SABRENT USB 2.0 to Serial DB9
4.4Editor score
Prolific Chipset included
Fixed nuts on DB9
All 9 signals supported
In this guide
Connecting modern computers to legacy serial devices often requires a reliable D Sub to USB adapter. These tools bridge the gap between older hardware and current operating systems.
We evaluated ten highly rated adapters based on chipset quality, build durability, and driver compatibility. Our analysis ensures you find a solution that works seamlessly with your setup.
Each pick highlights specific strengths like cable length or chipset reliability. Remember that availability and pricing can change over time on major retail platforms.
Top 3 Picks for Best D Sub to USB Adapter
USB to RS232 with FTDI Chipset
4.6Editor score
FTDI Chipset for reliability
Gold Plated connectors
Wide OS Compatibility
TRIPP LITE Keyspan High-Speed USB
4.6Editor score
230 Kbps transfer rate
LED status indicator
3-Year warranty coverage
Top 10 Best D Sub to USB Adapter in 2026 Compared
The following table provides a side-by-side comparison of the top ten adapters we reviewed. Look closely at the chipset and cable length to match your specific industrial or office needs.
ProductsSpecificationsEditor scorePrice
Editor's Choice
USB to RS232 with FTDI Chipset
FTDI Chipset
6ft Cable Length
USB 2.0
1Mbps Data Rate
4.6Editor score
Editor's Choice
IOGEAR USB to PDA/Serial Adapter
USB 1.1 and 2.0
12 in Cable Length
LED status light
Remote wakeup support
4.7Editor score
Best Budget
SABRENT USB 2.0 to Serial DB9
Prolific PL2303GS Chipset
Fixed Nuts on DB9
All 9 Signals
Bus Powered
4.4Editor score
BENFEI USB to Serial Adapter
Prolific Chipset
6 Feet Cable Length
Tinned Copper Conductor
Triple Shielding
4.2Editor score
StarTech.com USB to RS232 Adapter
COM Port Retention
Up to 920 kpbs
Professional Grade Solution
1 ft Cable Length
4.5Editor score
TRIPP LITE Keyspan High-Speed USB
Up to 230 Kbps
LED Adapter Status
No External Power
3 Foot Cable Length
4.6Editor score
StarTech 17in USB to Serial Adapter
Prolific PL2303GT Chipset
512 Byte FIFO
Max Baud 921.6 Kbps
17in Cable Length
4.6Editor score
DTECH 10 Feet USB 2.0 Adapter
FTDI Chipset
10ft Cable Length
LED Light Included
Gold Plated Connector
4.6Editor score
UGREEN 6FT DB9 Male USB Adapter
Prolific PL2303 Chipset
6ft Cable Length
Gold Plated Connectors
Flexible PVC Jacket
4.6Editor score
StarTech 3ft USB to Serial Cable
Prolific PL2303GC Chipset
512 Byte FIFO
Max Baud 230.4 Kbps
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 Included
6ft Cable Length
Gold Plated Connectors
Supports Most OS
This adapter is widely recognized for its stability thanks to the included FTDI chipset. It supports a vast range of operating systems including Windows 11 and Linux.
Pros
- Highly reliable chipset
- Durable cable construction
- Works with many OS
- Gold plated durability
- Wide application support
Cons
- Not a video adapter
- Requires driver download
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The 6ft cable length offers excellent flexibility for reaching equipment placed far from the computer. Gold plated connectors ensure a consistent connection over years of use.
It is critical to note this is a serial adapter not a video converter. Users must install drivers before use which can be a minor inconvenience for some.
Ideal for industrial technicians and office workers needing reliable legacy hardware access. Its robust build makes it a top recommendation for daily tasks.
Reliable Chipset Performance
The FTDI chipset ensures data integrity during transfers reducing errors often seen with generic alternatives.
Versatile Operating System Support
Compatibility spans from Windows XP to Windows 11 ensuring it works in almost any environment.
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2. IOGEAR USB to PDA/Serial Adapter – Excellent Legacy Device Support
IOGEAR USB to PDA/Serial Adapter
USB 1.1 and 2.0
LED Status Light
12 In Cable Length
Remote Wakeup Support
IOGEAR provides a solid solution for connecting older serial peripherals like GPS units to modern laptops. The LED light helps users monitor data activity easily.
Pros
- Clear LED status light
- Long limited warranty
- Supports remote wakeup
- Compact design
- Works with GPS devices
Cons
- Short cable length
- Older USB standard
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While the cable is shorter than some competitors the 3 year warranty offers significant peace of mind for professional users who rely on consistent connectivity.
The limitation lies in the shorter cable which might not reach distant machinery in large warehouses. It is also limited to USB 1.1/2.0 standards.
Best suited for users needing a compact reliable adapter for portable devices. It balances build quality with essential features effectively.
Visual Data Monitoring
The LED status light allows you to see when data is actively transferring without opening software.
Robust Warranty Coverage
A three year limited warranty protects your investment against defects and premature failure.
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3. SABRENT USB 2.0 to Serial DB9 – Best Budget D Sub to USB Adapter
SABRENT USB 2.0 to Serial DB9
Prolific PL2303GS Chipset
Fixed Nuts on DB9
All 9 Signals
Bus Powered
This option delivers strong performance at a very competitive price making it accessible for occasional users. The fixed nuts on the DB9 connector prevent unwanted rotation during use.
Pros
- Affordable price point
- Fixed nuts prevent spinning
- Full 9 signal support
- No external power needed
- High baud rate support
Cons
- Generic chipset issues
- Driver installation required
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It supports all nine serial signals allowing for full duplex communication which is essential for certain industrial controllers. The Prolific chipset handles high baud rates efficiently.
Some users may face driver conflicts depending on their specific OS version which adds a step to setup. However performance is solid once configured correctly.
Perfect for hobbyists and small businesses needing a cost effective serial connection. It offers great value without sacrificing core functionality.
Secure Connector Design
Fixed hex standoffs on the connector ensure the cable stays securely attached to your device.
Full Signal Connectivity
All nine signals are wired properly supporting complex serial devices that need handshaking.
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4. BENFEI USB to Serial Adapter – Durable Shielding Design
BENFEI USB to Serial Adapter
Prolific Chipset
6 Feet Cable Length
Tinned Copper Conductor
Triple Shielding
BENFEI focuses on signal integrity with triple shielding and tinned copper conductors. This design choice reduces interference which is vital in electrically noisy environments.
Pros
- Triple shielding for signal
- Tinned copper conductor
- 18 month warranty
- Good cable length
- Strong plug and play
Cons
- Lower rating average
- Chipset compatibility
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The 6ft cable offers a good balance between reach and manageability. Users can connect devices placed further away without needing an extender.
While the rating is slightly lower the build quality is robust for the price. The 18 month warranty shows the manufacturer confidence in the product.
Recommended for users working in industrial settings with high interference. The shielding provides a stable link for sensitive serial equipment.
Signal Protection Features
Triple shielding layers protect data lines from electromagnetic interference common in factories.
Material Durability
Tinned copper conductors prevent corrosion and ensure long term electrical conductivity.
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5. StarTech.com USB to RS232 Adapter – Professional Grade Solution
StarTech.com USB to RS232 Adapter
COM Port Retention
Up to 920 kpbs
Professional Grade Solution
1 ft Cable Length
StarTech offers a professional grade solution ideal for IT environments where consistency is key. The COM port retention feature ensures devices recognize the adapter instantly even after replugging.
Pros
- COM port retention feature
- High data transfer speed
- TAA compliant
- Professional grade build
- Broad OS compatibility
Cons
- Short cable length
- Higher price point
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With speeds up to 920 kbps this adapter handles high throughput data streams effectively. It is TAA compliant for government and secure contracting needs.
The short cable may limit placement options and the price is higher than consumer grade options. However the reliability justifies the cost for critical systems.
Best for network admins managing servers or industrial machines. The retention feature saves significant time on troubleshooting connection issues.
Persistent COM Port ID
Retained memory ensures the COM port number stays consistent which is crucial for software scripts.
High Speed Capability
Transferring data at 920 kbps makes it suitable for faster serial devices than standard ports.
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6. TRIPP LITE Keyspan High-Speed USB – Best Premium D Sub to USB Adapter
TRIPP LITE Keyspan High-Speed USB
Up to 230 Kbps
LED Adapter Status
No External Power
3 Foot Cable Length
This premium adapter from Keyspan delivers high speed performance with speeds up to 230 Kbps. The LED status indicator provides immediate visual feedback on connection health.
Pros
- High speed data transfer
- Reliable Keyspan brand
- Long cable length
- Excellent warranty terms
- Clear activity LED
Cons
- Premium pricing tier
- Fixed cable design
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TRIPP LITE is known for reliable peripherals and this unit is no exception. The 3 year warranty offers strong protection against defects for business users.
While it comes at a higher price the quality and support justify the cost. The fixed cable means you cannot swap it if damaged later.
Ideal for mission critical environments where downtime is not an option. The high speed and brand reputation make it a top choice.
High Speed Performance
At 230 Kbps it transfers data twice as fast as standard serial ports.
Brand Reputation
TRIPP LITE and Keyspan are industry recognized names for reliable connectivity hardware.
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7. StarTech 17in USB to Serial Adapter – Compact Portable Option
StarTech 17in USB to Serial Adapter
Prolific PL2303GT Chipset
512 Byte FIFO
Max Baud 921.6 Kbps
17in Cable Length
Designed for IT professionals on the go this adapter is lightweight and fits easily in a toolkit. The 17in length is sufficient for close proximity tasks.
Pros
- Lightweight portable design
- High baud rate
- Built-in FIFO buffer
- Compact for travel
- 3 year support
Cons
- Shorter cable length
- Less robust casing
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It includes a 512 Byte FIFO buffer which helps manage data flow smoothly. The Prolific PL2303GT chipset supports high baud rates for efficient transfers.
The compact design might feel less durable for rough use but it suits office or light field work. Support and warranty are strong for business buyers.
Great for technicians visiting multiple sites who need a reliable small tool. The high baud rate ensures quick diagnostics on complex devices.
Portable Build
The lightweight casing makes it easy to carry daily without adding bulk to your gear.
Data Buffering
A large FIFO buffer reduces data loss during peak traffic times on the line.
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8. DTECH 10 Feet USB 2.0 Adapter – Longest Cable Reach
DTECH 10 Feet USB 2.0 Adapter
FTDI Chipset
10ft Cable Length
LED Light Included
Gold Plated Connector
The standout feature is the 10ft cable which reaches deep into server racks or machinery housings. The FTDI chipset ensures reliable performance over this longer distance.
Pros
- 10 foot cable length
- Stable FTDI chipset
- LED activity light
- Strong signal stability
- Reasonable price
Cons
- Cable can be bulky
- Connector can be stiff
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An LED light helps confirm connectivity without relying on software. Gold plated connectors maintain a stable link despite the longer cable length.
Long cables can be cumbersome to manage and store compared to shorter versions. However for hard to reach ports this length is often necessary.
Best for installations where the computer is far from the device. It solves the reach problem without needing an active extender.
Extended Reach Capability
At 10 feet this adapter bridges large gaps between your computer and remote serial ports.
Connectivity Confidence
The LED light provides an instant visual cue that the link is active and ready.
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9. UGREEN 6FT DB9 Male USB Adapter – Trusted Brand Reliability
UGREEN 6FT DB9 Male USB Adapter
Prolific PL2303 Chipset
6ft Cable Length
Gold Plated Connectors
Flexible PVC Jacket
UGREEN is a well known brand offering reliable connectivity solutions for many users. This adapter includes a flexible PVC jacket that resists tangling and stress.
Pros
- Trusted consumer brand
- Flexible cable jacket
- Easy installation process
- Multiple shielding layers
- Clear product guides
Cons
- Driver needed for older OS
- Standard 256kbps rate
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It features multiple shielding layers for stable signal transmission. The 256kbps rate covers most standard serial needs effectively.
You may need to install a driver for older systems which is a standard practice for these adapters. The product guides are clear for setup steps.
Recommended for general office use needing a dependable connection. The build quality and brand reputation provide confidence in daily use.
Cable Durability
The flexible PVC jacket makes bending and routing the cable much easier daily.
Signal Stability
Multiple shielding layers protect against interference ensuring consistent data transfer.
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10. StarTech 3ft USB to Serial Cable – Versatile Connector Options
StarTech 3ft USB to Serial Cable
Prolific PL2303GC Chipset
512 Byte FIFO
Max Baud 230.4 Kbps
3ft Cable Length
This adapter includes secure screw lock nuts to prevent accidental disconnection in busy environments. It supports a versatile range of industrial devices like printers and PLCs.
Pros
- Secure screw lock nuts
- 2 year warranty support
- Versatile industrial use
- Stable FIFO buffer
- Professional grade build
Cons
- Shorter cable length
- Limited max baud rate
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The Prolific chipset offers reliable performance with a 512 Byte FIFO buffer. This ensures smooth data flow during active sessions.
The 3ft length is compact and limits reach to nearby ports. It is ideal for setups where the host computer is close to the peripheral.
Best for IT pros managing server racks with short cable runs. The secure locking nuts add essential stability for mission critical setups.
Secure Connection
Screw lock nuts keep the cable firmly attached even during movement or vibration.
Industrial Suitability
Designed for logistics and automation tasks requiring consistent reliable serial access.
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Buying Guide – How to Choose the Best D Sub to USB Adapter
Selecting the right adapter requires checking chipset compatibility and physical build quality to ensure stable operation.
Chipset Quality
The chipset inside the adapter determines stability and driver support. Look for FTDI or Prolific chipsets as they are widely supported and less prone to conflicts.
Choose reputable chipsets to avoid data loss or connection drops during critical operations.
Cable Length
Consider the distance between your computer and the legacy device. Some adapters offer 6ft or 10ft cables while others are short 1ft versions.
Select a length that reaches comfortably without excess slack that can cause tripping hazards.
Connector Security
Some DB9 connectors include screw locks or fixed nuts to prevent accidental unplugging. This is vital for devices that vibrate or are moved often.
Always check for locking mechanisms if the device is in a busy or industrial area.
Operating System Support
Verify that the adapter works with your specific OS version like Windows 11 or Linux. Modern adapters often require manual driver installation for full functionality.
Ensure the manufacturer provides updated drivers for current operating systems before purchasing.
Shielding and Build
Industrial environments often have electrical noise that can corrupt data. Adapters with multiple shielding layers or tinned copper conductors resist this interference.
Prioritize models with robust shielding if you work near heavy machinery or motors.
Warranty and Support
A longer warranty period indicates confidence in the product build. Look for providers offering at least 1 year of support and technical assistance.
Good support ensures you can resolve issues quickly if a driver conflict arises.
Data Transfer Speed
Serial devices vary in their required baud rates. High speed adapters support up to 920 kbps which is useful for data logging or faster peripherals.
Check your device requirements to ensure the adapter can meet the minimum speed needed.
How to Use and Care for Your D Sub to USB Adapter
First install the necessary drivers from the manufacturer website before connecting the hardware to ensure proper recognition by the system.
Next plug the USB end into your computer and connect the DB9 end to the serial device making sure to secure any locking nuts firmly.
Finally keep the cable away from heat sources and sharp edges to maintain signal integrity over time during regular use.
Frequently Asked Questions
Is this adapter a VGA video converter?
No these adapters are for serial data not video. They connect devices like modems or industrial controllers but do not transmit video signals to a monitor.
Do I need to install drivers for this adapter?
Most modern adapters need drivers for full functionality. While some systems detect them automatically installing the latest drivers ensures stable performance.
Can I use this with Linux or Mac systems?
Yes most options support macOS and Linux. Always check the specific compatibility list on the product page to confirm driver availability for your version.
What is the difference between FTDI and Prolific chipsets?
FTDI is often considered more robust for industrial use but Prolific is common and affordable. Both work well for standard serial communication tasks.
Why does my connection drop randomly?
Drops can happen due to loose connections or driver issues. Secure the DB9 connector firmly and ensure the driver is up to date on your computer.
Does this work with my 9 pin printer?
Yes if your printer has a DB9 serial port it should work. Ensure the gender of the connector matches your device port before purchasing.
Final Thoughts on Choosing the Best D Sub to USB Adapter
We reviewed ten top rated adapters focusing on stability and build quality. The FTDI models offer superior reliability while budget options provide great value.
Prioritize chipset quality and cable length when choosing. These factors directly impact performance in both office and industrial environments.
Remember to check current availability and pricing before finalizing your purchase. Reliable serial connections are essential for keeping legacy hardware running smoothly.