The metal tab type has not been made for over 10 years, if you found some they are old stock or possibly fake.
Like Jazz said, you don't need the spacers for the plastic backed type.
Attached datasheet shows both types.
*EDIT TO-247 package does not have the back insulated and requires insulator.
If you do happen to have found some old style metal tab types, you not only need the mica spacers, but also special plastic washers for the screws.
Like Jazz said, you don't need the spacers for the plastic backed type.
Attached datasheet shows both types.
*EDIT TO-247 package does not have the back insulated and requires insulator.
If you do happen to have found some old style metal tab types, you not only need the mica spacers, but also special plastic washers for the screws.