SABRENT USB 2.0 to Serial DB9 RS232 Male Adapter Cable
4.4Editor score
Prolific Chipset
Fixed nuts included
960Kbps baud rate
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 hardware and new operating systems seamlessly.
We evaluated ten top-rated models based on chipset reliability, cable length, compatibility, and user feedback. Our testing process ensures you get a product that works consistently.
Each pick highlights specific strengths and ideal use cases for different professionals. Remember that prices fluctuate frequently, so check current listings before making your final purchase decision today.
Top 3 Picks for Best D Sub to USB Adapter
USB to RS232 USB Serial Adapter with FTDI Chipset
4.6Editor score
FTDI Chipset included
Windows 11 compatible
6ft cable length
TRIPP LITE Keyspan High-Speed USB to Serial Adapter
4.6Editor score
3-Year Warranty
LED status light
230 Kbps speed
Top 10 Best D Sub to USB Adapter in 2026 Compared
This side-by-side comparison highlights key specifications for all ten selected adapters to help you find the exact match for your serial device needs.
ProductsSpecificationsEditor scorePrice
Editor's Choice
USB to RS232 FTDI
Chipset: FTDI FT232
Cable: 6 feet
Rate: 1Mbps
OS: Win/Mac/Linux
4.6Editor score
Editor's Choice
IOGEAR GUC232A
Chipset: IOGEAR
Cable: 12 inches
Buffer: 96 byte
Warranty: 3 Years
4.7Editor score
Best Budget
SABRENT CB-DB9P
Chipset: Prolific PL2303
Cable: N/A
Rate: 460Kbps
Warranty: 1 Year
4.4Editor score
BENFEI USB to Serial
Chipset: Prolific PL2303
Cable: 6 feet
Rate: 1Mbps
Warranty: 18 Months
4.2Editor score
StarTech ICUSB232PRO
Chipset: Custom
Cable: 1 foot
Rate: 920Kbps
Feature: COM Retention
4.5Editor score
TRIPP LITE USA-19HS
Chipset: Keyspan
Cable: 3 feet
Rate: 230Kbps
Warranty: 3 Years
4.6Editor score
StarTech ICUSB232V2
Chipset: Prolific PL2303
Cable: 17 inches
Rate: 921Kbps
FIFO: 512 Byte
4.6Editor score
DTECH USB to Serial
Chipset: FTDI FT232RL
Cable: 10 feet
Rate: 1Mbps
LED: Included
4.6Editor score
UGREEN DB9 USB Adapter
Chipset: Prolific PL2303
Cable: 6 feet
Rate: 256Kbps
Connector: Gold Plated
4.6Editor score
StarTech ICUSB232DB25
Chipset: Prolific PL2303
Cable: 3 feet
Rate: 230Kbps
Port: DB9 or DB25
4.5Editor score
1. USB to RS232 – Best Overall D Sub to USB Adapter
USB to RS232 USB Serial Adapter with FTDI Chipset
FTDI Chipset ensures reliability
6ft cable length is standard
Supports Windows 11 and Mac
Data rate up to 1Mbps
This adapter stands out with its genuine FTDI chipset which guarantees stable data transmission across various legacy devices. It is highly rated for connecting modems and PLCs seamlessly.
Pros
- High quality FTDI chipset
- Compatible with many operating systems
- No external power required
- Gold plated connectors for durability
Cons
- Male DB9 only not VGA
- Driver installation needed for some systems
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The inclusion of a 6-foot cable provides ample reach for industrial or office setups where the PC may be distant. Gold-plated connectors ensure long-term signal integrity without oxidation.
Users must note that this is a serial adapter not a video converter. While driver installation is required on older Windows versions the plug-and-play nature on newer systems is convenient.
It is the ideal choice for IT professionals needing reliable serial access on modern machines. The robust construction and broad compatibility make it a top recommendation for general use.
Chipset Reliability
The FTDI chipset is renowned for its stability and driver support which minimizes data corruption during transfers.
Cable Flexibility
A six-foot cable allows for flexible placement of connected equipment without needing extension cords.
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2. IOGEAR GUC232A – Best for GPS Devices
IOGEAR USB to PDA/Serial (DB9) Adapter w/ PC & Mac Drivers
USB 1.1 and 2.0 compatible
LED status light included
Remote wakeup support
96 byte buffer for data
The IOGEAR adapter is specifically optimized for converting serial GPS units to USB making it a niche favorite. Its LED light provides visual confirmation of data transfer which is very helpful.
Pros
- Excellent for GPS conversion
- LED light shows data activity
- Supports remote wakeup
- High user rating
Cons
- Short 12 inch cable
- Older USB 1.1 support
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With support for remote wakeup and power management it integrates well into power sensitive systems. The buffer ensures data is not lost during high load periods.
The short cable length limits its use to desktop setups directly next to the computer. Users needing distance will require an extension cable which adds to the cost.
It is best suited for field technicians or hobbyists using GPS equipment with serial ports. The robust driver support ensures it works on both PC and Mac platforms reliably.
GPS Connectivity
Designed to convert serial interfaces on GPS units to USB for seamless integration with modern computers.
Visual Feedback
The LED status light allows users to monitor data transfer activity at a glance.
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3. SABRENT CB-DB9P – Best Value D Sub to USB Adapter
SABRENT USB 2.0 to Serial DB9 RS232 Male Adapter Cable
Prolific PL2303GS Chipset
Fixed hex standoffs
All 9 signals wired
Baud rates to 460Kbps
This SABRENT cable offers a cost-effective solution for connecting PLCs and routers to modern USB ports. The fixed nuts secure the connection preventing accidental disconnection during use.
Pros
- Affordable price point
- Fixed nuts included
- High baud rate support
- 100% electrically tested
Cons
- Driver install on Windows 7
- Not for video signals
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It supports all nine RS-232 signals ensuring compatibility with various industrial equipment. The electrical testing before packing ensures every unit functions correctly out of the box.
While it lacks the premium feel of expensive models it performs reliably for basic serial tasks. Users should install drivers manually on older Windows systems to avoid detection issues.
Budget conscious buyers will find this adapter sufficient for standard configuration tasks. It is a solid workhorse for IT departments managing legacy hardware on a tight budget.
Secure Connection
Two fixed hex standoffs ensure the adapter stays firmly connected to the device port.
Signal Integrity
All nine RS-232 signals are wired to support a wide range of serial protocols.
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4. BENFEI USB to Serial – Best Cable Length
BENFEI USB to Serial Adapter
Prolific PL-2303 Chipset
6 feet cable length
Tinned copper conductors
Triple shielding included
BENFEI offers a 6-foot cable that provides excellent reach for connecting devices located further from the computer. The triple shielding protects data transfer from electromagnetic interference in noisy environments.
Pros
- Long 6ft cable included
- Triple shielding reduces interference
- 18 month warranty
- Wide OS compatibility
Cons
- Lower rating than competitors
- Driver installation required
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It is powered directly by the USB port requiring no external power adapter for simple setup. The warranty coverage extends to 18 months which is generous for this price range.
User reviews suggest occasional driver hiccups on specific OS versions but mostly function well. The cable quality is sturdy enough for daily industrial use or office configurations.
This is a great option for those who need extra cable length without buying separate extensions. It balances cost and functionality effectively for general serial communication needs.
Extended Reach
A 6-foot cable allows users to connect devices further away from their desktop computer.
Shielding
Triple shielding ensures reliable data transfer even in environments with high electrical noise.
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5. StarTech ICUSB232PRO – Best for Enterprise
StarTech.com 1 ft. USB to RS232 Serial DB9 Adapter Cable
COM Port Retention memory
Professional grade solution
Up to 920 kbps
TAA Compliant
StarTech provides a professional grade adapter designed for enterprise environments requiring strict compliance. The COM Port Retention feature ensures the assigned port remains consistent even after disconnects.
Pros
- COM Port Retention feature
- Industrial grade reliability
- Fast data transfer
- TAA compliance for gov
Cons
- Short 1 ft cable
- Higher price point
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This stability is crucial for software applications that rely on specific COM port addresses for operation. It supports high data rates up to 920 kbps for efficient data exchange.
The short cable length restricts use to close proximity connections unless extensions are used. It is pricier than budget options but justifies the cost with superior reliability and features.
Government or industrial buyers needing TAA compliance will find this adapter essential. It is the best choice for critical systems where connection stability is paramount.
Port Stability
COM Port Retention keeps the assigned serial port value in memory for consistency.
Enterprise Standards
TAA compliance makes this adapter suitable for government and enterprise procurement.
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6. TRIPP LITE USA-19HS – Best Premium Build
TRIPP LITE Keyspan High-Speed USB to Serial Adapter
3-Year Warranty
LED status light
Up to 230 Kbps
Keyspan Chipset
This TRIPP LITE adapter is built with premium materials that withstand frequent use. The 3-year warranty offers peace of mind for professionals relying on this gear daily.
Pros
- Extended 3 year warranty
- LED activity indicator
- Fast transfer speed
- Robust build quality
Cons
- Expensive compared to others
- Older chipset model
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The LED light provides instant feedback on data activity which helps diagnose connection issues quickly. It supports data transfer rates twice as fast as standard serial ports.
The price is high but the durability and warranty make it a long-term investment. It works well for demanding tasks requiring consistent serial throughput without interruptions.
Users seeking the highest reliability should consider this premium option. It is ideal for environments where hardware failure is not an option.
Warranty Coverage
A 3-year warranty ensures long term protection against defects and failure.
Speed
Supports data transfer rates up to 230 Kbps for quick operations.
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7. StarTech ICUSB232V2 – Best IT Professional Choice
StarTech 17in 1-Port USB to Serial Adapter Cable
43cm Cable Length
512 Byte FIFO
Prolific Chipset
3 Year Warranty
Designed specifically for IT professionals this adapter is portable and efficient. The lightweight design fits easily into a carrying case for field technicians visiting client sites.
Pros
- Designed for IT Pros
- Lightweight portable design
- High speed baud rates
- Multi-lingual support
Cons
- Short cable length
- Requires driver install
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It supports high baud rates and includes a 512 byte FIFO buffer for smooth data transmission. The 3-year warranty and technical assistance provide strong support for business users.
The short cable means it is best for direct connections. It is not suitable for remote setups without additional hardware but excels at portability.
Professionals who travel to fix legacy systems will appreciate its compact nature. It is a reliable tool for quick configuration of PLCs and medical devices.
Portability
Lightweight design allows it to fit easily into carrying cases for field work.
Technical Support
Free lifetime multi-lingual technical assistance is included with the purchase.
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8. DTECH 10ft – Best Long Distance
DTECH 10 Feet USB 2.0 to RS232 DB9 Serial Port Adapter
10 feet cable length
FTDI Chipset included
Crystal blue cable
LED status light
For those needing maximum reach this DTECH adapter offers a solid 10-foot cable. This length allows devices to be placed far from the computer without signal degradation.
Pros
- Very long 10ft cable
- Reliable FTDI chipset
- LED status indicator
- High quality build
Cons
- Thick cable might be stiff
- Price higher than average
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It uses a genuine FTDI chipset ensuring compatibility and speed. The LED light helps users confirm the connection status instantly.
The cable is built to be durable with strong connectors. Some users might find the cable thickness stiff but it provides physical robustness.
This is the top pick for setups where distance is a primary constraint. It eliminates the need for expensive active extenders.
Maximum Reach
A 10-foot cable allows for placement of devices up to 10 feet away.
Chipset Choice
FTDI chipset ensures the highest level of reliability for data transfers.
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9. UGREEN DB9 Adapter – Best User Friendly
UGREEN 6FT DB9 Male 9 Pin USB to Serial Adapter
Gold plated connectors
PVC jacket cable
256Kbps transmission
PL2303 chipset
UGREEN provides a user friendly adapter with gold plated connectors for better durability. The flexible PVC jacket makes cable management easy without tangling.
Pros
- Easy to use design
- Gold plated durability
- Flexible PVC jacket
- Stable signal
Cons
- Driver needed for Mac
- Shorter than 10ft
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It offers stable signal transmission which is crucial for data integrity. The chipset ensures reliable connectivity across most modern systems.
Mac users will need to install drivers manually which is standard. For Windows users it works seamlessly for most standard applications.
This is a solid general purpose choice for home and office use. It offers good value and reliability for standard serial tasks.
Durability
Gold plated connectors ensure long term connection quality and resistance.
Design
A flexible PVC jacket prevents tangling and makes storage easy.
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10. StarTech ICUSB232DB25 – Best for DB25
StarTech 3ft 1-Port USB to Serial Cable
DB9 or DB25 compatible
3ft cable length
512 Byte FIFO
2-year warranty
This StarTech adapter is unique for supporting both DB9 and DB25 connectors. It is ideal for older industrial equipment that uses the wider DB25 port.
Pros
- Supports DB25 connectors
- Industry standard quality
- Screw lock nuts
- IT Pro choice
Cons
- Short 3ft cable
- Requires driver install
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The screw lock nuts secure the connection firmly preventing accidental pulls. It is built for the IT professional who needs robust and compatible hardware.
The cable is short so it is best for desktop use. It is not designed for long distance but for direct port access.
Users with legacy DB25 equipment should choose this adapter. It bridges the gap to modern USB systems effectively.
DB25 Support
Supports both DB9 and DB25 connectors for wider legacy device compatibility.
Security
Screw lock nuts ensure the adapter stays securely attached to the device.
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Buying Guide – How to Choose the Best D Sub to USB Adapter
Selecting the right adapter requires understanding your specific device interface and computer system requirements.
Chipset Compatibility
The chipset inside the adapter determines its stability and driver support. FTDI and Prolific chipsets are industry standards known for reliability. Always verify the chipset before buying to ensure it matches your operating system needs.
Look for adapters with well-supported chipsets like FTDI to avoid driver issues.
Cable Length
Cable length is critical for your setup. Most adapters come with 1 to 6 feet of cable. If your device is far from your computer, you need a longer cable to avoid signal loss or extra extension costs.
Choose a length that reaches your device comfortably without stretching.
Connector Gender
Ensure the adapter matches your device port. Most serial adapters are male DB9 to USB. If your device has a male DB9 port, you will need a female adapter or a cable with the correct gender.
Check the port gender on your device before ordering.
Driver Requirements
Modern Windows 11 and 10 often include drivers automatically. However, older systems or Mac often need manual driver installation. Verify if the product includes drivers or if you need to download them.
Prefer adapters with easy driver access for better usability.
Baud Rate Support
High baud rates ensure faster data transfer. Look for adapters supporting up to 1Mbps or higher. This is important for applications requiring rapid data exchange like industrial control systems.
Opt for high baud rates for performance.
Build Quality
Durable adapters have metal connectors and shielding. This protects against physical damage and signal interference. Check for gold plating and sturdy cables for longevity.
Select adapters with robust physical construction.
Warranty and Support
A good warranty protects your investment. Most reputable brands offer 1 to 3 year warranties. Check for available technical support in case you face setup issues.
Ensure the product has a solid warranty.
Operating System
Verify compatibility with your OS. Some adapters work only on Windows while others support Linux and Mac. Always check the supported list on the product page.
Confirm OS support before purchase.
How to Use and Care for Your D Sub to USB Adapter
Connect the USB end to your computer and the DB9 end to your serial device. Allow the system to detect the new hardware. If prompted, install the provided driver software from the website.
Configure the COM port settings in your software to match the device requirements. Check the port number in Device Manager and set the correct baud rate for communication.
Keep the adapter away from extreme heat or liquids. Unplug carefully by the connector head not the cable to avoid internal wire damage during use.
Frequently Asked Questions
Is D Sub to USB adapter the same as VGA?
No, this adapter converts serial data not video signals. VGA uses a different DB15 connector. Do not expect video output from this serial converter.
Do I need to install drivers?
It depends on your OS. Windows 11 often detects it automatically. Older systems or Mac usually require manual driver download from the manufacturer.
What is a Prolific chipset?
Prolific PL2303 is a common chipset for serial adapters. It is widely supported but sometimes conflicts occur. Always update the latest driver for best results.
Can I use this for gaming?
No, this adapter is for serial data not game controllers. Gameports and consoles use different interfaces. Ensure your device supports RS232 serial protocol.
Does it support USB 3.0?
Most adapters support USB 2.0 and work on 3.0 ports. They draw power from the USB port. Ensure your computer has a standard USB Type A port.
What is COM Port Retention?
This feature keeps the assigned COM port number even after disconnecting. It is useful for apps that rely on a specific port number for configuration.
Final Thoughts on Choosing the Best D Sub to USB Adapter
We highlighted the top adapters with FTDI and Prolific chipsets for reliable performance. The IOGEAR and StarTech models offer specific strengths for professionals.
Prioritize cable length and chipset compatibility when making your choice. Avoid cheap adapters with unknown chipsets to prevent future data loss issues.
Always check current product listings for price and availability changes. This guide helps you make a smart informed decision for your legacy hardware needs.