Buffered Four-Channel Two-Wire Bus Switch

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Block diagram of PCA9646

Block diagram of PCA9646


  • Drop-in pin compatible with PCA9546A, etc.
  • Each I/O is impedance isolated from all others allowing maximum capacitance on all branches
  • 30 mA static sink capability on all ports
  • Works with I²C-bus (Standard-mode, Fast-mode, and Fast-mode Plus (Fm+)), SMBus (standard and high power mode), and PMBus
  • Fast switching times allow operation in excess of 1 MHz
  • Allows driving of large loads (e.g., 5 × 4 nF)
  • Hysteresis on I/O increases noise immunity
  • Operating voltages from 2.7 V to 5.5 V
  • Uncomplicated characteristics suitable for quick implementation in most common 2-wire bus applications
  • ESD protection exceeds 2000 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


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Design Resources

Design Files

2 design files

  • Models

    PCA9646PW IBIS Model

  • Symbols and Footprints

    PCA9646PW-TSSOP16-CAD Symbol and PCB Footprint – BXL File


2 hardware offerings

Engineering Services

2 engineering services

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