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Black USB-A to 4-pin Molex female adapter cable

HETAI Digital Technology Co.,Ltd

HETAI Digital Technology Co.,Ltd USB Cable 4 Pin Molex Fan Computer Case Cord 4Pin Female

SKU CH-34KK-9PBDJ

Powers a 4-pin Molex case fan from any USB port using a Micro-USB to USB-A adapter cable

  • Connector TypeMicro USB to USB A
  • Powers 4-pin Molex fans from any USB port
  • Micro USB to USB A connector fits standard sockets
  • New condition ensures reliable operation from first use
  • Simple adapter replaces internal power cables for clean builds
  • Ideal for case fans needing 5 V USB supply

What this cable does

The HETAI USB cable provides a 5 V power path from a USB‑A port to a 4‑pin Molex fan header inside a computer case. It lets builders run case fans without occupying a motherboard fan header or a dedicated PSU connector.

Steady power delivery

Because the cable draws from the USB‑A port’s 5 V rail, the fan receives a constant voltage as long as the host system is powered. There is no boost or regulation circuitry, so fan speed stays proportional to the port’s current limit rather than spiking under load.

Replaces a Molex branch

This adapter replaces a traditional Molex Y‑splitter when the power supply lacks spare 4‑pin connectors or when the builder prefers a cleaner cable run. It is not suited for high‑current devices such as pumps or RGB controllers that exceed the USB port’s rated output.

Highlights

  • Powers 4-pin Molex fans from any USB port
  • Micro USB to USB A connector fits standard sockets
  • New condition ensures reliable operation from first use
  • Simple adapter replaces internal power cables for clean builds
  • Ideal for case fans needing 5 V USB supply

Specifications

Connector TypeMicro USB to USB A

Questions about this item

Will the USB-to-Molex cable generate noticeable heat or fan noise when powering a case fan continuously?

The adapter itself is passive and produces no noise; any heat or sound comes from the fan you connect, not from the cable.

What must I already have to use this Micro USB to 4-pin Molex adapter?

You need a standard USB-A power source (such as a PC port, wall charger or power bank) and a 4-pin Molex fan or device to plug into the female connector.

Can I run an older 4-pin Molex case fan from a modern USB-A port using this cable?

Yes — the cable delivers 5 V from any USB-A port to the Molex fan, so legacy fans spin without a traditional PSU connector.

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