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  • PC/104 Bus 30/40Watt DC/DC Power Supply
  • Up to 85% Efficiency
  • Three Input Voltage Versions:
    • 12V Nominal, 9VDC-18VDC (30W)
    • 24V Nominal, 18VDC-36VDC (40W)
    • 48V Nominal, 36VDC-75VDC (40W)
  • Triple Output Voltage:
    • (12V version is 30Watt Max)
    • +5VDC up to 5A
    • +12VDC up to 800mA (not to exceed 30W total)
    • -12VDC up to 800mA (not to exceed 30W total)
  • Voltage Status LEDs
  • Reverse Power Protection on Inputs
  • Resettable Fused Input Line
  • Fully Protected Outputs
  • Can be populated on either side of the board to allow for heat-sinking in fanless application requirements
  • Temperature range with heatsink -40 to +50°C, up to 105°C with derating of 1.3% per °C (no air flow)
Last updated on November 2, 2023, 6:31 pm


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Triple Output DC/DC PC/104 Power Module

The design incorporates a 16-bit pass through PC/104 connector, molex power input connector and voltage status LED’s. Since heat is always a factor to consider in any system design project, the DC/DC converter can be populated on either side of the board to facilitate heat sinking to one end of an enclosure, with the CPU heat sinking to the other end of the enclosure.This triple output version can be ordered with or without a heatsink. At up to 85% efficiency, a dynamic input range and full protection on inputs and outputs, this power supply is very versatile and appropriate for many PC/104 based applications.

The Input Power Connector is a Four-pin standard Molex type connector at the edge of the board. It’s the same connector as used on a CD-ROM so it’s easy to set up and test a system with a local +12V computer power supply.

Fully software transparent, the 104-PWR-512 occupies no resources; zero I/O memory locations, IRQs, DMA channels or bandwidth of any types are consumed. Compatible with all operating systems and software.

Drivers and Downloads

Full list of available Downloads: Software Packages, Drivers, Manuals, and other documents

Information about our Free Software packages:

ACCES is proud to provide a full suite of software support with every Data Acquisition product. We are committed to supporting the most popular operating systems and platforms for our customers. Currently we are actively supporting XP -> 10, both 32 & 64 bit, including “Server 2008,” “Embedded,” and “Compact” flavors for all plug-and-play products including PCI, PCI Express, USB, and more. Many products continue to ship with support for additional operating systems such as DOS, Windows 95, 98, Me, NT4, and 2000.


Among the software we deliver with our products are sample programs in a wide variety of programming languages. These samples are used to demonstrate the software interfaces to our products — and many can be used as-is in your production environments, or to test functionality of the devices out-of-the-box. We’re currently actively supporting sample programs in Microsoft Visual C#, Visual Basic, Delphi, and Visual C/C++, with many devices including samples in Borland C/C++ 3.1 for DOS. Additionally we provide National Instruments LabVIEW compatible DLLs and many demonstration VIs for our devices.


Drivers for various operating systems are also provided, including active support for Windows XP -> 10 — all in both 32-bit and 64-bit flavors, and including consumer, server, and embedded varieties — as well as the 2.6 and newer Linux kernels and recent OSX / macOS versions. Many products continue to ship with driver support for Windows 95, 98, Me, NT4, and Windows 2000, but support for these operating systems is considered deprecated.

Setup Programs and Utilites

Our Data Acquisition devices also include a graphical setup utility that walks you through the process of configuring any option jumpers or switches on the device, as well as explaining a little about the various connectors present.

Many devices also include utility programs – little tools to make your use of the device easier, such as EWriter, a program that allows you to read and write data in the user-accessible EEPROM locations on all our USB data acquisitition products; or WinRISC, a “Really Incredibly Simple Communications” terminal program that lets you get started instantly with serial devices.

“Register Level” Documentation

Besides all this software in all these languages and operating systems ACCES has a policy of open and transparent development: none of our lowest-level “register” interfaces are hidden from you — we document every register in every bus card, every command in every serial board, and every usb control transfer in every USB Data Acquisition board. These lowest-level interfaces allow you to develop for our products in ANY operating system or language, regardless of our actively supporting it or having a driver for it. We have customers actively developing in ADA, Android, Python, Java, MATLAB, Solaris, and more, just by referring to our complete low-level interface documentation! And we provide the full source code to all of our drivers, regardless of operating system, to give you an even bigger head start in your own development tasks.

No Fees or Royalties

All of this software is provided at no additional charge, and is licensed under any of a variety of flexible — and royalty free — options. Check out our software license explanation if you’d like more information.

Custom Software

ACCES also offers Custom Software Services for our products. Our prices are unbelievably low, often as inexpensive as free! If you need something tweaked to support your needs, or an entire enterprise application developed from scratch, it is definitely worth your time to inquire with us, first.

Further information about available ACCES Software:

Redistributing Windows Drivers
A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.

Output Characteristics

  • OutputVoltage Set Point on 5V: ±1%, Factory set
  • OutputVoltage Set Point on ±12V: ±5%, Factory set
  • Ripple/Noise on 5V: 1% P-P measured at 20MHz bandwidth
  • Ripple/Noise on ±12V: 1% P-P measured at 20MHz bandwidth
  • Short Circuit Protection: Continuous
  • Overvoltage Protection: 135% Clamp type

Input Characteristics

Input Characteristics 12 24 48 Unit/Comments
Input Voltage 9-18 18-36 36-75 VDC
Under Voltage Shut Down 8 16 30 VDC (min)
Over Voltage Shut Down 25 45 80 VDC (max)
Minimum Input Current 660 330 185 A (min)
Full Load Input Current 3.541 2.00 0.992 A (max)
Efficiency by Model 80 83 85 % (typ)
Switching Frequency 360 to 440 KHz, Factory set
Operating Temperature -40 to +50 °C, up to 105°C with derating of 1.3% per °C (no air flow)
Storage Temperature -55 to +125 °C
Relative Humidity 5 to 95 %, non-condensing

CE testing & approval must be done at the system level, in the designed enclosure, and is not done on individual boards.

ModelDescriptionPrice (USD)
104-PWR-512A is discontinued