Diodes Incorporated
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PI3L720 (Not Recommended for New Design (NRND))

NRND = Not Recommended for New Design

3.3V, 16-Bit to 8-Bit, Mux / DeMux Gigabit Ethernet LAN Switch (Single Enable) with LED Switching and Enhanced ESD Protection with Power Down Mode

NOTE: Datasheet may not yet reflect updated package obsolescence/phase out status or Package Drawing. Please refer to the BUY NOW tab for the most up to date package options and drawings. Please refer to PCN/PDN tabs for most current package obsolescence/phase out status.
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Product Description

The PI3L720 is a 8-Channel 2:1 multiplexer/demultiplexer LAN Switch with Hi-Z outputs. Industry leading advantages include a propagation delay of less than 250ps, resulting from its low channel resistance and I/O capacitance. The device multiplexes differential outputs from a Gigabit Ethernet transceiver (PHY) device to one of two corresponding B or C outputs. The switch is bidirectional and offers little or no attenuation of the high-speed signals at the outputs. It is designed for low bit-to-bit skew, high channel-tochannel noise isolation and is compatible with various standards, such as 10/100/1000 Base-T (Ethernet). The PI3L720 provides a Power Down input (PD), which can put the device into standby mode (PD=1) while mobile, eliminating an external power switch. Generally, this part can be used to replace mechanical relays in low-voltage LAN applications that interface a physical layer over CAT 5 or CAT 6 unshielded twisted pair cable through an isolation transformer.


  • 1:2 Gigabit LAN Switch
  • Power-down support
  • Low bit-to-bit skew: 200ps
  • Very Low Crosstalk: –75dB @ 250MHz
  • Status Indicator LEDs Switched with Ethernet pairs
  • VDD Operating Range: +3.0V to +3.6V
  • Enhanced ESD Protection (on A, B, C, LED pins):
    • 8kV (contact)(1
    • 1.0kV (machine model), 11kV (human body model)
  • >650 MHz bandwidth
  • Packaging:
    • 56-contact TQFN (5 x 11mm, 0.5 pitch)
    • 42-contact TQFN (3.5 x 9mm, 0.5 pitch)
    • 42-contact TQFN (3.5 x 7mm, 0.4 pitch)


  • Dual Physical Layer Device sharing to one interface connector, or one controller to dual connectors for docking
  • Routes signals for 10/100/1000 Mbit Ethernet

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Configuration Mux: Quad 4-Channel
Differential Channels 8
HotInsertion 0
Lanes N/A
OtherFeatures N/A
RailToRail 0
Signal Type Differential
Single Ended Channels N/A
Voltage 3

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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-2642 2023-09-05 2024-03-05 Device End of Life (EOL)
PCN-2328 2018-04-12 2018-10-12 Device End of Life for tray packaging only


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