Diodes Incorporated
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PI2USB4122 (Not Recommended for New Design (NRND))

NRND = Not Recommended for New Design

1.8V USB 3.2 Gen 1, 4:1 Mux/DeMUx

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Product Description

The PI2USB4122 is a 4 to 1 differential channel multiplexer/demultiplexer switch. Due to its low bit-tobit skew, high channel-to-channel noise isolation and high bandwidth, this product is ideal for USB 3.2 Gen 1 switching to 5.0 Gbps.


  • 2 Differential Channel, 4:1 Mux/DeMux
  • PCI Express® 2.0 performance, 5.0 Gbps
  • Low Bit-to-Bit Skew, 7ps Max.
  • Low Crosstalk: -23dB@3GHz
  • Low Off Isolation: -23dB@3GHz
  • VDD Operating Range: +1.8V+/-10%
  • ESD Tolerance 2kV HBM on data I/O
  • Packaging (Pb-free & Green): – 42 contact TQFN


  • Switching USB 3.2 Gen 1 signals for Mux or DeMux.

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Configuration USB 3.2 Gen 1
Differential Channels 4
HotInsertion 0
Lanes N/A
OtherFeatures N/A
Rail-to-Rail 0
Signal Type Differential
Single Ended Channels N/A
Type 4:01
Voltage 1.8

Technical Documents

Design tool model software

Recommended Soldering Techniques


Additional Technical Documents are available upon request: 
Application information, Evaluation board, and Other technical documents

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2672 2024-03-11 2024-09-07 Device End of Life (EOL)
PCN-2328 2018-04-12 2018-10-12 Device End of Life for tray packaging only