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PCA9546A from TI,Texas Instruments

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PCA9546A

Manufacturer: TI, PH

4-channel I²C switch with reset

Partnumber Manufacturer Quantity Availability
PCA9546A TI, PH 890 In Stock

Description and Introduction

4-channel I²C switch with reset The **PCA9546A** from Texas Instruments is a versatile 4-channel I²C/SMBus multiplexer designed to enable communication between a single master device and multiple downstream I²C bus segments. By providing selectable channel control, this component simplifies system design in applications requiring multiple I²C devices with identical addresses, reducing address conflicts and improving bus efficiency.  

Featuring a low on-state resistance and support for standard (100 kHz) and fast-mode (400 kHz) I²C operations, the PCA9546A ensures reliable signal integrity across all channels. Its bidirectional voltage-level translation capability allows seamless interfacing between devices operating at different logic levels, making it suitable for mixed-voltage systems.  

The device includes an interrupt input for each channel, enabling efficient monitoring of downstream peripherals. Additionally, its power-up state ensures all channels remain deselected, preventing unintended bus contention during initialization. With a compact package and robust ESD protection, the PCA9546A is well-suited for industrial, automotive, and consumer electronics applications where I²C expansion and isolation are critical.  

Engineers benefit from its straightforward control via I²C commands, simplifying integration into complex multi-bus architectures while maintaining system reliability and performance.

Application Scenarios & Design Considerations

4-channel I²C switch with reset

Alternative Part Number

  • TCA9546A --: Pin-compatible 4-channel I2C switch from TI's TCA series with the same address and channel-select functionality, often used as a direct drop-in replacement.
  • PCA9546APW --: Original NXP 4-channel I2C multiplexer that the TI PCA9546A is based on, with identical register map and I2C switching behavior.
  • TCA9545A --: Similar TI 4-channel I2C switch with interrupt logic; usable when interrupt support is needed, though pinout and register details should be verified.
  • TCA9546APWR --: TSSOP-packaged version of the TI equivalent, offering matching electrical characteristics and I2C switching behavior.

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