On-chip clock regulator and OTP ROM now combined with built-in RS232 transceiver. Even lower BOM cost and smaller footprint. learn more


Lower Cost with 0.18µm process, lower operating and suspend current & supports USB-IF Logo Test Requirements. learn more


System-level ESD protection learn more


Mini footprint and low component count in a SOT8 package. learn more

NEW! Android USB OTG to Serial Cable

You can now connect your serial device to your Android Tablet or Smartphone directly, without the need for any other converter cable or adapter!

Our USB to serial bridge cables provide seamless communication between serial devices and Windows, Mac, Android and Linux platforms over their USB ports. Built round the Prolific PL2303HXD chipset, these cables support all the features of that chipset. Furthermore, as the first company to develop USB to serial bridge chips over 15 years ago, you can be confident that Prolific’s drivers and development tools will make it easy and painless for you to equip your serial device to support the popular hardware platforms and OS’s. As an OEM or VAR you can be confident that the cables you bundle or recommend will match the high quality and performance of your own product.

Android USB OTG to Serial Cable

Prolific USB to Serial Adapters

The PL2303 is a family of USB to serial bridge controllers which can connect a variety of serial devices to a USB host, allowing full RS232/422/485 or TTL communications. By simulating COM ports, these chips make serial devices and applications USB-ready.

By taking advantage of USB bulk transfer mode, large data buffers, and automatic flow control, the PL2303 achieves higher throughput than traditional UART's. The flexible baud rate generator can be programmed to generate any rate between 75 bps to 12M bps.

With a small footprint and low power consumption in either operating or suspend mode, the PL-2303 is perfect for bus powered operation with power left for attached devices. Flexible signal level requirement on the RS232-like serial port side also allows the PL2303 to connect directly to any 3.3V~1.8V range devices.

USB to Serial Adapters

Prolific Storage Device Controllers

Prolific Storage Device Controllers offer both USB 2.0 and SuperSpeed USB 3.0 controllers. The line is made up of low-power, single-chip USB-to-SATA compliant bridge controllers that are designed to perform seamless protocol transfer between USB Host and SATA interface storage devices like Hard Disk Drives, Optical Disk Drives, and Solid-State Drives. All are implemented according to the USB Bulk-Only Mass Storage Class Specification. Additionally, all are backward compatible and interoperable with lower USB protocol devices, hosts and hubs.

A high performance 8-bit microcontroller, which can be used to support versatile system applications such as one button backup, power control, and other USB port features, is integrated into each controller.

Storage Device Controllers

Prolific USB Host to Host & General Purpose Controllers

Host to Host

The Prolific host to host bridge controllers are single chip solutions designed for file transfer, networking and resource sharing over USB host ports. They can be used with Windows Easy Transfer cables and Microsoft Windows Easy Transfer program or Prolific’s ULinq software. Computers can be connected in a peer-to-peer network in various configurations, without the overhead and complicated configurations of Ethernet networks.

General Purpose

The PL2551 is a single chip Hi-Speed USB 2.0 General-Purpose Microcontroller (MCU). It provides customers a cost-effective and time-to-market USB device controller solution. With a diversity of IO ports and peripherals, it can easily interface with various external devices and applications such as motion sensors, modems, CMOS sensors, medical/healthcare, industrial, fingerprint, security, and others. Flexible endpoint configuration, including its buffer partition, allows users to easily establish control of isochronous in/out (ISO), bulk-in/out or interrupt in/out (INT) pipes to communicate with the USB host

USB Host to Host & General Purpose Controllers