A small-outline integrated circuit (SOIC) is a surface-mounted

Surface-mount technology

Surface mount technology is a method for constructing electronic circuits in which the components are mounted directly onto the surface of printed circuit boards . An electronic device so made is called a surface mount device...

 integrated circuit

Integrated circuit

An integrated circuit or monolithic integrated circuit is an electronic circuit manufactured by the patterned diffusion of trace elements into the surface of a thin substrate of semiconductor material...

 (IC) package which occupies an area about 30–50% less than an equivalent DIP

Dual in-line package

In microelectronics, a dual in-line package is an electronic device package with a rectangular housing and two parallel rows of electrical connecting pins. The package may be through-hole mounted to a printed circuit board or inserted in a socket.A DIP is usually referred to as a DIPn, where n is...

, with a typical thickness that is 70% less. They are generally available in the same pinout

Pinout

In electronics, a pinout is a cross-reference between the contacts, or pins, of an electrical connector or electronic component, and their functions.- Purpose :...

s as their counterpart DIP ICs. The convention for naming the package is SOIC or sometimes just SO followed by the number of pins. For example, a 14-pin 4011 would be housed in an SOIC-14 or SO-14 package.

Small-outline J-leaded package (SOJ) is a version of SOIC with J-type leads instead of gull-wing leads.
SOIC actually refers to at least two different package standards.