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Black USB to 12V fan adapter cable with inline transformer and 4-pin connector, 50cm length

Darkside

Darkside USB to 12V Fan Adapter Cable 50cm Black DS-1043

SKU CH-E9KJ-F18V2

Converts a USB port to 12 V for a single 3-pin or 4-pin fan with a 50 cm cable

  • Cable length1.6 ft (0.49 m)
  • Powers 12 V fans from a USB port using built-in step-up transformer
  • Draws up to .5 A on USB 2.0 and .9 A on USB 3.0 without exceeding spec
  • 4-pin connector fits both 3-pin and 4-pin fans for broad compatibility
  • 50 cm length gives flexible routing inside compact cases
  • Black Jet Back sleeving protects wires and keeps build looking clean

USB 12 V fan adapter for low-power cooling

This cable converts a standard USB port into a 12 V supply for a single 3-pin or 4-pin fan. It is intended for builders who need a simple way to run a case or radiator fan from a motherboard header or powered hub without a dedicated fan controller.

Limited by USB current specifications

The integrated step-up transformer delivers 12 V but the source port caps available current at .5 A on USB 2.0 or .9 A on USB 3.0. Fans drawing more than the port rating will not spin reliably and may trigger port protection, so only low-power models are suitable.

Check fan current draw

Verify the fan’s rated amperage stays below the limit of the USB port you plan to use. A 50 cm / 1.6 ft cable length restricts placement to devices near the port, and the single 4-pin connector supports one fan only.

How it compares

Measured against everything we stock in Internal PSU & Riser Cables, at today’s prices. Recalculated every night.

Price $4.99
Cheaper than about 95% of the 7,839 comparable items (median $14.99).

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Specifications

Size & build
Cable length1.6 ft (0.49 m)

Questions about this item

Which length should I pick for a standard ATX case?

The cable is 50 cm long, which reaches most rear or top fan mounts from a motherboard USB header or rear port.

What does the 12 V output mean for my fan?

The built-in transformer steps the USB 5 V supply up to 12 V so a standard 12 V PWM or voltage-controlled fan runs at full speed.

How does the USB 2.0 versus 3.0 port affect the fan I can connect?

On a USB 2.0 port the adapter is limited to 0.5 A, so the fan must draw 0.5 A or less; on a USB 3.0 port the limit rises to 0.9 A.

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