DB9 Connector

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DB9 Connector

DB9 connectors have been a common serial port connection for decades. Nine positions are available for data transfer and the shell automatically grounds to the chassis. These nine pin connectors come in vertical or right-angle orientations for top or side entry of cables. D-subs are available in a wide range of plating options to meet application cycles plus a wide range of mounting options for very secure connections.


DB9 Connector | EDAC

What is a DB9 Connector?

The DB9 connector (originally named DE-9) is an analog socket, with 9 pins, from the D-Subminiatures (D-Sub) connector family. The DB9 has the smallest "footprint" of the D-Subminiature connectors. The prefix “D” represents the D-shape of the connector shell. The DB9 connector is mainly used in serial ports, allowing asynchronous data transmission according to the RS-232 standard (RS-232C). Note that there are DB9-DB25 adapters that easily convert a DB9 socket to DB25 and vice versa.

DB9 Connector pin

DB9 Connector pin 2

DB9 Engineering option

There are at least three types of cable end D-Sub connectors. They are differentiated by the method used to attach the wires to the contacts: soldering, insulation displacement or crimping.

1. DB9 DSUB connector with Solder Contacts

The solder contacts have a cavity into which the stripped and tinned wire is inserted and then soldered.

DB9 D-Sub solder contacts

2. DB-9 DSUB connector with Insulation displacement contacts (idc or i.d.c)

The insulation displacement contacts (I.D.C.) are designed for automated assembly. A flat cable is pressed against the contacts, the rear of which is fork-shaped, which then pierce the insulation of all the wires simultaneously.


3. DB9 DSUB connector with Crimped contacts

The crimp contacts are wired by inserting a stripped end of wire into a cavity at the back of the contact. The cavity is then crimped using a crimping tool. The contact is then inserted into the connector. Pins can be removed later with a tool inserted into the back of the connector. This "rear disconnect" is useful when the pins on the device are damaged.

db9 dsub crimped contacts


There are also two types of PCB mounted connectors, straight or right-angle termination styles. This type of connector has built-in solder tails for easy mounting on a PCB.

STRAIGHT termination -


RIGHT-ANGLE termination -



D-Sub backshells enclose the junction between the conductors in a cable and the contacts in the connector assembly. These are available in plastic for standard applications, or metal for industrial applications.

d-sub backshell db9 connector

Other commonly known D-subs are DB15 connectors and DB25 connectors.

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