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

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The DIODES™ PI4MSD5V9548A is an octal bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to eight 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 PI4MSD5V9548A 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 state machine and causes all the channels to be deselected as does the internal Power-on reset function.

The pass gates of the switches are constructed such that the VCC pin can be used to limit the maximum high voltage which will be passed by the PI4MSD5V9548A. 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 5 V 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 5 V tolerant.


  • 1-of-8 Bidirectional Translating Switch
  • I2C-bus Interface Logic
  • Operating Power Supply Voltage from 1.65V to 5.5V
  • Allows Voltage Level Translation between 1.2V, 1.8V, 2.5V, 3.3V and 5V buses
  • Low Standby Current
  • Low Ron Switches
  • Active LOW Reset Input
  • Channel Selection via I2C bus
  • Power-up with all switches channels deselected
  • Capacitance Isolation when channels el disabled
  • No Glitch on power-up
  • Supports hot insertion
  • 5V Tolerant Inputs
  • 0Hz to 400kHz Clock Frequency
  • ESD protection exceeds 8000 V HBM per JESD22-A114, and 1000 V 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 available):
    。 24-Pin, TSSOP (L)
    。 24-Pin, TQFN (ZD)

Product Specifications

Product Parameters

Ambient or Junction Temperature (°C) -40 to 85
Analog or Digital? Digital
Voltage 1.65V/5.5V
Single Ended Channels 8
Signal Type Single Ended
Configuration Switch, 8-channel, 8:1
RailToRail 0
HotInsertion 1

Technical Documents

Recommended Soldering Techniques


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

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