Small Outline Diode (SOD) is a designation for a group of

semiconductor package A semiconductor is a material which has an electrical conductivity value falling between that of a conductor, such as copper, and an insulator, such as glass. Its resistivity falls as its temperature rises; metals behave in the opposite way. ...

s for surface mounted

diodes A diode is a two-terminal electronic component that conducts current primarily in one direction (asymmetric conductance); it has low (ideally zero) resistance in one direction, and high (ideally infinite) resistance in the other. A diode ...

. The standard includes multiple variants such as SOD-123, SOD-323, SOD-523 and SOD-923. SOD-123 is the largest, SOD-923 is the smallest.

References

Semiconductor packages {{Electronics-stub