DEC standard modular regulators

The DEC standard modular regulators (not a formal DEC term) were a series of modular power supply modules, used primarily in the H742 Power Supply of the BA11-F Mounting Box and the H765 Power System of the BA11-K mounting box. (They are also occasionally found in other locations.)

Supported regulators include:

• H744 +5V Regulator (and later versions, H7440 and H7441)
• H745 -15V Regulator
• H754 +20V, -5V Regulator

These regulators all used switching techniques (likely one of the earliest switching power supply designs); they differed from later switching supplies (which generally dispense entirely with a large transformer on the AC input, in that they take as input 30V AC supplied by the 'mother' system using a large (and heavy!) isolation/step-down transformer.

The 7014251 +12VB and +5VB Battery Backup Regulator, used with the H775D Battery Backup Unit, is another in the series.

Connectors

All use a common connector, an 8-pin 'Commercial MATE-N-LOK', made by AMP. The power harness uses a female shell (housing) with male pins (shell part #1-480460-0, pin part #60620-1); the regulators use a male shell with female pins (shell part #1-480459-0, pin part #60619-1).

There are a large number of different pin options: 30-22, 24-18, and 20-14 gauge; tin and gold plated; and brass and phosphor-bronze material. The part numbers given are for tinned brass, 20-14 gauge.

The Commercial MATE-N-LOK line is now made by TE Connectivity, who bought AMP. Unfortunately, they have ceased production on these two shells (although the pins are still being made). Some vendors still have stocks, though; as of July, 2018, ConnectorPeople and Quest still had some in stock.