A DB50 cable usually refers to a 50-position D-Sub assembly, more precisely designated DD50 in the original shell-size naming system. Current manufacturer literature shows the standard-density 50-position connector in the D-shell with three rows. It is a high-contact-count connector, but it is not the same thing as a high-density 78-position D-Sub.
DB50 vs DD50 Naming
DB50 is the common market term. DD50 is the precise shell designation: D shell, 50 positions. Using both terms in an engineering drawing is useful when supplier or customer naming conventions differ.
The important physical checks remain contact count, row layout, gender, and mating hardware.
Three Rows Do Not Automatically Mean ‘High-Density’
A DD50 standard-density connector uses three rows because of its large contact count, while the D-Sub family also has separate high-density configurations such as the 78-position DD78. Therefore, ‘three rows’ and ‘high density’ should not be treated as synonyms.
Use manufacturer connector data or an exact mating-part reference when identifying a legacy DB50 port.
Where 50-Position D-Sub Cables Are Used
The format is useful in industrial I/O, test/DAQ, telecom, and legacy equipment where many conductors must pass through one retained connector. Applications may include straight assemblies, breakouts, or fan-outs.
None of these uses creates one universal DB50 pinout.
Pinout and Cable Construction
Obtain the equipment wiring schedule before manufacturing. Define active, spare, and NC positions, shield/shell connections, cable grouping, and any branch mapping.
Because a 50-conductor assembly can become bulky, also check cable diameter, backshell entry, and bend space.
DB50 Procurement Checklist
Confirm DD50/50-position three-row interface, gender, other-end termination, equipment pinout, finished length, cable construction, shield/back-shell, retention hardware, labeling, and quantity.
For repeat OEM orders, approve a drawing and test map rather than reordering from ‘DB50 cable’ alone.
Buyer / Engineer Checklist
- Confirm the exact equipment model and port function.
- Identify connector type, contact count, row layout, and cable-side gender.
- Use an approved pinout, equipment manual, or verified original sample.
- Define DB50 cable construction, backshell capacity, finished length, shielding, and any breakout requirements.
- State sample quantity, production quantity, and required electrical inspection.
Ordering Mistakes to Avoid
Calling every large D-Sub ‘high-density’; assuming a universal DB50 map; or freezing the cable before checking backshell entry and bend space.
Frequently Asked Questions
Is DB50 the same as DD50?
DB50 is common market shorthand; DD50 is the more precise D-shell 50-position designation.
Is DB50 a high-density connector?
The common 50-position DD50 is a standard-density D-Sub configuration with three rows; high-density D-shell variants can use more positions.
Does DB50 have a universal pinout?
No. Verify the connected equipment.
Need a Custom Cable or Compatibility Review?
For a DB50/DD50 assembly, send the equipment drawing or verified sample, connector gender, destination termination, pin map, cable/backshell construction, and quantity. BespokeCable can create a repeatable cable rather than a generic 50-pin lead.
