Converters and Power Supplies for the Communications, Automotive & Marine Industries



If you need to fit 24V equipment onto a 12V electrical system, then an “up” converter from the DD Series offers a fast and easy way to configure your system. Now with a range from 72W (3A output) to 600W (25A output), these products offer state of the art designs for fast installation and long term reliable operation. Typical applications include the installation of 24V equipment on 12V vehicles and
installation of specialist equipment requiring higher operating voltages.

400W AND 600W 12–24V UNITS

The latest addition to the range includes two high current (17 and 25 Amps output) units. These use state of the art designs with efficiency up to 93% and practically all components are mounted using computer controlled surface mount technology (SMT). The result is a robust product with low component mass. The mechanical aspects include a brand new casing profile designed for maximum heat dissipation as well as a new design of our highly successful mounting cradle that allows the unit to be fully wired before being “clicked” into place. This provides for a faster installation time with mechanics capable of withstanding long term vibration with no risk of screws falling out.


12V–24V converters are available in two casing formats. Units from 72-240W use the standard Alfatronix aluminium casings with polycarbonate endcaps and three point mounting cradle. The larger 400W and 600W units occupy a larger heatsink casing and utilise the
heavy duty Phoenix connector. Installation is by way of the larger four point 'I' shaped mounting cradle.


The DD Series 12–24V products are available in either standard IP53 format (like most Alfatronix converters) or the ruggedised IP65 versions. Just add –RU to the part number. These are suitable where the installation is in a particularly hostile environment and subject to
increased water and dirt exposure.

Choose your DD Series 12-24V ‘UP' Product


Part Number Power Nominal Voltage Dimensions (mm) Weight (g)
DD12-24 072 72W (3A) Non-Isolated 12Vdc in, 24Vdc out 89 x 87 x 50 300
DD12-24 168 168W (7A) Non-Isolated 12Vdc in, 24Vdc out 167 x 87 x 50 640
DD12-24 240 240W (10A) Non-Isolated 12Vdc in, 24Vdc out 217 x 87 x 50 820
DD12-24 400 400W (16A) Non-Isolated 12Vdc in, 24Vdc out 233 x 125 x 74 1610
DD12-24 600 600W (25A) Non-Isolated 12Vdc in, 24Vdc out 283 x 125 x 74 1860

 Other output voltage configurations are available as special orders, please ask our sales team


Input voltage range 12 Vdc nominal (10.0V-15.0V)
Output voltage 27.2Vdc +/-5% at extremes of temperature, load, input tolerance, etc.
Continuous current rating
3A - 25A depending on model.
Intermittent rating Continuous rating +20%, taken for a maximum of 2 minutes followed by 8 minutes rest
Transient voltage protection Meets ISO7637-2 International standard for 24Vdc commercial vehicles
Electrostatic voltage protection Meets ISO10605, ISO14892, >8kV contact, 15kV discharge
Output noise <100mV pk-pk at continuous load. 
Off load current (quiescent current) <20mA (400W and 600W versions enable off), less than 100mA (72-240W units)
Power conversion efficiency Typically: 93%
Operating temperature -25ºC to +30ºC to meet this specification table
+30ºC to +80ºC de rate linearly to 0A
Storage temperature -25ºC to +70ºC
Operating humidity 95% max., non-condensing
Casework Anodised aluminium, glass filled polycarbonate, dust water and impact resistance to IP533.
Ruggedised versions also available to IP65
Connections Four 6.3mm push on flat blade connectors (72-240W)
Five terminal connector with screw tightening with mating half supplied (400 and 600W units)
Output indicator Green LED adjacent to output terminals
Mounting method ‘Click ‘n' fit mounting clip, fitted separately using 3 hole fixing (4 hole on 400 and 600W)
Safe area protection: Over current   Limited by current sensing circuit
Over heat Limited by temperature sensing circuit
Transients Protected by filters and rugged component selection
Input/Output over voltage protection Controlled by internal circuitry
Catastrophic failure Protected by internal input and output fuses
Approvals 2004/108/EC The general EMC directive
2006/96/EC The automotive directive
93/68/EEC The CE marking directive
Markings CE and e marked