STARTECH 

PEX1S553LP StarTech.com 1 Port Low Profile Native RS232 PCI Express Serial Card with 16550 UART

Mfg Part Number:  PEX1S553LP  
Image may not reflect the actual item.
Price: $54.99
Quantity:
More to Come
Last Updated: Nov 09, 2025
No Sales Tax except these states
, PO and Wire.

The PEX1S553LP PCI Express Serial Card turns a PCI Express slot into an RS232 (DB9) serial connection.

The card is constructed using a native single chip design that lets you harness the full capability offered by PCI Express (PCIe), while reducing the load applied to the CPU by as much as 48% over conventional bridge chip serial cards.

The PCI Express RS232 Serial Adapter Card is compatible with a broad range of operating systems, including Windows® and Linux Kernel 2.6.11 to 4.11.x, and ships with a low profile/half-height bracket installed, but includes an optional full profile bracket that lets you add a serial port to virtually any computer (regardless of the case form factor).

This product is a replacement for our PEX1S552LP card.

Backed by a StarTech.com 2-year warranty and free lifetime technical support.

More from the Manufacturer

More from the Manufacturer

Main Specification
General Information
Manufacturer StarTech.com
Manufacturer Part Number PEX1S553LP
Manufacturer Website Address http://www.startech.com
Brand Name StarTech.com
Product Model PEX1S553LP
Product Name 1 Port Low Profile Native RS232 PCI Express Serial Card with 16550 UART
Packaged Quantity 1
Product Type Serial Adapter
Technical Information
Host Interface PCI Express x1
Data Transfer Rate 460kB/s
UART Type 16550
Platform Supported Mac
Platform Supported PC
Platform Supported Linux
Interfaces/Ports
Number of Serial Ports (External) 1
Physical Characteristics
Form Factor Plug-in Card
Card Height Low-profile
Height 0.8"
Width 3.1"
Length 4.1"
Weight (Approximate) 1.60 oz
Miscellaneous
Package Contents
  • 1 Port Low Profile Native RS232 PCI Express Serial Card with 16550 UART
  • Full Profile Bracket
  • Driver CD
  • Instruction Manual
Additional Information
  • Native single-Chip, single lane PCI Express; 48% less cpu load, and increased performance.
  • Pre-configured for low profile/half-height systems but includes a full profile bracket for versatility.
  • Easy to install and use with full step-by-step instructions saving time and hassle.
  • Windows® 10 (32/64), 8 / 8.1 (32/64), 7 (32/64), Vista (32/64), XP (32/64), XP Embedded, POS Ready 2009, Embedded System 2009, CE 5.0/6.0, 2000, 98SE, 95, DOS
  • Windows Server® 2012, 2008 R2, 2003
  • Mac OS® 10.4 and later (tested up to 10.10)
  • Linux kernel 2.6.x
    • Environmentally Friendly Yes
    Country of Origin Taiwan
    TAA Compliant Yes
    Warranty
    Limited Warranty 2 Year
    product information
    WARNING:: The plastic used in cable products can expose you to lead and lead components, chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov
    [1024] [true] [Yes] [No] [No]