We are currently using the NDK crystal NX3225GD 8 MHz (EXS00A-CG04874) for the HSE clock of STM32F412VG and STM32F469BI.
This crystal is also used on evaluation boards, and we understand that it is an approved custom-order part.
However, we are currently facing procurement issues due to long lead times, and this part is not readily available.
As an alternative, we are considering using the standard NDK part NX3225GD 8 MHz (STD-CRA-3), although its specifications differ as shown below:
NX3225GD 8 MHz (EXS00A-CG04874)
- Frequency: 8 MHz
- Frequency tolerance: ±20 ppm
- Frequency stability (over temperature): ±50 ppm (-40 to +85°C)
NX3225GD 8 MHz (STD-CRA-3)
- Frequency: 8 MHz
- Frequency tolerance: ±50 ppm
- Frequency stability (over temperature): ±150 ppm (-40 to +150°C)
We understand that the alternative part has lower accuracy and wider temperature variation.
Would it be acceptable to use the NX3225GD 8 MHz (STD-CRA-3) as a replacement for the HSE in these devices?
If there are any concerns (e.g., clock accuracy, USB/communication interfaces, or PLL performance), we would appreciate your advice.
Could you also kindly advise which document describes the specifications or requirements for the HSE crystal oscillator?
Hiroshi Yamada
