MAX4889B, MAX4889C

2.5/5.0/8.0Gbps PCIe Passive Switch

High-Speed PCI Express Passive Switches Enable Gen II Switching with Low Insertion Loss and Superior Return Loss
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Status Explanations for product status codes

Active: In Production.


The MAX4889B/MAX4889C high-speed passive switches route PCI Express® (PCIe) data between two possible destinations in desktop or notebook PCs. The MAX4889B/MAX4889C are quad double-pole/double-throw (4 x DPDT) switches ideal for switching four half lanes of PCIe data between two destinations. The MAX4889B/MAX4889C feature a single digital control input (SEL) to switch signal paths.

The MAX4889C is intended for use in systems (e.g., SAS) where both the input and output are capacitively coupled, and provides a 10µA (typ) source current and a 60kΩ (typ) internal biasing resistor to GND at the _OUT_ terminals.

The MAX4889B/MAX4889C are fully specified to operate from a single +3.3V (typ) power supply. Both devices are available in an industry-standard 3.5mm x 9.0mm, 42-pin TQFN package. These devices operate over the -40°C to +85°C extended temperature range.

Data Sheet

Download this datasheet in PDF formatDownload Rev 2 (PDF, 208kB)
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An evaluation board is available: MAX4889BEVKIT

Key Features

  • Single +3.3V Power-Supply Voltage
  • Support PCIe Gen I, Gen II, and Gen III Data Rates
  • Supports SAS I, SAS II, and SAS 6.0Gbps (MAX4889C)
  • Superior Return Loss
    • Better than -22dB (typ) at 4.0GHz
  • Excellent Return Loss
    • Better than -1.2dB (typ) at 4.0GHz
  • Small 3.5mm x 9.0mm, 42-Pin TQFN Package
  • Industry-Standard Pinouts


  • Desktop PCs
  • Notebook PCs
  • Servers
  • Video Graphics Cards—SLI® (Scaled Link Interface) and CrossFire™

Key Specifications:

Switches and Multiplexers (Low Voltage)
Part Number Protocol Config. Channels VSUPPLY (Single)
VSUPPLY (Single)
Dynamic Range (max)
min max min max max max typ max See Notes
MAX4889B  PCIe 2-to-1 8 3 3.6 0 1.8 1.8 8.4 0.3 5000 1000 $2.92 @1k
MAX4889C  SAS 6000 $2.98 @1k
See All Switches and Multiplexers (Low Voltage) (184)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX4889B, MAX4889C: Functional Diagram
Functional Diagram

More Information

New Product Press Release   2008-09-11 ]

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Information Index

Document Ref.: 19-4148 Rev 2; 2010-09-01
This page last modified: 2011-08-15