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Parallel I/O Port, 24 I/O, CMOS, PQCC32

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PCAL6524HEAZ General Description

The PCAL6524 is a 24-bit general purpose I/O expander that provides remote I/O expansion for most microcontroller families via the Fast-mode Plus (Fm+) I2C-bus interface. The ultra low-voltage interface allows for direct connection to a microcontroller operating down to 0.8 V.

NXP Semiconductor Inventory

Key Features

 1 MHz Fast-mode Plus I2C-bus
 Operating power supply voltage range of 0.8 V to 3.6 V on the I2C-bus side
 Allows bidirectional voltage-level translation and GPIO expansion between 0.8 V to 3.6 V SCL/SDA and 1.8 V, 2.5 V, 3.3 V, 5.5 V Port P
 Low standby current consumption: 2.0 A typical at 3.3 V VDD(P)
 Schmitt trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs
 Vhys = 0.05 V (typical) at 0.8 V
 Vhys = 0.18 V (typical) at 1.8 V
 Vhys = 0.33 V (typical) at 3.3 V
 5.5 V tolerant I/O ports and 3.6 V tolerant I2C-bus pins
 Active LOW reset input (RESET)
 Open-drain active LOW interrupt output (INT)
 Internal power-on reset
 Noise filter on SCL/SDA inputs
 Latched outputs with 25 mA drive maximum capability for directly driving LEDs
 Latch-up performance exceeds 100 mA per JESD 78, Class II
 ESD protection exceeds JESD 22
 2000 V Human-Body Model (A114-A)
 1000 V Charged-Device Model (C101)
 Packages offered: HUQFN32, VFBGA36

NXP Semiconductor Original Stock


  • Embedded Systems: Used to expand the number of available GPIO pins on microcontrollers, particularly in applications with limited pins.
  • Human-Machine Interfaces (HMI): In HMI devices like touchscreens and keypads where additional GPIO pins are required for user input.
  • Sensor Interfaces: To interface with multiple sensors and collect data through digital input pins.
  • LED Control: Managing and controlling LED displays or indicators with limited GPIO pins.
  • Automotive Electronics: In automotive applications for interfacing with various sensors, switches, and displays.
  • Industrial Automation: Used in industrial control systems, PLCs (Programmable Logic Controllers), and other automation equipment to expand digital I/O capabilities.
  • Consumer Electronics: In consumer devices that require additional GPIO pins for external connections or user interfaces.
NXP Semiconductor Inventory


Category Integrated Circuits (ICs)InterfaceI/O Expanders Mfr NXP USA Inc.
Series - Package Tape & Reel (TR)Cut Tape (CT)Digi-Reel®
Product Status Active Digi-Key Programmable Not Verified
Number of I/O 24 Interface I²C
Interrupt Output Yes Features POR
Output Type Open Drain, Push-Pull Current - Output Source/Sink -
Clock Frequency 1 MHz Voltage - Supply 1.65V ~ 5.5V
Operating Temperature -40°C ~ 85°C Mounting Type Surface Mount
Package / Case 32-UFQFN Exposed Pad Supplier Device Package 32-HUQFN (5x5)
Base Product Number PCAL6524 Manufacturer NXP
Product Category Interface - I/O Expanders RoHS Details
Mounting Style SMD/SMT Interface Type I2C, Serial, SMBus
Number of I/Os 24 I/O Supply Voltage - Min 800 mV
Supply Voltage - Max 3.6 V Maximum Clock Frequency 1 MHz
Minimum Operating Temperature - 40 C Maximum Operating Temperature + 85 C
ESD Protection 2 kV Brand NXP Semiconductors
Logic Family PCAL6524 Operating Supply Current 200 mA
Operating Supply Voltage 800 mV to 3.6 V Output Current 25 mA
Product I/O Expanders Product Type I/O Expanders
Factory Pack Quantity 500 Subcategory Interface ICs
Type General Purpose Part # Aliases 935305331147
Unit Weight 0.001444 oz

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Ratings and Reviews

Z**y 02/04/2024

Received in 19 days. Good quality. Brightness is good.

v**n 07/09/2022

faster than expected

A**n 01/15/2022

49 of the ordered 50

A**r 05/07/2020

Thank you for receiving the product well today and sending it quickly.



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PCAL6524HEAZ Datasheet PDF

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