SABRENT USB 2.0 to Serial DB9 RS232 Male Adapter Cable (CB-DB9P)
4.4Editor score
Prolific PL2303GS Chipset
460800 bps Max Baud Rate
1-Year Warranty Extendable to 2
In this guide
Finding the right D Sub to USB Adapter can be challenging when connecting legacy serial devices to modern computers. A quality adapter ensures stable data transfer and broad compatibility across various operating systems and hardware configurations.
We analyzed ten top-rated adapters based on chipset reliability, cable length, compatibility, and user reviews. This list covers options ranging from budget-friendly choices to professional-grade solutions for industrial and IT applications.
Each pick highlights key features, pros, and cons to help you decide quickly. Please note that product availability and pricing may change over time, so check current listings before making your final purchase decision.
Top 3 Picks for Best D Sub to USB Adapter
USB to RS232, USB Serial Adapter with FTDI Chipset,USB 2.0 to Male DB9 Serial Cable
4.6Editor score
FTDI Chipset for Reliable Performance
1Mbps Data Transfer Rate
Plug and Play Installation
TRIPP LITE Keyspan High-Speed USB to Serial Adapter, PC & Mac, USB-A to DB9 RS232 Male, 3 Foot / 0.91 Meter Cable, 3-Year Warranty (USA-19HS)
4.6Editor score
230 Kbps Max Data Rate
LED Status Indicator
3-Year Limited Warranty
Top 10 Best D Sub to USB Adapter in 2026 Compared
This side-by-side comparison highlights the key specifications and features of all ten selected D Sub to USB adapters to help you identify the best fit for your specific connectivity needs.
ProductsSpecificationsEditor scorePrice
Editor's Choice
USB to RS232 FTDI Adapter
FTDI Chipset
1Mbps Max Rate
6ft Cable Length
Plug and Play
4.6Editor score
Editor's Choice
IOGEAR USB to PDA/Serial Adapter
USB 1.1 2.0
LED Status Light
3-Year Warranty
96 Byte Buffer
4.7Editor score
Best Budget
SABRENT USB 2.0 to Serial Adapter
Prolific PL2303GS
460800 bps
Fixed Hex Standoffs
1-Year Warranty
4.4Editor score
BENFEI USB to Serial Adapter
Prolific PL2303 Chipset
6 Feet Cable Length
Triple Shielding
18 Month Warranty
4.2Editor score
StarTech.com USB to RS232 Serial Adapter
COM Port Retention
920 kbps Max Rate
1 ft Cable Length
TAA Compliant
4.5Editor score
TRIPP LITE Keyspan High-Speed Adapter
230 Kbps Max Rate
LED Status Indicator
3 Foot Cable Length
3-Year Warranty
4.6Editor score
StarTech 17in USB to Serial Adapter
Prolific PL2303GT
17in Cable Length
512 Byte FIFO
3-Year Warranty
4.6Editor score
DTECH 10 Feet USB 2.0 to RS232 Adapter
FTDI Chipset
10ft Cable Length
LED Light Indicator
Gold Plated Connector
4.6Editor score
UGREEN 6FT DB9 Male 9 Pin USB to Serial Adapter
PL2303 Chipset
6ft Cable Length
256kbps Max Rate
Gold-plated Interfaces
4.6Editor score
StarTech 3ft 1-Port USB to Serial Cable
Prolific PL2303GC
3ft Cable Length
230.4 Kbps Max
2-Year Warranty
4.5Editor score
1. USB to RS232 FTDI Adapter – Best Overall D Sub to USB Adapter
USB to RS232 FTDI Adapter
FTDI Chipset
1Mbps Max Rate
6ft Cable Length
Plug and Play
This USB to RS232 adapter stands out for its use of the highly reliable FTDI chipset, ensuring stable connections across a wide range of legacy serial devices. With a 4.6 rating, users praise its consistent performance and ease of setup on modern systems like Windows 11 and Mac OS.
Pros
- Highly reliable FTDI chipset
- Fast 1Mbps data transfer
- Easy plug and play setup
- Wide OS compatibility
- Durable gold plated connectors
Cons
- May need driver for older OS
- Short cable for some setups
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The adapter supports data transfer rates up to 1Mbps, which is faster than many standard serial ports. Its 6ft cable provides adequate length for most desktop configurations, while the gold plated connectors enhance durability and signal integrity over time.
While it requires driver installation on some older systems like Windows XP, most modern operating systems detect it automatically. The only minor drawback is that some users might prefer a longer cable for industrial setups, but the 6ft length suits most general needs.
Ideal for IT professionals and hobbyists connecting PLCs, barcode scanners, or industrial equipment, this adapter delivers reliable performance without needing external power. Its robust build quality and chipset choice make it our top pick for most users.
Reliable FTDI Chipset Performance
The FTDI chipset ensures minimal driver conflicts and stable serial communication across diverse hardware environments.
Wide Operating System Support
Compatible with Windows versions from XP to 11, plus Mac OS and Linux systems for broad usability.
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2. IOGEAR USB to PDA/Serial Adapter – Reliable Legacy Support
IOGEAR USB to PDA/Serial Adapter
USB 1.1 2.0
LED Status Light
3-Year Warranty
96 Byte Buffer
The IOGEAR adapter is a well-regarded option for connecting serial devices to USB ports, especially those requiring driver support on both PC and Mac. Its 4.7 rating reflects strong user satisfaction with reliability and compatibility across various legacy devices like GPS units.
Pros
- Excellent 4.7 user rating
- LED light shows data activity
- Long 3-year warranty coverage
- Supports remote wakeup
- Includes PC and Mac drivers
Cons
- Older USB 1.1 compatibility
- Shorter 12 inch cable
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One standout feature is the LED status light that provides visual confirmation of data transfer activity. This helps troubleshoot connection issues quickly. The adapter also supports remote wakeup and power management, adding convenience for portable or laptop-based setups.
While the cable length is only 12 inches, which may limit flexibility in larger setups, the adapter includes both PC and Mac drivers for broad compatibility. The 3-year warranty adds peace of mind, though some users may find the shorter cable restrictive for rack-mounted equipment.
Best suited for users needing a compact solution with visual feedback, this adapter is a solid choice for those prioritizing warranty and driver support. Its high rating makes it a trustworthy option for occasional or professional use.
Visual Feedback via LED Light
The LED indicator helps users confirm active data transmission and troubleshoot connection issues instantly.
Long-Term Warranty Coverage
A 3-year limited warranty provides extended protection and support for long-term reliability.
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3. SABRENT USB 2.0 to Serial Adapter – Best Budget D Sub to USB Adapter
SABRENT USB 2.0 to Serial Adapter
Prolific PL2303GS
460800 bps
Fixed Hex Standoffs
1-Year Warranty
The SABRENT adapter offers excellent value with its affordable price and robust Prolific PL2303GS chipset. Supporting baud rates up to 460,800 bps, it handles demanding serial communication needs efficiently while maintaining compatibility with common operating systems.
Pros
- Affordable price point
- Prolific PL2303GS chipset
- High baud rate support
- Secure fixed standoffs
- Extendable warranty option
Cons
- Driver needed for some OS
- Fixed nuts limit portability
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Its fixed hex standoffs ensure a secure connection to female DB9 ports, preventing accidental disconnections during active use. The adapter is bus-powered, requiring no external power supply, and supports all 9 RS-232 signals for full functionality with PLCs and routers.
While it requires manual driver installation on some systems, Windows 11 and 10 usually detect it automatically. The only potential downside is the fixed standoffs, which may reduce portability for users frequently moving between devices in different locations.
For budget-conscious buyers needing reliable serial connectivity, this adapter delivers performance and durability at a competitive price. Its extendable warranty option adds further value for those planning long-term use in professional settings.
Secure Fixed Hex Standoffs
Fixed hex standoffs provide a stable mechanical connection to DB9 ports, reducing cable strain and disconnects.
Extendable Warranty Benefits
Register within 90 days to extend the standard 1-year warranty to 2 years for added protection.
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4. BENFEI USB to Serial Adapter – Long Cable Length
BENFEI USB to Serial Adapter
Prolific PL2303 Chipset
6 Feet Cable Length
Triple Shielding
18 Month Warranty
The BENFEI adapter is designed for users needing longer cable reach, offering a full 6 feet of flexibility for desktop or industrial setups. Its triple shielding ensures clean data transmission by minimizing electrical interference, which is crucial for reliable serial communication.
Pros
- 6-foot cable length
- Triple shielding for noise
- Prolific chipset support
- 18-month unconditional warranty
- Wide OS compatibility
Cons
- Slightly lower rating
- Driver needed for macOS
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Powered by the Prolific PL2303 chipset, it supports a wide range of operating systems including Windows 11 through XP and Mac OS X. The adapter includes an 18-month unconditional warranty, reflecting confidence in its durability and customer service responsiveness.
Some users may need to install drivers manually for macOS or older Windows versions, which could be a minor hurdle. While its 4.2 rating is solid, it reflects occasional driver-related complaints, though overall functionality remains reliable for most use cases.
Ideal for setups where device distance from the computer is a factor, this adapter combines length and shielding for stable performance. The warranty and broad compatibility make it a practical choice for home or office environments.
Enhanced Signal Integrity
Triple shielding reduces electromagnetic interference, ensuring stable data transfer over longer cable lengths.
Extended Warranty Coverage
An 18-month unconditional warranty covers defects and ensures long-term satisfaction with customer support.
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5. StarTech.com USB to RS232 Serial Adapter – Professional COM Retention
StarTech.com USB to RS232 Serial Adapter
COM Port Retention
920 kbps Max Rate
1 ft Cable Length
TAA Compliant
This StarTech.com adapter is a professional-grade solution designed for environments where consistent COM port assignment is critical. Its COM port retention ensures the adapter retains assigned serial COM port values in nonvolatile memory, simplifying reconnection after unplugging.
Pros
- COM port retention feature
- TAA compliance for contracts
- Fast 920 kbps rate
- Professional grade build
- Simple OS compatibility
Cons
- Very short 1 foot cable
- Higher price point
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With data transfer rates up to 920 kbps, it offers faster performance than many standard adapters. The TAA compliance makes it suitable for government or corporate procurement, while its 1-foot length is compact for tightly managed server rooms.
While the short cable limits flexibility, it reduces clutter in dense setups where devices are close to the computer. The 4.5 rating reflects professional satisfaction, though the higher price may be a consideration for casual or home users.
Best for IT professionals managing multiple serial devices, this adapter delivers stability and compliance. Its COM retention feature alone can save hours of configuration time in enterprise or industrial environments.
COM Port Retention Technology
Nonvolatile memory keeps COM port assignments consistent, preventing reconfiguration after each connection.
TAA Compliance
TAA compliant for procurement by government agencies and large organizations with strict sourcing requirements.
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6. TRIPP LITE Keyspan High-Speed Adapter – Best Premium D Sub to USB Adapter
TRIPP LITE Keyspan High-Speed Adapter
230 Kbps Max Rate
LED Status Indicator
3 Foot Cable Length
3-Year Warranty
The TRIPP LITE Keyspan adapter represents a premium option with robust build quality and a generous 3-year warranty. Its 4.6 rating reflects consistent performance and reliability for users needing high-speed serial connections up to 230 Kbps.
Pros
- Premium build quality
- LED activity indicator
- 3-year limited warranty
- Plug and play ease
- High-speed data transfer
Cons
- Higher cost than others
- Limited max baud rate
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A visible LED indicator provides immediate feedback on data activity and adapter status, which is helpful for troubleshooting. The 3-foot cable offers a balanced length for most setups, and the adapter requires no external power as it draws directly from the USB port.
While it may have a lower maximum baud rate compared to some competitors, its speed is sufficient for most legacy hardware. The higher price is justified by the warranty and Keyspan brand reputation for durable, reliable connectivity solutions.
Ideal for professionals requiring dependable, fast connections with visual feedback, this adapter is a top choice for those willing to invest in quality. Its longevity and support make it a smart long-term solution.
Premium Brand Reliability
TRIPP LITE Keyspan is known for durable adapters designed to withstand heavy professional use and frequent connection cycles.
Extended Warranty Protection
A 3-year limited warranty ensures long-term support and replacement coverage for peace of mind.
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7. StarTech 17in USB to Serial Adapter – Portable IT Choice
StarTech 17in USB to Serial Adapter
Prolific PL2303GT
17in Cable Length
512 Byte FIFO
3-Year Warranty
Designed specifically for IT professionals, this StarTech adapter balances portability with performance, featuring a 17-inch cable that fits easily into a carrying case. Its 4.6 rating highlights its reliability for field work and diverse connectivity needs.
Pros
- Lightweight portable design
- 512 Byte FIFO buffer
- 3-year warranty support
- Compatible with all OS
- Built for IT professionals
Cons
- Mid-length cable not ideal
- No LED indicator
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The Prolific PL2303GT chipset supports multiple parity modes and data bits for flexible serial communication. A 512-byte FIFO buffer ensures smooth data handling, while the 3-year warranty includes free lifetime technical assistance for complex setup scenarios.
While the mid-length cable may not suit extreme setups, it is convenient for portable use. The lack of an LED indicator is a minor trade-off for the adapter's lightweight design and robust technical support.
This adapter is ideal for consultants or technicians on the go who need a reliable connection without bulk. Its build quality and support options make it a strong contender for professional IT applications.
Portable Lightweight Design
The compact 17-inch cable and lightweight build make it easy to carry for on-site technical work.
Professional Support Options
Free lifetime 24/5 multilingual technical assistance helps resolve complex connectivity issues quickly.
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8. DTECH 10 Feet USB 2.0 to RS232 Adapter – Longest Cable Length
DTECH 10 Feet USB 2.0 to RS232 Adapter
FTDI Chipset
10ft Cable Length
LED Light Indicator
Gold Plated Connector
This DTECH adapter provides the longest cable length at 10 feet, making it ideal for setups where the serial device is far from the computer. Its FTDI chipset ensures reliable communication, while the LED light offers visible status confirmation during data transfers.
Pros
- Extra long 10ft cable
- Reliable FTDI chipset
- LED status indicator
- Gold plated durability
- Cross-platform support
Cons
- Tangling risks with length
- May need cable ties
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The gold plated connector enhances durability and signal quality over time. With support for Windows 11 through 7, Mac OS, and Linux, it offers broad cross-platform compatibility for diverse environments without needing additional configuration.
The 10-foot cable can present some tangling risks in cluttered areas, so cable management may be needed. Despite this, its high 4.6 rating reflects strong user satisfaction with its extended reach and stable performance in home and office use.
For users needing maximum flexibility in device placement, this adapter is unmatched. Its combination of length, chipset reliability, and LED feedback makes it a practical choice for larger workspaces.
Extended Reach Capability
The 10-foot cable allows connecting devices in distant locations without signal loss or performance degradation.
Gold Plated Connector Durability
Gold plated USB and DB9 connectors resist corrosion and ensure long-lasting reliable connections.
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9. UGREEN 6FT DB9 Male 9 Pin USB to Serial Adapter – Durable PVC Jacket
UGREEN 6FT DB9 Male 9 Pin USB to Serial Adapter
PL2303 Chipset
6ft Cable Length
256kbps Max Rate
Gold-plated Interfaces
UGREEN offers a solid adapter with a flexible PVC jacket that prevents tangling and manages cable length effectively. Its gold plated interfaces ensure durability, and the PL2303 professional chip delivers stable signal transmission up to 256kbps.
Pros
- Durable PVC jacket
- Gold plated interfaces
- Plug and play drivers
- 256kbps transfer rate
- Multiple sheilding layers
Cons
- Lower baud rate max
- Driver for macOS needed
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Most Windows users enjoy plug and play functionality on Windows 8 and above, though macOS and Linux may require driver installation. The multiple shielding layers protect data from loss and ensure reliable communication with devices like PLCs and cash registers.
While the baud rate is lower than some competitors, it suffices for standard serial communication needs. The 4.6 rating reflects user trust in its build quality and ease of use for common connectivity tasks.
Ideal for general office and home setups needing reliable performance, this adapter balances durability with affordability. Its flexible jacket and gold contacts make it a practical choice for daily use.
Flexible PVC Jacket
The PVC jacket prevents tangling and makes cable management easier in cluttered work environments.
Signal Protection Layers
Multiple shielding layers protect data integrity and prevent signal loss during active serial communication.
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10. StarTech 3ft 1-Port USB to Serial Cable – Versatile DB25 Support
StarTech 3ft 1-Port USB to Serial Cable
Prolific PL2303GC
3ft Cable Length
230.4 Kbps Max
2-Year Warranty
This StarTech adapter is uniquely versatile, supporting both DB9 and DB25 serial connections with secure screw-lock nuts for stability. Its 4.5 rating reflects reliability in professional settings such as server rooms, laboratories, and logistics environments.
Pros
- Supports DB25 and DB9
- Secure screw-lock nuts
- Prolific PL2303GC
- 2-Year warranty support
- Ideal for IT applications
Cons
- Shorter cable length
- Limited to 230.4 Kbps
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The Prolific PL2303GC chipset supports multiple parity modes and data bits for flexible configuration. With a 3-foot cable and 230.4 Kbps max rate, it is ideal for short-distance setups requiring stable, consistent data transfer.
While the cable is relatively short, the secure locking mechanism prevents accidental disconnections. The 2-year warranty and technical assistance add value for users managing critical equipment configurations regularly.
Best for IT professionals needing DB25 compatibility, this adapter delivers robust connectivity. Its locking design and support options make it a reliable tool for managing legacy hardware in controlled environments.
DB9 and DB25 Versatility
Supports both DB9 and DB25 connectors, allowing compatibility with a wider range of legacy serial devices.
Secure Screw-Lock Mechanism
Screw-lock nuts on the connector secure the cable in place, 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 type, required features, and environment. This guide walks you through the essential factors to consider before making a purchase.
Chipset Reliability
The chipset inside the adapter determines stability and driver compatibility. Popular chipsets like FTDI and Prolific PL2303 are trusted for their low error rates and broad OS support. Avoid adapters with obscure or unknown chipsets that may cause connection drops.
Look for adapters explicitly mentioning FTDI or Prolific chipsets for reliable performance.
Cable Length
Cable length affects where you can place your serial device relative to the computer. Short cables under 2 feet are fine for desk setups, while longer cables up to 10 feet are necessary for industrial equipment. Ensure the length suits your workspace without excess clutter.
Choose a length that matches your setup needs while considering cable management options.
Operating System Compatibility
Modern adapters support Windows 10/11 and Mac OS, but some may require manual driver installation for Linux or older versions. Check product descriptions for driver availability and supported systems to avoid compatibility issues.
Verify the adapter supports your specific operating system version before purchasing.
Data Transfer Rate
Higher baud rates enable faster communication between devices. While most adapters support standard rates up to 230 Kbps, some reach up to 1 Mbps for demanding applications. Select based on your device's required speed for optimal performance.
Ensure the max baud rate meets your serial device's communication needs.
Connector Type and Gender
Most adapters use male DB9 connectors, but ensure it matches your device's female port. Some support DB25 as well for broader hardware compatibility. Mismatched connectors will prevent any connection from working.
Double-check connector gender and type before buying to ensure physical compatibility.
Warranty and Support
A longer warranty indicates manufacturer confidence and provides protection against defects. Look for at least 1-year coverage, with premium options offering 3 years. Technical support is valuable for resolving driver or setup issues.
Prioritize adapters with solid warranty terms and accessible customer support.
Build Quality and Shielding
Quality connectors and shielding prevent data loss from interference. Gold plated contacts resist corrosion, while triple shielding maintains signal integrity. Durable cables last longer in frequent-use environments.
Invest in adapters with robust build materials for longevity and stability.
Plug and Play vs Driver Required
Some adapters work instantly on modern systems, while others need manual driver installation. Plug and play options simplify setup but may have limited OS support. Choose based on your technical comfort level.
Select plug and play if possible, or confirm drivers are available for your OS.
How to Use and Care for Your D Sub to USB Adapter
To start, connect the USB end to your computer and the DB9 connector to your serial device. If your system requires it, install the driver from the manufacturer's website before proceeding. Most modern systems will recognize the device automatically after connection.
Once connected, configure your communication software to use the assigned COM port with matching baud rate settings. Test the connection by sending and receiving data to ensure proper functionality. Adjust settings if errors occur or data is lost.
Care for your adapter by avoiding sharp bends in the cable and storing it in a dry place. Regularly inspect connectors for damage or debris that could affect signal quality. Proper handling extends the lifespan and ensures consistent performance.
Frequently Asked Questions
Is a D Sub to USB Adapter different from a VGA adapter?
Yes, a D Sub to USB Adapter converts USB to serial RS232 communication, not video signals. VGA adapters use DB15 connectors for display output, while serial adapters use DB9 for data. Ensure you select the correct type to avoid connection issues.
Do I need to install drivers for all operating systems?
Most adapters require drivers for Windows XP or earlier, macOS, and Linux. Windows 8 and above often work plug and play. Check the product page for specific driver requirements and download from the manufacturer if needed.
What is the maximum data transfer rate supported?
Rates vary by model, typically from 230 Kbps to 1 Mbps. Higher rates are needed for faster data exchange. Review specifications to match your device's communication speed requirements.
Can these adapters work with industrial equipment?
Yes, many models are designed for industrial PLCs, sensors, and barcode readers. Look for professional-grade adapters with COM port retention and shielding for reliable operation in demanding environments.
Are there adapters that support both DB9 and DB25?
Some adapters support both connectors, providing flexibility for different legacy devices. Check product specs to confirm compatibility with your specific serial port type.
How do I troubleshoot connection issues?
Verify driver installation and correct COM port assignment. Ensure cable connections are secure and check for physical damage. Restarting devices or testing on another computer can help isolate problems.
What warranty coverage should I expect?
Standard warranties range from 1 to 3 years depending on the brand. Premium options offer longer coverage and technical support. Review warranty details before purchase to understand your protection.
Can I use this adapter for printer connections?
Yes, serial printers with DB9 ports can connect via these adapters. Ensure your printer supports RS232 communication and configure your software for the correct serial settings.
Final Thoughts on Choosing the Best D Sub to USB Adapter
Our top picks highlight adapters that balance reliability, performance, and value for diverse needs. The FTDI-based models offer speed and stability, while options like the SABRENT provide budget-friendly solutions without sacrificing quality.
Prioritize chipset reliability and cable length based on your specific hardware requirements. A well-chosen adapter ensures seamless communication between modern computers and legacy devices without unnecessary complications.
Remember that product availability and features may change over time. Always review current listings and user feedback before making your final decision to ensure the best fit for your setup.