SABRENT USB 2.0 to Serial DB9
4.4Editor score
Affordable price point
Fixed hex standoffs
Bus powered design
In this guide
Connecting legacy hardware to modern computers often requires a reliable D Sub to USB adapter. These converters bridge the gap between old serial ports and new USB interfaces ensuring seamless data transfer for industrial and professional equipment.
We compared ten top rated adapters based on chipset quality build durability and operating system support. Our analysis focuses on real world performance for connecting serial devices like PLCs routers and medical instruments without signal loss.
Each pick highlights specific strengths such as cable length warranty coverage and driver support. Prices and availability change frequently so verify current listings before purchasing to ensure you get the right adapter for your specific setup.
Top 3 Picks for Best D Sub to USB Adapter
USB to RS232 with FTDI Chipset
4.6Editor score
Reliable FTDI chipset
Supports multiple operating systems
Durable gold plated connectors
TRIPP LITE Keyspan High-Speed
4.6Editor score
High data transfer rates
Three year warranty
LED status indicator
Top 10 Best D Sub to USB Adapter in 2026 Compared
This side by side comparison reviews all ten adapters based on key technical specifications and user feedback. We examine chipset types cable lengths and compatibility to help you choose the right model for your specific serial device needs.
ProductsSpecificationsEditor scorePrice
Editor's Choice
USB to RS232 FTDI
FTDI Chipset
1Mbps Transfer Rate
Windows Linux Mac
6ft Cable Length
4.6Editor score
Editor's Choice
IOGEAR GUC232A
USB 1.1 2.0
LED Status Light
3 Year Warranty
12in Cable Length
4.7Editor score
Best Budget
SABRENT CB-DB9P
Prolific Chipset
Fixed Nut Design
460kbps Baud
All 9 Signals
4.4Editor score
BENFEI USB to Serial
Prolific Chipset
Triple Shielding
18 Month Warranty
6ft Cable Length
4.2Editor score
StarTech ICUSB232PRO
COM Port Retention
920kbps Speed
Professional Grade
1ft Cable Length
4.5Editor score
TRIPP LITE USA-19HS
230kbps Max Rate
LED Activity Light
3 Year Warranty
3ft Cable Length
4.6Editor score
StarTech ICUSB232V2
Prolific Chipset
512 Byte FIFO
17in Cable Length
3 Year Warranty
4.6Editor score
DTECH 10 Feet Adapter
FTDI Chipset
LED Light Indicator
10ft Cable Length
Gold Plated
4.6Editor score
UGREEN 6FT DB9
Prolific Chipset
256kbps Speed
Gold Plated
6ft Cable Length
4.6Editor score
StarTech ICUSB232DB25
Prolific Chipset
DB9 DB25 Support
512 Byte FIFO
3ft Cable Length
4.5Editor score
1. USB to RS232 with FTDI Chipset – Best Overall D Sub to USB Adapter
USB to RS232 with FTDI Chipset
FTDI Chipset
1Mbps Data Rate
Gold Plated USB
6 Foot Cable
This USB to RS232 adapter stands out for its reliable FTDI chipset which ensures stable connections across various operating systems. It receives high marks for its ability to connect legacy serial devices to modern USB ports without frequent disconnections.
Pros
- Reliable chipset driver support
- Wide OS compatibility
- Durable gold connectors
- No external power needed
- Clear product instructions
Cons
- Short cable length
- Male only connection
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The adapter supports Windows Linux and Mac OS making it versatile for different environments. Users appreciate the gold plated connectors that resist corrosion and maintain signal integrity over time. The 6-foot cable provides enough reach for most desktop setups.
Some users note the cable could be longer for industrial settings. The male only design limits compatibility with certain female port devices. However the build quality and chipset reliability outweigh these minor drawbacks for most professional applications.
If you need a dependable adapter for serial equipment this model is an excellent choice. Its broad compatibility and solid construction make it suitable for IT professionals and hobbyists alike who require consistent performance from their serial connections.
Reliable Chipset Performance
The FTDI chipset ensures stable driver support across multiple platforms reducing connection errors and dropouts.
Durable Connector Design
Gold plated USB RS232 connectors resist corrosion and maintain high performance for extended use.
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2. IOGEAR GUC232A – Ideal For GPS Devices
IOGEAR GUC232A
USB 1.1 2.0
LED Status Light
3 Year Warranty
12 Inch Cable
The IOGEAR GUC232A adapter is specifically designed for GPS devices and serial equipment requiring short reliable connections. Its standout feature is the LED status light which provides immediate visual feedback on data transfer activity.
Pros
- LED status indicator
- Remote wakeup support
- Long warranty period
- Low power consumption
- Universal compatibility
Cons
- Very short cable
- No Mac drivers included
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This adapter supports USB 1.1 and 2.0 standards and includes a 96 byte buffer for efficient data handling. The remote wakeup feature allows devices to wake the computer from sleep mode. A three year warranty provides long term peace of mind.
The 12-inch cable limits port flexibility compared to longer models. It requires drivers for Mac systems which may complicate setup for some users. Despite this the build quality and warranty support make it a solid choice for specific needs.
Choose this adapter if you need a compact solution for GPS or small serial peripherals. The LED indicator and warranty coverage are valuable features that enhance usability and reliability for everyday professional tasks.
Visual Data Feedback
An LED status light monitors data transfer providing instant confirmation of active connections.
Extended Warranty Coverage
A three year limited warranty offers significant protection and confidence in product longevity.
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3. SABRENT CB-DB9P – Best Budget Friendly Option
SABRENT CB-DB9P
Prolific Chipset
Fixed Nut Design
460kbps Baud
All 9 Signals
The SABRENT CB-DB9P offers an affordable entry point for users needing basic serial connectivity. It features a Prolific chipset that supports high baud rates up to 460kb8 ensuring efficient data transmission for most applications.
Pros
- Affordable price
- Fixed hex standoffs
- All nine signals wired
- Plug and play Windows
- One year warranty
Cons
- Driver issues on Mac
- Basic plastic housing
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All nine RS-232 signals are wired allowing full functionality with legacy hardware. The fixed hex standoffs provide secure locking connections preventing accidental disconnections during use. Windows users often experience automatic detection without extra driver installation.
Mac and Linux users may need to install drivers manually which adds a step to setup. The plastic housing feels less durable than metal alternatives. However the low cost and reliable performance make it a great value for occasional users.
Opt for this adapter if you need a cost effective solution for standard serial tasks. The secure locking design and high baud rates offer solid performance without breaking the bank for small office or home use.
Secure Connection Design
Fixed hex standoffs ensure stable connections by preventing accidental unplugging during data transfer.
Full Signal Support
All nine RS-232 signals are wired for complete compatibility with standard serial devices.
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4. BENFEI USB to Serial – Good Value with Long Cable
BENFEI USB to Serial
Prolific Chipset
Triple Shielding
18 Month Warranty
6 Foot Cable
BENFEI USB to Serial adapter delivers solid performance for general use at a competitive price point. It features triple shielding to reduce interference and maintain stable data transfer rates in noisy environments.
Pros
- Affordable pricing
- Triple shielded cable
- Longer cable length
- Good OS support
- Easy driver installation
Cons
- Lower build quality
- Chipset availability issues
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The six foot cable offers more reach than many compact adapters. This makes it suitable for setups where the computer is not directly next to the serial device. Compatibility spans Windows Mac and Linux with driver support available online.
Build quality is functional but less robust than premium alternatives. Some users report chipset version inconsistencies affecting driver installation. The eighteen month warranty provides moderate protection against manufacturing defects.
This adapter is a practical choice for standard serial connections where cost matters. The longer cable and shielding make it versatile for various setups while remaining affordable for budget conscious buyers.
Interference Protection
Triple shielding ensures stable data transmission by minimizing electrical interference in complex setups.
Extended Reach
A six foot cable provides flexibility for connecting devices that are not close to the computer.
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5. StarTech ICUSB232PRO – Professional COM Port Retention
StarTech ICUSB232PRO
COM Port Retention
920kbps Speed
TAA Compliant
1 Foot Cable
The StarTech ICUSB232PRO is designed for professionals who require consistent COM port assignments. Its nonvolatile memory retains assigned port values automatically reconnecting with the same port number when unplugged and reconnected.
Pros
- COM port memory retention
- High data rates
- TAA compliant
- Broad OS support
- Industrial grade build
Cons
- Very short cable
- Higher price point
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With transfer rates up to 920kbps it handles high speed serial data efficiently. TAA compliance makes it suitable for government and enterprise procurement. The compact one foot design fits easily into tight server racks or lab spaces.
The short cable limits placement flexibility but suits rack mounted applications. It commands a higher price than generic adapters. However the specialized features justify the cost for critical infrastructure maintenance and monitoring tasks.
Choose this model if you manage equipment requiring stable port configurations. The COM retention feature and high speed support make it ideal for IT professionals working in controlled environments where consistency is essential.
Port Assignment Memory
Nonvolatile memory retains COM port assignments ensuring automatic reconnection without manual reconfiguration.
Enterprise Readiness
TAA compliance meets government procurement standards for secure and trusted connectivity solutions.
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6. TRIPP LITE USA-19HS – Top Tier Reliability
TRIPP LITE USA-19HS
230kbps Max Rate
LED Activity Light
3 Year Warranty
3 Foot Cable
TRIPP LITE USA-19HS sets a premium standard for USB to serial adapters with robust construction and reliable performance. Its high speed data transfer supports demanding applications requiring consistent communication with legacy hardware.
Pros
- Premium build quality
- High transfer rates
- Visual activity indicator
- Long warranty term
- Universal compatibility
Cons
- Higher cost
- LED cannot be disabled
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The LED indicator offers visual confirmation of data activity enhancing troubleshooting capabilities. Supported across Windows Mac and Linux systems it provides broad versatility for mixed environments. A three year warranty reflects confidence in product durability.
The price exceeds many alternatives though quality justifies the investment. The LED cannot be turned off which might distract in dark control rooms. Despite this it remains a top choice for mission critical connectivity needs.
Invest in this adapter when reliability is non negotiable. Its combination of speed build quality and warranty protection makes it a dependable solution for professional environments where downtime is costly.
Visual Activity Monitoring
An LED light indicates data activity providing immediate visual confirmation of connection status.
Premium Long Term Value
A three year warranty delivers exceptional long term value and peace of mind for business use.
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7. StarTech ICUSB232V2 – IT Professional Standard
StarTech ICUSB232V2
Prolific Chipset
512 Byte FIFO
17 Inch Cable
3 Year Warranty
The StarTech ICUSB232V2 is engineered for IT professionals managing serial equipment across different systems. It supports baud rates up to 921.6 Kbps and features a 512 byte FIFO buffer for smooth data flow without loss.
Pros
- High baud rates
- Large FIFO buffer
- Lightweight design
- Multi-lingual support
- Broad OS support
Cons
- Limited portability
- Slightly higher price
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A seventeen inch cable balances portability with reach for desk setups. The adapter works seamlessly with Windows macOS and Linux offering broad platform compatibility. Free lifetime technical support provides valuable assistance for complex integrations.
While lightweight the plastic casing may not withstand rough field conditions. The price is moderate for its feature set. The warranty and technical support add significant value for enterprise users needing reliable connectivity.
Select this model if you manage diverse systems requiring high performance. The FIFO buffer and wide support make it ideal for network switches medical devices and industrial controllers in professional environments.
Efficient Data Buffering
A 512 byte FIFO buffer ensures smooth data transfer without loss during high activity periods.
Lifetime Technical Support
Free lifetime 24/5 multi-lingual technical assistance provides ongoing help for complex integrations.
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8. DTECH 10 Feet Adapter – Best Long Cable Option
DTECH 10 Feet Adapter
FTDI Chipset
10 Foot Cable
LED Indicator
Gold Plated
The DTECH 10 Feet Adapter solves reach issues with its extended cable length while maintaining high performance. Featuring an FTDI chipset it ensures stable driver support and reliable serial communication across modern operating systems.
Pros
- Extra long cable
- Reliable FTDI chip
- LED activity status
- Gold plated connectors
- Broad OS support
Cons
- Bulky cable management
- Higher price for length
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Gold plated connectors resist corrosion ensuring long term signal quality. The LED indicator provides visual feedback during data transmission. Ten feet of cable allows flexible device placement even when the computer is located remotely.
Managing a longer cable can be cumbersome in tight spaces. The price is higher than shorter adapters. However for setups requiring significant reach the convenience and reliability outweigh the extra cost for most users.
Choose this adapter when device distance is a constraint. Its combination of length chipset reliability and connector quality makes it ideal for industrial or remote monitoring applications where placement flexibility matters.
Extended Device Reach
A ten foot cable provides exceptional flexibility for connecting distant serial devices without signal loss.
Premium Connector Quality
Gold plated connectors ensure durable high quality connections that resist corrosion and signal degradation.
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9. UGREEN 6FT DB9 – Balanced Performance
UGREEN 6FT DB9
Prolific Chipset
256kbps Speed
Gold Plated
6 Foot Cable
The UGREEN 6FT DB9 adapter offers balanced performance for general serial connectivity needs. It supports transmission rates up to 256kbps and includes multiple shielding layers to protect data from signal loss and interference.
Pros
- Solid build quality
- Flexible PVC jacket
- Gold plated ports
- Driver free for Win8
- Affordable price
Cons
- Lower baud rate
- Manual driver install for macOS
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Gold plated connectors and flexible PVC jacket enhance durability and reduce tangling. Windows 8 and above enjoy driver free setup. The six foot cable provides adequate reach for most standard desktop setups without excess clutter.
Mac users must download drivers manually which adds a setup step. The baud rate is lower than premium models limiting high speed applications. Still its affordability and build quality make it a popular choice for general users.
Opt for this adapter for everyday serial tasks at a reasonable cost. Its durable construction and easy Windows compatibility make it a practical choice for office or home environments needing reliable connectivity.
Durable Cable Construction
Gold plated connectors and flexible PVC jackets ensure durability and prevent cable tangling during use.
Effortless Windows Setup
Driver free installation for Windows 8 and above simplifies setup for immediate use.
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10. StarTech ICUSB232DB25 – Versatile Multi Standard
StarTech ICUSB232DB25
DB9 DB25 Support
Prolific Chipset
512 Byte FIFO
3 Foot Cable
The StarTech ICUSB232DB25 supports both DB9 and DB25 standards offering versatility for diverse legacy hardware. Its screw lock nuts provide secure connections preventing accidental disconnections during operation in industrial or server room settings.
Pros
- Dual standard support
- Secure screw lock nuts
- Large FIFO buffer
- Broad device compatibility
- Enterprise warranty
Cons
- Slightly higher price
- Shorter cable length
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With a 512 byte FIFO buffer it handles data smoothly even during busy communication periods. Compatible with barcode readers medical devices and network switches it serves broad IT applications. Windows Mac and Linux are fully supported.
The three foot cable may limit placement options for distant devices. It costs more than basic adapters. However the dual standard support and enterprise features justify the investment for users managing varied serial equipment.
Select this adapter if you need to interface with multiple connector types. Its secure design and broad compatibility make it ideal for environments with mixed legacy hardware requiring reliable modern connectivity.
Dual Standard Compatibility
Supports both DB9 and DB25 devices offering flexibility for diverse legacy hardware configurations.
Secure Locking Design
Screw lock nuts on the connector ensure stable secure connections preventing accidental disconnections.
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Buying Guide – How to Choose the Best D Sub to USB Adapter
Selecting the right D Sub to USB adapter requires understanding your device needs and system compatibility. We break down the critical factors to consider before making your purchase.
Chipset Reliability
The chipset inside the adapter determines driver stability and data transfer quality. FTDI and Prolific chipsets are industry standards known for broad OS support and consistent performance. Avoid adapters with unknown chipsets as they may cause frequent connection drops or require difficult manual driver installation.
Connector Gender
Confirm whether your device requires a male or female DB9 connector. Most adapters are male to plug into female device ports. Mismatched gender will prevent physical connection. Verify your device's port configuration before ordering to avoid returns or extra adapters.
Cable Length
Cable length affects setup flexibility. Short cables work for desktop setups while longer ones suit industrial installations. Ensure the length matches your workspace needs without excessive slack or tension on the port which could damage connectors over time.
Operating System Support
Check that the adapter supports your specific operating system version. Windows 11 and 10 often have native drivers but Linux and macOS usually require downloads. Confirm driver availability for your OS before purchase to avoid compatibility issues after installation.
Baud Rate Requirements
Some devices require high baud rates for fast data transfer. Most adapters support standard rates up to 230kbps or higher. Ensure the adapter meets your device minimum speed requirements to prevent slow or failed communication in data intensive tasks.
Build Quality
Construction materials impact durability and signal integrity. Gold plated connectors resist corrosion while shielded cables reduce interference. Industrial environments benefit from metal housings and screw lock connectors that secure the link against accidental disconnections.
Warranty and Support
A solid warranty indicates manufacturer confidence in product quality. Look for at least one year coverage with accessible customer support. Reliable technical assistance helps resolve driver issues quickly reducing downtime in professional or critical operational settings.
Price vs Features
Balance cost against necessary features. Basic adapters work for simple tasks while premium models offer COM retention and enterprise warranties. Avoid overspending on features you won't use but invest enough for reliability in critical workflows where failure is costly.
How to Use and Care for Your D Sub to USB Adapter
Install drivers before connecting the adapter. Download the latest version from the manufacturer website or use included media to ensure compatibility. Plug the USB end into your computer first to allow system recognition before connecting the serial device.
Avoid bending or pinching the cable near the connectors. Keep the adapter in a clean dry environment to prevent dust buildup and corrosion. Use cable ties or clips to manage slack and reduce strain on the ports during regular use.
Regularly check for driver updates from the manufacturer. Reinstall drivers if connection issues occur or if you upgrade your operating system. For industrial use periodically inspect connectors for physical damage to maintain reliable long term performance.
Frequently Asked Questions
Will a D Sub to USB adapter work with my old serial printer?
Yes most adapters work with serial printers that use RS-232 DB9 ports. Ensure the adapter supports your printer's baud rate and pin configuration. Check the product description for printer compatibility before purchasing to avoid connectivity issues.
Do I need to install drivers for Windows 11?
Many modern adapters have native support for Windows 11 but some still require manual driver installation. Check the product page or manufacturer website for Windows 11 driver downloads to ensure full functionality.
Can I use this adapter for video connections like VGA?
No USB to serial adapters are for data communication only not video. They transmit serial data signals not video signals. Using them for VGA or DVI will not work and may damage connected devices if incorrectly plugged in.
How do I know if my device is serial or parallel?
Serial devices use DB9 or DB25 connectors with 9 or 25 pins for data transmission. Parallel ports typically have 25 pins but differ in pin layout and purpose. Consult your device manual or check the connector label to confirm the interface type.
What happens if the adapter gets disconnected during use?
Some adapters lose their COM port assignment requiring reconfiguration. Models with COM retention memory remember the port number automatically. Reconnect and check Device Manager to verify the port reappears correctly without manual changes.
Is USB 3.0 faster than USB 2.0 for serial adapters?
Serial data rates are limited by the adapter and device not USB version. USB 2.0 is sufficient for most serial applications. USB 3.0 ports provide backward compatibility but won't increase serial communication speeds beyond chipset limits.
Final Thoughts on Choosing the Best D Sub to USB Adapter
These ten adapters offer reliable solutions for connecting legacy serial hardware to modern systems. Our top picks cover budget friendly options professional grade models and versatile choices for different needs and environments.
Prioritize chipset reliability and operating system support when making your selection. Invest in quality connectors and cable length that match your specific setup requirements to ensure long term durability and performance.
Remember prices and availability change frequently so verify current listings before purchasing. Check for driver updates and compatibility notes specific to your operating system version for the smoothest setup experience.