![StarTech.com 1-port PCI Express RS232 Serial Adapter Card, PCIe to DB9, 16550 UART, Window/Linux,TAA - [New Version: PEX1S953LP]](https://specpicks.com/og-image.png)
StarTech
.com 1-port PCI Express RS232 Serial Adapter Card, PCIe to DB9, 16550 UART, Window/Linux,TAA - [New Version: PEX1S953LP]
*Price sourced from Amazon.com. Last updated 2026-05-23. Price and availability subject to change.
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…
SpecPicks Verdict
SpecPicks classifies StarTech.com 1-port PCI Express RS232 Serial Adapter Card, PCIe to… as a solid pick with broad community endorsement in the expansion cards category, based on 110 verified Amazon reviews and our ranking model that weights rating × review-volume × price-fit. StarTech's positioning sits comfortably above the category median. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.
Common buyer scenarios for expansion cards of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.
Pros & Cons
Pros
- ✓ Solid 4.4★ customer rating
- ✓ NEW VERSION AVAILABLE: PEX1S953LP
- ✓ Backed by StarTech's warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified
Key Features
- NEW VERSION AVAILABLE: PEX1S953LP
- 1 PORT SERIAL CARD: Serial controller card w/ 16550 UART based on ASIX MCS9922CV-AA, allows 1x DB9 port w/bi-directional RS232 speeds up to 460.8Kbps per port, available 256 byte FIFO buffer
- OPTIONAL CONFIGURABLE POWER: PCI Express RS232 serial adapter card provides choice of 12v, 5v, or none through pin 9
- STANDARD PROFILE & LOW PROFILE BRACKET: PCIe serial card comes w/ a low profile bracket pre-installed & 1x full profile bracket is incl for versatile install; Supports Windows & Linux
- VERSATILE APPLICATIONS: For low/standard profile desktop/servers w/ uses in point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanner, oscilloscope
Full Specifications
| Brand | StarTech.com |
|---|---|
| Style | 1 Port |
| Style Name | 1 Port |
| Model Number | PEX1S553LP |
| Compatibility | Linux |
| Mfr Part Number | PEX1S553LP |
| Operating System | Windows 7 |
| Compatible Devices | Personal Computer |
| Hardware Interface | PCI |
| Warranty Description | 2-Year |
| NEW VERSION AVAILABLE | PEX1S953LP |
| Item Dimensions L x W x H | 4.1"L x 3.1"W x 0.8"H |
| OPTIONAL CONFIGURABLE POWER | PCI Express RS232 serial adapter card provides choice of 12v, 5v, or none through pin 9 |
| Global Trade Identification Number | 00065030841733, 00065030841955 |
Ready to buy?
StarTech.com 1-port PCI Express RS232 Serial Adapter Card, PCIe to DB9, 16550 UART, Window/Linux,TAA - [New Version: PEX1S953LP] is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-05-23. Price and availability subject to change.
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