I've got a TCMT1102 Vishay optocoupler. Its a 4-pin SMD part but there is no standard package type associated on the datasheet - i.e SOP, SSOP, TSSOP etc. Vishay has a footprint document that describes this footprint as a "SOP-4 miniflat" according to the dimensions. Based on the footprint doc I assumed its a SOP-4. But when looking at the IPC-7351 standard, section 9 there is no description for a "SOP-4." The lowest SOP pin count is SOP-8. And when referencing this package classifications document there is no description for a SOP-4, SSOP-4, or TSOP-4.
Is SOP-4 a non-standard footprint? Where can I get this footprint?