We don’t carry SMTSO-M3-6ET from PEM. Please review the similar part from Keystone Electronics part number 24884.
Datasheet – 24884_c Layout1 (1) (keystoneelectronics.net)
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.