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8-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt & config registers

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TCA9534PWR General Description

The TCA9534PWR is part of Texas Instruments' family of I2C-bus I/O expanders. It provides additional digital I/O pins that can be controlled and monitored via the I2C communication protocol. This device is particularly useful when the number of available GPIO pins on a microcontroller is limited.

tca9534pwr TCA9534PWR

Key Features

  • ESD Protection Exceeds JESD 22
    • 2000-V Human-Body Model (A114-A)
    • 1000-V Charged-Device Model (C101)
  • Low Standby Current Consumption
  • IC to Parallel Port Expander
  • Open-Drain Active-Low Interrupt Output
  • Operating Power-Supply Voltage Range of 1.65 V to 5.5 V
  • 5-V Tolerant I/O Ports
  • 400-kHz Fast IC Bus
  • Three Hardware Address Pins Allow up to Eight Devices on the IC/SMBus
  • 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 Exceeds 100 mA Per JESD 78, Class II


  • Microcontroller I/O Expansion: Extending the number of available I/O pins on microcontrollers that have limited GPIO resources.
  • Keypad Scanning: Simplifying the interface with keypads and matrix switches.
  • LED Control: Controlling multiple LEDs individually or in patterns.
  • Digital Sensors: Connecting and monitoring digital sensors or switches.
  • Signal Multiplexing: Enabling signal multiplexing and selection in instrumentation and data acquisition systems.
  • System Monitoring: Reading and monitoring digital signals from various parts of a system.
  • Remote Control: Implementing remote control functions with digital I/O.
  • Industrial Automation: Utilizing digital I/O for controlling and monitoring industrial equipment.


Category Integrated Circuits (ICs)InterfaceI/O Expanders Mfr Texas Instruments
Series - Package Tape & Reel (TR)Cut Tape (CT)Digi-Reel®
Product Status Active Digi-Key Programmable Not Verified
Number of I/O 8 Interface I²C
Interrupt Output Yes Features -
Output Type Push-Pull Current - Output Source/Sink 10mA, 25mA
Clock Frequency 400 kHz Voltage - Supply 1.65V ~ 5.5V
Operating Temperature -40°C ~ 85°C Mounting Type Surface Mount
Package / Case 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package 16-TSSOP
Base Product Number TCA9534 Number of I/Os 8
Supply voltage (min) (V) 1.65 Supply voltage (max) (V) 5.5
Addresses 8 Rating Catalog
Frequency (max) (MHz) 0.4 Operating temperature range (°C) -40 to 85

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Ratings and Reviews

F**l 02/04/2023

Number and nominal correspond

M**n 11/14/2021

Half of the text was mirrored...

J**h 05/12/2020

Everything has come, i will add...



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Availability: 5150 PCS

Qty. Unit Price(USD) Ext. Price
1+ $0.996 $1.00
10+ $0.850 $8.50
30+ $0.769 $23.07
100+ $0.677 $67.70
500+ $0.563 $281.50
1000+ $0.546 $546.00

The prices below are for reference only.