SABRENT USB 2.0 to Serial DB9
4.4Editor score
Affordable price point available
Fixed nuts secure connection
Windows and Linux supported
In this guide
Modern computing often requires connecting legacy serial devices to contemporary systems. A reliable D Sub to USB Adapter bridges this gap seamlessly. It ensures compatibility between old hardware and new computers without sacrificing performance or stability.
We evaluated ten leading adapters based on chipset quality, build durability, and driver support. Each product was analyzed for real-world use in industrial, medical, and office environments. Our goal is to help you choose the right connector for your specific needs.
Every selection in this guide offers unique advantages for different scenarios. Whether you need budget reliability or premium stability, we cover the spectrum. Please note that product availability and pricing may change frequently over time.
Top 3 Picks for Best D Sub to USB Adapter
USB to RS232 with FTDI Chipset
4.6Editor score
FTDI Chipset ensures reliability
Supports Windows and Mac OS
Gold plated USB connector durable
TRIPP LITE Keyspan High-Speed
4.6Editor score
Three year warranty included
High speed data transfer
LED status light provided
Top 10 Best D Sub to USB Adapter in 2026 Compared
This section provides a side-by-side comparison of all ten selected adapters. We highlight key specifications such as chipset type, cable length, and compatibility to help you make an informed decision.
ProductsSpecificationsEditor scorePrice
Editor's Choice
USB to RS232 FTDI
FTDI Chipset reliable
USB 2.0 interface
1 Mbps transfer rate
6ft cable length
4.6Editor score
Editor's Choice
IOGEAR GUC232A
LED status light present
12 inch cable length
USB 1.1 compatible
Three year warranty
4.7Editor score
Best Budget
SABRENT CB-DB9P
Prolific PL2303GS chipset
Fixed hex standoffs included
All nine signals wired
Bus powered design
4.4Editor score
BENFEI USB to Serial
Prolific PL-2303 chipset
Six foot cable length
Triple shielding provided
Eighteen month warranty
4.2Editor score
StarTech ICUSB232PRO
COM port retention feature
Nonvolatile memory storage
Industrial grade solution
One foot cable length
4.5Editor score
TRIPP LITE Keyspan
230 Kbps max speed
LED status indicator
Three foot cable length
High speed USB
4.6Editor score
StarTech ICUSB232V2
Seventeen inch length
Prolific PL2303GT chipset
512 Byte FIFO buffer
Professional support included
4.6Editor score
DTECH 10 Feet FTDI
Ten foot cable length
FT232 chip processor
LED light indicator
Gold plated connectors
4.6Editor score
UGREEN 6FT DB9
PL2303 professional chip
Six foot cable length
Gold plated connectors
PVC jacket durable
4.6Editor score
StarTech ICUSB232DB25
Three foot cable length
Screw-lock nuts included
Prolific PL2303GC chipset
DB9 or DB25 support
4.5Editor score
1. USB to RS232 FTDI – Best Overall D Sub to USB Adapter
USB to RS232 FTDI
FTDI Chipset stable
Windows and Mac compatible
1 Mbps data rate
Gold plated USB end
This adapter leads our list with its exceptional reliability and broad compatibility. It is designed for connecting legacy serial devices to modern USB ports seamlessly.
Pros
- Reliable FTDI chipset ensures stability
- Wide OS support including Linux
- High quality gold plated connectors
- Plug and play simplicity
- Durable PVC cable design
Cons
- Driver installation required for older systems
- Male DB9 connector check needed
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The FTDI chipset is a standout feature known for superior performance and driver support. It allows for fast data transfer rates up to 1 Mbps without signal loss.
While installation is simple, users on older systems may need to manually install drivers. This is a minor trade-off for the robust connection quality it provides.
It is ideal for professionals needing consistent serial communication for industrial or medical equipment. We recommend it for anyone prioritizing long-term stability.
Superior Chipset Technology
The FTDI chipset ensures that your data transfer remains stable and free from interruptions during critical tasks.
Broad Operating System Support
You can use this adapter across Windows, Mac, and Linux environments making it versatile for diverse workstations.
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2. IOGEAR GUC232A – Top Rated D Sub to USB Adapter
IOGEAR GUC232A
LED status light clear
USB 1.1 compatible
96 byte buffer size
Three year limited warranty
The IOGEAR adapter is highly rated for its reliable performance in connecting GPS devices and other serial hardware. It works efficiently with both PC and Mac systems.
Pros
- LED light monitors data transfer
- Includes PC and Mac drivers
- Strong three year warranty coverage
- Compact twelve inch cable length
- Low power consumption design
Cons
- Shorter cable length limits placement
- No support for USB 3.0 ports
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A key strength is the LED status light which gives visual feedback on data transfer activity. This helps users confirm connectivity quickly without software tools.
The limited warranty is robust but the cable is short which may restrict setup flexibility. Ensure your device is close to the USB port.
Best for users who need a compact solution for GPS or small serial peripherals. It delivers consistent performance for general office or field use.
Visual Data Monitoring
The LED light provides immediate visual confirmation of data flow making it easier to troubleshoot connection issues.
Warranty and Reliability
A three year limited warranty shows the manufacturer's confidence in the product's durability and performance over time.
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3. SABRENT CB-DB9P – Best Value D Sub to USB Adapter
SABRENT CB-DB9P
Prolific PL2303GS chipset
Fixed hex standoffs strong
Nine signals fully wired
Bus powered USB design
This SABRENT adapter offers the best balance of cost and performance in our lineup. It is perfect for users needing reliable serial connectivity on a budget.
Pros
- Affordable price without major compromises
- Fixed nuts secure connection firmly
- Supports Windows and Linux OS
- All nine serial signals wired
- Electrical tested units
Cons
- May require manual driver install
- Basic cable construction materials
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It features a Prolific chipset that ensures stable communication with various devices. The fixed hex standoffs provide a secure physical connection to your equipment.
While the build is simple it meets essential standards for most applications. Users should check their system drivers to ensure smooth setup.
Ideal for budget-conscious buyers or those with multiple devices needing adapters. It provides reliable serial access without breaking the bank.
Secure Physical Connection
The fixed hex standoffs prevent accidental disconnection which is vital for stable operation in industrial settings.
Cost Effective Solution
Buying this adapter saves money while still delivering the necessary functionality for standard serial communication tasks.
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4. BENFEI USB to Serial – Best Long D Sub to USB Adapter
BENFEI USB to Serial
Prolific PL2303 chipset
Six foot cable length
Triple shielding protection
Eighteen month warranty
BENFEI provides a practical solution with a longer cable for flexible workstation setups. It connects standard serial devices to modern computers with ease.
Pros
- Six foot cable offers flexibility
- Triple shielding reduces interference
- Wide OS compatibility support
- Unconditional eighteen month warranty
- Friendly customer service
Cons
- Slightly lower rating than top models
- Driver install needed on older OS
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The triple shielding is a significant benefit that ensures data integrity in environments with electrical noise. This helps maintain stable transmission rates.
Performance is good but user feedback suggests occasional driver updates. However the warranty support is responsive and helpful for resolving issues.
Great for users who need extra cable reach for their setups. It balances affordability with the durability needed for regular use.
Interference Protection
Triple shielding ensures that your data remains clean and free from external electrical interference during transmission.
Extended Reach
The six foot length allows you to position your devices further away from the computer without signal degradation.
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5. StarTech ICUSB232PRO – Best Industrial D Sub to USB Adapter
StarTech ICUSB232PRO
COM port retention feature
Nonvolatile memory storage
Industrial grade solution
One foot cable length
This StarTech adapter is built for professional environments where port stability is critical. It automatically assigns the same COM port even after disconnecting.
Pros
- Retains COM port values automatically
- Professional grade reliability
- Broad OS compatibility
- Ideal for industrial equipment
- Durable TAA compliance
Cons
- Short cable limits distance
- Higher price than basic models
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The retention feature is unique and prevents software configuration issues in complex setups. It simplifies management for IT administrators significantly.
The price is higher reflecting its professional build quality. The short cable is a drawback if you need more reach.
Best for industrial control or medical equipment where consistent port mapping is essential. It is a premium tool for specific professional needs.
Port Value Retention
Storing COM port values in nonvolatile memory avoids the need for reconfiguration every time the device is reconnected.
Professional Reliability
Designed for IT professionals this adapter delivers the stability required for mission critical industrial applications.
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6. TRIPP LITE Keyspan – Premium D Sub to USB Adapter
TRIPP LITE Keyspan
230 Kbps max speed
LED status indicator
Three foot cable length
High speed USB
TRIPP LITE Keyspan delivers high performance with a focus on durability and support. It is a robust choice for users needing reliable serial connectivity.
Pros
- High speed data transfer rate
- Three year warranty coverage
- LED status light useful
- Compatible with PC and Mac
- Solid build quality
Cons
- Premium price point
- Not the longest cable option
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The adapter supports high speeds which improves efficiency for data intensive tasks. An LED indicator provides clear feedback on connection status.
Cost is higher than average but the warranty and build quality justify it. It is an investment in long term connectivity stability.
Perfect for professionals who need guaranteed performance and support. It is one of the most reliable options available.
High-Speed Data Transmission
Supporting up to 230 Kbps this adapter ensures faster communication for devices that demand higher throughput speeds.
Comprehensive Support Warranty
A three year warranty demonstrates strong product confidence and offers peace of mind for long term usage.
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7. StarTech ICUSB232V2 – Best Compact D Sub to USB Adapter
StarTech ICUSB232V2
Seventeen inch cable length
Prolific PL2303GT chipset
512 Byte FIFO buffer
Professional support included
This StarTech adapter is ideal for IT professionals on the go. Its compact design makes it easy to carry in a laptop bag.
Pros
- Compact portable design
- Professional grade support
- High FIFO buffer size
- Wide parity support modes
- Three year warranty
Cons
- Fixed 17 inch length
- Higher price for basic features
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It features a large FIFO buffer which helps manage data flow efficiently. The chipset supports a wide range of parity and data bit settings.
While the cable is short it is sufficient for nearby ports. The warranty includes technical assistance which is a major benefit.
Best for field technicians who need a reliable tool for various devices. It combines portability with professional features.
Portable Design
Its lightweight and compact size makes it easy to transport to different work sites or server rooms.
Technical Assistance
Free lifetime technical assistance provides valuable support when troubleshooting complex connection issues.
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8. DTECH 10 Feet FTDI – Longest D Sub to USB Adapter
DTECH 10 Feet FTDI
Ten foot cable length
FT232 chip processor
LED light indicator
Gold plated connectors
DTECH stands out for its impressive ten foot cable which allows great flexibility in device placement. It uses a reliable FTDI chipset for stable performance.
Pros
- Ten foot cable offers reach
- Reliable FTDI chipset
- LED light for status
- Supports wide OS range
- Gold plated USB end
Cons
- Takes up more storage space
- Price higher than average
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The gold plated connectors ensure durability and good contact quality. This is useful for frequent plugging and unplugging in dynamic environments.
While the cable is long it can be bulky for travel. Consider your workspace needs before deciding on this length.
Excellent for setups where the computer is far from the serial device. It bridges distance without sacrificing connection quality.
Extended Reach
The ten foot cable allows you to place devices further away from the computer reducing cable clutter in workspaces.
Quality Construction
Gold plated connectors resist corrosion and ensure a solid connection over years of regular use.
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9. UGREEN 6FT DB9 – Best All-Rounder D Sub to USB Adapter
UGREEN 6FT DB9
PL2303 professional chip
Six foot cable length
Gold plated connectors
PVC jacket durable
UGREEN provides a versatile adapter that works well across most modern systems. It features a solid build with gold plated connectors for longevity.
Pros
- Six foot cable good length
- Gold plated connectors durable
- Driver free on Win 8+
- Multiple shielding layers stable
- Universal OS compatibility
Cons
- Drivers needed for older OS
- Cable management required
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The six foot cable is a good middle ground for most setups. Multiple shielding layers help prevent signal loss in noisy environments.
It works seamlessly on Windows 8 and above without extra drivers. Older systems may need manual installation which is standard for this category.
A great all-rounder for office and home use. It balances price performance and convenience effectively.
Driver Free Operation
Modern Windows systems detect this adapter automatically simplifying the setup process for many users.
Durable Build Quality
Gold plated connectors and PVC jacket protect the cable from wear and ensure reliable connections.
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10. StarTech ICUSB232DB25 – Best Professional D Sub to USB Adapter
StarTech ICUSB232DB25
Three foot cable length
Screw-lock nuts included
Prolific PL2303GC chipset
DB9 or DB25 support
This StarTech adapter is ideal for users needing DB25 compatibility alongside standard DB9. It offers professional features for industrial environments.
Pros
- Supports DB9 and DB25 devices
- Screw-lock nuts secure connection
- Strong technical assistance
- Professional grade reliability
- Two year warranty
Cons
- Short cable length
- Limited availability in some regions
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The screw-lock nuts ensure the connection stays tight during use. This is critical for devices that vibrate or move.
While the cable is short it is sufficient for most stationary setups. The support provided is a major advantage for businesses.
Perfect for IT professionals managing legacy systems. It provides robust connectivity for specialized industrial hardware.
DB25 Compatibility
Supporting both DB9 and DB25 interfaces makes this adapter versatile for various legacy hardware devices.
Secure Connection
Screw-lock nuts prevent accidental unplugging ensuring consistent data flow during critical operations.
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Buying Guide – How to Choose the Best D Sub to USB Adapter
Selecting the right adapter requires considering several factors to ensure compatibility and performance.
Chipset Quality
The chipset is the brain of the adapter and determines stability. FTDI chipsets are known for the best performance and driver support while Prolific offers a budget friendly option.
Always choose an adapter with a reputable chipset to avoid connection drops and driver issues.
Cable Length
Cable length affects how you can position your device. Long cables offer flexibility but can create clutter while short ones are portable but limiting.
Measure the distance between your USB port and device to select the right length.
Operating System Support
Different adapters support different operating systems. Many work seamlessly on modern Windows versions but Linux and Mac users should check driver availability.
Ensure the adapter includes drivers for your specific OS version before purchasing.
Connector Type
You need to confirm the gender of your serial port. Most adapters are male to female but some devices require a reverse connection.
Check your device documentation to avoid buying the wrong connector gender.
Data Transfer Rate
Higher baud rates allow faster data transmission which is useful for large files or real time monitoring.
Look for adapters supporting speeds of 1Mbps or higher if you need fast performance.
Durability and Build
Industrial environments require adapters that can withstand dust and vibration. Metal connectors and shielded cables help protect against interference.
Choose models with sturdy connectors if you plan to use the adapter daily.
Warranty Coverage
A warranty protects your investment against defects. Top brands often offer two to three years of coverage.
Prioritize models with a solid warranty policy for peace of mind.
Driver Installation
Most modern adapters are plug and play but some may require manual driver downloads.
Check if drivers are available for your system to avoid setup delays.
How to Use and Care for Your D Sub to USB Adapter
To use your adapter connect the USB end to your computer and the DB9 end to your serial device. Wait for your operating system to detect the hardware and assign a COM port.
Ensure you install any necessary drivers before using specialized software. You can usually find drivers on the manufacturer website or included on a CD.
Care for your adapter by avoiding sharp bends in the cable and keeping connectors clean. Store it in a dry place when not in use to prevent damage.
Frequently Asked Questions
Is a D Sub to USB Adapter different from a VGA adapter?
Yes. A D Sub to USB Adapter is used for serial data communication with devices like PLCs or modems. A VGA adapter is used for video output. They are not interchangeable so ensure you choose the correct type.
Do I need to install drivers for my adapter?
Most modern Windows systems detect adapters automatically. However Linux or older Windows versions may require manual driver installation. Check the product specs to confirm OS support.
What is the typical data transfer rate?
Most adapters support speeds between 115 kbps and 1 Mbps. This is sufficient for most industrial and office applications but fast data transfers may vary by device.
Can I use this adapter with Linux?
Many adapters support Linux but you may need to download specific drivers. Check the manufacturer documentation to ensure compatibility with your distribution.
What if the adapter is not recognized?
Ensure the cable is fully plugged in and try a different USB port. If issues persist reinstall the driver or check the device manager for conflicts.
Are these adapters compatible with Mac?
Yes many models support macOS but you need to check driver availability. Newer versions usually support plug and play while older ones need drivers.
Final Thoughts on Choosing the Best D Sub to USB Adapter
Our top picks offer reliable solutions for connecting legacy serial devices to modern computers. The FTDI models stand out for stability while budget options provide value for casual use.
Prioritize chipset quality and cable length to match your specific setup needs. A reliable adapter ensures consistent communication without unexpected interruptions.
Always verify current product availability and pricing before purchasing. Prices and stock levels may change frequently on online platforms.