Dual in-line package (known as DIP or DIL) is one of the most common among many kinds of IC packages with distinguishable measures, mounting styles, and/or pin-enumerations. In terms of microelectronics, a package of electronic components which has two parallel lines of electrical connecting pins and cased in a rectangular housing is known as dual in-line package. It can be either inserted in a socket or through-hole ascended to a printed circuit board. In 1964, Don Forbes, Bryant Rogers and Rex Rice invented the dual-inline ordination at Fairchild Research & Development. It was during that period, when the limited number of leads obtainable on circular transistor-style packages became a restriction in the application of integrated circuits. Additional signal and power supply leads are needed by the more and more complex circuits (according to the Rent’s rule); in the end, microprocessors and analogous complicated devices needed leads to a greater extent than could be put on a DIP package, which leads to the development of highly dense packages. Moreover, rectangular & square packages made it effortless to route printed-circuit traces underneath the packages.

A DIP is generally mentioned as a DIPn, where n is the aggregate number of pins. We can say for example, a DIP14 microcircuit package would consist of two rows of seven vertical leads. Most common DIP packages have four (lowest) to 64 (at most). Numerous digital and analog IC types are attainable in DIP package forms.