SABRENT USB 2.0 to Serial DB9 RS232 Male Adapter Cable (CB-DB9P)
4.4Editor score
Prolific PL2303GS Chipset
Fixed Hex Standoffs Included
Bus Powered Design
In this guide
Connecting legacy serial devices to modern computers requires reliable adapters. A quality D Sub to USB adapter ensures stable data transfer and broad system compatibility for professional and home use cases.
We evaluated ten top-rated models based on chipset reliability, cable durability, and driver support. This list covers various lengths and features to help you choose the right adapter for your specific hardware needs.
Each pick highlights key strengths and limitations found in real-world usage. Prices and availability change frequently so verify current details before purchasing to ensure you get the best value today.
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 for Windows 11,10, 8, 7, Vista, XP, 2000, Linux and Mac OS(6ft)
4.6Editor score
FTDI Chipset Included
Gold Plated Connectors
Six Foot Cable Length
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
Up to 230 Kbps
Three Year Warranty
LED Status Indicator
Top 10 Best D Sub to USB Adapter in 2026 Compared
The following table provides a quick side-by-side overview of the top ten D Sub to USB adapters. Compare key specifications like chipset type, cable length, and warranty to find the model that best fits your technical requirements.
ProductsSpecificationsEditor scorePrice
Editor's Choice
USB to RS232 FTDI Adapter
FTDI Chipset
6 Feet Length
1Mbps Transfer Rate
Gold Plated Connectors
4.6Editor score
Editor's Choice
IOGEAR USB to PDA/Serial Adapter
USB 1.1 2.0
12 Inch Length
96 Byte Buffer
LED Status Light
4.7Editor score
Best Premium
SABRENT USB 2.0 to Serial DB9
Prolific Chipset
Male DB9 Plug
All 9 Signals
Bus Powered
4.4Editor score
BENFEI USB to Serial Adapter
Prolific Chipset
6 Feet Length
1Mbps Transfer Rate
Triple Shielding
4.2Editor score
StarTech.com USB to RS232 Serial Adapter
COM Port Retention
1 Foot Length
Up to 920 kpbs
TAA Compliant
4.5Editor score
TRIPP LITE Keyspan USB to Serial
Up to 230 Kbps
3 Foot Length
LED Activity Indicator
3 Year Warranty
4.6Editor score
StarTech USB to Serial Adapter Cable
Prolific Chipset
17 Inch Length
512 Byte FIFO
Max Baud 921.6K
4.6Editor score
DTECH 10 Feet USB to RS232
FTDI Chipset
10 Feet Length
Gold Plated Connector
LED Light Included
4.6Editor score
UGREEN 6FT DB9 Male USB Adapter
Prolific Chipset
6 Feet Length
Up to 256kbps
PVC Jacket
4.6Editor score
StarTech 3ft USB to Serial Cable
Prolific Chipset
3 Foot Length
Up to 230.4 Kbps
512 Byte FIFO
4.5Editor score
1. USB to RS232 FTDI Adapter – Best Overall Performance
USB to RS232 FTDI Adapter
FTDI Chipset Included
Gold Plated Connectors
Six Foot Cable Length
Supports Multiple OS
This USB to RS232 adapter stands out for its reliable FTDI chipset which ensures stable connections across many operating systems. It features a robust six foot cable and gold plated connectors that enhance durability and signal integrity during data transfers.
Pros
- Reliable FTDI chipset
- Long six foot cable
- Gold plated connectors
- Wide OS support
- Durable PVC cable
Cons
- Requires driver download
- Not compatible with VGA
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The adapter supports a wide range of applications including connecting serial modems ISDN terminals and barcode scanners to modern computers. Users benefit from plug and play functionality with minimal setup required on newer Windows versions while older systems may need manual driver installation.
While the device is highly reliable users should note it is strictly for serial data and not video output. Additionally confirming the port gender before purchase is essential as this model uses a male DB9 connector which may not fit all devices.
Ideal for IT professionals and hobbyists alike this adapter provides a dependable bridge between legacy hardware and modern USB ports. Its combination of quality build materials and broad compatibility makes it a top choice for reliable serial connectivity.
Enhanced Data Stability
The FTDI chipset ensures consistent data transmission rates up to 1Mbps reducing the risk of corruption during critical operations.
Durable Construction
Gold plated connectors and a reinforced PVC jacket protect against wear and tear ensuring long term reliability in demanding environments.
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2. IOGEAR USB to PDA/Serial Adapter – Budget Friendly Option
IOGEAR USB to PDA/Serial Adapter
USB 1.1 2.0 Compatible
LED Status Light
96 Byte Buffer
Remote Wakeup Support
The IOGEAR adapter is a solid budget choice for users needing basic serial connectivity without advanced features. Its compatibility with older USB 1.1 standards makes it versatile for legacy systems while still functioning on modern USB 2.0 ports.
Pros
- Compatible with USB 1.1 and 2.0
- LED status light for monitoring
- Includes PC and Mac drivers
- Supports remote wakeup
- Three year limited warranty
Cons
- Short 12 inch cable
- Not for high baud rates
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This adapter includes an LED status light which helps users monitor data transfer activity visually. It supports remote wakeup and power management features making it suitable for use with GPS devices and other portable serial hardware.
Despite its affordable price the adapter comes with a three year limited warranty which adds peace of mind for buyers. However the twelve inch cable length may limit flexibility in setups where devices are placed further from the computer.
Best suited for occasional use or stationary setups this adapter offers reliable performance for straightforward serial communication tasks. Its included drivers ensure easy setup on both Windows and Mac systems without extra configuration steps.
Wide USB Compatibility
Supports both USB 1.1 and 2.0 standards ensuring it works with older and newer computers without issues.
Visual Data Monitoring
The LED status light provides immediate visual feedback on data transfer activity for easy troubleshooting.
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3. SABRENT USB 2.0 to Serial DB9 – Value Leader
SABRENT USB 2.0 to Serial DB9
Prolific PL2303GS Chipset
All 9 Signals Wired
Fixed Hex Standoffs
Bus Powered
This SABRENT adapter delivers excellent value with its low price and reliable performance for common serial tasks. The included fixed hex standoffs help secure the connection which is useful for industrial environments where vibration might otherwise loosen cables.
Pros
- Affordable price point
- Includes fixed hex standoffs
- Full 9 signal support
- High baud rate support
- Easy driver installation
Cons
- Fixed standoffs may not fit all
- Requires driver on some systems
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It supports all nine signals required for full duplex communication ensuring compatibility with routers PLCs and POS terminals. The Prolific chipset enables baud rates up to 460800 bps providing fast data transfer for most applications.
Users should note that Windows systems may detect it automatically while others require manual driver installation. The bus powered design means no external power source is needed simplifying setup and reducing cable clutter.
Ideal for home users and small businesses this adapter offers a practical solution for connecting legacy hardware. Its combination of features and cost makes it a top contender for those seeking reliability without breaking the budget.
Secure Connection Design
Fixed hex standoffs ensure a stable connection reducing the risk of accidental disconnections during use.
Full Signal Support
All nine signals are wired enabling complete compatibility with devices requiring full serial protocol features.
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4. BENFEI USB to Serial Adapter – Reliable Everyday Use
BENFEI USB to Serial Adapter
Prolific PL-2303 Chipset
Triple Shielding
Six Feet Length
18 Month Warranty
The BENFEI adapter provides a dependable solution for daily serial connectivity tasks with a focus on durability. Its triple shielding design helps protect data integrity against electromagnetic interference making it suitable for environments with high electrical noise.
Pros
- Six foot cable length
- Triple shielding for noise
- 18 month warranty
- Wide OS compatibility
- Tinned copper conductor
Cons
- No LED status indicator
- Lower rating than peers
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With a six foot cable it offers more flexibility than shorter adapters allowing devices to be placed further away from the computer. The tinned copper conductors ensure stable electrical connections and reduce resistance during data transmission.
An 18 month warranty covers potential defects giving buyers confidence in the product longevity. Setup is straightforward with plug and play functionality on supported systems though some older OS versions may need manual driver setup.
Best for users needing moderate cable length and reliable performance this adapter balances cost and functionality. It is an excellent choice for general office or home use where extreme data rates are not required.
Noise Protection
Triple shielding minimizes interference ensuring stable data transmission even in electrically noisy environments.
Extended Reach
The six foot cable allows for greater flexibility in placing serial devices away from the computer host.
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5. StarTech.com USB to RS232 Serial Adapter – Port Retention Specialist
StarTech.com USB to RS232 Serial Adapter
COM Port Retention
Up to 920 kpbs
1 Foot Length
TAA Compliant
This StarTech adapter is designed for professional environments where consistent COM port assignment is critical. Its nonvolatile memory retains assigned COM port values ensuring seamless reconnection even if the adapter is unplugged and reattached later.
Pros
- Retains COM port values
- High data transfer rate
- TAA compliant for government
- Durable professional build
- Easy integration
Cons
- Very short one foot cable
- Higher price point
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Supporting data rates up to 920 kbps it handles demanding industrial applications like sensor monitoring and digital signage control. The one foot length is compact making it ideal for tight server racks or setups where devices are adjacent to the computer.
TAA compliance makes it suitable for government and enterprise procurement requiring domestic sourcing standards. While the higher price reflects its specialized features users gain reliability and reduced configuration hassles in complex IT networks.
Best for IT professionals managing multiple serial devices this adapter simplifies integration and maintenance. Its robust design ensures long term stability in mission critical systems where connection consistency cannot be compromised.
Persistent COM Port Assignment
Nonvolatile memory retains COM port values ensuring consistent device recognition after disconnection and reconnection.
Enterprise Ready Compliance
TAA compliant certification meets government procurement standards for secure and domestic hardware sourcing.
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6. TRIPP LITE Keyspan USB to Serial – High Speed Transfer
TRIPP LITE Keyspan USB to Serial
Up to 230 Kbps
LED Activity Indicator
3 Foot Length
3 Year Warranty
This TRIPP LITE adapter stands out for its ability to deliver data speeds up to 230 Kbps which is twice the rate of standard built in serial ports. This increased throughput benefits applications requiring faster data exchanges like firmware updates or heavy logging.
Pros
- Twice standard serial speed
- LED status indicator
- Three year warranty
- Plug and play design
- Bus powered
Cons
- Limited baud rate options
- Price higher than budget models
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A built in LED indicator shows adapter status and data activity at a glance helping users quickly verify connectivity without software tools. The three foot cable provides a balance between portability and flexibility for most desktop setups.
Backed by a three year warranty it offers long term protection and peace of mind for business users. Plug and play convenience ensures the adapter appears as a standard COM port ready for immediate use by any supporting application.
Ideal for professionals needing reliable and fast serial communication this adapter delivers performance with minimal setup. Its durable construction and clear status indicators make it a practical choice for both office and field applications.
Fast Data Throughput
Supports up to 230 Kbps providing twice the speed of legacy serial ports for efficient data transfers.
Visual Activity Monitoring
LED status indicator provides immediate feedback on connection state and data activity for easy troubleshooting.
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7. StarTech USB to Serial Adapter Cable – Portable Choice
StarTech USB to Serial Adapter Cable
17 Inch Length
512 Byte FIFO
Max Baud 921.6K
Prolific Chipset
This compact StarTech adapter is designed for IT professionals who need reliable serial connectivity on the go. Its 17 inch cable length makes it highly portable while still providing enough reach for most direct device connections without clutter.
Pros
- Compact 17 inch cable
- 512 byte FIFO buffer
- Max baud rate 921.6K
- Lightweight design
- Lifetime technical assistance
Cons
- Short for some setups
- Requires drivers on older OS
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The 512 byte FIFO buffer helps manage data flow efficiently reducing the risk of overflows during bursts of transmission. With a maximum baud rate of 921.6K it supports high speed applications including network switches and medical devices.
Users benefit from free lifetime technical assistance which provides ongoing support for troubleshooting and configuration. The lightweight design ensures it fits easily into carrying cases making it ideal for field service work or travel.
Best for technicians and auditors needing a dependable portable solution this adapter balances performance and convenience. Its robust build and comprehensive support options make it a trusted tool for professional environments.
Optimized Data Buffer
512 byte FIFO buffer ensures smooth data flow during high volume transfers preventing potential data loss.
Professional Support
Free lifetime technical assistance provides expert help whenever users need configuration or troubleshooting support.
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8. DTECH 10 Feet USB to RS232 – Extended Length
DTECH 10 Feet USB to RS232
10 Feet Length
FTDI Chipset Included
LED Light Indicator
Gold Plated Connector
The DTECH adapter offers a significant advantage with its ten foot cable length which is ideal for connecting devices placed far from the computer. This extended reach reduces the need for additional extension cables keeping setups cleaner and more organized.
Pros
- Long 10 foot cable
- FTDI chipset for reliability
- LED status indicator
- Gold plated connectors
- Wide OS support
Cons
- Cable may be too long for some
- Heavier due to length
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Equipped with an FTDI chipset it ensures stable performance and broad compatibility across Windows Mac and Linux systems. The LED light indicator helps users quickly verify connection status without needing software diagnostic tools.
Gold plated connectors enhance durability and reduce resistance for consistent signal transmission over the long cable. While the length adds some weight it remains flexible enough for most indoor installations and industrial control panels.
Best for workshops or server rooms where device distance is a constraint this adapter provides both range and reliability. Its combination of features makes it a practical choice for users prioritizing flexibility in cable placement.
Extended Reach Capability
Ten foot cable allows connecting devices located further away eliminating the need for additional extension adapters.
Visual Status Check
Built in LED light provides immediate visual confirmation of connection status and data activity.
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9. UGREEN 6FT DB9 Male USB Adapter – Driver Free Experience
UGREEN 6FT DB9 Male USB Adapter
Driver Free for Win8+
Prolific Chipset
Up to 256kbps
Gold Plated Connectors
This UGREEN adapter simplifies setup with its driver free functionality on Windows 8 and newer systems allowing immediate use after plugging in. Its flexible PVC jacket prevents tangling making it easy to manage in crowded or temporary setups.
Pros
- Driver free on modern Windows
- Flexible PVC jacket
- Gold plated connectors
- Six foot length
- Stable signal transmission
Cons
- Older systems need drivers
- Limited to 256kbps
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The gold plated connectors ensure durable connections and protect against corrosion over time. Supporting transmission rates up to 256kbps it handles most common serial tasks efficiently including programming PLCs and reading barcode scanners.
Multiple shielding layers maintain signal stability and protect data from loss during transfers. While older Windows versions or Linux may require manual driver installation the process is straightforward with provided guides.
Best for modern Windows users this adapter offers convenience and reliability without extra configuration. Its build quality and ease of use make it a strong candidate for office and light industrial applications.
Instant Plug And Play
Driver free functionality on modern Windows allows immediate use without additional software installation.
Tangle Free Design
Flexible PVC jacket prevents tangling and makes cable management easier in compact workspaces.
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10. StarTech 3ft USB to Serial Cable – Dual Compatibility
StarTech 3ft USB to Serial Cable
Up to 230.4 Kbps
Screw Lock Nuts
3 Foot Length
512 Byte FIFO
This StarTech adapter uniquely supports both DB9 and DB25 serial devices offering versatility for mixed legacy hardware environments. The included screw lock nuts secure the connection preventing accidental disconnections which is vital in industrial settings.
Pros
- Compatible with DB9 and DB25
- Screw lock nuts for security
- 3 foot cable length
- High speed transfer
- Lifetime technical assistance
Cons
- Limited OS support noted
- May need manual drivers
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With a maximum baud rate of 230.4 Kbps it provides fast data transfer suitable for configuring network switches and medical equipment. The 512 byte FIFO buffer manages data flow efficiently ensuring smooth communication during high volume operations.
Backed by lifetime technical assistance users can rely on expert support for any configuration challenges. While the three foot length is moderate it fits well in standard rack setups without excess cable clutter.
Ideal for IT teams managing diverse legacy hardware this adapter offers broad compatibility and robust build quality. Its secure connection features and support options make it a reliable tool for professional maintenance tasks.
Dual Connector Compatibility
Supports both DB9 and DB25 devices making it versatile for mixed legacy hardware environments.
Secure Screw Locks
Screw lock nuts secure the connection preventing accidental disconnections in busy or vibrating environments.
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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 evaluating several technical factors to ensure compatibility and reliable performance with your specific hardware.
Chipset Compatibility
The chipset inside the adapter determines driver support and stability. FTDI chipsets are generally considered more reliable across various operating systems compared to Prolific alternatives which may face driver conflicts on newer OS versions.
Always verify that the chipset is supported by your specific operating system before purchase to avoid installation issues.
Connector Type and Gender
Ensure the adapter matches the gender and pin configuration of your serial device. Most common adapters use a male DB9 connector but some devices may require female ends or different pinouts which can affect functionality.
Check your device port details carefully to confirm compatibility before ordering to avoid returns.
Cable Length
Choose a cable length that suits your workspace setup. Shorter cables reduce clutter but limit device placement while longer cables offer flexibility but may be bulkier to manage.
Select a length that allows comfortable device positioning without excess slack.
Data Transfer Rate
Higher baud rates support faster data transfers which are essential for applications requiring quick communication like firmware updates. Ensure the adapter supports the required speed for your device to prevent bottlenecks.
Look for adapters supporting at least 230 Kbps for most professional applications.
Operating System Support
Confirm that the adapter provides drivers or plug and play support for your specific OS. Windows versions may require different driver handling compared to macOS or Linux systems.
Check product documentation for explicit OS compatibility to ensure smooth installation.
Build Quality and Shielding
Durable connectors and shielding protect against physical wear and electrical interference. Gold plated connectors and shielded cables extend lifespan and maintain signal integrity in noisy environments.
Prioritize models with robust construction for industrial use cases.
Warranty and Support
A longer warranty period indicates manufacturer confidence in product durability. Lifetime or multi year warranties provide protection against defects and ensure access to technical help.
Choose adapters with reliable customer support for troubleshooting any connectivity issues.
Power Requirements
Most adapters are bus powered drawing energy directly from the USB port eliminating the need for external power sources. However some high demand devices may require additional power which should be verified.
Ensure your adapter supports bus power for convenient setup without extra cables.
How to Use and Care for Your D Sub to USB Adapter
Begin by installing any required drivers from the manufacturer's website before connecting the adapter. This step ensures the operating system recognizes the COM port correctly and allows applications to access the serial interface.
Plug the USB end into your computer and the DB9 connector into your device. Verify the connection status using any available LED indicators or device manager tools to confirm active data transmission.
Store the adapter in a dry and dust free environment when not in use to protect the connectors from corrosion. Avoid bending the cable sharply to maintain internal wiring integrity and ensure long term reliability.
Frequently Asked Questions
Does this adapter support video output?
No these adapters are designed solely for serial data communication and do not support video output. For video you will need a dedicated VGA or HDMI adapter.
Are drivers required for all operating systems?
Modern Windows systems often support plug and play but macOS and Linux typically require manual driver installation. Always check product documentation for specific OS requirements.
Can I use this with DB25 ports?
Some adapters support DB25 through compatible connectors but many are strictly DB9. Verify the model specifications to ensure it matches your device port type.
What is the maximum baud rate supported?
Most adapters support baud rates up to 230 Kbps or higher. Confirm the specific rating in the product details for high speed applications.
Is external power needed for these adapters?
Most are bus powered drawing energy from the USB port without needing external power sources. Ensure your device has sufficient USB power for operation.
Do these adapters work with industrial PLCs?
Yes they are commonly used to connect and configure industrial PLCs and other equipment. Ensure the adapter matches the required serial protocol for your PLC model.
Final Thoughts on Choosing the Best D Sub to USB Adapter
Selecting the right D Sub to USB adapter depends on your specific needs regarding chipset reliability cable length and operating system support. The top picks offer robust performance for both casual and professional use cases.
Prioritize models with proven chipsets like FTDI for maximum compatibility and stability. Ensure the connector type matches your hardware to avoid connection issues during setup.
Always verify current pricing and availability before purchasing to get the best value for your investment. Regular updates may affect product features so checking recent reviews can provide additional insights.