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D-subminiature Connectors

D-subminiature Connectors

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 metalic shell. The shell provides mechanical support and electical 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.

DB connector nomenclature explained    

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 NameCommon NamePinsRows
DA
d-sub DA-15 (DB-15) 15 pin subminiature connector
DA-15
DB-15
15 2
DB
d-sub DB-25 25 pin subminiature connector
DB-25
DB-25
25 2
DC
d-sub DC-37 (DB-37) 37 pin subminiature connector
DC-37
DB-37
37 2
DD
d-sub DD-50 (DB-50) 50 pin subminiature connector
DD-50
DB-50
50 3
DE
d-sub DE-09 (DB-9) 9 pin subminiature connector
DE-09
DB-9
  9 2
D-subminiature (D-sub) High Density Connectors
Shell
Pinout
Correct NameCommon NamePinsRows
DA
d-sub DA26 (DB26-HD, HD-26) 15 pin subminiature connector
DA-26
DB-26HD, HD-26
26 3
DB
d-sub DB-44 (DB44-HD, HD-44) 44 pin subminiature connector
DB-44
DB-44HD, HD-44
44 3
DC
d-sub DC-62 (DB-62HD, HD-62) 62 pin subminiature connector
DC-62
DB-62HD, HD-62
62 3
DD
d-sub DD-78 (DB-78HD, HD-78) 78 pin subminiature connector
DD-78
DB-78HD, HD-78
78 4
DE
d-sub DE-15 (DB-15HD, HD-15) 15 pin subminiature connector
DE-15
DB-15HD, HD-15
15 3
D-subminiature (D-sub) Double Density Connectors
Shell
Pinout
Correct NameCommon NamePinsRows
DA
d-sub DA-31 (DB-31DD, DD-31) 31 pin subminiature connector
DA-31
DB-31DD, DD-31
 31 3
DB
d-sub DB-52 (DB-52DD, DD-52) 52 pin subminiature connector
DB-52
DB-52DD, DD-52
 52 3
DC
d-sub DC-79 (DB-79DD, DD-79) 15 pin subminiature connector
DC-79
DB-79DD, DD-79
79 3
DD
d-sub DD-100 (DB100-DD, DD-100) 100 pin subminiature connector
DD-100
DB-100DD, DD-100
100 4
DE
d-sub DE-19 (DB-19DD, DD-19) 19 pin subminiature connector
DE-19
DB-19DD, DD-19
  19 3
               Note: The P or S final character has been omitted from the above tables.