Best Serial Adapters Under $100 (2026)
We ranked adapters under $100 by value score using chipset reliability, connector variety (DB9/DB15/breakout), user ratings, and practical features like multi-port support and included cases
This roundup covers serial-to-USB and breakout adapters under $100, focusing on reliable chipsets, connector types, and build quality for electronics and instrumentation work. Picks were chosen by weighing real-world features — like FTDI chipsets, DB9/DB15 breakout options, and multi-port designs — against user ratings and value scores
Top Picks
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1
USB to RS232 adapter with FTDI chipset
USB to serial RS232 adapter converting USB to a null modem DB9 port. Compatible with Windows, Mac, and Linux. Customers praise plug-and-play setup and reliable FTDI FT232R chip
- FTDI-based reliability
- USB to RS232 null modem capability
- cross-platform compatibility
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2
DB9 Male Breakout Connector with Case
DB9 solderless breakout board for RS232 serial connections. Provides easy wiring and durable joints for reliable signal transfer. Customers note solid quality and ease of use, though some find it bulky
- solderless terminal adapter
- case with long bolts
- pure copper plated joints
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3
DB9 breakout connector set (5 male + 5 female) with case
DB9 breakout boards for RS232 serial connections with solderless terminals and durable casing. Easy to wire and assemble; customers note good quality and functionality
- solderless DB9 terminals
- case-protected breakout
- mixed-quality but functional reviews
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4
Gearmo 4 Port USB to RS232 Adapter with FTDI
USB to RS-232 adapter with four ports and FTDI chipset for cross-platform use. Plug-and-play with COM port retention for stable serial connections. Customers note reliable Linux compatibility and solid build quality
- multiplatform compatibility
- four COM ports
- no external power required
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5
DB15 Solderless Connector 15-pin Breakout Board with Case
Solderless DB15 breakout board for RS232 D-SUB ports, with a durable copper joint and protective PP casing. Customers note ease of use and reliable functionality
- durable solder joints
- easy-to-use breakout
- protective outer case
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6
DB9 Female Breakout Connector 10-pack
DB9 female breakout board for solderless RS232 connections with case. Helps wire and build serial cables; users report good quality and ease of use
- solderless RS232 breakout
- durable outer casing
- easy wiring
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7
4 Port USB to RS232 DB9 Serial Adapter Cable (5ft) ELECABLE
USB to RS-232 adapter supporting 4 ports, compatible with MAC, Windows, Android, Linux. Provides remote wake up and power management; suitable for GPS, modems, printers, scanners, cameras. Customer note: reliable performance and good cable quality
- 4-port RS-232 support
- USB to RS-232 conversion
- remote wake up and power management
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8
USB/RS232/TLL to RS232/485/TLL Multibus Converter
Industrial isolated converter supporting USB, RS232, TTL to RS232, 485, TTL with onboard power isolation and protection circuits. Built on FT232RL for reliable USB communication
- multibus isolated converter
- USB/RS232/TTL to RS232/485/TLL
- onboard isolation and protection
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9
DB9 Solderless Breakout Connector 3Male+3Female 9-pin
DB9 solderless breakout with labeled ports for quick wiring. Copper joints and 24K gold-plated connector enhance connectivity and durability. 16mm thin case for flexible wiring
- clear port labeling on both sides
- durable copper joints with gold plating
- lead-free RoHS compliant
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10
DR302 DIN Rail Modbus Gateway: RTU to TCP RS485 to Ethernet
Modbus gateway converting RTU to TCP/UDP with RS485 to Ethernet. Compact, lightweight, simple configuration. Customer insight hints at ease of use
- Modbus RTU to Modbus TCP conversion
- DIN rail mounted gateway
- multi-protocol server/client support