Best Serial Cables Under $100 (2026)
We selected cables under $100 ranked by a value score that combines build quality, connector and protocol compatibility, useful features, and overall user utility
The Verdict
- Best Overall: DB25 serial cable 100 ft male-to-male RS232 — Best for long RS232 runs: sturdy DB25 M-to-M construction built for extended 100 ft connections
- Best Value: USB to RS485 Serial Cable with TX/RX LEDs (1.5m) EZSync — Best for RS485 projects: USB-to-RS485 cable with TX/RX LEDs for clear data-activity feedback
This roundup covers durable serial and PCIe extension cables under $100, chosen for signal reliability, connector type, and real-world value. Picks were ranked by a value score that weights construction, compatibility (RS232/RS485/PCIe), and user-focused features like LEDs or shielded conductors
Top Picks
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1
Best Overall DB25 serial cable 100 ft male-to-male RS232
Best for long RS232 runs: sturdy DB25 M-to-M construction built for extended 100 ft connections
100 ft DB25 male-to-male serial cable, straight-through RS232. High-quality construction noted by users, suitable for Mach3 setups and general serial connections
- long-distance serial cable
- dual DB25 connectors
- straight-through RS232
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2
LINKUP PCIe 5.0 riser cable for vertical GPU mount
Best for vertical GPU setups: PCIe 5.0 riser cable designed for reliable GPU mounting and signal integrity
PCIe 5.0 riser cable designed for vertical GPU mounting and standard layouts. Delivers full 128GB/s on PCIe 5.0 x16 with tuned impedance and shielding. Customers note easy alignment and solid build
- Gen5 x16 performance with full 128GB/s
- Backward-compatible with PCIe 4.0
- Ready for next-gen cards and precise GPU placement
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3
StarTech USB-A to RS232 serial adapter with changeable DB9 screws
Best USB-to-serial adapter: USB-A to RS232 with changeable DB9 screws for secure, flexible connections
USB-A to RS232 adapter with selectable DB9 screws/nuts for mounting. LED indicators show port activity and USB recognition; compatible with Windows and macOS
- changeable DB9 screws/nuts
- real-time LED indicators
- USB-A to RS232 compatibility
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4
Best Value USB to RS485 Serial Cable with TX/RX LEDs (1.5m) EZSync
Best for RS485 projects: USB-to-RS485 cable with TX/RX LEDs for clear data-activity feedback
USB to RS485 serial interface cable with TX/RX LEDs and over-molded electronics. Compatible with Windows and Mac; suitable for RS485 devices. Customers note easy installation and reliable connectivity in tight spaces
- TX/RX LEDs for traffic indication
- Plug-and-play USB to RS485
- Single-chip USB to asynchronous serial transfer
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5
DB9 to 3.5mm serial cable, 6 ft, 5-pack (LIANSHU)
multi-pack: five DB9-to-3.5mm serial cables offering multiple shielded connections for small deployments
LIANSHU DB9 female to 3.5mm stereo serial cable, 6 ft, fully shielded for EMI/RFI. Facilitates RS-232 control signals between a control unit and a display. Customer insight available from provided data
- shielded serial cable
- DB9 to 3.5mm connector
- 6 feet length
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6
PCIe 4.0 x4 extension cable with metal shield
Best for PCIe extension needs: PCIe 4.0 x4 cable with metal shielding to preserve signal quality
PCIe 4.0 x4 extension cable with metal shield. transferspeed PCIe 4.0 x4, 64G/bps max. length adjustable from 5 to 100 cm; suitable for PCIe x4 capture card
- supports PCIe 4.0 x4
- metal shield for protection
- customizable length
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7
Industrial DB9 RS232 serial cable with bare wires, 25 ft
Best for industrial wiring: DB9 RS232 cable with bare-wire leads suited to hardwired installations and field terminations
DB9 female serial cable with tin-coated bare wires and color-labeled pins for easy soldering. 25 ft industrial RS-232 data transfer cable for legacy device connections. customer insight mentions ease of assembly
- tin-coated bare wires with pin labels
- 25 ft industrial-grade RS-232 cable
- DB9 female connectors
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8
USB to RS232 CNC programming cable (DB25 Male) EZSync014C
Best for CNC compatibility: USB-to-RS232 DB25 cable built for CNC programming and legacy machine interfaces
USB to RS232 cable for CNCs with DB25 port; supports software and hardware handshaking for legacy equipment. Customers note easy setup and reliable functionality, though tiny connectors may require careful soldering
- db25 male to usb interface
- cnc programming compatibility
- handshaking support
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9
DB25 M/M RS-232 Serial Cable (100 Foot) 28 AWG 25 Conductors
Best for long-distance DB25: 100 ft DB25 M/M cable with multi-conductor construction for extended RS232 links
RS-232 serial cable with 28 AWG conductors for DB25 to DB25 connections. RoHS compliant for environmentally responsible use. customer insight notes no specific comments available
- dc25-to-dc25 rs-232 compatibility
- rohs compliant
- long 100 ft length
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10
DB9 male to female RS232 extension cable, 12 ft
Best for long extensions: DB9 M-to-F 12 ft extension with durable construction for desk-to-device connectivity
DB9 male to female RS232 extension cable with 24 AWG copper conductors and grey PVC jacket. Provides flexible placement for peripherals and supports straight-through wiring. Customer insight: mentions practical extension for multiple monitor setups
- metal housings with thumbscrews
- straight-through wiring
- DB9 to DB9 extension for RS-232