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Black USB-A to DB9 serial cable with moulded connectors and thumbscrews

BENFEI USB to RS-232 DB9 Serial Adapter 1.8M

SKU CH-17AG-4EKT0

Connects legacy DB9 serial devices to a USB port using a Prolific PL-2303 chipset with 1.8 m cable

  • Cable lengthInches
  • Adapter typeDB9
  • First connectorDB9
  • Second connectorDB9
  • Units per package1
  • Product typeDB9
  • Connects legacy serial gear via USB
  • Prolific PL-2303 chipset for broad OS support
  • 8 m cable reaches distant ports
  • Tinned copper conductors with triple shielding
  • Powered by USB port, no external adapter

USB to RS-232 DB9 Adapter

This BENFEI cable converts a USB Type-A port into a standard DB9 male serial connector. It uses the Prolific PL-2303 chipset to link legacy serial equipment such as modems, barcode scanners, label writers and industrial gear to modern computers. The 1.8 metre cable is powered from the USB port and requires a one-time driver installation before use.

Engineers maintaining serial hardware

Technicians configuring routers, GPS units, PDAs or ISDN terminal adapters will find the full RS-232 signal set including RTS, CTS, DSR, DTR, DCD and RI useful. Buyers who need a USB-to-VGA video link or a gender changer for existing DB9 cables should look at a different product because this adapter only provides a serial data path.

Prolific PL-2303 chipset

The PL-2303 controller determines operating-system support across Windows 11 down to 98, Mac OS X 10.6 and later, and Linux kernel 2.4.0 onward. If your target system lacks a driver for this chipset the adapter will not enumerate as a COM port.

How it compares

Measured against everything we stock in USB Adapter Cables & Dongles, at today’s prices. Recalculated every night.

Price $14.99
Typical for this category: the median of 1,430 items is $14.99.

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Specifications

Product
Brand nameBENFEI
Model name000151
Part number000151black
Product typeDB9
Product colorBlack
Adapter typeDB9
Ports & slots
First connectorDB9
Second connectorDB9
Size & build
Cable lengthInches
Product dimensions1.0 in × 1.0 in × 1.0 in
Product weight1 oz
In the box
Units per package1

Questions about this item

Which BENFEI USB-to-serial cable length should I pick?

The adapter ships with a 1.8 m cable; no other lengths are offered for this model.

What throughput will I actually see on the RS-232 side?

The Prolific PL-2303 chipset delivers up to 1 Mbps over the DB9 link, which is the practical limit for connected serial gear.

Does the USB 2.0 interface cap the speed below 1 Mbps?

USB 2.0 provides far more bandwidth than the adapter's 1 Mbps serial rate, so the RS-232 side remains the bottleneck.

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