there is no technical difference, the suffixes are an internal identifier and only designate the place of manufacture that is not relevant for the function.
Good luck!
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/Peter
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No, DIACs are bidirectional, as you can also see from the datasheet, fig. 1.
The TMMDB3 is packaged in MINIMELF, so it might look like a unidirectional diode, but is symmetrical and therefore bidirectional.
Regards
/Peter
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