Brown was sent off for the incident that took place four minutes into the second-half of Saturday’s dramatic 48-46 Gallagher Premiership victory over Wasps at Twickenham Stoop.
A disciplinary hearing decided that the accidental stamp warranted a high end sanction of 12 weeks which was reduced to six because of his unblemished disciplinary record and admission of guilt.
Even if Harlequins reach the Gallagher Premiership play-offs Brown will not be involved with only four rounds of the regular season left to play.
England’s most capped full-back joins Newcastle during the summer, meaning his 16-year career at Quins has come to an end.
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