Diodes Incorporated
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4-Channel I2C/SMBus Bus Switch with RESET

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The PI4MSD5V9546A is a quad bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register.

An active LOW reset input allows the PI4MSD5V9546A to recover from a situation where one of the downstream buses is stuck in a LOW state. Pulling the RESET pin LOW resets the I2C bus stat machine and cause all the channels to be deselected as does the internal Power-On Reset (POR) function.

The pass gates of the switches are constructed such that the VCC pin can be used to limit the maximum high voltage which is passed by the PI4MSD5V9546A. This allows the use of different bus voltages on each pair, so that 1.2V, 1.8V or 2.5V or 3.3V parts can communicate with 5V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5V tolerant.


  • 1-of-4 Bidirectional Translating Multiplexer
  • I2C-bus Interface Logic
  • Operating Power Supply Voltage: 1.65V to 5.5V
  • Allows Voltage Level Translation between 1.2V, 1.8V, 2.5, 3.3V and 5V Buses
  • Low Standby Current
  • Low Ron Switches
  • Channel Selection via I2C bus
  • Power-up with all Multiplexer Channels Deselected
  • Capacitance Isolation when Channel Disabled
  • No Glitch on Power0up
  • Supports Hot Insertion
  • 5V Tolerant Inputs
  • 0 Hz to 400 kHz Clock Frequency
  • ESD Protection exceeds 8000V HBM per JESD22-A114, and 1000V CDM per JESD22-C101
  • Latch-up Testing is done to JEDEC Standard JESD78 which exceeds 100 mA
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. "Green" Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/
  • Packaging (Pb-free & Green):
    • 16-Pin, TSSOP (L)
    • 16-Pin, 4mmx4mm, TQFN (ZY)

Product Specifications

Product Parameters

Ambient or Junction Temperature (°C) -40 to 85
Analog or Digital? Digital
Voltage 1.65V/5.5V
Single Ended Channels 4
Signal Type Single Ended
Configuration Switch, 4-channel, 2:1
Rail-to-Rail 0
HotInsertion 1

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-2493 2020-12-28 2021-03-28 Qualified Additional A/T Sites and Bill of Materials (BOM)