Hi, I reply to miself, after discussion with crystal manufacturer, 30ohm MAX ESR is achiveable but it depends on casing. It is not available in modern casing like 2016(mm), but available in 3225(mm) or bigger. Still disapointing do be stuck with a crystal so big, nearly as big as the chip itself. Re...

Hi, I am designing board based on ESP8684H2, 26Mhz crystal selection is difficult because there is no information in datasheet. After contacting support, they give spec as 10ppm/10ppm/10pF/30ohm max... The problem : there is no manufacturer offer with such low ESR , for example, Abracon or ECS is 50...