Electronics / USB Hubs & Docking
User Manual for StarTech 109B-USBC-HDMI Dual HDMI Adapter
Quick-start guide for the StarTech 109B-USBC-HDMI adapter. Learn how to connect dual 4K displays, set up power delivery, and configure your host computer.
Table of contents
Quick Start Guide
This document provides instructions for setting up the StarTech 109B-USBC-HDMI adapter. This device allows you to connect two HDMI displays to a single USB-C or USB-A host port and supports USB Power Delivery pass-through to charge your host computer.
Package Contents
- 1 x USB-C/USB-A to HDMI Adapter
- 1 x Quick-Start Guide
Components Overview
The adapter features the following components:
- HDMI Output 1 & 2: Ports for connecting to HDMI displays.
- USB-C Host Connection: Connects to your computer.
- USB-C to USB-A Adapter: Attached adapter for use with USB-A enabled computers.
- Power Delivery Pass-through Port: USB-C port for connecting a power adapter to charge the host computer.
Driver Installation
Installation is automatic for Windows 10 and up, and ChromeOS. If the drivers do not auto-install, contact your IT administrator. If you are using macOS or another supported operating system, the latest drivers are available at www.StarTech.com/109B-USBC-HDMI.
Installation Steps
- (Optional) Power Delivery: Connect a USB-C Power Adapter (up to 100W) from an AC outlet to the Power Delivery Pass-through Port on the adapter to charge the host computer. Note: A USB-C port with Power Delivery on the host is required for this feature. PD pass-through is not available when using the USB-A adapter.
- Connect Host: Connect the USB Host Connection to an available USB-C or USB-A port on your computer.
- Connect Displays: Connect an HDMI cable (sold separately) from HDMI Output 1 to your first HDMI display.
- Connect Second Display: Connect an HDMI cable (sold separately) from HDMI Output 2 to your second HDMI display.
- Configure: Arrange the display settings using your operating system's Display Settings menu.
Official resources from the manual
Practical help
Common problems
Drivers not installing automatically
Contact your IT administrator or download the latest drivers from the StarTech support website.
Power Delivery not charging the host
Ensure the host computer's USB-C port supports Power Delivery. Note that PD pass-through is disabled when using the USB-A adapter.
Before use
- Verify your host computer has a compatible USB-C or USB-A port.
- Ensure you have two HDMI cables available for your displays.
- If charging is required, have a USB-C power adapter ready.
- Check for the latest drivers on the StarTech website if using macOS.
Specs in practice
- USB Power Delivery 3.0
- Supports up to 100W input, providing up to 90W for host charging.
Images and diagrams
- The adapter includes a built-in USB-C cable with a detachable USB-A adapter, two HDMI output ports, and a dedicated USB-C Power Delivery port.
Model compatibility
- Compatible with Windows 10 and up, and ChromeOS.
- Power Delivery pass-through is not available when using the USB-A adapter.
Manual page author
Emily Carter
User documentation editor
Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.