SABRENT USB 2.0 to Serial DB9 RS232 Male Adapter Cable
4.4Editor score
Prolific Chipset support
Fixed nuts for secure connection
Bus powered design
In this guide
Finding the right D Sub to USB adapter is essential for connecting legacy serial devices to modern computers. These adapters bridge the gap between old hardware and new technology, ensuring seamless data transfer and device control without needing outdated ports.
We evaluated ten top-rated models based on chipset reliability, build quality, and OS compatibility. Our analysis focuses on real-world performance, driver support, and durability to help you choose the adapter that best fits your specific technical requirements and workflow needs.
Each pick below highlights key features, pros, cons, and ideal use cases for different scenarios. Please note that prices and availability can change frequently, so verify current details before purchasing to ensure you get the best value for your investment today.
Top 3 Picks for Best D Sub to USB Adapter
USB to RS232 USB Serial Adapter with FTDI Chipset
4.6Editor score
FTDI Chipset for reliability
Supports Windows Mac Linux
Six feet cable length included
TRIPP LITE Keyspan High-Speed USB to Serial Adapter
4.6Editor score
High speed data transfer
LED status indicator light
Three year limited warranty
Top 10 Best D Sub to USB Adapter in 2026 Compared
The following table provides a side-by-side comparison of all ten selected adapters. This overview highlights key specifications, chipset types, and cable lengths to help you quickly identify the model that meets your connectivity needs.
ProductsSpecificationsEditor scorePrice
Editor's Choice
USB to RS232 USB Serial Adapter with FTDI Chipset
FTDI Chipset included
6 feet cable length
Windows Mac Linux support
1Mbps transfer rate
4.6Editor score
Editor's Choice
IOGEAR USB to PDA/Serial (DB9) Adapter
USB 1.1 and 2.0
12 inch cable length
LED status light
3 year warranty
4.7Editor score
Best Budget
SABRENT USB 2.0 to Serial DB9 RS232 Male Adapter Cable
Prolific Chipset included
Fixed hex standoffs
All 9 signals wired
Bus powered design
4.4Editor score
BENFEI USB to Serial Adapter
Prolific Chipset support
6 feet cable length
Triple shielding design
18 month warranty
4.2Editor score
StarTech.com 1 ft. USB to RS232 Serial DB9 Adapter Cable
COM Port retention feature
1 foot cable length
920 kpbs max speed
TAA compliant
4.5Editor score
TRIPP LITE Keyspan High-Speed USB to Serial Adapter
High speed adapter
3 foot cable length
LED activity indicator
3 year warranty
4.6Editor score
StarTech 17in 1-Port USB to Serial Adapter Cable
Prolific Chipset included
17 inch cable length
921.6 Kbps max
3 year warranty
4.6Editor score
DTECH 10 Feet USB 2.0 to RS232 DB9 Serial Port Adapter Cable
FTDI Chipset included
10 feet cable length
Gold plated connector
LED status light
4.6Editor score
UGREEN 6FT DB9 Male 9 Pin USB to Serial Adapter
Prolific Chipset included
6 feet cable length
Gold plated interface
256kbps transfer rate
4.6Editor score
StarTech 3ft 1-Port USB to Serial Cable
Prolific Chipset included
3 feet cable length
Screw lock nuts
2 year warranty
4.5Editor score
1. USB to RS232 USB Serial Adapter with FTDI Chipset – Best Overall D Sub to USB Adapter
USB to RS232 USB Serial Adapter with FTDI Chipset
FTDI Chipset included
6 feet cable length
Windows Mac Linux support
1Mbps transfer rate
This adapter stands out for its use of the FTDI chipset, which is widely regarded as the gold standard for USB to serial conversions. It holds a solid rating from users who need dependable connectivity for industrial and legacy devices.
Pros
- Highly reliable chipset
- Wide OS compatibility
- Long cable length
- Plug and play
- Durable connector design
Cons
- Requires driver download
- Not video adapter
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The six-foot cable provides ample reach for connecting devices that may be placed away from the computer. It supports a wide range of operating systems including Windows, Mac, and Linux, making it versatile for diverse environments.
While it requires an initial driver download from the official website, the process is straightforward. The adapter is not a video solution, so users must ensure they need serial communication specifically.
It is the ideal choice for professionals who prioritize reliability and long-term stability over the lowest price point. We recommend this for critical applications where connection drops are not an option.
Reliable Chipset Performance
The FTDI chipset ensures stable data transfer and minimizes compatibility issues across different operating systems.
Extended Cable Reach
At six feet, this cable offers more flexibility than shorter alternatives found in the market.
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2. IOGEAR USB to PDA/Serial (DB9) Adapter – Best for GPS Devices
IOGEAR USB to PDA/Serial (DB9) Adapter
USB 1.1 and 2.0
12 inch cable length
LED status light
3 year warranty
IOGEAR offers a robust solution specifically noted for converting serial interfaces on GPS units to USB. It maintains a high user rating due to its reliability and specific utility for navigation devices.
Pros
- LED status indicator
- Remote wakeup support
- Strong warranty
- Compatible with GPS
- Low power consumption
Cons
- Shorter cable length
- Older USB 1.1 support
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The LED status light provides immediate visual feedback during data transfers, which is helpful for monitoring active connections. It supports remote wakeup and power management features for modern laptop efficiency.
The cable length is relatively short at twelve inches, which might limit positioning options for some setups. It also supports older USB 1.1 standards which may be slower than newer 2.0 options.
This adapter is perfect for users who primarily work with serial GPS devices or PDAs and need a quick visual confirmation of data activity.
Visual Data Monitoring
The built-in LED light allows users to quickly verify data transfer status at a glance.
GPS Device Compatibility
Specifically designed to handle the unique requirements of serial GPS hardware units.
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3. SABRENT USB 2.0 to Serial DB9 RS232 Male Adapter Cable – Best Value D Sub to USB Adapter
SABRENT USB 2.0 to Serial DB9 RS232 Male Adapter Cable
Prolific Chipset included
Fixed hex standoffs
All 9 signals wired
Bus powered design
SABRENT provides a cost-effective option that does not compromise on essential functionality. It is well-regarded for its fixed hex standoffs which help secure the connection during use.
Pros
- Affordable price point
- Fixed nuts secure fit
- All signals connected
- No external power
- High baud rates
Cons
- Driver needed for some OS
- Not a video adapter
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All nine signals are properly wired ensuring full functionality with devices that require DCD, RXD, TXD, and other control lines. It supports high baud rates up to 460,800 bps for fast data exchange.
Drivers are generally automatic on newer Windows versions but may need manual installation on other systems. The fixed nuts can sometimes be difficult to adjust depending on the port depth.
For budget-conscious users needing reliable serial access, this adapter offers excellent performance per dollar without sacrificing critical connectivity features.
Secure Connection Design
Fixed hex standoffs prevent the adapter from loosening during active data transmission.
Full Signal Support
Every signal line is wired to ensure compatibility with complex industrial equipment.
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4. BENFEI USB to Serial Adapter – Best Long Cable D Sub to USB Adapter
BENFEI USB to Serial Adapter
Prolific Chipset support
6 feet cable length
Triple shielding design
18 month warranty
BENFEI distinguishes itself with a six-foot cable that provides excellent reach for desktop and workshop setups. The triple shielding helps maintain signal integrity over the longer distance.
Pros
- Six feet cable length
- Triple shielding reduces noise
- Tinned copper conductors
- Long warranty period
- Wide OS support
Cons
- Moderate rating score
- Not for video output
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It uses Tinned Copper Conductors to ensure reliable electrical connections and minimize data loss. The adapter is bus-powered so no additional power supply is needed for operation.
The rating is slightly lower than top contenders but still indicates general user satisfaction. The eighteen-month warranty offers good peace of mind for consumers concerned about durability.
This model is particularly suitable for workstations where the computer is far from the serial equipment and signal shielding is important.
Enhanced Signal Shielding
Triple shielding protects data lines from interference even at the full six foot length.
Extended Warranty Coverage
An eighteen-month warranty provides extended protection beyond standard one-year offerings.
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5. StarTech.com 1 ft. USB to RS232 Serial DB9 Adapter Cable – Best Enterprise D Sub to USB Adapter
StarTech.com 1 ft. USB to RS232 Serial DB9 Adapter Cable
COM Port retention feature
1 foot cable length
920 kpbs max speed
TAA compliant
StarTech offers a professional solution designed for IT environments where port consistency is crucial. The COM port retention feature ensures the adapter keeps the same port number when plugged back in.
Pros
- COM port retention
- TAA compliant
- Professional grade build
- 920 kbps speed
- Versatile integration
Cons
- Short cable length
- Higher price point
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Being TAA compliant makes this adapter suitable for government procurement contracts. It supports high-speed data transfers up to 920 kpbs for efficient communication with industrial sensors.
The cable is short at one foot which restricts physical placement to the immediate area of the computer. This often comes at a higher price compared to consumer-grade alternatives.
Choose this adapter if you are managing multiple devices in a server room or lab where port identification must remain consistent.
Port Identification Stability
Nonvolatile memory retains COM port values to prevent configuration issues.
Government Compliance
TAA compliance ensures eligibility for specific public sector purchasing programs.
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6. TRIPP LITE Keyspan High-Speed USB to Serial Adapter – Best Premium D Sub to USB Adapter
TRIPP LITE Keyspan High-Speed USB to Serial Adapter
High speed adapter
3 foot cable length
LED activity indicator
3 year warranty
TRIPP LITE delivers a premium experience with high-speed data transfer capabilities that exceed standard serial ports. It is favored for its robust build quality and extensive warranty coverage.
Pros
- Very high data speed
- LED activity light
- No external power
- Long warranty period
- Dual OS support
Cons
- Premium price point
- Shorter cable length
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The LED indicator gives instant feedback on data activity which helps troubleshoot connection issues quickly. It draws power directly from the USB port removing the need for a separate brick.
While the price is higher, the three-year warranty provides significant long-term value for business users. The three-foot cable is convenient for desktop use but may not reach distant devices.
This is the ideal premium choice for mission-critical applications where data speed and reliability are paramount.
High Speed Transfers
Supports data rates up to 230 Kbps which is twice the speed of built-in serial ports.
Long-Term Warranty
Three-year limited warranty ensures protection against defects for a long period.
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7. StarTech 17in 1-Port USB to Serial Adapter Cable – Best for IT Pros
StarTech 17in 1-Port USB to Serial Adapter Cable
Prolific Chipset included
17 inch cable length
921.6 Kbps max
3 year warranty
StarTech targets IT professionals with a lightweight and durable adapter designed for on-the-go troubleshooting. It supports up to 921.6 Kbps baud rates for fast configuration tasks.
Pros
- Lightweight portable design
- High baud rates
- 24/5 technical support
- Multiple parity modes
- Compatible with switches
Cons
- Short cable length
- Premium price
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The 24/5 multilingual technical assistance adds significant value for business users who need quick help. It supports various parity modes and data bits for versatile device compatibility.
The seventeen-inch cable is portable but limits reach in larger racks. It is priced higher than generic alternatives due to the professional support and build quality.
Choose this for field work or data center maintenance where portability and quick support are essential.
Professional Technical Support
Free lifetime 24/5 multi-lingual technical assistance ensures quick resolution of issues.
Portable Design
Lightweight casing fits easily into carrying cases for mobile professionals.
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8. DTECH 10 Feet USB 2.0 to RS232 DB9 Serial Port Adapter Cable – Best Long Reach D Sub to USB Adapter
DTECH 10 Feet USB 2.0 to RS232 DB9 Serial Port Adapter Cable
FTDI Chipset included
10 feet cable length
Gold plated connector
LED status light
DTECH provides the longest cable option at ten feet making it perfect for connecting distant industrial equipment. The FTDI chipset ensures stable performance similar to the top-rated model.
Pros
- Ten feet cable length
- Gold plated connector
- Reliable FTDI chipset
- LED status indicator
- Wide OS support
Cons
- May require driver setup
- Not for video use
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Gold-plated connectors and an LED status light enhance durability and ease of monitoring. It supports standard pinouts for broad compatibility with various serial devices.
The blue enriched injection design gives a durable and aesthetically pleasing finish. Users should verify pinout requirements as not all devices need all signal lines active.
This is the best choice when distance is a primary constraint and you still need reliable chipset performance.
Maximum Reach
The ten-foot length solves connection challenges in large workshops or industrial spaces.
Durable Connectors
Gold plating resists corrosion and ensures long-lasting electrical contact.
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9. UGREEN 6FT DB9 Male 9 Pin USB to Serial Adapter – Best Reliable Option
UGREEN 6FT DB9 Male 9 Pin USB to Serial Adapter
Prolific Chipset included
6 feet cable length
Gold plated interface
256kbps transfer rate
UGREEN offers a reliable adapter with multiple shielding layers that protect signal integrity. It supports driver-free usage on Windows 8 and above which simplifies setup for modern users.
Pros
- Strong shielding layers
- Driver free for Win8
- Flexible PVC jacket
- Gold plated connectors
- Universal OS support
Cons
- Limited to 256kbps
- Driver needed for older OS
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The flexible PVC jacket manages cable length effectively and prevents tangling in busy environments. Gold-plated interfaces ensure durable physical connections for daily use.
Transmission rates are capped at 256kbps which is sufficient for most legacy serial applications. Drivers are still required for older Windows versions and Linux systems.
This is a solid everyday adapter for general serial device connectivity where standard speeds are acceptable.
Driver Free Modern OS
Automatic detection on Windows 8 and newer systems reduces setup time.
Signal Protection
Multiple shielding layers prevent data loss from electromagnetic interference.
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10. StarTech 3ft 1-Port USB to Serial Cable – Best Versatile D Sub to USB Adapter
StarTech 3ft 1-Port USB to Serial Cable
Prolific Chipset included
3 feet cable length
Screw lock nuts
2 year warranty
StarTech provides a versatile adapter that works with both DB9 and DB25 devices through secure screw lock nuts. This ensures connections remain stable during operation in industrial settings.
Pros
- DB9 or DB25 support
- Secure screw lock nuts
- 3 foot cable length
- 2 year warranty
- Wide device compatibility
Cons
- Moderate transfer speed
- Not video compatible
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The three-foot cable offers a good balance between portability and reach for most desk setups. It supports a wide range of devices including barcode readers and PLCs for diverse applications.
The maximum baud rate is 230.4 Kbps which is standard for many legacy devices. It includes free lifetime technical assistance to help users resolve configuration issues quickly.
Choose this when you need secure screw connections and compatibility with older DB25 ports.
Secure Connections
Screw lock nuts prevent accidental disconnections during use.
DB25 Compatibility
Works with both DB9 and DB25 interfaces for broader hardware support.
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Buying Guide – How to Choose the Best D Sub to USB Adapter
Selecting the right adapter requires understanding chipset compatibility, cable length, and specific connector needs. Here are key factors to consider.
Chipset Type
The chipset determines reliability and driver stability. FTDI chipsets are generally considered superior due to broader OS support and fewer conflicts. Prolific chipsets are common and affordable but may require careful driver selection.
Prioritize FTDI if you need maximum stability for professional work.
Cable Length
Cable length impacts how far your devices can be from the computer. Standard lengths range from one foot to ten feet depending on the model. Ensure the cable reaches comfortably without stretching.
Choose longer cables for industrial setups and shorter ones for portability.
Connector Gender
Most adapters provide a male DB9 end to connect to female ports on legacy devices. Always verify the gender of your target port to avoid buying incompatible hardware.
Confirm gender before purchasing to prevent returns and delays.
Operating System Support
Ensure the adapter explicitly supports your OS. Windows 11 and 10 often detect modern adapters automatically but older versions may require manual drivers. Mac and Linux support should also be confirmed on the product page.
Verify driver availability for your specific operating system version.
Data Transfer Speed
Serial data transfer rates vary significantly between models. Standard rates go up to 230 Kbps but some high-speed options reach 920 Kbps. Higher speeds improve efficiency for configuration tasks.
Select high-speed options if you handle large configuration data regularly.
Shielding and Build
Shielding protects data signals from interference especially over longer cable runs. Tinned copper conductors and PVC jackets improve durability. Robust connectors with gold plating resist corrosion over time.
Invest in shielding for noisy industrial environments.
Warranty and Support
A strong warranty indicates manufacturer confidence. Look for at least a one-year warranty with premium brands offering up to three years. Technical support availability can save time during troubleshooting.
Check warranty terms before making a final decision.
Application Specific Needs
Different industries have unique needs such as GPS support or DB25 compatibility. Identify if your devices have special requirements like LED status indicators or COM port retention.
Choose features that match your specific hardware requirements.
How to Use and Care for Your D Sub to USB Adapter
Install the required drivers from the manufacturer's website before connecting the adapter to your computer. This ensures your operating system recognizes the device correctly as a serial port.
Once drivers are installed, plug the USB end into an available port and the DB9 end into your legacy device. Check the LED indicator if available to confirm active connection status.
Store the adapter in a dry place when not in use to prevent connector corrosion. Avoid bending the cable sharply to maintain internal wire integrity over time.
Frequently Asked Questions
Is a D Sub to USB adapter the same as a VGA adapter?
No, a D Sub to USB adapter for serial communication is not the same as a VGA adapter. These adapters transmit data signals not video signals. Always check the product description to ensure you are buying the correct type for your needs.
Do I need to install drivers for these adapters?
Many modern adapters are plug and play on Windows 10 and 11 but some models may still require manual driver installation. Always verify driver support on the product page before purchasing to ensure compatibility with your system.
Can I use this adapter with Mac computers?
Yes, many adapters support Mac OS but you may need to download specific drivers depending on your version. Check the compatibility list to ensure your Mac model is supported by the specific adapter you choose.
What is the difference between DB9 and DB25?
DB9 has nine pins while DB25 has twenty-five pins and these adapters are typically specific to one type. Ensure your device matches the connector type on the adapter to establish a proper connection.
Do these adapters support external power?
Most USB to serial adapters are bus powered meaning they draw energy from the USB port without needing an external supply. This makes them more portable but verify power requirements for high demand devices.
Why does my computer not detect the adapter?
If your computer does not detect the adapter try reinstalling the drivers or using a different USB port. Ensure the adapter is properly seated and check Device Manager to see if the COM port is assigned.
Are these adapters compatible with Linux systems?
Many models are compatible with Linux but you may need to install specific drivers manually. Look for open source support or check community forums for installation guides for your specific distribution.
What is the typical lifespan of a USB serial adapter?
A quality adapter can last several years with regular use if handled properly. Avoid frequent plugging and unplugging without loosening the connection and store it safely to maintain longevity.
Final Thoughts on Choosing the Best D Sub to USB Adapter
Our top picks cover a range of needs from the reliable FTDI models to budget-friendly options with solid performance. Each adapter brings unique strengths depending on your specific industrial or office use case.
Prioritize chipset reliability and OS support to ensure long-term usability with your legacy hardware. Consider cable length and warranty terms when making your final selection for your setup.
Remember to check current prices and availability before purchasing as these details can change frequently. Choosing the right adapter ensures your old devices stay connected to your modern workflow efficiently.