A DB37 cable usually means a 37-position standard-density D-Sub assembly, more precisely called DC37. The connector uses two rows of contacts and is popular for multi-channel industrial I/O, test/DAQ breakouts, and custom fan-out assemblies. The connector does not provide a universal electrical pinout.
DB37 vs DC37 Naming
In the original shell convention, a 37-position standard-density D-Sub uses the C shell, hence DC37. DB37 remains the common market name and is useful for search and procurement conversations.
On drawings, using DC37/37-position plus gender and part reference removes ambiguity.
How to Identify the 37-Position Connector
A standard-density DC37 has 37 positions in two rows, typically 19 + 18. Confirm whether the cable requires pins or sockets and note mounting/retention hardware and available backshell space.
Don’t confuse it with higher-density D-Sub families just because the shell looks similar.
Why DB37 Is Common in Industrial I/O
Thirty-seven positions give equipment designers room for many digital, analog, or control channels in one mechanically retained connector. That makes the format useful for PLC I/O, DAQ/test interfaces, and multi-channel breakouts.
The specific signals remain equipment-defined. A DB37 connector is not a protocol.
Breakout and Fan-Out Options
A DC37 cable may terminate to another DC37, a terminal block, bare wires, smaller D-Sub branches, or other connectors. For a fan-out, each branch needs its own mapping, label, and length.
Do not infer channel count from connector count. Build the fan-out from the host signal map.
What an Industrial RFQ Should Include
Provide equipment model, DC37 gender, destination termination, complete pinout, branch/trunk dimensions, shield/backshell requirement, label scheme, quantity, and test requirement.
For existing machines, send a verified original cable or equipment drawing before asking the factory to reproduce a proprietary mapping.
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 trunk and branch dimensions, backshell entry, retention, shielding, and branch-label requirements.
- State sample quantity, production quantity, and required electrical inspection.
Ordering Mistakes to Avoid
Assuming the 37 positions imply a standard I/O map; leaving branch labels undefined; or treating a fan-out as a generic cable.
Frequently Asked Questions
Is DB37 the same as DC37?
DB37 is common market shorthand; DC37 is the more precise shell designation for the 37-position standard-density D-Sub.
Does DB37 have a standard pinout?
No universal equipment pinout should be assumed.
Can DB37 break out to multiple DB9 connectors?
Yes, when the host equipment mapping is designed for that fan-out.
Need a Custom Cable or Compatibility Review?
For a DB37/DC37 cable or breakout, send the host equipment pinout, destination format, trunk/branch dimensions, labels, shielding, and quantity. BespokeCable can convert the host channel map into a controlled fan-out drawing.
