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Tiny black rectangular DC-DC ATX power supply unit

Mini-Box

Mini-Box picoPSU-90 12V DC-DC ATX power supply

SKU CH-WEMT-889DX

A 90 W, 12 V DC-DC ATX power supply for low-power embedded systems, including P4 cable

  • Product typeAT
  • World's smallest ATX supply fits tight builds
  • 90 W output powers low-draw embedded systems
  • 12 V DC input simplifies car or rack installs
  • Includes P4 cable for direct motherboard connection
  • 1U rack-mount compliant for space-limited servers

Ultra-compact 12 V DC-DC ATX unit

The picoPSU-90 is a 90-watt power supply that plugs directly into a motherboard ATX connector and draws power from an external 12 V source. Its tiny footprint makes it suitable for embedded PCs, thin clients and 1 U rack appliances where space is at a premium. Builders using Intel Atom boards or similar low-draw platforms can power the system without a conventional PSU cage. It ships with a P4 auxiliary cable for CPU power.

12 V input and 90 W output ceiling

The unit accepts a single 12 V DC feed and converts it to the ATX rails required by the board. Total continuous output is capped at 90 watts, so the external adapter must supply at least that much power at 12 V. No internal fan is present, meaning airflow in the chassis must carry away the heat generated by the DC-DC conversion. The AT form factor limits compatibility to motherboards with a matching 20-pin main connector.

Handles Atom-class loads; not for discrete graphics

At 90 watts the supply comfortably runs an Atom processor, memory, solid-state storage and a few onboard peripherals. Adding a dedicated graphics card, multiple spinning drives or high-wattage expansion cards will exceed the rating and cause instability. Systems needing more headroom should consider the 120-watt sibling or a standard ATX power supply. The compact design leaves no room for extra PCIe power connectors.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $46.99
Cheaper than about 91% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeAT

Questions about this item

Should I choose the 90 W model or the 120 W model?

Choose the 90 W unit if your embedded system draws up to 90 watts from a 12 V source; step up to the 120 W version only when the load regularly exceeds that level.

What does the 90 W rating mean once the unit is installed in a Mini-ITX build?

It is the maximum continuous power the DC-DC converter can deliver to the ATX rails while running from a 12 V input, so the total component draw must stay at or below 90 watts.

What interface does the picoPSU-90 use and what does it limit in practice?

It plugs directly into the motherboard's 20-pin ATX socket and draws 12 V DC from an external brick, capping the system to the 90 W output rating of the converter.

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