New Industry Products

COSEL Adds 80 Watt DC/DC Converters to its Popular STMGFS Platform

September 29, 2021 by Gary Elinoff

The new converters accommodate inputs of 9-36V or 18-76V and also offer adjustable outputs of 3.3, 5, 12, or 15 volts.

COSEL’s two versions of its new 80 watt STMGFS80 converters will round out the company’s existing 15 and 30 watt devices. The new unit features the same footprint as its 30 watt predecessor, facilitating easy upgrades.

Members of COSEL’s STMGFS family of DC/DC Converters. Image courtesy of COSEL


The STMGFS80 is based on the company’s MGFS80 DC/DC converter modules, now assembled onto a carrier board. The new unit includes a potentiometer which is used to make adjustments of the output voltage. It also features terminal blocks, extra capacitors, and an input filter. DIN rail mounting is available as an option.

The STMGFS80 endows the MGFS80 DC/DC converter modules with a rugged mechanical platform and industrial mount packaging. These augmentations, in addition to the other features described, make the STMGFS80 suitable for tough industrial settings.


The Two Models

The STMGFS80 series consists of the STMGFS8024 and the STMGFS8048

STMGFS8024 operates from inputs over a 9VDC to 36VDC input range, enabling it to be powered by the 12V and 24V industrial power rails.

Its counterpart, the STMGFS8048, can accept power inputs from 18VDC to 76VDC, allowing it to work with common 24 and 48V systems.

Because in both cases, the highest acceptable input voltage is four times greater than the lowest acceptable voltage, these units can be described as having 4:1 input ranges.

The two models provide a choice of three outputs:

  • 3.3V at 18A
  • 5V at 16A
  • 12V at 6.7A
  • 15V at 5.4A

Each of the outputs can be adjusted, ±10%, via the potentiometer included on the motherboard.


Flexible Mounting Options

Both STMGFS80 versions can be mounted directly onto an equipment chassis. The converter can also be attached to a DIN rail by means of COSEL’s (N2) option. If needed, a plastic cover is available. By Q2 of 2022, the company expects that a combined DIN rail and cover option will be available.



  • Both versions of the STMGFS80 feature efficiencies of up to 92%
  • Overvoltage protection kicks in at between 115% and 140% of rating
  • Overcurrent protection. At 105% of specification, the converter enters hiccup mode
  • The devices feature remote On/Off control
  • Isolation

                    ○ Input and RC (On/Off) to Output: 1500VDC

                    ○ Input and RC to chassis ground:1000VDC

                    ○ Output to chassis ground: 1,000VDC

Complete information can be found on the datasheet.



The new converters will find application in the following industries:

  • Energy
  • Industrial
  • Transportation
  • Communications


Physical Considerations

  • Both STMGFS80 models operate over a temperature range of -20 to +70℃ temperature range. Derating may apply, depending on ventilation and assembly methods.
  • The units are cooled by convection/forced air
  • Without an optional cover or a DIN rail attachment, dimensions are 52 x 29 x 117mm (2.05 x 1.14 x 4.61 inches). The converters weigh a maximum of 170g.


Regulatory and Safety

The new units adhere to:

  • UL62368-1
  • C-UL EN62368-1 
  • European Low Voltage Directives
  • RoHs
  • European REACH Directive