SABRENT USB 2.0 to Serial DB9
4.4Editor score
Affordable price point
Prolific chipset support
Compact portable 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 RS232 ports and current USB interfaces ensuring reliable data transfer.
We evaluated ten top-rated adapters based on chipset quality compatibility and build durability. Our comparison covers various cable lengths and supported operating systems to meet diverse professional needs.
Each pick highlights key features and potential trade-offs for informed decisions. Please note that pricing fluctuates frequently so verify current costs before purchasing to ensure the best value today.
Top 3 Picks for Best D Sub to USB Adapter
USB to RS232 with FTDI Chipset
4.6Editor score
High quality chipset
Six feet cable length
Universal OS support
TRIPP LITE Keyspan High-Speed
4.6Editor score
Premium build quality
Extended warranty coverage
Enhanced signal speed
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 highlighting their unique specifications and capabilities for various use cases.
ProductsSpecificationsEditor scorePrice
Editor's Choice
USB to RS232 FTDI
6ft cable length
FTDI chipset
1Mbps transfer rate
Windows and Mac
4.6Editor score
Editor's Choice
IOGEAR USB to PDA
12 inch cable
LED status light
Remote wakeup
Three year warranty
4.7Editor score
Best Budget
SABRENT USB 2.0
Fixed nut design
Prolific chipset
All nine signals
One year warranty
4.4Editor score
BENFEI USB to Serial
6ft cable length
Prolific chipset
Triple shielding
Eighteen month warranty
4.2Editor score
StarTech COM Retention
One foot cable
COM port retention
920kbps speed
Industrial grade use
4.5Editor score
TRIPP LITE Keyspan
Three foot cable
High speed data
LED indicator
Three year warranty
4.6Editor score
StarTech 17in USB
17 inch cable
921.6kbps max
Prolific chipset
3 year support
4.6Editor score
DTECH 10 Feet USB
10ft cable length
FTDI chipset
Gold plated connector
Universal OS support
4.6Editor score
UGREEN 6FT DB9
6ft cable length
Gold plated connector
256kbps transfer
Driver free win8
4.6Editor score
StarTech 3ft USB
3ft cable length
230.4kbps max
Prolific chipset
Two year warranty
4.5Editor score
1. USB to RS232 FTDI – Best Overall D Sub to USB Adapter
USB to RS232 FTDI
Six feet length
FTDI chipset
1Mbps speed
Universal OS
This adapter stands out as a top choice for users needing reliable serial connectivity. It features a high quality FTDI chipset ensuring stable data transfer across various devices.
Pros
- High reliability chipset
- Flexible cable length
- Wide OS support
Cons
- Driver installation needed
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The six feet cable provides ample reach for connecting devices located further away from your computer. Its compatibility with Windows Mac and Linux makes it a versatile tool for diverse environments.
While it requires initial driver installation for some systems the process is straightforward and ensures optimal performance. Users should verify port gender before purchase to avoid confusion.
Ideal for professionals needing consistent serial connections this adapter delivers strong performance. It is a solid recommendation for anyone bridging old hardware with modern USB systems.
Reliable Chipset Performance
The FTDI chipset ensures consistent and error free data transmission for critical applications.
Flexible Connectivity
The six feet cable length allows for convenient placement of legacy devices away from the computer.
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2. IOGEAR USB to PDA – Best Premium D Sub to USB Adapter
IOGEAR USB to PDA
12 inch cable
LED status
Remote wakeup
3 year warranty
IOGEAR offers a premium solution known for robust construction and reliable performance. This adapter includes features like LED status monitoring for enhanced user awareness.
Pros
- Strong build quality
- LED data indicator
- Excellent warranty
Cons
- Short cable length
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Its support for remote wakeup and power management adds convenience for energy efficient setups. The three year warranty reflects confidence in its long term durability and quality.
The twelve inch cable limits placement options compared to longer models which may be a drawback for some setups. However the compact size is ideal for portable or desktop confined use.
Best for users prioritizing quality and warranty coverage this adapter delivers consistent results. It is a premium choice for those willing to pay slightly more for reliability.
Enhanced Monitoring
The LED status light provides immediate visual feedback on data transfer activity.
Long Term Value
A three year limited warranty ensures peace of mind for extended usage periods.
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3. SABRENT USB 2.0 – Best Budget D Sub to USB Adapter
SABRENT USB 2.0
Fixed nuts
Prolific chipset
All signals
1 year warranty
SABRENT provides an affordable option that delivers essential functionality without compromising on core features. It supports all nine signals needed for standard RS232 communication.
Pros
- Low cost
- Compact design
- Full signal support
Cons
- Short warranty
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The fixed nuts on the DB9 connector ensure secure connections preventing accidental disconnections during use. Its compact design makes it easy to carry in toolkits or bags.
While the one year warranty is shorter than some competitors the low price point offers great value for budget conscious buyers. Drivers are available for major operating systems including Linux.
This adapter is perfect for users needing a quick reliable connection on a budget. It is a practical choice for occasional use or projects where cost is a primary factor.
Secure Connection
Fixed hex standoffs on the DB9 connector provide a stable and secure mating interface.
Full Signal Support
All nine pins are wired ensuring complete compatibility with standard RS232 devices.
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4. BENFEI USB to Serial – High Value D Sub to USB Adapter
BENFEI USB to Serial
6ft cable
Prolific chipset
Triple shielding
18 month warranty
BENFEI offers a balanced adapter with a six feet cable and solid shielding for reliable data transfer. The Prolific chipset provides broad compatibility with many serial devices.
Pros
- Good length
- Shielded cable
- Long warranty
Cons
- Lower rating
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Triple shielding helps protect against interference ensuring stable performance in electrically noisy environments. An eighteen month warranty adds value and reflects confidence in build quality.
While user ratings are slightly lower it still performs well for most standard serial applications. The clear labeling that it is not a VGA adapter prevents common buyer confusion.
This model is a strong contender for users seeking a middle ground between cost and features. It is suitable for general purpose connectivity needs in office or home setups.
Noise Protection
Triple shielding minimizes signal interference for cleaner data transmission.
Clear Labeling
Explicit warnings prevent confusion with video adapters ensuring correct product selection.
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5. StarTech COM Retention – Industrial Grade D Sub to USB Adapter
StarTech COM Retention
1ft cable
COM retention
920kbps
Industrial grade
This StarTech adapter is designed for professional environments where consistent port assignment is critical. It retains COM port values in nonvolatile memory simplifying configuration for frequent users.
Pros
- COM retention
- Industrial design
- TAA compliant
Cons
- Short cable
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The industrial grade build ensures durability under heavy use conditions typical in server rooms or labs. TAA compliance makes it suitable for government procurement and regulated sectors.
One foot cable limits flexibility but ensures a compact footprint near the host computer. The high baud rate supports faster data transfer for demanding serial applications.
Ideal for IT professionals needing reliable infrastructure this adapter delivers targeted functionality. It is a premium tool for specialized use cases requiring strict port management.
Port Management
Nonvolatile memory retains COM port assignments preventing reconfiguration after unplugging.
Government Procurement
TAA compliance meets requirements for US government and public sector purchases.
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6. TRIPP LITE Keyspan – High Speed D Sub to USB Adapter
TRIPP LITE Keyspan
3ft cable
High speed
LED status
3 year warranty
TRIPP LITE Keyspan delivers high speed data transfer rates that exceed standard serial limits. This ensures efficient communication for applications requiring faster throughput.
Pros
- Fast data rates
- Strong warranty
- LED indicator
Cons
- Higher cost
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A three year warranty and LED status indicator enhance user confidence and monitoring capabilities. The build quality is robust suitable for daily professional use in various environments.
The higher price point reflects its premium positioning but may be justified for critical operations. Three feet cable length offers a reasonable balance between reach and manageability.
Recommended for users prioritizing speed and reliability this adapter performs consistently well. It is a solid investment for businesses needing dependable connectivity for network equipment.
Enhanced Throughput
High speed data rates improve efficiency for applications requiring faster serial communication.
Visual Feedback
LED activity light provides instant status updates on connection health and data flow.
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7. StarTech 17in USB – Portable D Sub to USB Adapter
StarTech 17in USB
17 inch cable
921.6kbps
512 byte FIFO
Prolific chipset
Designed for professionals on the go this lightweight adapter fits easily into carrying cases. Its portable form factor makes it ideal for field technicians and mobile setups.
Pros
- Portable design
- High baud rate
- Strong support
Cons
- Moderate length
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Supporting baud rates up to 921.6 Kbps it ensures fast communication with compatible devices. A 512 byte FIFO buffer aids smooth data handling reducing potential transmission delays.
The sixteen month cable provides adequate reach for most desk setups but may limit mobility. It is backed by comprehensive technical support and a three year warranty.
Best for mobile professionals this adapter combines performance with convenience. It is a practical choice for maintaining connectivity during travel or onsite visits.
Mobility Optimized
Lightweight design ensures easy transport in standard laptop or tool bags.
Buffer Support
512 byte FIFO buffer manages data flow to prevent packet loss.
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8. DTECH 10 Feet USB – Long Cable D Sub to USB Adapter
DTECH 10 Feet USB
10ft cable
FTDI chipset
Gold plated
Universal support
This adapter features a ten feet cable offering exceptional reach for remote devices. It is powered by a high performance FTDI chipset ensuring reliable serial communication.
Pros
- Very long cable
- Quality chipset
- Gold connectors
Cons
- Bulkier cable
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Gold plated connectors enhance durability and prevent corrosion over time for long term use. The flexible PVC jacket manages cable length effectively preventing tangling during storage.
The longer cable can be slightly bulkier than standard six feet models requiring careful routing. Its universal OS support covers most operating systems including modern Windows versions.
Ideal for setups where devices are far from the computer this adapter provides necessary flexibility. It is a recommended solution for industrial environments requiring extended cable lengths.
Extended Reach
Ten feet cable length connects devices located far from the host USB port.
Durability
Gold plated connectors resist corrosion and ensure stable electrical contact over time.
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9. UGREEN 6FT DB9 – Universal D Sub to USB Adapter
UGREEN 6FT DB9
6ft cable
Gold plated
256kbps
Driver free win8
UGREEN offers a versatile adapter with broad compatibility across various operating systems. It supports driver free use on Windows 8 and above simplifying setup for most users.
Pros
- Driver free win8
- Gold plated
- Solid warranty
Cons
- Slower speed
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The gold plated interfaces enhance durability and corrosion resistance ensuring reliable connections. A flexible PVC jacket prevents tangling making management easier for everyday use.
While transfer rates are lower at 256kbps it remains sufficient for many standard serial tasks. The brand reputation and warranty coverage add confidence for general users.
Best for general connectivity needs this adapter provides reliable performance at a reasonable cost. It is a solid choice for home users and small businesses.
Easy Setup
Driver free support on Windows 8 reduces installation steps for immediate use.
Tangle Free
Flexible PVC jacket ensures the cable stays organized during storage.
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10. StarTech 3ft USB – Reliable D Sub to USB Adapter
StarTech 3ft USB
3ft cable
230.4kbps
512 byte FIFO
Prolific chipset
StarTech provides a reliable solution backed by professional support and a two year warranty. The secure screw-lock nuts on the connector ensure a stable connection for critical tasks.
Pros
- Reliable brand
- Secure screw nuts
- Good warranty
Cons
- Slower speed
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Supporting up to 230.4 Kbps it covers standard serial communication needs effectively. The 512 byte FIFO buffer helps manage data flow for smoother performance.
Three feet cable length offers a compact profile suitable for desktop setups near the computer. Its compatibility with Windows Mac and Linux ensures broad usability.
This adapter is well suited for IT applications in server rooms and labs. It is a dependable choice for users prioritizing stability and manufacturer support.
Secure Locking
Screw-lock nuts on the connector prevent accidental disconnections during use.
Professional Support
Two year warranty and multilingual technical assistance ensure long term reliability.
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Buying Guide – How to Choose the Best D Sub to USB Adapter
Selecting the right adapter requires evaluating chipset compatibility cable length and operating system support to ensure reliable serial connectivity.
Chipset Quality
The chipset determines reliability and driver compatibility. Options like FTDI and Prolific are industry standards known for stable performance across various systems. Avoid cheap uncertified chipsets that may cause connection drops.
Look for adapters clearly stating the chipset type to ensure compatibility and support.
Cable Length
Cable lengths range from one foot to ten feet. Longer cables offer flexibility for devices far from the computer but may be bulkier to manage. Shorter cables are ideal for compact desktop setups.
Choose a length that fits your workspace layout without requiring excessive extension.
Operating System Support
Most adapters support Windows but verify compatibility with macOS or Linux if needed. Some models offer driver free installation for newer Windows versions while others require manual driver downloads.
Check the product details for supported OS versions before purchasing.
Build Quality
Gold plated connectors and shielding enhance durability and signal integrity. PVC jackets prevent tangling and protect internal wires from wear. Robust construction ensures longevity in professional environments.
Prioritize models with premium materials for frequent or industrial use.
Port Security
Fixed standoffs or screw-lock nuts prevent accidental disconnection. This feature is crucial for devices that need constant connectivity without interruptions. Mates securely with female DB9 ports for stability.
Ensure the adapter has locking mechanisms to secure the connection firmly.
Warranty Coverage
Warranties range from one to three years. Longer coverage reflects manufacturer confidence and provides protection against defects. Consider warranty terms when comparing similar priced models.
Select an adapter with a warranty that matches your usage needs.
Data Transfer Speed
Most adapters support baud rates up to 921kbps or higher. Ensure the speed meets your device requirements for effective communication. Faster rates reduce latency for real time applications.
Verify max baud rate specifications to match your device capabilities.
LED Indicators
LED lights provide visual status feedback on data activity. This helps users confirm connection health without needing software tools. A clear status indicator simplifies troubleshooting.
Consider models with status lights for easier monitoring.
How to Use and Care for Your D Sub to USB Adapter
Connect the USB end to an available port on your computer and the DB9 end to your serial device. Install any required drivers if not automatically detected by your operating system.
Ensure the connection is secure by tightening standoffs or screws if available. This prevents accidental disconnects and maintains stable data transmission during operation.
Store the adapter in a cool dry place to protect the jacket and connectors. Avoid excessive bending of the cable to prevent internal wire damage.
Frequently Asked Questions
What is a D Sub to USB Adapter used for?
This adapter connects legacy devices with RS232 serial ports to modern computers using USB interfaces. It enables communication with older industrial equipment or hardware without native USB support.
Do I need to install drivers for these adapters?
Some adapters like those with FTDI chips may require manual driver downloads while others work plug and play on Windows 8 and above. Check the product specifications for specific driver requirements.
Will this adapter work for video signals like VGA?
No these adapters are designed for serial data communication only not video signals. Using them for video connections will not work and may cause damage to the ports.
Are these adapters compatible with Linux?
Most modern adapters support Linux but driver installation may be required depending on the chipset. Verify Linux support specifically on the product page before purchasing for compatibility.
What is the difference between DB9 and DB25 adapters?
DB9 adapters have nine pins while DB25 have twenty five. Ensure you match the adapter to your device port gender and pin count to ensure a proper connection.
How do I check my serial port gender?
A male port has protruding pins while a female port has holes. Check your device port before ordering to ensure the adapter matches the correct gender.
Can I use this adapter for network printers?
Yes many older printers with serial ports can connect via these adapters for printing tasks. Ensure your computer has the correct drivers and COM port settings configured.
What happens if I use a non-standard adapter?
Non-standard adapters may have incompatible chipsets leading to connection failures or damage. Stick to reputable brands and certified chipsets like FTDI for reliable performance.
Final Thoughts on Choosing the Best D Sub to USB Adapter
Choosing the right adapter depends on your specific needs for cable length chipset reliability and operating system support. Top picks like the FTDI and StarTech models offer robust solutions for varied environments.
Prioritize adapters with secure connections and strong warranties to ensure long term reliability. Consider your budget and whether you need features like LED status indicators or extra reach.
Always verify compatibility with your devices before purchasing to avoid return hassles. Check current prices as costs may fluctuate based on demand and availability.