TCA6408A-Q1 Automotive Low-Voltage 8-Bit I2C and SMBus I/O Expander With Interrupt Output |

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Automotive Low-Voltage 8-Bit I2C and SMBus I/O Expander With Interrupt Output



The TCA6408A-Q1 is a 16-pin device that provides 8-bits of general purpose parallel input and output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus) protocol. This device can operate with a power supply voltage ranging from 1.65 V to 3.6 V on both the I2C bus side (VCCI) and on the P-port side (VCCP). This allows the TCA6408A-Q1 to interface with next-generation microprocessors and microcontrollers on the SDA/SCL side, where supply levels are dropping down to conserve power. In contrast to the dropping power supplies of microprocessors and microcontrollers, some PCB components such as LEDs remain at a higher power supply.

The device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. I/O expanders such as the TCA6408A-Q1 provide a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and so forth.


  • I2C to Parallel Port Expander
  • Operating Power-Supply Voltage Range of 1.65 V to 3.6 V
  • Allows Bidirectional Voltage-Level Translation and GPIO Expansion Between 1.8-, 2.5-, and 3.3-V I2C Bus and P-Ports
  • Low Standby Current Consumption
  • 400-kHz Fast I2C Bus
  • Hardware Address Pin Allows Two TCA6408A-Q1 Devices on the Same I2C/SMBus Bus
  • Active-Low Reset (RESET) Input
  • Open-Drain Active-Low Interrupt (INT) Output
  • Input and Output Configuration Register
  • Polarity Inversion Register
  • Internal Power-On Reset
  • Power Up With All Channels Configured as Inputs
  • No Glitch On Power Up
  • Noise Filter on SCL/SDA Inputs
  • Latched Outputs With High-Current Drive Maximum Capability for Directly Driving LEDs
  • Latch-Up Performance meets 100 mA Per AEC Q100-004
  • Schmitt-Trigger Action Allows Slow Input Transition and Better Switching Noise Immunity at the SCL and SDA Inputs
  • ESD Protection
    • 2000-V Human Body Model (Q100-002)
    • 1000-V Charged-Device Model (Q100-011)


Compare all products in I2C general-purpose I/Os (GPIOs) Email Download to Excel
Part number Order Number of I/Os VCC (Min) (V) VCC (Max) (V) Frequency (Max) (kHz) Features Addresses Rating Operating temperature range (C) Package Group
TCA6408A-Q1 Order now 8     1.65     3.6     400     Adjustable I/O level
Configuration registers
Interrupt pin
Reset pin    
2     Automotive     -40 to 125     TSSOP | 16    
TCA9539-Q1 Order now 16     1.65     3.6     400     Configuration registers
Interrupt pin
Reset pin    
4     Automotive     -40 to 125     TSSOP | 24