The mini-DIN connectors are a family of multi-pin electrical connectors used in a variety of applications. Mini-DIN is similar to the larger, older DIN connector. Both are standards of the Deutsches Institut für Normung, the German standards body.
Mini-DIN connectors are 9.5 millimeters (3⁄8 in) in diameter and come in seven patterns, with the number of pins from three to nine. Each pattern is keyed in such a way that a plug with one pattern cannot be mated with any socket of another pattern. An important aspect of why each of these 7 mini-DIN connectors is official standards is that they are each drastically different from the other, with no simultaneously and directly overlapping similarities in (1) pin arrangement, (2) square key size and position, (3) circular shielding metal skirt notches and metallic additions - unlike the nonstandard mini-DIN connectors which may have directly overlapping characteristics to each other or to the standard mini-DIN connectors.
Some notable examples of standard mini-DIN connectors include:
- Mini-DIN-3 connectors were used in early implementations of Apple LocalTalk.
- Mini-DIN-4 connectors are used for S-video, and were used for Apple Desktop Bus.
- Mini-DIN-6 connectors were used for IBM PC compatible PS/2 keyboard and mouse ports and for Acorn Archimedes keyboards (prior to the A7000 were proprietary, A7000 and later were standardized PS/2).
- Mini-DIN-8 connectors were used for Sun Microsystems keyboard and mouse ports, as well as for serial printer, modem, and Apple LocalTalk connections. It was also used as the gamepad connector for the PC Engine video game system and its variants (except the TurboGrafx-16 USA variant, which used a full-sized DIN-8)
- Mini-DIN-9 connectors were used for Acorn Archimedes Quadrature Mice and Microsoft InPort Bus Mice (not interchangeable). It is also used as the Audio/Video output port of Sega Genesis/Mega Drive gaming consoles on Model 2 variants, as well as their 32X add-on.
- Mini-DIN-7 and Mini-DIN-9 connectors have been used for a variety of audio and video applications. Also, iRobot Roomba Vacuum cleaning robots use a Mini-DIN-7 to expose an interface for custom sensing and control.
- Mini-DIN-6 and Mini-DIN-8 connectors are frequently used in ham radio applications to interface with computers for data packet communications and radio programming.