Best USB Serial Adapters of 2025

The Gearmo USB to Serial Adapter with LED Indicators is a 5ft long serial adapter that connects old DB-9 serial communication devices to modern computers with USB. It features a full LED dual-color display for testing RS-232 host to device link easily. This adapter supports multiple OS platforms including Windows 7, 8, 10, and 11, as well as Linux and MacOS 10.X. Gearmo is a reliable and superior-built product and offers CAD, Mechanical Drawings, and Data Sheets.

The Tripp Lite Keyspan High-Speed USB to Serial Adapter connects a serial device to a USB computer with plug-and-play convenience. It draws power directly from your computer and supports data transfer rates up to 230 Kbps, twice the speed of a standard built-in serial port. The DB9 serial port is seen as a COM port by your computer, and is available for use by any program that accesses COM ports. Additionally, an LED shows adapter status and data activity at a glance.

The StarTech.com USB to Serial RS232 Adapter is a portable and versatile device that allows you to connect, monitor, and control a serial device through USB. It features broad compatibility with USB 1.0 or 2.0 ports and works with Windows, Mac, or Linux systems. The adapter also supports fast transfer speeds up to 921.6Kbps and is USB-powered, requiring no additional power adapter. Its lightweight design makes it ideal for professionals on the go.

The BENFEI USB to RS232 Male Serial Adapter allows you to connect serial devices such as modems, barcode scanners, and PDAs to your computer through a USB port. It features a standard USB Type A Male to Male 9-pin DB9 RS-232 serial connector and has a data transfer rate of 1Mbps. The adapter is compatible with a wide range of platforms, including Windows, MacOS, and Linux, and it comes with a Prolific PL-2303 chipset. The triple shielding and tinned copper conductor ensure the best data transfer rate, and it's powered by the USB port so there's no need for an external power adapter.

The OIKWAN USB to RS232 Adapter with FTDI Chipset is a high-quality, reliable and convenient solution for connecting serial devices to your Windows, MAC or Linux system. The latest FTDI chipset ensures fast and stable operation, while the gold-plated USB RS232 connector and PVC cable provide excellent performance and durability. With plug-and-play installation, this USB-powered adapter cable supports a transfer rate of up to 1Mbps and can be used with a wide range of devices, including modems, scanners, printers and more.

The StarTech.com USB to RS232 Serial DB9 Adapter Cable is a professional-grade solution that offers broad compatibility for connecting legacy or industrial RS232 serial devices to a laptop or desktop computer through USB. The adapter retains assigned serial COM port values in nonvolatile memory to automatically be assigned to the adapter serial port if disconnected and reconnected. With versatile functionality, this USB serial adapter is used to connect, monitor, and control industrial sensors and equipment, as well as control LED and digital signage boards.

The HiLetgo CP2102 USB 2.0 to TTL Module is a stable and reliable serial adapter that allows you to connect your MCU to your computer with ease. It features a standard USB type A male and TTL 5pin connector, with pins for 3.3V, RST, TXD, RXD, GND, and 5V. It supports a wide range of baud rates, from 300 bps to 1.5 Mbps, and is compatible with Windows, Mac OS, and Linux.

The DSD Tech USB to TTL Serial Adapter with FTDI FT232RL Chip allows you to communicate with your board/MCU through your computer. It has a maximum transmission speed of up to 3Mbps and an LED indicator for TX, RX, and power. With pin definitions for CTS, RTS, RXD, TXD, GND, and VCC, this adapter also supports VCC output of 3.3V and 5V, switchable by jumper. It is compatible with Windows 10, 8, 7 and Mac OS X, making it a versatile option for various systems.

The OIKWAN USB Serial Adapter is designed to connect your serial DB9 devices, like modems or printers, to a USB port on your computer. It features a 9-pin female connector, ensuring compatibility with your devices. With its FTDI chipset, this adapter supports a wide range of operating systems, including Windows and Mac OS, making it versatile for various users. The plug-and-play functionality means you can easily start using it without additional power sources, as it draws power directly from your computer. This convenience allows you to streamline your connections quickly and efficiently.

The Atnsinc USB TTL Adapter is a stable and reliable chipset CP2102 that supports a full range of STC single-chip microcomputers with output voltage of 3.3V and 5V. It is compatible with various operating systems including Windows, Mac OS, and Linux. With baud rates ranging from 300 bps to 1.5 Mbps, it supports high-speed data transmission up to 115200 bps. The adapter features a standard USB type A male connector and a TTL 5pin connector, making it easy to connect your microcontroller to your computer. The built-in indicator LEDs provide visual feedback for power status, data reception, and data transmission. The Atnsinc USB TTL Adapter is perfect for USB to TTL electronic projects, offering convenience and reliability for your UART STC communication needs.