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Compact rectangular green circuit board with black 24-pin ATX connector and silver DC input jack, approx 154 x 35 x 15 mm

myVolts

myVolts Demeras 300W 12V DC AT Power Supply Module

SKU CH-5TG4-V0B2P

Compact 300W AT module converts 12V DC input to ATX power for mini-ITX and 1U cases

  • TypeAT
  • 300 W output powers mini-ITX and 1U builds
  • 12 V DC input with 25 A max current suits DC environments
  • 85 % efficiency reduces heat inside compact cases
  • Industrial solid capacitors withstand 0–55 °C operating range
  • Over-current and short-circuit protection guards connected hardware

DC Power Module for Compact Builds

The myVolts Demeras module delivers 300W output from a 12V DC source between 11.4 and 12.6V. It targets mini-ITX and 1U chassis where an internal ATX supply will not fit. A separate 12V adapter rated for at least 25A input current is mandatory for operation. Industrial solid capacitors support continuous use in embedded or server roles.

12V Input Constraint and Efficiency

The unit accepts only a narrow 12V DC window, so voltage drop on long cables can trigger shutdown. Peak input reaches 25A, demanding thick gauge wiring and a robust external brick. Rated efficiency sits at 85 percent, meaning roughly 45W becomes heat inside a small enclosure. No AC mains connection or PFC stage exists on the board.

Board Layout and Included Cables

The PCB measures approximately 154 by 35 by 15mm and weighs 189g with cables. A 24-pin ATX lead and a 24-to-20 pin adapter cover most motherboard headers directly. An auxiliary cable and a dedicated DC input lead ship in the box. Mounting holes suit standard ITX standoffs, leaving clearance for low-profile coolers.

Highlights

  • 300 W output powers mini-ITX and 1U builds
  • 12 V DC input with 25 A max current suits DC environments
  • 85 % efficiency reduces heat inside compact cases
  • Industrial solid capacitors withstand 0–55 °C operating range
  • Over-current and short-circuit protection guards connected hardware

Specifications

TypeAT

Questions about this item

Which DC input voltage range does the module accept?

The unit runs on 12V DC with an operating window of 11.4 to 12.6 volts and draws up to 25 amps from the external adapter.

What does the 300W rating deliver to the system?

At 85 percent efficiency the module supplies up to 300 watts to the 24-pin ATX connector, powering mini-ITX or 1U builds directly.

What connector standard is used for the motherboard link?

A 24-pin ATX cable is included, with a 24-pin to 20-pin adapter for boards that need the older pinout.

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