I had to look that one up. A small outline integrated circuit (SOIC) is a surface-mounted integrated circuit (IC) package which occupies an area about 30–50% l

I had to look that one up. A small outline integrated circuit (SOIC) is a surface-mounted integrated circuit (IC) package which occupies an area about 30–50% less than an equivalent dual in-line package (DIP), with a typical thickness being 70% less. They are generally available in the same pin-outs as their counterpart DIP ICs. https://en.wikipedia.org/wiki/Small_outline_integrated_circuit https://en.wikipedia.org/wiki/Small_outline_integrated_circu... I suspect companies do these make collisions intentionally.