I'd like to identify the manufacturer of these crystal units. Apparently the first line contains the frequency information (8 MHz, 16 MHz...).

The second line starts with a small 'e' which is probably a manufacturer signature.

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2 Answers 2


Epson devices have an "e" on them, but almost all I've seen use a capital "E".

And ECS devices normally have the full "ECS".

The only match I can see is Abracon, who use e2 to denote temperature stability. See this datasheet for one of their units, where e2 means +/-20ppm over the range -20°C ~ +70°C. However that is far from a definite match.

  • 2
    \$\begingroup\$ I was about to comment the same thing, see here: ie.rs-online.com/web/p/crystal-units/1732283 \$\endgroup\$
    – John D
    Sep 13 at 20:33
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    \$\begingroup\$ The one on the bottom could possibly belong to the Seiko Epson FA-238A series. lcsc has pictures that look very close in terms of marking style. \$\endgroup\$
    – nanash1
    Sep 14 at 6:46

@nanash1 found it !

The small "e" mark is used on Automotive qualified crystals of Seiko Epson.

If you go to the following link: https://www5.epsondevice.com/en/products/car_electronics/

in Crystal 32kHz and Crystal MHz sections, you can get several condensed datasheets and some overviews of some series.

One example: https://www5.epsondevice.com/en/products/crystal_unit/fa2016aa.html

Thank's a lot for your help!


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