D-subminiature (D-sub) connectors were invented by Canon ITT in 1952 and are now in common use on a plethora of IT equipment. They have 2, 3 or 4 rows of pins (male) or sockets (female) surrounded by an elongated D-shaped metallic shell. The shell provides mechanical support and electrical screening and it's D-shape ensures correct plug and socket orientation. Connector contacts are spaced 2.74 mm apart with the rows spaced 2.84 mm apart.
Nomenclature The correct format to specify a D-sub connector is shown below. The initial letter D (for D-subminiature) is followed by a letter denoting the shell size (A, B, C, D or E). A hyphen then preceeds two or three digits that are used to denote the number of pins. The final character is either P (plug) or S (socket) to denote the gender.
There are numerous examples of misused nomenclature in everyday use such as the DE-09 connector being commonly (and erroniously) being called a DB-9. Also, the final character is often either M (Male) or F (Female) instead of P or S. The hypen is often omitted.
D-subminiature connectors are divided into three groups; Standard Density, High Density and Double Density. The following tables show the correct names and the commonly-used names for all D-subminiature connectors.
Clicking on a pinout drawing will provide additional information about that particular connector.
D-subminiature (D-sub) Standard Density Connectors
Shell Pinout Correct Name Common Name Pins Rows DA DA-15 DB-15 15 2 DB DB-25 DB-25 25 2 DC DC-37 DB-37 37 2 DD DD-50 DB-50 50 3 DE DE-09 DB-9 9 2
D-subminiature (D-sub) High Density Connectors
Shell Pinout Correct Name Common Name Pins Rows DA DA-26 DB-26HD, HD-26 26 3 DB DB-44 DB-44HD, HD-44 44 3 DC DC-62 DB-62HD, HD-62 62 3 DD DD-78 DB-78HD, HD-78 78 4 DE DE-15 DB-15HD, HD-15 15 3
D-subminiature (D-sub) Double Density Connectors
Shell Pinout Correct Name Common Name Pins Rows DA DA-31 DB-31DD, DD-31 31 3 DB DB-52 DB-52DD, DD-52 52 3 DC DC-79 DB-79DD, DD-79 79 3 DD DD-100 DB-100DD, DD-100 100 4 DE DE-19 DB-19DD, DD-19 19 3