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Nexperia NCA9548A 8-Channel I²C Bus Switches

Nexperia NCA9548A 8-Channel I2C Bus Switches are octal bidirectional translating switches controlled through the I2C bus. The SCL/SDA upstream pair spreads to eight downstream pairs, or channels. The contents of the programmable control register decide whether an individual SCn/SDn channel or a mixture of channels can be selected. An active LOW reset input enables the Nexperia NCA9548A to recover from a condition in which one of the downstream I2C buses is stuck LOW. Pulling the RESET pin LOW resets the I2C bus state machine and deselects all channels, as does the internal power-on reset function.

The switch pass gates include a VCC pin, which can be used to limit the maximum high voltage the NCA9548A will pass. This feature allows different bus voltages on each pair, so that 1.8V, 2.5V, or 3.3V parts can communicate with 5V parts without additional protection. The external pull-up resistors increase the desired voltage level for each channel. The I/O pins are 6V tolerant.

Features

  • 1-of-8 bidirectional translating switches
  • I2C bus interface logic; compatible with SMBus standards
  • Active LOW reset input
  • 3 address pins allow up to 8 devices on I2C bus
  • Channel selection via the I2C bus, in any combination
  • Power up with all switch channels deselected
  • Low Ron switches
  • Allows voltage level translation between 1.8V, 2.5V, 3.3V, and 5V buses
  • No glitch on power-up
  • Supports hot insertion
  • Low standby current
  • Operating power supply voltage range of 1.65V to 5.5V
  • 6V-tolerant inputs
  • 0Hz to 400kHz clock frequency
  • Latch-up testing is done to JEDEC Standard JESD78, which exceeds 100mA
  • ESD protection
    • HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2kV
    • CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1kV
  • TSSOP24 or HWQFN24 package
  • Specified from -40°C to +85°C and from -40°C to +125°C

Applications

  • Battery-powered devices
    • Sensors
    • Keypads
    • Push buttons
    • LED control for managing LED brightness

Videos

Simplified Application

Application Circuit Diagram - Nexperia NCA9548A 8-Channel I²C Bus Switches

Block diagram

Block Diagram - Nexperia NCA9548A 8-Channel I²C Bus Switches

Associated Products

Nexperia NCA9547A 8-Channel I²C Bus Multiplexers

Octal bidirectional translating devices managed by the I2C bus.

Learn Moreabout Nexperia NCA9547A 8-Channel I²C Bus Multiplexers View Productsrelated to Nexperia NCA9547A 8-Channel I²C Bus Multiplexers

Nexperia NCA6416 Low-Voltage 16-Bit I/O Expanders

Developed for microcontrollers that require additional I/O pins.

Learn Moreabout Nexperia NCA6416 Low-Voltage 16-Bit I/O Expanders View Productsrelated to Nexperia NCA6416 Low-Voltage 16-Bit I/O Expanders
Published: 2025-09-24 | Updated: 2026-09-16