The closest substitute for MP111A-E we have in-stock is LFXTAL003515BULK from IQD Frequency Products.
Please review the above part and verify if the differences in operating temperature, frequency stability/tolerance, and size will work with your application needs prior to ordering.
The TechForum Cross Reference category is for parts that Digi-Key does not sell or parts that have gone obsolete. Our Engineers and Techs have reviewed the specifications for these parts and made a recommendation for a replacement. Please review the suggested part to ensure it will work for your application.