFC4GACAJCN is available already on STM32H7 disco board such as STM32H745-DISCO and STM32H750-DISCO. Need to use the BSP drivers provided in the CubeHAL of the boards:

eMMC driver for STM32H745-DISCO:

https://github.com/STMicroelectronics/stm32h745i-disco-bsp/blob/a853043cbeb37280747f5554dc791e4ee58c91b0/stm32h745i_discovery_mmc.c

eMMC driver for STM32H750-DISCO:

https://github.com/STMicroelectronics/stm32h750b-dk-bsp/blob/e15ab34e23e2929f768f3f00efe9aac75f057b50/stm32h750b_discovery_mmc.c

And this is the schematic:

mALLEm_1-1778492245765.png

Hope that helps.

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chonkzmanAuthor
Associate
May 12, 2026

thank you , pls note I'm using stm32h743xi and plan to use this emmc for multiple boards , is there not a full proof emmc that is still being manufactured and in stock (digikey,mouser)? 

mƎALLEm
mƎALLEmAnswer
Technical Moderator
May 12, 2026

STM32h743, STM32H745 and STM32H750 share the same die.

You can use MTFC4GACAJCN  as suggested.

For the availability I don't know you need to contact the eMMC manufacturer.

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.
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