The stand-off, who departed the Island last summer, dangerously tackled Reds wing George Watkins at a ruck in the first half of Ealing’s 19-13 Championship triumph but was not penalised by referee Christophe Ridley at the time.
The lack of action by Ridley infuriated Jersey boss Harvey Biljon but Penberthy was cited post-match and faced a disciplinary panel on Tuesday.
Penberthy is banned from 3 January to 23 January and will miss Ealing’s British & Irish Cup fixtures against Newport-Gwent Dragons Select and Yorkshire Carnegie.
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